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Wachsmuth L, Hebbelmann L, Prade J, Kohnert LC, Lambers H, Lüttjohann A, Budde T, Hess A, Faber C. Epilepsy-related functional brain network alterations are already present at an early age in the GAERS rat model of genetic absence epilepsy. Front Neurol 2024; 15:1355862. [PMID: 38529038 PMCID: PMC10961455 DOI: 10.3389/fneur.2024.1355862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 02/16/2024] [Indexed: 03/27/2024] Open
Abstract
Introduction Genetic Absence Epilepsy Rats from Strasbourg (GAERS) represent a model of genetic generalized epilepsy. The present longitudinal study in GAERS and age-matched non-epileptic controls (NEC) aimed to characterize the epileptic brain network using two functional measures, resting state-functional magnetic resonance imaging (rs-fMRI) and manganese-enhanced MRI (MEMRI) combined with morphometry, and to investigate potential brain network alterations, following long-term seizure activity. Methods Repeated rs-fMRI measurements at 9.4 T between 3 and 8 months of age were combined with MEMRI at the final time point of the study. We used graph theory analysis to infer community structure and global and local network parameters from rs-fMRI data and compared them to brain region-wise manganese accumulation patterns and deformation-based morphometry (DBM). Results Functional connectivity (FC) was generally higher in GAERS when compared to NEC. Global network parameters and community structure were similar in NEC and GAERS, suggesting efficiently functioning networks in both strains. No progressive FC changes were observed in epileptic animals. Network-based statistics (NBS) revealed stronger FC within the cortical community, including regions of association and sensorimotor cortex, and with basal ganglia and limbic regions in GAERS, irrespective of age. Higher manganese accumulation in GAERS than in NEC was observed at 8 months of age, consistent with higher overall rs-FC, particularly in sensorimotor cortex and association cortex regions. Functional measures showed less similarity in subcortical regions. Whole brain volumes of 8 months-old GAERS were higher when compared to age-matched NEC, and DBM revealed increased volumes of several association and sensorimotor cortex regions and of the thalamus. Discussion rs-fMRI, MEMRI, and volumetric data collectively suggest the significance of cortical networks in GAERS, which correlates with an increased fronto-central connectivity in childhood absence epilepsy (CAE). Our findings also verify involvement of basal ganglia and limbic regions. Epilepsy-related network alterations are already present in juvenile animals. Consequently, this early condition seems to play a greater role in dynamic brain function than chronic absence seizures.
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Affiliation(s)
- Lydia Wachsmuth
- Clinic of Radiology, University of Münster, Münster, Germany
| | - Leo Hebbelmann
- Clinic of Radiology, University of Münster, Münster, Germany
| | - Jutta Prade
- Department of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Laura C. Kohnert
- Department of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | | | | | - Thomas Budde
- Institute of Physiology I, University of Münster, Münster, Germany
| | - Andreas Hess
- Department of Experimental and Clinical Pharmacology and Toxicology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
- Department of Neuroradiology, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
- FAU NeW – Research Center for New Bioactive Compounds, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Cornelius Faber
- Clinic of Radiology, University of Münster, Münster, Germany
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Vinnenberg L, Rychlik N, Oniani T, Williams B, White JA, Kovac S, Meuth SG, Budde T, Hundehege P. Assessing neuroprotective effects of diroximel fumarate and siponimod via modulation of pacemaker channels in an experimental model of remyelination. Exp Neurol 2024; 371:114572. [PMID: 37852467 DOI: 10.1016/j.expneurol.2023.114572] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 10/04/2023] [Accepted: 10/14/2023] [Indexed: 10/20/2023]
Abstract
Cuprizone (CPZ)-induced alterations in axonal myelination are associated with a period of neuronal hyperexcitability and increased activity of hyperpolarization-activated and cyclic nucleotide-gated (HCN) channels in the thalamocortical (TC) system. Substances used for the treatment of multiple sclerosis (MS) have been shown to normalize neuronal excitability in CPZ-treated mice. Therefore, we aimed to examine the effects of diroximel fumarate (DRF) and the sphingosine 1-phospate receptor (S1PR) modulator siponimod on action potential firing and the inward current (Ih) carried by HCN ion channels in naive conditions and during different stages of de- and remyelination. Here, DRF application reduced Ih current density in ex vivo patch clamp recordings from TC neurons of the ventrobasal thalamic complex (VB), thereby counteracting the increase of Ih during early remyelination. Siponimod reduced Ih in VB neurons under control conditions but had no effect in neurons of the auditory cortex (AU). Furthermore, siponimod increased and decreased AP firing properties of neurons in VB and AU, respectively. Computational modeling revealed that both DRF and siponimod influenced thalamic bursting during early remyelination by delaying the onset and decreasing the interburst frequency. Thus, substances used in MS treatment normalize excitability in the TC system by influencing AP firing and Ih.
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Affiliation(s)
- Laura Vinnenberg
- Department of Neurology with Institute of Translational Neurology, Münster University, Albert-Schweitzer-Campus 1, D-48149 Münster, Germany
| | - Nicole Rychlik
- Institute of Physiology I, Münster University, Robert-Koch-Str. 27a, D-48149 Münster, Germany.
| | - Tengiz Oniani
- Institute of Physiology I, Münster University, Robert-Koch-Str. 27a, D-48149 Münster, Germany
| | - Brandon Williams
- Department of Biomedical Engineering, Center for Systems Neuroscience, Neurophotonics Center, Boston University, 610 Commonwealth Ave, Boston MA-02215, USA
| | - John A White
- Department of Biomedical Engineering, Center for Systems Neuroscience, Neurophotonics Center, Boston University, 610 Commonwealth Ave, Boston MA-02215, USA
| | - Stjepana Kovac
- Department of Neurology with Institute of Translational Neurology, Münster University, Albert-Schweitzer-Campus 1, D-48149 Münster, Germany
| | - Sven G Meuth
- Neurology Clinic, Medical Faculty, University Clinic Düsseldorf, Moorenstraße 5, D-40225 Düsseldorf, Germany
| | - Thomas Budde
- Institute of Physiology I, Münster University, Robert-Koch-Str. 27a, D-48149 Münster, Germany
| | - Petra Hundehege
- Department of Neurology with Institute of Translational Neurology, Münster University, Albert-Schweitzer-Campus 1, D-48149 Münster, Germany
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Nelke C, Müntefering T, Cengiz D, Theissen L, Dobelmann V, Schroeter CB, Block H, Preuße C, Michels APE, Lichtenberg S, Pawlitzki M, Pfeuffer S, Huntemann N, Zarbock A, Briese T, Kittl C, Dittmayer C, Budde T, Lundberg IE, Stenzel W, Meuth SG, Ruck T. K 2P2.1 is a regulator of inflammatory cell responses in idiopathic inflammatory myopathies. J Autoimmun 2024; 142:103136. [PMID: 37935063 DOI: 10.1016/j.jaut.2023.103136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 10/12/2023] [Accepted: 10/18/2023] [Indexed: 11/09/2023]
Abstract
K2P2.1 (TREK1), a two-pore domain potassium channel, has emerged as regulator of leukocyte transmigration into the central nervous system. In the context of skeletal muscle, immune cell infiltration constitutes the pathogenic hallmark of idiopathic inflammatory myopathies (IIMs). However, the underlying mechanisms remain to be elucidated. In this study, we investigated the role of K2P2.1 in the autoimmune response of IIMs. We detected K2P2.1 expression in primary skeletal muscle and endothelial cells of murine and human origin. We observed an increased pro-inflammatory cell response, adhesion and transmigration by pharmacological blockade or genetic deletion of K2P2.1 in vitro and in in vivo myositis mouse models. Of note, our findings were not restricted to endothelial cells as skeletal muscle cells with impaired K2P2.1 function also demonstrated a strong pro-inflammatory response. Conversely, these features were abrogated by activation of K2P2.1 and improved the disease course of a myositis mouse model. In humans, K2P2.1 expression was diminished in IIM patients compared to non-diseased controls arguing for the translatability of our findings. In summary, K2P2.1 may regulate the inflammatory response of skeletal muscle. Further research is required to understand whether K2P2.1 could serve as novel therapeutic target.
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Affiliation(s)
- Christopher Nelke
- Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
| | - Thomas Müntefering
- Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
| | - Derya Cengiz
- Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany; Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Neuropathology, Berlin, Germany
| | - Lukas Theissen
- Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
| | - Vera Dobelmann
- Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
| | - Christina B Schroeter
- Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
| | - Helena Block
- Department of Anesthesiology, Intensive Care and Pain Medicine, University of Muenster, Muenster, Germany
| | - Corinna Preuße
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Neuropathology, Berlin, Germany
| | - Alexander P E Michels
- Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
| | - Stefanie Lichtenberg
- Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
| | - Marc Pawlitzki
- Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
| | | | - Niklas Huntemann
- Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
| | - Alexander Zarbock
- Department of Anesthesiology, Intensive Care and Pain Medicine, University of Muenster, Muenster, Germany
| | - Thorben Briese
- Department of Trauma, Hand and Reconstructive Surgery, Westphalian Wilhelms University Muenster, Muenster, Germany
| | - Christoph Kittl
- Department of Trauma, Hand and Reconstructive Surgery, Westphalian Wilhelms University Muenster, Muenster, Germany
| | - Carsten Dittmayer
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Neuropathology, Berlin, Germany
| | - Thomas Budde
- Institute of Physiology I, University of Muenster, Germany
| | - Ingrid E Lundberg
- Division of Rheumatology, Department of Medicine, Solna (MedS), K2, Karolinska Institutet, Stockholm, Sweden
| | - Werner Stenzel
- Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Neuropathology, Berlin, Germany
| | - Sven G Meuth
- Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany
| | - Tobias Ruck
- Department of Neurology, Medical Faculty, Heinrich-Heine-University, Duesseldorf, Germany.
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Ritter N, Disse P, Aymanns I, Mücher L, Schreiber JA, Brenker C, Strünker T, Schepmann D, Budde T, Strutz-Seebohm N, Ametamey SM, Wünsch B, Seebohm G. Downstream Allosteric Modulation of NMDA Receptors by 3-Benzazepine Derivatives. Mol Neurobiol 2023; 60:7238-7252. [PMID: 37542648 PMCID: PMC10657792 DOI: 10.1007/s12035-023-03526-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 07/20/2023] [Indexed: 08/07/2023]
Abstract
N-Methyl-D-aspartate receptors (NMDARs) composed of different splice variants display distinct pH sensitivities and are crucial for learning and memory, as well as for inflammatory or injury processes. Dysregulation of the NMDAR has been linked to diseases like Parkinson's, Alzheimer's, schizophrenia, and drug addiction. The development of selective receptor modulators, therefore, constitutes a promising approach for numerous therapeutical applications. Here, we identified (R)-OF-NB1 as a promising splice variant selective NMDAR antagonist. We investigated the interaction of (R)-OF-NB1 and NMDAR from a biochemical, bioinformatical, and electrophysiological perspective to characterize the downstream allosteric modulation of NMDAR by 3-benzazepine derivatives. The allosteric modulatory pathway starts at the ifenprodil binding pocket in the amino terminal domain and immobilizes the connecting α5-helix to the ligand binding domain, resulting in inhibition. In contrast, the exon 5 splice variant GluN1-1b elevates the NMDARs flexibility and promotes the open state of its ligand binding domain.
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Affiliation(s)
- Nadine Ritter
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany.
- Chembion, University of Münster, 48149, Münster, Germany.
| | - Paul Disse
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany
- Chembion, University of Münster, 48149, Münster, Germany
| | - Isabel Aymanns
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany
| | - Lena Mücher
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany
| | - Julian A Schreiber
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany
- Institute of Pharmaceutical and Medicinal Chemistry, University of Münster, Corrensstr. 48, 48149, Münster, Germany
| | - Christoph Brenker
- Centre of Reproductive Medicine and Andrology, University Hospital Münster, University of Münster, Domagkstr. 11, 48149, Münster, Germany
| | - Timo Strünker
- Chembion, University of Münster, 48149, Münster, Germany
- Centre of Reproductive Medicine and Andrology, University Hospital Münster, University of Münster, Domagkstr. 11, 48149, Münster, Germany
| | - Dirk Schepmann
- Institute of Pharmaceutical and Medicinal Chemistry, University of Münster, Corrensstr. 48, 48149, Münster, Germany
| | - Thomas Budde
- Institute of Physiology I, University of Münster, 48149, Münster, Germany
| | - Nathalie Strutz-Seebohm
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany
| | - Simon M Ametamey
- Institute of Pharmaceutical Sciences, ETH Zürich, Zürich, Switzerland
| | - Bernhard Wünsch
- Chembion, University of Münster, 48149, Münster, Germany
- Institute of Pharmaceutical and Medicinal Chemistry, University of Münster, Corrensstr. 48, 48149, Münster, Germany
| | - Guiscard Seebohm
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany
- Chembion, University of Münster, 48149, Münster, Germany
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5
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Kapell H, Fazio L, Dyckow J, Schwarz S, Cruz-Herranz A, Mayer C, Campos J, D’Este E, Möbius W, Cordano C, Pröbstel AK, Gharagozloo M, Zulji A, Narayanan Naik V, Delank A, Cerina M, Müntefering T, Lerma-Martin C, Sonner JK, Sin JH, Disse P, Rychlik N, Sabeur K, Chavali M, Srivastava R, Heidenreich M, Fitzgerald KC, Seebohm G, Stadelmann C, Hemmer B, Platten M, Jentsch TJ, Engelhardt M, Budde T, Nave KA, Calabresi PA, Friese MA, Green AJ, Acuna C, Rowitch DH, Meuth SG, Schirmer L. Neuron-oligodendrocyte potassium shuttling at nodes of Ranvier protects against inflammatory demyelination. J Clin Invest 2023; 133:e164223. [PMID: 36719741 PMCID: PMC10065072 DOI: 10.1172/jci164223] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 01/27/2023] [Indexed: 02/01/2023] Open
Abstract
Multiple sclerosis (MS) is a progressive inflammatory demyelinating disease of the CNS. Increasing evidence suggests that vulnerable neurons in MS exhibit fatal metabolic exhaustion over time, a phenomenon hypothesized to be caused by chronic hyperexcitability. Axonal Kv7 (outward-rectifying) and oligodendroglial Kir4.1 (inward-rectifying) potassium channels have important roles in regulating neuronal excitability at and around the nodes of Ranvier. Here, we studied the spatial and functional relationship between neuronal Kv7 and oligodendroglial Kir4.1 channels and assessed the transcriptional and functional signatures of cortical and retinal projection neurons under physiological and inflammatory demyelinating conditions. We found that both channels became dysregulated in MS and experimental autoimmune encephalomyelitis (EAE), with Kir4.1 channels being chronically downregulated and Kv7 channel subunits being transiently upregulated during inflammatory demyelination. Further, we observed that pharmacological Kv7 channel opening with retigabine reduced neuronal hyperexcitability in human and EAE neurons, improved clinical EAE signs, and rescued neuronal pathology in oligodendrocyte-Kir4.1-deficient (OL-Kir4.1-deficient) mice. In summary, our findings indicate that neuron-OL compensatory interactions promoted resilience through Kv7 and Kir4.1 channels and identify pharmacological activation of nodal Kv7 channels as a neuroprotective strategy against inflammatory demyelination.
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Affiliation(s)
- Hannah Kapell
- Department of Neurology, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
| | - Luca Fazio
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster (UKM), Münster, Germany
- Department of Neurology, University of Düsseldorf, Dusseldorf, Germany
| | - Julia Dyckow
- Department of Neurology, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
| | - Sophia Schwarz
- Department of Neurology, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
| | - Andrés Cruz-Herranz
- Weill Institute for Neurosciences, Department of Neurology, UCSF, San Francisco, California, USA
| | - Christina Mayer
- Institute of Neuroimmunology and Multiple Sclerosis, Center for Molecular Neurobiology Hamburg, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Joaquin Campos
- Chica and Heinz Schaller Research Group, Institute of Anatomy and Cell Biology, Heidelberg University, Heidelberg, Germany
| | - Elisa D’Este
- Optical Microscopy Facility, Max Planck Institute for Medical Research, Heidelberg, Germany
| | - Wiebke Möbius
- Electron Microscopy Core Unit, Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany
- Cluster of Excellence, “Multiscale Bioimaging: from Molecular Machines to Network of Excitable Cells” (MBExC), University of Göttingen, Göttingen, Germany
| | - Christian Cordano
- Weill Institute for Neurosciences, Department of Neurology, UCSF, San Francisco, California, USA
| | - Anne-Katrin Pröbstel
- Weill Institute for Neurosciences, Department of Neurology, UCSF, San Francisco, California, USA
- Neurologic Clinic and Policlinic and Research Center for Clinical Neuroimmunology and Neuroscience Basel, Departments of Medicine, Biomedicine, and Clinical Research, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Marjan Gharagozloo
- Departments of Neurology and Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Amel Zulji
- Department of Neurology, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
| | - Venu Narayanan Naik
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster (UKM), Münster, Germany
| | - Anna Delank
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster (UKM), Münster, Germany
| | - Manuela Cerina
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster (UKM), Münster, Germany
| | | | - Celia Lerma-Martin
- Department of Neurology, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
| | - Jana K. Sonner
- Chica and Heinz Schaller Research Group, Institute of Anatomy and Cell Biology, Heidelberg University, Heidelberg, Germany
| | - Jung Hyung Sin
- Weill Institute for Neurosciences, Department of Neurology, UCSF, San Francisco, California, USA
| | - Paul Disse
- Institute for Genetics of Heart Diseases (IfGH), Cellular Electrophysiology and Molecular Biology, UKM, Münster, Germany
- University of Münster, Chembion, Münster, Germany
| | - Nicole Rychlik
- University of Münster, Chembion, Münster, Germany
- Institute of Physiology I, University of Münster, Münster, Germany
| | - Khalida Sabeur
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research and
- Department of Pediatrics, UCSF, San Francisco, California, USA
| | - Manideep Chavali
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research and
- Department of Pediatrics, UCSF, San Francisco, California, USA
| | - Rajneesh Srivastava
- Department of Neurology, School of Medicine, Technical University of Munich, Munich, Germany
| | - Matthias Heidenreich
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) and Max-Delbrück-Centrum für Molekulare Medizin (MDC), Berlin, Germany
| | - Kathryn C. Fitzgerald
- Departments of Neurology and Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Guiscard Seebohm
- Institute for Genetics of Heart Diseases (IfGH), Cellular Electrophysiology and Molecular Biology, UKM, Münster, Germany
| | - Christine Stadelmann
- Electron Microscopy Core Unit, Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany
- Institute of Neuropathology, University Medical Center, Göttingen, Germany
| | - Bernhard Hemmer
- Department of Neurology, School of Medicine, Technical University of Munich, Munich, Germany
- Munich Cluster for Systems Neurology, Munich, Germany
| | - Michael Platten
- Department of Neurology, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
- DKTK Clinical Cooperation Unit Neuroimmunology and Brain Tumor Immunology, German Cancer Research Center (DKFZ), INF 280, Heidelberg, Germany
- Interdisciplinary Center for Neurosciences (IZN) and
- Mannheim Center for Translational Neuroscience and Institute for Innate Immunoscience, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
| | - Thomas J. Jentsch
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP) and Max-Delbrück-Centrum für Molekulare Medizin (MDC), Berlin, Germany
- Neurocure Cluster of Excellence, Charité University Medicine Berlin, Berlin, Germany
| | - Maren Engelhardt
- Mannheim Center for Translational Neuroscience and Institute for Innate Immunoscience, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
- Institute of Neuroanatomy, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
- Institute of Anatomy and Cell Biology, Johannes Kepler University Linz, Linz, Austria
| | - Thomas Budde
- Institute of Physiology I, University of Münster, Münster, Germany
| | - Klaus-Armin Nave
- Electron Microscopy Core Unit, Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Peter A. Calabresi
- Departments of Neurology and Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Manuel A. Friese
- Institute of Neuroimmunology and Multiple Sclerosis, Center for Molecular Neurobiology Hamburg, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Ari J. Green
- Weill Institute for Neurosciences, Department of Neurology, UCSF, San Francisco, California, USA
- Department of Ophthalmology, UCSF, San Francisco, California, USA
| | - Claudio Acuna
- Chica and Heinz Schaller Research Group, Institute of Anatomy and Cell Biology, Heidelberg University, Heidelberg, Germany
| | - David H. Rowitch
- Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research and
- Department of Pediatrics, UCSF, San Francisco, California, USA
- Wellcome Trust–Medical Research Council Stem Cell Institute and
- Department of Paediatrics, University of Cambridge, Cambridge, United Kingdom
- Department of Neurosurgery, UCSF, San Francisco, California, USA
| | - Sven G. Meuth
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster (UKM), Münster, Germany
- Department of Neurology, University of Düsseldorf, Dusseldorf, Germany
| | - Lucas Schirmer
- Department of Neurology, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
- Interdisciplinary Center for Neurosciences (IZN) and
- Mannheim Center for Translational Neuroscience and Institute for Innate Immunoscience, Medical Faculty Mannheim, Heidelberg University, Heidelberg, Germany
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6
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Labbaf A, Dellin M, Komadowski M, Chetkovich DM, Decher N, Pape HC, Seebohm G, Budde T, Zobeiri M. Characterization of Kv1.2-mediated outward current in TRIP8b-deficient mice. Biol Chem 2023; 404:291-302. [PMID: 36852869 DOI: 10.1515/hsz-2023-0116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 02/16/2023] [Indexed: 03/01/2023]
Abstract
Tonic current through hyperpolarization-activated cyclic nucleotide-gated cation (HCN) channels is influencing neuronal firing properties and channel function is strongly influenced by the brain-specific auxiliary subunit tetratricopeptide repeat-containing Rab8b-interacting protein (TRIP8b). Since Kv1.2 channels and TRIP8b were also suggested to interact, we assessed brain Kv1.2 mRNA and protein expression as well as the reduction of K+ outward currents by Kv1.2-blocking compounds (Psora-4; tityustoxin-Kα, TsTX-Kα) in different brain areas of TRIP8b-deficient (TRIP8b -/- ) compared to wildtype (WT) mice. We found that transcription levels of Kv1.2 channels were not different between genotypes. Furthermore, Kv1.2 current amplitude was not affected upon co-expression with TRIP8b in oocytes. However, Kv1.2 immunofluorescence was stronger in dendritic areas of cortical and hippocampal neurons. Furthermore, the peak net outward current was increased and the inactivation of the Psora-4-sensitive current component was less pronounced in cortical neurons in TRIP8b -/- mice. In current clamp recordings, application of TsTX increased the excitability of thalamocortical (TC) neurons with increased number of elicited action potentials upon step depolarization. We conclude that TRIP8b may not preferentially influence the amplitude of current through Kv1.2 channels but seems to affect current inactivation and channel localization. In TRIP8b -/- a compensatory upregulation of other Kv channels was observed.
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Affiliation(s)
- Afsaneh Labbaf
- Institute of Physiology I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, D-48149 Münster, Germany
| | - Maurice Dellin
- Department of Cardiovascular Medicine, Institute for Genetics of Heart Diseases (IfGH), University Hospital Münster, Robert-Koch-Str. 45, D-48149 Münster, Germany
| | - Marlene Komadowski
- Institute of Physiology and Pathophysiology, Vegetative Physiology, Philipps-University of Marburg, Deutschhausstr. 1-2, 35037, Marburg, Germany
| | - Dane M Chetkovich
- Medical Center, Department of Neurology, Vanderbilt University, Nashville, TN, USA
| | - Niels Decher
- Institute of Physiology and Pathophysiology, Vegetative Physiology, Philipps-University of Marburg, Deutschhausstr. 1-2, 35037, Marburg, Germany
| | - Hans-Chrisitian Pape
- Institute of Physiology I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, D-48149 Münster, Germany
| | - Guiscard Seebohm
- Department of Cardiovascular Medicine, Institute for Genetics of Heart Diseases (IfGH), University Hospital Münster, Robert-Koch-Str. 45, D-48149 Münster, Germany
| | - Thomas Budde
- Institute of Physiology I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, D-48149 Münster, Germany
| | - Mehrnoush Zobeiri
- Institute of Physiology I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, D-48149 Münster, Germany
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7
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Rychlik N, Hundehege P, Budde T. Influence of inflammatory processes on thalamocortical activity. Biol Chem 2023; 404:303-310. [PMID: 36453998 DOI: 10.1515/hsz-2022-0215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 11/12/2022] [Indexed: 12/03/2022]
Abstract
It is known that the thalamus plays an important role in pathological brain conditions involved in demyelinating, inflammatory and neurodegenerative diseases such as Multiple Sclerosis (MS). Beside immune cells and cytokines, ion channels were found to be key players in neuroinflammation. MS is a prototypical example of an autoimmune disease of the central nervous system that is classified as a channelopathy where abnormal ion channel function leads to symptoms and clinical signs. Here we review the influence of the cytokine-ion channel interaction in the thalamocortical system in demyelination and inflammation.
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Affiliation(s)
- Nicole Rychlik
- Institute of Physiology I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, D-48149 Münster, Germany
| | - Petra Hundehege
- Department of Neurology with Institute of Translational Neurology, D-48149 Münster, Germany
| | - Thomas Budde
- Institute of Physiology I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, D-48149 Münster, Germany
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8
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Disse P, Aymanns I, Ritter N, Peischard S, Korn L, Wiendl H, Pawlowski M, Kovac S, Meuth SG, Budde T, Strutz-Seebohm N, Wünsch B, Seebohm G. A novel NMDA receptor test model based on hiPSC-derived neural cells. Biol Chem 2023; 404:267-277. [PMID: 36630596 DOI: 10.1515/hsz-2022-0216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 12/12/2022] [Indexed: 01/13/2023]
Abstract
N-Methyl-D-aspartate receptors (NMDARs) are central for learning and information processing in the brain. Dysfunction of NMDARs can play a key role in the pathogenesis of neurodegeneration and drug addiction. The development of selective NMDAR modulators represents a promising strategy to target these diseases. Among such modulating compounds are ifenprodil and its 3-benzazepine derivatives. Classically, the effects of these NMDAR modulators have been tested by techniques like two-electrode voltage clamp (TEVC), patch clamp, or fluorescence-based assays. However, testing their functional effects in complex human systems requires more advanced approaches. Here, we established a human induced pluripotent stem cell-derived (hiPSC-derived) neural cell system and proved its eligibility as a test system for investigating NMDAR modulators and pharmaceutical effects on human neurons.
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Affiliation(s)
- Paul Disse
- Institut für Genetik von Herzerkrankungen (IfGH), Zelluläre Elektrophysiologie, Universitätsklinikum Münster, D-48149 Münster, Germany
- Chembion, GRK 2515, Westfälische Wilhelms-Universität Münster, D-48149 Münster, Germany
| | - Isabel Aymanns
- Institut für Genetik von Herzerkrankungen (IfGH), Zelluläre Elektrophysiologie, Universitätsklinikum Münster, D-48149 Münster, Germany
| | - Nadine Ritter
- Institut für Genetik von Herzerkrankungen (IfGH), Zelluläre Elektrophysiologie, Universitätsklinikum Münster, D-48149 Münster, Germany
- Chembion, GRK 2515, Westfälische Wilhelms-Universität Münster, D-48149 Münster, Germany
| | - Stefan Peischard
- Institut für Genetik von Herzerkrankungen (IfGH), Zelluläre Elektrophysiologie, Universitätsklinikum Münster, D-48149 Münster, Germany
| | - Lisanne Korn
- Klinik für Neurologie mit Institut für Translationale Neurologie, Universitätsklinikum Münster, D-48149 Münster, Germany
| | - Heinz Wiendl
- Klinik für Neurologie mit Institut für Translationale Neurologie, Universitätsklinikum Münster, D-48149 Münster, Germany
| | - Matthias Pawlowski
- Klinik für Neurologie mit Institut für Translationale Neurologie, Universitätsklinikum Münster, D-48149 Münster, Germany
| | - Stjepana Kovac
- Klinik für Neurologie mit Institut für Translationale Neurologie, Universitätsklinikum Münster, D-48149 Münster, Germany
| | - Sven G Meuth
- Neurologische Klinik, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany
| | - Thomas Budde
- Institut für Physiologie I, Westfälische Wilhelms-Universität, D-48149 Münster, Germany
| | - Nathalie Strutz-Seebohm
- Institut für Genetik von Herzerkrankungen (IfGH), Zelluläre Elektrophysiologie, Universitätsklinikum Münster, D-48149 Münster, Germany
| | - Bernhard Wünsch
- Institut für Pharmazeutische and Medizinische Chemie, Westfälische Wilhelms-Universität Münster, D-48149 Münster, Germany
| | - Guiscard Seebohm
- Institut für Genetik von Herzerkrankungen (IfGH), Zelluläre Elektrophysiologie, Universitätsklinikum Münster, D-48149 Münster, Germany
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9
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Schroeter CB, Nelke C, Schewe M, Spohler L, Herrmann AM, Müntefering T, Huntemann N, Kuzikov M, Gribbon P, Albrecht S, Bock S, Hundehege P, Neelsen LC, Baukrowitz T, Seebohm G, Wünsch B, Bittner S, Ruck T, Budde T, Meuth SG. Validation of TREK1 ion channel activators as an immunomodulatory and neuroprotective strategy in neuroinflammation. Biol Chem 2023; 404:355-375. [PMID: 36774650 DOI: 10.1515/hsz-2022-0266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 01/16/2023] [Indexed: 02/13/2023]
Abstract
Modulation of two-pore domain potassium (K2P) channels has emerged as a novel field of therapeutic strategies as they may regulate immune cell activation and metabolism, inflammatory signals, or barrier integrity. One of these ion channels is the TWIK-related potassium channel 1 (TREK1). In the current study, we report the identification and validation of new TREK1 activators. Firstly, we used a modified potassium ion channel assay to perform high-throughput-screening of new TREK1 activators. Dose-response studies helped to identify compounds with a high separation between effectiveness and toxicity. Inside-out patch-clamp measurements of Xenopus laevis oocytes expressing TREK1 were used for further validation of these activators regarding specificity and activity. These approaches yielded three substances, E1, B3 and A2 that robustly activate TREK1. Functionally, we demonstrated that these compounds reduce levels of adhesion molecules on primary human brain and muscle endothelial cells without affecting cell viability. Finally, we studied compound A2 via voltage-clamp recordings as this activator displayed the strongest effect on adhesion molecules. Interestingly, A2 lacked TREK1 activation in the tested neuronal cell type. Taken together, this study provides data on novel TREK1 activators that might be employed to pharmacologically modulate TREK1 activity.
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Affiliation(s)
- Christina B Schroeter
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstr. 5, D-40225 Düsseldorf, Germany
| | - Christopher Nelke
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstr. 5, D-40225 Düsseldorf, Germany
| | - Marcus Schewe
- Institute of Physiology, Christian-Albrechts University Kiel, Hermann-Rodewald-Straße 5, 24118 Kiel, Germany
| | - Lucas Spohler
- Department of Neurology with Institute for Translational Neurology, University Hospital Münster, Albert-Schweitzer-Campus 1, D-48149 Münster, Germany
| | - Alexander M Herrmann
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstr. 5, D-40225 Düsseldorf, Germany
| | - Thomas Müntefering
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstr. 5, D-40225 Düsseldorf, Germany
| | - Niklas Huntemann
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstr. 5, D-40225 Düsseldorf, Germany
| | - Maria Kuzikov
- Fraunhofer Institute for Translational Medicine and Pharmacology (ITMP), Schnackenburgallee 114, D-22525 Hamburg, Germany
- Fraunhofer Cluster of Excellence for Immune mediated diseases (CIMD), Theodor-Stern-Kai 7, D-60596 Frankfurt, Germany
| | - Philip Gribbon
- Fraunhofer Institute for Translational Medicine and Pharmacology (ITMP), Schnackenburgallee 114, D-22525 Hamburg, Germany
- Fraunhofer Cluster of Excellence for Immune mediated diseases (CIMD), Theodor-Stern-Kai 7, D-60596 Frankfurt, Germany
| | - Sarah Albrecht
- Department of Neurology with Institute for Translational Neurology, University Hospital Münster, Albert-Schweitzer-Campus 1, D-48149 Münster, Germany
| | - Stefanie Bock
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstr. 5, D-40225 Düsseldorf, Germany
| | - Petra Hundehege
- Department of Neurology with Institute for Translational Neurology, University Hospital Münster, Albert-Schweitzer-Campus 1, D-48149 Münster, Germany
| | - Lea Christine Neelsen
- Institute of Physiology, Christian-Albrechts University Kiel, Hermann-Rodewald-Straße 5, 24118 Kiel, Germany
| | - Thomas Baukrowitz
- Institute of Physiology, Christian-Albrechts University Kiel, Hermann-Rodewald-Straße 5, 24118 Kiel, Germany
| | - Guiscard Seebohm
- IfGH-Cellular Electrophysiology, Department of Cardiology and Angiology, University Hospital of Münster, Albert-Schweitzer-Campus 1, D-48149 Münster, Germany
| | - Bernhard Wünsch
- Institute for Pharmaceutical and Medicinal Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstraße 48, D-48149 Münster, Germany
| | - Stefan Bittner
- Department of Neurology, University Medical Center Mainz, Langenbeckstraße 1, D-55131 Mainz, Germany
| | - Tobias Ruck
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstr. 5, D-40225 Düsseldorf, Germany
| | - Thomas Budde
- Institute of Physiology I, University of Münster, Robert-Koch-Straße 27A, D-48149 Münster, Germany
| | - Sven G Meuth
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, Moorenstr. 5, D-40225 Düsseldorf, Germany
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10
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Dellin M, Rohrbeck I, Asrani P, Schreiber JA, Ritter N, Glorius F, Wünsch B, Budde T, Temme L, Strünker T, Stallmeyer B, Tüttelmann F, Meuth SG, Spehr M, Matschke J, Steinbicker A, Gatsogiannis C, Stoll R, Strutz-Seebohm N, Seebohm G. The second PI(3,5)P 2 binding site in the S0 helix of KCNQ1 stabilizes PIP 2-at the primary PI1 site with potential consequences on intermediate-to-open state transition. Biol Chem 2023; 404:241-254. [PMID: 36809224 DOI: 10.1515/hsz-2022-0247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 12/13/2022] [Indexed: 02/23/2023]
Abstract
The Phosphatidylinositol 3-phosphate 5-kinase Type III PIKfyve is the main source for selectively generated phosphatidylinositol 3,5-bisphosphate (PI(3,5)P2), a known regulator of membrane protein trafficking. PI(3,5)P2 facilitates the cardiac KCNQ1/KCNE1 channel plasma membrane abundance and therewith increases the macroscopic current amplitude. Functional-physical interaction of PI(3,5)P2 with membrane proteins and its structural impact is not sufficiently understood. This study aimed to identify molecular interaction sites and stimulatory mechanisms of the KCNQ1/KCNE1 channel via the PIKfyve-PI(3,5)P2 axis. Mutational scanning at the intracellular membrane leaflet and nuclear magnetic resonance (NMR) spectroscopy identified two PI(3,5)P2 binding sites, the known PIP2 site PS1 and the newly identified N-terminal α-helix S0 as relevant for functional PIKfyve effects. Cd2+ coordination to engineered cysteines and molecular modeling suggest that repositioning of S0 stabilizes the channel s open state, an effect strictly dependent on parallel binding of PI(3,5)P2 to both sites.
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Affiliation(s)
- Maurice Dellin
- IfGH-Cellular Electrophysiology, Department of Cardiology and Angiology, University Hospital of Münster, Robert-Koch Str. 45, D-48149, Münster, Germany
| | - Ina Rohrbeck
- IfGH-Cellular Electrophysiology, Department of Cardiology and Angiology, University Hospital of Münster, Robert-Koch Str. 45, D-48149, Münster, Germany
| | - Purva Asrani
- Faculty of Chemistry and Biochemistry, Biomolecular NMR Spectroscopy and RUBiospek|NMR, Ruhr University of Bochum, Universitätsstraße 150, D-44780, Bochum, Germany
| | - Julian A Schreiber
- IfGH-Cellular Electrophysiology, Department of Cardiology and Angiology, University Hospital of Münster, Robert-Koch Str. 45, D-48149, Münster, Germany
- Institut für Pharmazeutische und Medizinische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 48, D-48149, Münster, Germany
| | - Nadine Ritter
- IfGH-Cellular Electrophysiology, Department of Cardiology and Angiology, University Hospital of Münster, Robert-Koch Str. 45, D-48149, Münster, Germany
- GRK 2515, Chemical biology of ion channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Frank Glorius
- GRK 2515, Chemical biology of ion channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, D-48149, Münster, Germany
| | - Bernhard Wünsch
- Institut für Pharmazeutische und Medizinische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 48, D-48149, Münster, Germany
- GRK 2515, Chemical biology of ion channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Thomas Budde
- GRK 2515, Chemical biology of ion channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany
- Institute of Physiology I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, D-48149, Münster, Germany
| | - Louisa Temme
- Institut für Pharmazeutische und Medizinische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 48, D-48149, Münster, Germany
- GRK 2515, Chemical biology of ion channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Timo Strünker
- GRK 2515, Chemical biology of ion channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany
- Centre of Reproductive Medicine and Andrology, University Hospital Münster, University of Münster, Domagkstraße 11, D-48149, Münster, Germany
- Cells in Motion Interfaculty Centre, University of Münster, Münster, Germany
| | - Birgit Stallmeyer
- Institute of Reproductive Genetics, University of Münster, Vesaliusweg 12-14, D-48149, Münster, Germany
| | - Frank Tüttelmann
- Institute of Reproductive Genetics, University of Münster, Vesaliusweg 12-14, D-48149, Münster, Germany
| | - Sven G Meuth
- Department of Neurology, Heinrich Heine University Düsseldorf, Moorenstraße 5, D-40225, Düsseldorf, Germany
| | - Marc Spehr
- Department of Chemosensation, Institute for Biology II, RWTH Aachen University, Worringerweg 3, D-52074, Aachen, Germany
| | - Johann Matschke
- Institute of Cell Biology (Cancer Research), University Hospital Essen, University of Duisburg-Essen, D-45147, Essen, Germany
| | - Andrea Steinbicker
- Goethe University Frankfurt and University Hospital Frankfurt, Theodor-Stern-Kai 7, D-60590, Frankfurt, Germany
| | - Christos Gatsogiannis
- Institute for Medical Physics and Biophysics and Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster, Münster, Busso-Peus Strasse 10, D-48149, Germany
| | - Raphael Stoll
- Faculty of Chemistry and Biochemistry, Biomolecular NMR Spectroscopy and RUBiospek|NMR, Ruhr University of Bochum, Universitätsstraße 150, D-44780, Bochum, Germany
| | - Nathalie Strutz-Seebohm
- IfGH-Cellular Electrophysiology, Department of Cardiology and Angiology, University Hospital of Münster, Robert-Koch Str. 45, D-48149, Münster, Germany
| | - Guiscard Seebohm
- IfGH-Cellular Electrophysiology, Department of Cardiology and Angiology, University Hospital of Münster, Robert-Koch Str. 45, D-48149, Münster, Germany
- GRK 2515, Chemical biology of ion channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany
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11
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Patberg M, Oniani T, Disse P, Peischard S, Vinnenberg L, Zobeiri M, Romanelli MN, Epping L, Wiendl H, Meuth SG, Hundehege P, Seebohm G, Budde T, Junker A. Optimized synthesis and pharmacological evaluation of HCN channel inhibitor EC18. Arch Pharm (Weinheim) 2023:e2200665. [PMID: 36949271 DOI: 10.1002/ardp.202200665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 02/23/2023] [Accepted: 02/24/2023] [Indexed: 03/24/2023]
Abstract
HCN4 channels are considered to be a promising target for cardiac pathologies, epilepsy, and multiple sclerosis. However, there are no subtype-selective HCN channel blockers available, and only a few compounds are reported to display subtype preferences, one of which is EC18 (cis-1). Herein, we report the optimized synthetic route for the preparation of EC18 and its evaluation in three different pharmacological models, allowing us to assess its activity on cardiac function, thalamocortical neurons, and immune cells.
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Affiliation(s)
- Marius Patberg
- European Institute for Molecular Imaging (EIMI), Münster, Germany
| | | | - Paul Disse
- Cellular Electrophysiology and Molecular Biology, Institute for Genetics of Heart Diseases (IfGH), University of Münster, Münster, Germany
| | - Stefan Peischard
- Cellular Electrophysiology and Molecular Biology, Institute for Genetics of Heart Diseases (IfGH), University of Münster, Münster, Germany
| | - Laura Vinnenberg
- Klinik für Neurologie mit Institut für Translationale Neurologie, ICB, Münster, Germany
| | | | - Maria N Romanelli
- Department of Neurosciences, Psychology, Drug Research and Child Health (NeuroFarBa), University of Florence, Florence, Italy
| | - Lisa Epping
- Klinik für Neurologie mit Institut für Translationale Neurologie, ICB, Münster, Germany
| | - Heinz Wiendl
- Klinik für Neurologie mit Institut für Translationale Neurologie, ICB, Münster, Germany
| | - Sven G Meuth
- Universitätsklinikum Düsseldorf, Medizinische Fakultät, Klinik für Neurologie, Düsseldorf, Germany
| | - Petra Hundehege
- Klinik für Neurologie mit Institut für Translationale Neurologie, ICB, Münster, Germany
| | - Guiscard Seebohm
- Cellular Electrophysiology and Molecular Biology, Institute for Genetics of Heart Diseases (IfGH), University of Münster, Münster, Germany
| | | | - Anna Junker
- European Institute for Molecular Imaging (EIMI), Münster, Germany
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12
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Bozorgi H, Rashidy-Pour A, Moradikor N, Motaghi E, Zamani M, Budde T, Darbanian H. Reversal of chronic restraint stress-induced memory impairment by Japanese sake yeast supplement in mice: Role of adenosine A 1 and A 2A receptors. J Psychiatr Res 2023; 161:123-131. [PMID: 36921500 DOI: 10.1016/j.jpsychires.2023.02.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 02/11/2023] [Accepted: 02/23/2023] [Indexed: 03/18/2023]
Abstract
Controversial studies indicate the adenosine compound (a neuromodulator with neuroprotective activity) intervention on cognitive performance. On the other hand, Japanese sake yeast has been enriched with oral adenosine analogs as a novel natural agent. As the first report, we aimed to evaluate the effects of Japanese sake yeast supplement in a mouse model of chronic restraint stress-induced cognitive dysfunction. Mice were subjected to a one-week stress protocol and concomitantly treated orally with sake yeast at the dose level of 100, 200 and 300 mg/kg once daily for a week. The spatial and conditioned fear memory functions were evaluated with the Morris Water Maze (MWM) and the Passive Avoidance Learning (PAL) test, respectively. In all dosing regimens, improvements in spatial cognition were observed significantly in the MWM. 200 and 300 mg/kg of sake yeast significantly improved short- and long-term fear memory functions in the PAL test. Memory-enhancing effect of sake yeast was potentiated by the injection of ZM241385 (15 mg/kg), a selective adenosine A2A receptor (A2AR) antagonist, but completely disappeared by the injection of 8-cyclopentyltheophylline (CPT-8, 10 mg/kg), a selective adenosine A1 receptor (A1R) antagonist. The findings of the present study demonstrate the efficacy of sake yeast in acting as a cognitive performance-enhancing agent. Eventually, sake yeast and its ingredient S-adenosyl methionine (SAM) may be useful in improving memory in patients suffering from many dementia forms including Alzheimer's disease (AD).
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Affiliation(s)
- Hooman Bozorgi
- Research Center of Physiology, Department of Pharmacology, Semnan University of Medical Sciences, Semnan, Iran
| | - Ali Rashidy-Pour
- Research Center of Physiology, Semnan University of Medical Sciences, Semnan, Iran
| | - Nasrollah Moradikor
- International Center for Neuroscience Research, Institute for Intelligent Research, Tbilisi, Georgia.
| | - Ehsan Motaghi
- Department of Physiology and Pharmacology, School of Medicine, Kurdistan University of Medical Sciences, Sanandaj, Iran.
| | | | - Thomas Budde
- Institute of Physiology I, Westphalian Wilhelms-University, Münster, Germany
| | - Hamed Darbanian
- School of Paramedical Sciences, Semnan University of Medical Sciences, Semnan, Iran
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13
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Thale I, Maskri S, Grey L, Todesca LM, Budde T, Maisuls I, Strassert CA, Koch O, Schwab A, Wünsch B. Imaging of K Ca 3.1 Channels in Tumor Cells with PET and Small-Molecule Fluorescent Probes. ChemMedChem 2023; 18:e202200551. [PMID: 36315933 PMCID: PMC10098740 DOI: 10.1002/cmdc.202200551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 10/31/2022] [Indexed: 01/20/2023]
Abstract
The Ca2+ activated K+ channel KCa 3.1 is overexpressed in several human tumor cell lines, e. g. clear cell renal carcinoma, prostate cancer, non-small cell lung cancer. Highly aggressive cancer cells use this ion channel for key processes of the metastatic cascade such as migration, extravasation and invasion. Therefore, small molecules, which are able to image this KCa 3.1 channel in vitro and in vivo represent valuable diagnostic and prognostic tool compounds. The [18 F]fluoroethyltriazolyl substituted senicapoc was used as positron emission tomography (PET) tracer and showed promising properties for imaging of KCa 3.1 channels in lung adenocarcinoma cells in mice. The novel senicapoc BODIPY conjugates with two F-atoms (9 a) and with a F-atom and a methoxy moiety (9 b) at the B-atom led to the characteristic punctate staining pattern resulting from labeling of single KCa 3.1 channels in A549-3R cells. This punctate pattern was completely removed by preincubation with an excess of senicapoc confirming the high specificity of KCa 3.1 labeling. Due to the methoxy moiety at the B-atom and the additional oxyethylene unit in the spacer, 9 b exhibits higher polarity, which improves solubility and handling without reduction of fluorescence quantum yield. Docking studies using a cryo-electron microscopy (EM) structure of the KCa 3.1 channel confirmed the interaction of 9 a and 9 b with a binding pocket in the channel pore.
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Affiliation(s)
- Insa Thale
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Institut für Pharmazeutische und Medizinische Chemie, Corrensstraße 48, 48149, Münster, Germany
| | - Sarah Maskri
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Institut für Pharmazeutische und Medizinische Chemie, Corrensstraße 48, 48149, Münster, Germany
| | - Lucie Grey
- Westfälische Wilhelms-Universität Münster, Institut für Pharmazeutische und Medizinische Chemie, Corrensstraße 48, 48149, Münster, Germany
| | - Luca Matteo Todesca
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Universitätsklinikum Münster, Institute of Physiology II, Robert-Koch-Straße 27b, 48149, Münster, Germany
| | - Thomas Budde
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Universitätsklinikum Münster, Institute of Physiology I, Robert-Koch-Straße 27a, 48149, Münster, Germany
| | - Ivan Maisuls
- Westfälische Wilhelms-Universität Münster, Institut für Anorganische und Analytische Chemie CiMIC, SoN, Corrensstraße 28, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, CeNTech, Heisenbergstraße 11, 48149, Münster, Germany
| | - Cristian A Strassert
- Westfälische Wilhelms-Universität Münster, Institut für Anorganische und Analytische Chemie CiMIC, SoN, Corrensstraße 28, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, CeNTech, Heisenbergstraße 11, 48149, Münster, Germany
| | - Oliver Koch
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Institut für Pharmazeutische und Medizinische Chemie, Corrensstraße 48, 48149, Münster, Germany
| | - Albrecht Schwab
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Universitätsklinikum Münster, Institute of Physiology II, Robert-Koch-Straße 27b, 48149, Münster, Germany
| | - Bernhard Wünsch
- Westfälische Wilhelms-Universität Münster, GRK 2515, Chemical biology of ion channels (Chembion), Corrensstraße 48, 48149, Münster, Germany.,Westfälische Wilhelms-Universität Münster, Institut für Pharmazeutische und Medizinische Chemie, Corrensstraße 48, 48149, Münster, Germany
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14
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Gola L, Bierhansl L, Hummel N, Korn L, Pawlowski M, Cerina M, Hundehege P, Budde T, König S, Meuth SG, Wiendl H, Kovac S. MMF induces antioxidative and anaplerotic pathways and is neuroprotective in hyperexcitability in vitro. Free Radic Biol Med 2023; 194:337-346. [PMID: 36521578 DOI: 10.1016/j.freeradbiomed.2022.12.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 11/05/2022] [Accepted: 12/11/2022] [Indexed: 12/15/2022]
Abstract
Hyperexcitability-induced neuronal damage plays a role both in epilepsy as well as in inflammatory brain diseases such as multiple sclerosis (MS) and as such represents an important disease pathway which potentially can be targeted to mitigate neuronal damage. Dimethyl fumarate (DMF) and its pharmacologically active metabolite monomethyl fumarate (MMF) are FDA-approved therapeutics for MS, which can induce immunosuppressive and antioxidant pathways, and their neuroprotective capacity has been demonstrated in other preclinical neurological disease models before. In this study, we used an unbiased proteomic approach to identify potential new targets upon the treatment of MMF in glio-neuronal hippocampal cultures. MMF treatment results in induction of antioxidative (HMOX1, NQO1) and anaplerotic metabolic (GAPDH, PC) pathways, which correlated with reduction in ROS production, increased mitochondrial NADH-redox index and decreased NADH pool, independent of glutathione levels. Additionally, MMF reduced glycolytic capacity indicating individual intra-cellular metabolic programs within different cell types. Furthermore, we demonstrate a neuroprotective effect of MMF upon hyperexcitability in vitro (low magnesium model), where MMF prevents glio-neuronal death via reduced ROS production. These results highlight MMF as a potential new therapeutic opportunity in hyperexcitability-induced neurodegeneration.
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Affiliation(s)
- Lukas Gola
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Laura Bierhansl
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Nicolas Hummel
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Lisanne Korn
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Matthias Pawlowski
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Manuela Cerina
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Petra Hundehege
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Thomas Budde
- Department of Neurophysiology, University of Münster, Münster, Germany
| | - Simone König
- Core Unit Proteomics, Interdisciplinary Center for Clinical Research, Medical Faculty, University of Münster, Münster, Germany
| | - Sven G Meuth
- Department of Neurology, Medical Faculty and University Hospital, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Heinz Wiendl
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Stjepana Kovac
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Münster, Germany.
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15
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Schroeter CB, Rolfes L, Gothan KSS, Gruchot J, Herrmann AM, Bock S, Fazio L, Henes A, Narayanan V, Pfeuffer S, Nelke C, Räuber S, Huntemann N, Duarte-Silva E, Dobelmann V, Hundehege P, Wiendl H, Raba K, Küry P, Kremer D, Ruck T, Müntefering T, Budde T, Cerina M, Meuth SG. Cladribine treatment improves cortical network functionality in a mouse model of autoimmune encephalomyelitis. J Neuroinflammation 2022; 19:270. [DOI: 10.1186/s12974-022-02588-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 09/07/2022] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Cladribine is a synthetic purine analogue that interferes with DNA synthesis and repair next to disrupting cellular proliferation in actively dividing lymphocytes. The compound is approved for the treatment of multiple sclerosis (MS). Cladribine can cross the blood–brain barrier, suggesting a potential effect on central nervous system (CNS) resident cells. Here, we explored compartment-specific immunosuppressive as well as potential direct neuroprotective effects of oral cladribine treatment in experimental autoimmune encephalomyelitis (EAE) mice.
Methods
In the current study, we compare immune cell frequencies and phenotypes in the periphery and CNS of EAE mice with distinct grey and white matter lesions (combined active and focal EAE) either orally treated with cladribine or vehicle, using flow cytometry. To evaluate potential direct neuroprotective effects, we assessed the integrity of the primary auditory cortex neuronal network by studying neuronal activity and spontaneous synaptic activity with electrophysiological techniques ex vivo.
Results
Oral cladribine treatment significantly attenuated clinical deficits in EAE mice. Ex vivo flow cytometry showed that cladribine administration led to peripheral immune cell depletion in a compartment-specific manner and reduced immune cell infiltration into the CNS. Histological evaluations revealed no significant differences for inflammatory lesion load following cladribine treatment compared to vehicle control. Single cell electrophysiology in acute brain slices was performed and showed an impact of cladribine treatment on intrinsic cellular firing patterns and spontaneous synaptic transmission in neurons of the primary auditory cortex. Here, cladribine administration in vivo partially restored cortical neuronal network function, reducing action potential firing. Both, the effect on immune cells and neuronal activity were transient.
Conclusions
Our results indicate that cladribine exerts a neuroprotective effect after crossing the blood–brain barrier independently of its peripheral immunosuppressant action.
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16
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Fuest S, Post C, Balbach ST, Jabar S, Neumann I, Schimmelpfennig S, Sargin S, Nass E, Budde T, Kailayangiri S, Altvater B, Ranft A, Hartmann W, Dirksen U, Rössig C, Schwab A, Pethő Z. Relevance of Abnormal KCNN1 Expression and Osmotic Hypersensitivity in Ewing Sarcoma. Cancers (Basel) 2022; 14:cancers14194819. [PMID: 36230742 PMCID: PMC9564116 DOI: 10.3390/cancers14194819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 09/27/2022] [Accepted: 09/29/2022] [Indexed: 12/02/2022] Open
Abstract
Simple Summary The main oncogene in Ewing sarcoma directly drives a high expression of a previously unknown variant KCNN1 (encoding the KCa2.1 channel) that we also verified in samples from >200 patients. Yet, we found that the channel is not functional and does not modulate Ewing sarcoma cell behavior. We could explain this lack of functional impact by the surprising absence of any KCa2.1-carried K+ current in Ewing sarcoma cells. However, we show in a proof-of-principle study that the essential lack of a K+ conductance can be exploited by applying hypoosmotic stress and effectively and selectively killing the Ewing sarcoma cells. Abstract Ewing sarcoma (EwS) is a rare and highly malignant bone tumor occurring mainly in childhood and adolescence. Physiologically, the bone is a central hub for Ca2+ homeostasis, which is severely disturbed by osteolytic processes in EwS. Therefore, we aimed to investigate how ion transport proteins involved in Ca2+ homeostasis affect EwS pathophysiology. We characterized the expression of 22 candidate genes of Ca2+-permeable or Ca2+-regulated ion channels in three EwS cell lines and found the Ca2+-activated K+ channel KCa2.1 (KCNN1) to be exceptionally highly expressed. We revealed that KCNN1 expression is directly regulated by the disease-driving oncoprotein EWSR1-FL1. Due to its consistent overexpression in EwS, KCNN1 mRNA could be a prognostic marker in EwS. In a large cohort of EwS patients, however, KCNN1 mRNA quantity does not correlate with clinical parameters. Several functional studies including patch clamp electrophysiology revealed no evidence for KCa2.1 function in EwS cells. Thus, elevated KCNN1 expression is not translated to KCa2.1 channel activity in EwS cells. However, we found that the low K+ conductance of EwS cells renders them susceptible to hypoosmotic solutions. The absence of a relevant K+ conductance in EwS thereby provides an opportunity for hypoosmotic therapy that can be exploited during tumor surgery.
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Affiliation(s)
- Sebastian Fuest
- Institute of Physiology II, University Münster, 48149 Münster, Germany
| | - Christoph Post
- Institute of Physiology II, University Münster, 48149 Münster, Germany
| | - Sebastian T. Balbach
- Department of Pediatric Hematology and Oncology, University Children’s Hospital Münster, 48149 Münster, Germany
| | - Susanne Jabar
- Pediatrics III, University Hospital Essen, 45147 Essen, Germany
| | - Ilka Neumann
- Institute of Physiology II, University Münster, 48149 Münster, Germany
| | | | - Sarah Sargin
- Institute of Physiology II, University Münster, 48149 Münster, Germany
| | - Elke Nass
- Institute of Physiology I, University Münster, 48149 Münster, Germany
| | - Thomas Budde
- Institute of Physiology I, University Münster, 48149 Münster, Germany
| | - Sareetha Kailayangiri
- Department of Pediatric Hematology and Oncology, University Children’s Hospital Münster, 48149 Münster, Germany
| | - Bianca Altvater
- Department of Pediatric Hematology and Oncology, University Children’s Hospital Münster, 48149 Münster, Germany
| | - Andreas Ranft
- Pediatrics III, University Hospital Essen, 45147 Essen, Germany
| | - Wolfgang Hartmann
- Division of Translational Pathology, Gerhard-Domagk-Institute of Pathology, University Münster, 48149 Münster, Germany
| | - Uta Dirksen
- Pediatrics III, University Hospital Essen, 45147 Essen, Germany
| | - Claudia Rössig
- Department of Pediatric Hematology and Oncology, University Children’s Hospital Münster, 48149 Münster, Germany
| | - Albrecht Schwab
- Institute of Physiology II, University Münster, 48149 Münster, Germany
| | - Zoltán Pethő
- Institute of Physiology II, University Münster, 48149 Münster, Germany
- Correspondence:
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17
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Konken CP, Heßling K, Thale I, Schelhaas S, Dabel J, Maskri S, Bulk E, Budde T, Koch O, Schwab A, Schäfers M, Wünsch B. Imaging of the calcium activated potassium channel 3.1 (K Ca 3.1) in vivo using a senicapoc-derived positron emission tomography tracer. Arch Pharm (Weinheim) 2022; 355:e2200388. [PMID: 36161669 DOI: 10.1002/ardp.202200388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 09/05/2022] [Accepted: 09/06/2022] [Indexed: 11/10/2022]
Abstract
The calcium-activated potassium channel 3.1 (KCa 3.1) is overexpressed in many tumor entities and has predictive power concerning disease progression and outcome. Imaging of the KCa 3.1 channel in vivo using a radiotracer for positron emission tomography (PET) could therefore establish a potentially powerful diagnostic tool. Senicapoc shows high affinity and excellent selectivity toward the KCa 3.1 channel. We have successfully pursued the synthesis of the 18 F-labeled derivative [18 F]3 of senicapoc using the prosthetic group approach with 1-azido-2-[18 F]fluoroethane ([18 F]6) in a "click" reaction. The biological activity of the new PET tracer was evaluated in vitro and in vivo. Inhibition of the KCa 3.1 channel by 3 was demonstrated by patch clamp experiments and the binding pose was analyzed by docking studies. In mouse and human serum, [18 F]3 was stable for at least one half-life of [18 F]fluorine. Biodistribution experiments in wild-type mice were promising, showing rapid and predominantly renal excretion. An in vivo study using A549-based tumor-bearing mice was performed. The tumor signal could be delineated and image analysis showed a tumor-to-muscle ratio of 1.47 ± 0.24. The approach using 1-azido-2-[18 F]fluoroethane seems to be a good general strategy to achieve triarylacetamide-based fluorinated PET tracers for imaging of the KCa 3.1 channel in vivo.
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Affiliation(s)
- Christian P Konken
- Department of Nuclear Medicine, University Hospital Münster, Münster, Germany
| | - Kathrin Heßling
- Institute of Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster, Münster, Germany
| | - Insa Thale
- Institute of Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster, Münster, Germany.,GRK 2515, Chemical Biology of Ion Channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Sonja Schelhaas
- European Institute for Molecular Imaging (EIMI), Westphalian Wilhelms-University Münster, Münster, Germany.,Cells-in-Motion Interfaculty Center, Westphalian Wilhelms-University Münster, Münster, Germany
| | - Jennifer Dabel
- European Institute for Molecular Imaging (EIMI), Westphalian Wilhelms-University Münster, Münster, Germany
| | - Sarah Maskri
- Institute of Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster, Münster, Germany.,GRK 2515, Chemical Biology of Ion Channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Etmar Bulk
- Institute for Physiology II, University Hospital Münster, Münster, Germany
| | - Thomas Budde
- GRK 2515, Chemical Biology of Ion Channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany.,Institute for Physiology I, University Hospital Münster, Münster, Germany
| | - Oliver Koch
- Institute of Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster, Münster, Germany.,GRK 2515, Chemical Biology of Ion Channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Albrecht Schwab
- GRK 2515, Chemical Biology of Ion Channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany.,Institute for Physiology II, University Hospital Münster, Münster, Germany
| | - Michael Schäfers
- Department of Nuclear Medicine, University Hospital Münster, Münster, Germany.,European Institute for Molecular Imaging (EIMI), Westphalian Wilhelms-University Münster, Münster, Germany.,Cells-in-Motion Interfaculty Center, Westphalian Wilhelms-University Münster, Münster, Germany
| | - Bernhard Wünsch
- Institute of Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster, Münster, Germany.,GRK 2515, Chemical Biology of Ion Channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany.,Cells-in-Motion Interfaculty Center, Westphalian Wilhelms-University Münster, Münster, Germany
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18
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Peischard S, Möller M, Disse P, Ho HT, Verkerk AO, Strutz-Seebohm N, Budde T, Meuth SG, Schweizer PA, Morris S, Mücher L, Eisner V, Thomas D, Klingel K, Busch K, Seebohm G. Virus-induced inhibition of cardiac pacemaker channel HCN4 triggers bradycardia in human-induced stem cell system. Cell Mol Life Sci 2022; 79:440. [PMID: 35864219 PMCID: PMC9304080 DOI: 10.1007/s00018-022-04435-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 06/16/2022] [Accepted: 06/17/2022] [Indexed: 12/02/2022]
Abstract
The enterovirus Coxsackievirus B3 (CVB3) is known to be a major source for the development of cardiac dysfunctions like viral myocarditis (VMC) and dilatative cardiomyopathy (DCM), but also results in bradycardia and fatal cardiac arrest. Besides clinical reports on bradycardia and sudden cardiac death, very little is known about the influence of CVB3 on the activity of human cardiac pacemaker cells. Here, we address this issue using the first human induced pluripotent stem cell (hiPSC)-derived pacemaker-like cells, in which the expression of a transgenic non-infectious variant of CVB3 can be controlled dose- and time-dependently. We found that CVB3 drastically changed hyperpolarization-activated cyclic nucleotide-gated channel 4 (HCN4) distribution and function in hiPSC-derived pacemaker-like tissue. In addition, using HCN4 cell expression systems, we found that HCN4 currents were decreased with altered voltage dependency of activation when CVB3 was expressed. Increased autophagosome formation and autophagosomal HCN4 insertion was observed in hiPSC-derived pacemaker-like cells under CVB3 expression as well. Individual effects of single, non-structural CVB3 proteins were analyzed and demonstrated that CVB3 proteins 2C and 3A had the most robust effect on HCN4 activity. Treatment of cells with the Rab7 inhibitor CID 106770 or the CVB3-3A inhibitor GW5074 led to the recovery of the cytoplasmatic HCN4 accumulation into a healthy appearing phenotype, indicating that malfunctioning Rab7-directed autophagosome transport is involved in the disturbed, cytoplasmatic HCN4 accumulation in CVB3-expressing human pacemaker-like cells. Summarizing, the enterovirus CVB3 inhibits human cardiac pacemaker function by reducing the pacemaker channel plasma membrane density, an effect that can be corrected by pharmacological intervention of endocytic vesicle trafficking.
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Affiliation(s)
- Stefan Peischard
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany
| | - Melina Möller
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany
| | - Paul Disse
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany.,GRK 2515, Chemical Biology of Ion Channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Huyen Tran Ho
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany
| | - Arie O Verkerk
- Department of Medical Biology, Amsterdam University Medical Centers, University of Amsterdam, 1105, Amsterdam, The Netherlands
| | - Nathalie Strutz-Seebohm
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany.,GRK 2515, Chemical Biology of Ion Channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Thomas Budde
- GRK 2515, Chemical Biology of Ion Channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany.,Institute of Physiology I, Westfälische-Wilhems Universität Münster, 48149, Münster, Germany
| | - Sven G Meuth
- GRK 2515, Chemical Biology of Ion Channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany.,Department of Neurology, Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany
| | - Patrick A Schweizer
- Department of Cardiology, Medical University Hospital Heidelberg, 69120, Heidelberg, Germany.,HCR (Heidelberg Center for Heart Rhythm Disorders), University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Silke Morris
- Institute for Integrative Cell Biology and Physiology, Department of Biology, University of Münster, 48149, Münster, Germany
| | - Lena Mücher
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany
| | - Verónica Eisner
- Department of Cellular and Molecular Biology, School of Biological Sciences, Pontificia Universidad Católica de Chile, 8331150, Santiago, Chile
| | - Dierk Thomas
- Department of Cardiology, Medical University Hospital Heidelberg, 69120, Heidelberg, Germany.,HCR (Heidelberg Center for Heart Rhythm Disorders), University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Karin Klingel
- Cardiopathology, Institute for Pathology and Neuropathology, University Hospital of Tuebingen, 72076, Tübingen, Germany
| | - Karin Busch
- Institute for Integrative Cell Biology and Physiology, Department of Biology, University of Münster, 48149, Münster, Germany
| | - Guiscard Seebohm
- Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, 48149, Münster, Germany. .,GRK 2515, Chemical Biology of Ion Channels (Chembion), Westfälische Wilhelms-Universität Münster, Münster, Germany.
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19
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Oniani T, Vinnenberg L, Chaudhary R, Schreiber JA, Riske K, Williams B, Pape HC, White JA, Junker A, Seebohm G, Meuth SG, Hundehege P, Budde T, Zobeiri M. Effects of Axonal Demyelination, Inflammatory Cytokines and Divalent Cation Chelators on Thalamic HCN Channels and Oscillatory Bursting. Int J Mol Sci 2022; 23:ijms23116285. [PMID: 35682964 PMCID: PMC9181513 DOI: 10.3390/ijms23116285] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 05/31/2022] [Accepted: 05/31/2022] [Indexed: 12/13/2022] Open
Abstract
Multiple sclerosis (MS) is a demyelinating disease of the central nervous system that is characterized by the progressive loss of oligodendrocytes and myelin and is associated with thalamic dysfunction. Cuprizone (CPZ)-induced general demyelination in rodents is a valuable model for studying different aspects of MS pathology. CPZ feeding is associated with the altered distribution and expression of different ion channels along neuronal somata and axons. However, it is largely unknown whether the copper chelator CPZ directly influences ion channels. Therefore, we assessed the effects of different divalent cations (copper; zinc) and trace metal chelators (EDTA; Tricine; the water-soluble derivative of CPZ, BiMPi) on hyperpolarization-activated cyclic nucleotide-gated (HCN) channels that are major mediators of thalamic function and pathology. In addition, alterations of HCN channels induced by CPZ treatment and MS-related proinflammatory cytokines (IL-1β; IL-6; INF-α; INF-β) were characterized in C57Bl/6J mice. Thus, the hyperpolarization-activated inward current (Ih) was recorded in thalamocortical (TC) neurons and heterologous expression systems (mHCN2 expressing HEK cells; hHCN4 expressing oocytes). A number of electrophysiological characteristics of Ih (potential of half-maximal activation (V0.5); current density; activation kinetics) were unchanged following the extracellular application of trace metals and divalent cation chelators to native neurons, cell cultures or oocytes. Mice were fed a diet containing 0.2% CPZ for 35 days, resulting in general demyelination in the brain. Withdrawal of CPZ from the diet resulted in rapid remyelination, the effects of which were assessed at three time points after stopping CPZ feeding (Day1, Day7, Day25). In TC neurons, Ih was decreased on Day1 and Day25 and revealed a transient increased availability on Day7. In addition, we challenged naive TC neurons with INF-α and IL-1β. It was found that Ih parameters were differentially altered by the application of the two cytokines to thalamic cells, while IL-1β increased the availability of HCN channels (depolarized V0.5; increased current density) and the excitability of TC neurons (depolarized resting membrane potential (RMP); increased the number of action potentials (APs); produced a larger voltage sag; promoted higher input resistance; increased the number of burst spikes; hyperpolarized the AP threshold), INF-α mediated contrary effects. The effect of cytokine modulation on thalamic bursting was further assessed in horizontal slices and a computational model of slow thalamic oscillations. Here, IL-1β and INF-α increased and reduced oscillatory bursting, respectively. We conclude that HCN channels are not directly modulated by trace metals and divalent cation chelators but are subject to modulation by different MS-related cytokines.
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Affiliation(s)
- Tengiz Oniani
- Institute of Physiology I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, D-48149 Münster, Germany; (T.O.); (R.C.); (H.-C.P.); (M.Z.)
| | - Laura Vinnenberg
- Department of Neurology with Institute of Translational Neurology, Albert-Schweitzer-Campus 1, D-48149 Münster, Germany; (L.V.); (P.H.)
| | - Rahul Chaudhary
- Institute of Physiology I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, D-48149 Münster, Germany; (T.O.); (R.C.); (H.-C.P.); (M.Z.)
| | - Julian A. Schreiber
- Institute of Pharmaceutical and Medicinal Chemistry, Westfälische Wilhelms-Universität, Corren-Str. 48, D-48149 Münster, Germany;
- Cellular Electrophysiology and Molecular Biology, Department of Cardiovascular Medicine, Institute for Genetics of Heart Diseases (IfGH), University Hospital Münster, Robert-Koch-Str. 45, D-48149 Münster, Germany;
| | - Kathrin Riske
- European Institute for Molecular Imaging (EIMI), Westfälische Wilhelms-Universität, Waldeyer-Str. 15, D-48149 Münster, Germany; (K.R.); (A.J.)
| | - Brandon Williams
- Center for Systems Neuroscience, Neurophotonics Center, Department of Biomedical Engineering, Boston University, 610 Commonwealth Ave., Boston, MA 02215, USA; (B.W.); (J.A.W.)
| | - Hans-Christian Pape
- Institute of Physiology I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, D-48149 Münster, Germany; (T.O.); (R.C.); (H.-C.P.); (M.Z.)
| | - John A. White
- Center for Systems Neuroscience, Neurophotonics Center, Department of Biomedical Engineering, Boston University, 610 Commonwealth Ave., Boston, MA 02215, USA; (B.W.); (J.A.W.)
| | - Anna Junker
- European Institute for Molecular Imaging (EIMI), Westfälische Wilhelms-Universität, Waldeyer-Str. 15, D-48149 Münster, Germany; (K.R.); (A.J.)
| | - Guiscard Seebohm
- Cellular Electrophysiology and Molecular Biology, Department of Cardiovascular Medicine, Institute for Genetics of Heart Diseases (IfGH), University Hospital Münster, Robert-Koch-Str. 45, D-48149 Münster, Germany;
| | - Sven G. Meuth
- Neurology Clinic, University Clinic Düsseldorf, Moorenstraße 5, D-40225 Düsseldorf, Germany;
| | - Petra Hundehege
- Department of Neurology with Institute of Translational Neurology, Albert-Schweitzer-Campus 1, D-48149 Münster, Germany; (L.V.); (P.H.)
| | - Thomas Budde
- Institute of Physiology I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, D-48149 Münster, Germany; (T.O.); (R.C.); (H.-C.P.); (M.Z.)
- Correspondence:
| | - Mehrnoush Zobeiri
- Institute of Physiology I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, D-48149 Münster, Germany; (T.O.); (R.C.); (H.-C.P.); (M.Z.)
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20
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Chaudhary R, Albrecht S, Datunashvili M, Cerina M, Lüttjohann A, Han Y, Narayanan V, Chetkovich DM, Ruck T, Kuhlmann T, Pape HC, Meuth SG, Zobeiri M, Budde T. Modulation of Pacemaker Channel Function in a Model of Thalamocortical Hyperexcitability by Demyelination and Cytokines. Cereb Cortex 2022; 32:4397-4421. [PMID: 35076711 PMCID: PMC9574242 DOI: 10.1093/cercor/bhab491] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 11/26/2021] [Accepted: 11/28/2021] [Indexed: 12/02/2022] Open
Abstract
A consensus is yet to be reached regarding the exact prevalence of epileptic seizures or epilepsy in multiple sclerosis (MS). In addition, the underlying pathophysiological basis of the reciprocal interaction among neuroinflammation, demyelination, and epilepsy remains unclear. Therefore, a better understanding of cellular and network mechanisms linking these pathologies is needed. Cuprizone-induced general demyelination in rodents is a valuable model for studying MS pathologies. Here, we studied the relationship among epileptic activity, loss of myelin, and pro-inflammatory cytokines by inducing acute, generalized demyelination in a genetic mouse model of human absence epilepsy, C3H/HeJ mice. Both cellular and network mechanisms were studied using in vivo and in vitro electrophysiological techniques. We found that acute, generalized demyelination in C3H/HeJ mice resulted in a lower number of spike–wave discharges, increased cortical theta oscillations, and reduction of slow rhythmic intrathalamic burst activity. In addition, generalized demyelination resulted in a significant reduction in the amplitude of the hyperpolarization-activated inward current (Ih) in thalamic relay cells, which was accompanied by lower surface expression of hyperpolarization-activated, cyclic nucleotide-gated channels, and the phosphorylated form of TRIP8b (pS237-TRIP8b). We suggest that demyelination-related changes in thalamic Ih may be one of the factors defining the prevalence of seizures in MS.
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Affiliation(s)
- Rahul Chaudhary
- Institut für Physiologie I, Westfälische Wilhelms-Universität, 48149 Münster, Germany
| | - Stefanie Albrecht
- Institute of Neuropathology, University Hospital Münster, 48149 Münster, Germany
| | - Maia Datunashvili
- Institut für Physiologie I, Westfälische Wilhelms-Universität, 48149 Münster, Germany
| | - Manuela Cerina
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, 48149 Münster, Germany
| | - Annika Lüttjohann
- Institut für Physiologie I, Westfälische Wilhelms-Universität, 48149 Münster, Germany
| | - Ye Han
- Vanderbilt University Medical Center, Department of Neurology, Nashville, TN 37232, USA
| | - Venu Narayanan
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, 48149 Münster, Germany
| | - Dane M Chetkovich
- Vanderbilt University Medical Center, Department of Neurology, Nashville, TN 37232, USA
| | - Tobias Ruck
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
| | - Tanja Kuhlmann
- Institute of Neuropathology, University Hospital Münster, 48149 Münster, Germany
| | - Hans-Christian Pape
- Institut für Physiologie I, Westfälische Wilhelms-Universität, 48149 Münster, Germany
| | - Sven G Meuth
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, 48149 Münster, Germany
- Department of Neurology, Medical Faculty, Heinrich Heine University Düsseldorf, 40225 Düsseldorf, Germany
| | - Mehrnoush Zobeiri
- Address correspondence to Dr Thomas Budde, Wilhelms-Universität, Institut für Physiologie I, Robert-Koch-Str. 27a, D-48149 Münster, Germany. ; Dr Mehrnoush Zobeiri, Wilhelms-Universität, Institut für Physiologie I, Robert-Koch-Str. 27a, D-48149 Münster, Germany.
| | - Thomas Budde
- Address correspondence to Dr Thomas Budde, Wilhelms-Universität, Institut für Physiologie I, Robert-Koch-Str. 27a, D-48149 Münster, Germany. ; Dr Mehrnoush Zobeiri, Wilhelms-Universität, Institut für Physiologie I, Robert-Koch-Str. 27a, D-48149 Münster, Germany.
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21
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Patberg M, Isaak A, Füsser F, Ortiz Zacarías NV, Vinnenberg L, Schulte J, Michetti L, Grey L, van der Horst C, Hundehege P, Koch O, Heitman LH, Budde T, Junker A. Piperazine squaric acid diamides, a novel class of allosteric P2X7 receptor antagonists. Eur J Med Chem 2021; 226:113838. [PMID: 34571173 DOI: 10.1016/j.ejmech.2021.113838] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 09/06/2021] [Accepted: 09/07/2021] [Indexed: 02/07/2023]
Abstract
The P2X7 receptor (P2X7R) stands out among the purinergic receptors due to its strong involvement in the regulation of tumor growth and metastasis formation as well as in innate immune responses and afferent signal transmission. Numerous studies have pointed out the beneficial effects of P2X7R antagonism for the treatment of a variety of cancer types, inflammatory diseases, and chronic pain. Herein we describe the development of novel P2X7R antagonists, incorporating piperazine squaric diamides as a central element. Besides improving the antagonists' potency from pIC50 values of 5.7-7.6, ADME properties (logD7.4 value, plasma protein binding, in vitro metabolic stability) of the generated compounds were investigated and optimized to provide novel P2X7R antagonists with drug-like properties. Furthermore, docking studies revealed the antagonists binding to the allosteric binding pocket in two distinct binding poses, depending on the substitution of the central piperazine moiety.
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Affiliation(s)
- Marius Patberg
- European Institute for Molecular Imaging (EIMI), Waldeyerstr. 15, 48149, Münster, Germany
| | - Andreas Isaak
- European Institute for Molecular Imaging (EIMI), Waldeyerstr. 15, 48149, Münster, Germany
| | - Friederike Füsser
- Institut für Pharmazeutische und Medizinische Chemie der Universität Münster, Corrensstr. 48, 48149, Münster, Germany
| | - Natalia V Ortiz Zacarías
- Leiden Academic Centre for Drug Research (LACDR), Leiden University, Division of Drug Discovery and Safety, Einsteinweg 55, 2333, CC Leiden, the Netherlands; Oncode Institute, Leiden, the Netherlands
| | - Laura Vinnenberg
- Klinik für Neurologie Mit Institut für Translationale Neurologie, ICB, Mendelstr. 7, 48149, Münster, Germany
| | - Janine Schulte
- European Institute for Molecular Imaging (EIMI), Waldeyerstr. 15, 48149, Münster, Germany
| | - Lucia Michetti
- European Institute for Molecular Imaging (EIMI), Waldeyerstr. 15, 48149, Münster, Germany
| | - Lucie Grey
- Institut für Pharmazeutische und Medizinische Chemie der Universität Münster, Corrensstr. 48, 48149, Münster, Germany
| | - Cas van der Horst
- Leiden Academic Centre for Drug Research (LACDR), Leiden University, Division of Drug Discovery and Safety, Einsteinweg 55, 2333, CC Leiden, the Netherlands
| | - Petra Hundehege
- Klinik für Neurologie Mit Institut für Translationale Neurologie, ICB, Mendelstr. 7, 48149, Münster, Germany
| | - Oliver Koch
- Institut für Pharmazeutische und Medizinische Chemie der Universität Münster, Corrensstr. 48, 48149, Münster, Germany
| | - Laura H Heitman
- Leiden Academic Centre for Drug Research (LACDR), Leiden University, Division of Drug Discovery and Safety, Einsteinweg 55, 2333, CC Leiden, the Netherlands; Oncode Institute, Leiden, the Netherlands
| | - Thomas Budde
- Institut für Physiologie I, Robert-Koch-Str. 27a, 48149, Münster, Germany
| | - Anna Junker
- European Institute for Molecular Imaging (EIMI), Waldeyerstr. 15, 48149, Münster, Germany.
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22
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Brömmel K, Konken CP, Börgel F, Obeng-Darko H, Schelhaas S, Bulk E, Budde T, Schwab A, Schäfers M, Wünsch B. Synthesis and biological evaluation of PET tracers designed for imaging of calcium activated potassium channel 3.1 (K Ca3.1) channels in vivo. RSC Adv 2021; 11:30295-30304. [PMID: 35480282 PMCID: PMC9041111 DOI: 10.1039/d1ra03850h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 09/05/2021] [Indexed: 12/14/2022] Open
Abstract
Expression of the Ca2+ activated potassium channel 3.1 (KCa3.1) channel (also known as the Gàrdos channel) is dysregulated in many tumor entities and has predictive power with respect to patient survival. Therefore, a positron emission tomography (PET) tracer targeting this ion channel could serve as a potential diagnostic tool by imaging the KCa3.1 channel in vivo. It was envisaged to synthesize [18F]senicapoc ([18F]1) since senicapoc (1) shows high affinity and excellent selectivity towards the KCa3.1 channels. Because problems occurred during 18F-fluorination, the [18F]fluoroethoxy senicapoc derivative [18F]28 was synthesized to generate an alternative PET tracer targeting the KCa3.1 channel. Inhibition of the KCa3.1 channel by 28 was confirmed by patch clamp experiments. In vitro stability in mouse and human serum was shown for 28. Furthermore, biodistribution experiments in wild type mice were performed. Since [18F]fluoride was detected in vivo after application of [18F]28, an in vitro metabolism study was conducted. A potential degradation route of fluoroethoxy derivatives in vivo was found which in general should be taken into account when designing new PET tracers for different targets with a [18F]fluoroethoxy moiety as well as when using the popular prosthetic group [18F]fluoroethyl tosylate for the alkylation of phenols. Expression of the Ca2+ activated potassium channel 3.1 (KCa3.1) channel (also known as the Gàrdos channel) is dysregulated in many tumor entities and has predictive power with respect to patient survival.![]()
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Affiliation(s)
- Kathrin Brömmel
- Institute for Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster Corrensstraße 48 D-48149 Münster Germany
| | - Christian Paul Konken
- Department of Nuclear Medicine, University Hospital Münster, Albert-Schweitzer-Campus 1 Building A1 D-48149 Münster Germany +49-8347363 +49-251-8344791
| | - Frederik Börgel
- Institute for Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster Corrensstraße 48 D-48149 Münster Germany
| | - Henry Obeng-Darko
- Institute for Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster Corrensstraße 48 D-48149 Münster Germany
| | - Sonja Schelhaas
- European Institute for Molecular Imaging (EIMI), Westphalian Wilhelms-University Münster Waldeyerstraße 15 D-48149 Münster Germany
| | - Etmar Bulk
- Institute for Physiology II, University Hospital Münster Robert-Koch-Straße 27b D-48149 Münster Germany
| | - Thomas Budde
- Institute for Physiology I, University Hospital Münster Robert-Koch-Straße 27a D-48149 Münster Germany.,Cells-in-Motion Interfaculty Center, Westphalian Wilhelms-University Münster Waldeyerstraße 15 D-84149 Münster Germany
| | - Albrecht Schwab
- Institute for Physiology II, University Hospital Münster Robert-Koch-Straße 27b D-48149 Münster Germany.,Cells-in-Motion Interfaculty Center, Westphalian Wilhelms-University Münster Waldeyerstraße 15 D-84149 Münster Germany
| | - Michael Schäfers
- Department of Nuclear Medicine, University Hospital Münster, Albert-Schweitzer-Campus 1 Building A1 D-48149 Münster Germany +49-8347363 +49-251-8344791.,European Institute for Molecular Imaging (EIMI), Westphalian Wilhelms-University Münster Waldeyerstraße 15 D-48149 Münster Germany.,Cells-in-Motion Interfaculty Center, Westphalian Wilhelms-University Münster Waldeyerstraße 15 D-84149 Münster Germany
| | - Bernhard Wünsch
- Institute for Pharmaceutical and Medicinal Chemistry, Westphalian Wilhelms-University Münster Corrensstraße 48 D-48149 Münster Germany.,Cells-in-Motion Interfaculty Center, Westphalian Wilhelms-University Münster Waldeyerstraße 15 D-84149 Münster Germany
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23
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Lee LM, Müntefering T, Budde T, Meuth SG, Ruck T. Pathophysiological Role of K 2P Channels in Human Diseases. Cell Physiol Biochem 2021; 55:65-86. [PMID: 33667332 DOI: 10.33594/000000338] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/07/2021] [Indexed: 11/06/2022] Open
Abstract
The family of two-pore domain potassium (K2P) channels is critically involved in central cellular functions such as ion homeostasis, cell development, and excitability. K2P channels are widely expressed in different human cell types and organs. It is therefore not surprising that aberrant expression and function of K2P channels are related to a spectrum of human diseases, including cancer, autoimmune, CNS, cardiovascular, and urinary tract disorders. Despite homologies in structure, expression, and stimulus, the functional diversity of K2P channels leads to heterogeneous influences on human diseases. The role of individual K2P channels in different disorders depends on expression patterns and modulation in cellular functions. However, an imbalance of potassium homeostasis and action potentials contributes to most disease pathologies. In this review, we provide an overview of current knowledge on the role of K2P channels in human diseases. We look at altered channel expression and function, the potential underlying molecular mechanisms, and prospective research directions in the field of K2P channels.
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Affiliation(s)
- Li-Ming Lee
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Münster, Germany
| | - Thomas Müntefering
- Department of Neurology, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Thomas Budde
- Institute of Physiology I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Sven G Meuth
- Department of Neurology, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Tobias Ruck
- Department of Neurology, University Hospital Düsseldorf, Düsseldorf, Germany,
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24
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Park S, Flüthmann P, Wolany C, Goedecke L, Spenner HM, Budde T, Pape HC, Jüngling K. Neuropeptide S Receptor Stimulation Excites Principal Neurons in Murine Basolateral Amygdala through a Calcium-Dependent Decrease in Membrane Potassium Conductance. Pharmaceuticals (Basel) 2021; 14:ph14060519. [PMID: 34072275 PMCID: PMC8230190 DOI: 10.3390/ph14060519] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 05/18/2021] [Accepted: 05/18/2021] [Indexed: 02/08/2023] Open
Abstract
Background: The neuropeptide S system, consisting of the 20 amino acid neuropeptide NPS and its G-protein-coupled receptor (GPCR) neuropeptide S receptor 1 (NPSR1), has been studied intensively in rodents. Although there is a lot of data retrieved from behavioral studies using pharmacology or genetic interventions, little is known about intracellular signaling cascades in neurons endogenously expressing the NPSR1. Methods: To elucidate possible G-protein-dependent signaling and effector systems, we performed whole-cell patch-clamp recordings on principal neurons of the anterior basolateral amygdala of mice. We used pharmacological interventions to characterize the NPSR1-mediated current induced by NPS application. Results: Application of NPS reliably evokes inward-directed currents in amygdalar neurons recorded in brain slice preparations of male and female mice. The NPSR1-mediated current had a reversal potential near the potassium reversal potential (EK) and was accompanied by an increase in membrane input resistance. GDP-β-S and BAPTA, but neither adenylyl cyclase inhibition nor 8-Br-cAMP, abolished the current. Intracellular tetraethylammonium or 4-aminopyridine reduced the NPS-evoked current. Conclusion: NPSR1 activation in amygdalar neurons inhibits voltage-gated potassium (K+) channels, most likely members of the delayed rectifier family. Intracellularly, Gαq signaling and calcium ions seem to be mandatory for the observed current and increased neuronal excitability.
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25
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Wachsmuth L, Datunashvili M, Kemper K, Albers F, Lambers H, Lüttjohann A, Kreitz S, Budde T, Faber C. Retrosplenial Cortex Contributes to Network Changes during Seizures in the GAERS Absence Epilepsy Rat Model. Cereb Cortex Commun 2021; 2:tgab023. [PMID: 34296168 PMCID: PMC8263073 DOI: 10.1093/texcom/tgab023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 03/15/2021] [Accepted: 03/16/2021] [Indexed: 11/14/2022] Open
Abstract
Resting state-fMRI was performed to explore brain networks in Genetic Absence Epilepsy Rats from Strasbourg and in nonepileptic controls (NEC) during monitoring of the brain state by simultaneous optical Ca2+-recordings. Graph theoretical analysis allowed for the identification of acute and chronic network changes and revealed preserved small world topology before and after seizure onset. The most prominent acute change in network organization during seizures was the segregation of cortical regions from the remaining brain. Stronger connections between thalamic with limbic regions compared with preseizure state indicated network regularization during seizures. When comparing between strains, intrathalamic connections were prominent in NEC, on local level represented by higher thalamic strengths and hub scores. Subtle differences were observed for retrosplenial cortex (RS), forming more connections beyond cortex in epileptic rats, and showing a tendency to lateralization during seizures. A potential role of RS as hub between subcortical and cortical regions in epilepsy was supported by increased numbers of parvalbumin-positive (PV+) interneurons together with enhanced inhibitory synaptic activity and neuronal excitability in pyramidal neurons. By combining multimodal fMRI data, graph theoretical methods, and electrophysiological recordings, we identified the RS as promising target for modulation of seizure activity and/or comorbidities.
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Affiliation(s)
- Lydia Wachsmuth
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Münster, 48149 Münster, Germany
| | - Maia Datunashvili
- Institute of Physiology I, University of Münster, 48149 Münster, Germany
| | - Katharina Kemper
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Münster, 48149 Münster, Germany
| | - Franziska Albers
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Münster, 48149 Münster, Germany
| | - Henriette Lambers
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Münster, 48149 Münster, Germany
| | - Annika Lüttjohann
- Institute of Physiology I, University of Münster, 48149 Münster, Germany
| | - Silke Kreitz
- Experimental and Clinical Pharmacology and Toxicology, University of Erlangen, 91054 Erlangen, Germany
| | - Thomas Budde
- Institute of Physiology I, University of Münster, 48149 Münster, Germany
| | - Cornelius Faber
- Translational Research Imaging Center, Clinic for Radiology, University Hospital Münster, 48149 Münster, Germany
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26
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Aulova KS, Urusov AE, Toporkova LB, Sedykh SE, Shevchenko YA, Tereshchenko VP, Sennikov SV, Budde T, Meuth SG, Orlovskaya IA, Nevinsky GA. Catalytic antibodies in the bone marrow and other organs of Th mice during spontaneous development of experimental autoimmune encephalomyelitis associated with cell differentiation. Mol Biol Rep 2021; 48:1055-1068. [PMID: 33595783 PMCID: PMC7925503 DOI: 10.1007/s11033-020-06117-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 12/20/2020] [Indexed: 10/25/2022]
Abstract
Exact mechanisms of autoimmune disease development are still yet unknown. However, it is known that the development of autoimmune diseases is associated with defects in the immune system, namely, the violation of the bone marrow hematopoietic stem cells (HSCs) differentiation profiles. Different characteristics of autoimmune reaction development in experimental autoimmune encephalomyelitis (EAE) prone Th mice characterizing T-lymphocytes response were analyzed using standard approaches. Profiles of several HSCs differentiation of bone marrow (BFU-E, CFU-E, CFU-GM, CFU-GEMM, T- and B-lymphocytes) of Th male and female mice during spontaneous development of EAE were noticeably different. Patterns of total lymphocytes, B- and T-cells proliferation in several different organs (bone marrow, blood, spleen, thymus, and lymph nodes) were also remarkably different. In addition, there were in time noticeable differences in their changes for some organs of male and female mice. Characters of changes in the profiles of CD4 and CD8 cells proliferation in some organs not always coincide with those for total T lymphocytes. The changes in the differentiation profiles of HSCs and the level of lymphocytes proliferation in the bone marrow and other organs were associated with the increase in the concentration of antibodies against DNA, myelin basic protein, and myelin oligodendrocyte glycoprotein, and catalytic antibodies hydrolyzing these substrates. Despite some differences in changes in the analyzed parameters, in general, the spontaneous development of EAE in male and female mice occurs to some extent in a comparable way.
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Affiliation(s)
- Kseniya S Aulova
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Andrey E Urusov
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Ludmila B Toporkova
- Institute of Clinical Immunology, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Sergey E Sedykh
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Yuliya A Shevchenko
- Institute of Clinical Immunology, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Valery P Tereshchenko
- Institute of Clinical Immunology, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Sergei V Sennikov
- Institute of Clinical Immunology, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Thomas Budde
- Institut Für Physiologie I, Westfälische Wilhelms-Universität, Robert-Koch-Str. 27a, 48149, Munster, Germany
| | - Sven G Meuth
- Department of Neurology, Westfälische Wilhelms-Universität, Albert-Schweitzer-Campus 1, 48149, Munster, Germany
| | - Irina A Orlovskaya
- Institute of Clinical Immunology, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Georgy A Nevinsky
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia.
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27
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Aulova KS, Urusov AA, Sedykh SE, Toporkova LB, Lopatnikova JA, Buneva VN, Sennikov SV, Budde T, Meuth SG, Popova NA, Orlovskaya IA, Nevinsky GA. The association between EAE development in mice and the production of autoantibodies and abzymes after immunization of mice with different antigens. J Cell Mol Med 2021; 25:2493-2504. [PMID: 33560578 PMCID: PMC7933958 DOI: 10.1111/jcmm.16183] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 11/25/2020] [Accepted: 11/30/2020] [Indexed: 12/16/2022] Open
Abstract
We have previously shown that immunization of C57BL/6 mice, prone to spontaneous development of experimental autoimmune encephalomyelitis (EAE), with three antigens (MOG35-55 , DNA-histone complex or DNA-methylated BSA complex), alters the differentiation profiles of bone marrow haematopoietic stem cells (HSCs). These are associated with the production of autoantibodies (auto-Abs) against these antigens and the formation of abzymes hydrolysing DNA, MOG, myelin basic protein (MBP) and histones. Immunization of mice with antigens accelerates the development of EAE. This work is the first to analyse the ratio of auto-Abs without and with catalytic activities at different stages of EAE development (onset, acute and remission phases) after immunization of mice with the three specific antigens. Prior to immunization and during spontaneous in-time development of EAE, the concentration of auto-Abs against MBP, MOG, histones and DNA and activities of IgG antibodies in the hydrolysis of substrates increased in parallel; correlation coefficients = +0.69-0.94. After immunization with MOG, DNA-histone complex or DNA-met-BSA complex, both positive (from +0.13 to +0.98) and negative correlations (from -0.09 to -0.69) were found between these values. Our study is the first showing that depending on the antigen, the relative amount of harmful auto-Abs without and abzymes with low or high catalytic activities may be produced only at onset and in acute or remission phases of EAE. The antigen governs the EAE development rate, whereby the ratio of auto-Abs without catalytic activity and with enzymatic activities of harmful abzymes hydrolysing MBP, MOG, histones and DNA varies strongly between different disease phases.
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Affiliation(s)
- Kseniya S Aulova
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Andrey A Urusov
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Sergey E Sedykh
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Ludmila B Toporkova
- Institute of Clinical Immunology, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Julia A Lopatnikova
- Institute of Clinical Immunology, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Valentina N Buneva
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Sergei V Sennikov
- Institute of Clinical Immunology, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Thomas Budde
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Sven G Meuth
- Department of Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Nelly A Popova
- Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Irina A Orlovskaya
- Institute of Clinical Immunology, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
| | - Georgy A Nevinsky
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
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28
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Fernández-Orth J, Rolfes L, Gola L, Bittner S, Andronic J, Sukhorukov VL, Sisario D, Landgraf P, Dieterich DC, Cerina M, Smalla KH, Kähne T, Budde T, Kovac S, Ruck T, Sauer M, Meuth SG. A role for TASK2 channels in the human immunological synapse. Eur J Immunol 2020; 51:342-353. [PMID: 33169379 DOI: 10.1002/eji.201948269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 08/30/2020] [Accepted: 11/05/2019] [Indexed: 12/29/2022]
Abstract
The immunological synapse is a transient junction that occurs when the plasma membrane of a T cell comes in close contact with an APC after recognizing a peptide from the antigen-MHC. The interaction starts when CRAC channels embedded in the T cell membrane open, flowing calcium ions into the cell. To counterbalance the ion influx and subsequent depolarization, Kv 1.3 and KCa3.1 channels are recruited to the immunological synapse, increasing the extracellular K+ concentration. These processes are crucial as they initiate gene expression that drives T cell activation and proliferation. The T cell-specific function of the K2P channel family member TASK2 channels and their role in autoimmune processes remains unclear. Using mass spectrometry analysis together with epifluorescence and super-resolution single-molecule localization microscopy, we identified TASK2 channels as novel players recruited to the immunological synapse upon stimulation. TASK2 localizes at the immunological synapse, upon stimulation with CD3 antibodies, likely interacting with these molecules. Our findings suggest that, together with Kv 1.3 and KCa3.1 channels, TASK2 channels contribute to the proper functioning of the immunological synapse, and represent an interesting treatment target for T cell-mediated autoimmune disorders.
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Affiliation(s)
| | - Leoni Rolfes
- Department of Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Lukas Gola
- Department of Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Stefan Bittner
- Department of Neurology, University Medical Center, Johannes Gutenberg-University, Mainz, Germany
| | - Joseph Andronic
- Department of Biotechnology and Biophysics, Biocenter, Julius-Maximilians-University Würzburg, Würzburg, Germany
| | - Vladimir L Sukhorukov
- Department of Biotechnology and Biophysics, Biocenter, Julius-Maximilians-University Würzburg, Würzburg, Germany
| | - Dmitri Sisario
- Department of Biotechnology and Biophysics, Biocenter, Julius-Maximilians-University Würzburg, Würzburg, Germany
| | - Peter Landgraf
- Neural Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University, Magdeburg, Germany
| | - Daniela C Dieterich
- Neural Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University, Magdeburg, Germany.,Center for Behavioral Brain Sciences (CBBS), Magdeburg, Germany
| | - Manuela Cerina
- Department of Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Karl-Heinz Smalla
- Special Lab Molecular Biological Techniques, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Thilo Kähne
- Institute of Experimental Internal Medicine, Medical Faculty, Otto-von-Guericke-University, Magdeburg, Germany
| | - Thomas Budde
- Institute of Physiology I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Stjepana Kovac
- Department of Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Tobias Ruck
- Department of Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Markus Sauer
- Department of Biotechnology and Biophysics, Biocenter, Julius-Maximilians-University Würzburg, Würzburg, Germany
| | - Sven G Meuth
- Department of Neurology, Westfälische Wilhelms-Universität, Münster, Germany
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Brömmel K, Maskri S, Bulk E, Pethő Z, Rieke M, Budde T, Koch O, Schwab A, Wünsch B. Co-staining of K Ca 3.1 Channels in NSCLC Cells with a Small-Molecule Fluorescent Probe and Antibody-Based Indirect Immunofluorescence. ChemMedChem 2020; 15:2462-2469. [PMID: 33043595 PMCID: PMC7756743 DOI: 10.1002/cmdc.202000652] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 09/21/2020] [Indexed: 01/01/2023]
Abstract
The Ca2+ activated potassium channel 3.1 (KCa 3.1) is involved in critical steps of the metastatic cascade, such as proliferation, migration, invasion and extravasation. Therefore, a fast and efficient protocol for imaging of KCa 3.1 channels was envisaged. The novel fluorescently labeled small molecule imaging probes 1 and 2 were synthesized by connecting a dimethylpyrrole-based BODIPY dye with a derivative of the KCa 3.1 channel inhibitor senicapoc via linkers of different length. Patch-clamp experiments revealed the inhibition of KCa 3.1 channels by the probes confirming interaction with the channel. Both probes 1 and 2 were able to stain KCa 3.1 channels in non-small-cell lung cancer (NSCLC) cells following a simple, fast and efficient protocol. Pre-incubation with unlabeled senicapoc removed the punctate staining pattern showing the specificity of the new probes 1 and 2. Staining of the channel with the fluorescently labeled senicapoc derivatives 1 or 2 or with antibody-based indirect immunofluorescence yielded identical or very similar densities of stained KCa 3.1 channels. However, co-staining using both methods did not lead to the expected overlapping punctate staining pattern. This observation was explained by docking studies showing that the antibody used for indirect immunofluorescence and the probes 1 and 2 label different channel populations. Whereas the antibody binds at the closed channel conformation, the probes 1 and 2 bind within the open channel.
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Affiliation(s)
- Kathrin Brömmel
- Institute for Pharmaceutical and Medicinal ChemistryWestphalian Wilhelms-University MünsterCorrensstraße 4848149MünsterGermany
- Cells-in-Motion Interfaculty CenterWestphalian Wilhelms-University MünsterWaldeyerstraße 1584149MünsterGermany
| | - Sarah Maskri
- Institute for Pharmaceutical and Medicinal ChemistryWestphalian Wilhelms-University MünsterCorrensstraße 4848149MünsterGermany
| | - Etmar Bulk
- Institute for Physiology IIUniversity Hospital MünsterRobert-Koch-Straße 27b48149MünsterGermany
| | - Zoltan Pethő
- Institute for Physiology IIUniversity Hospital MünsterRobert-Koch-Straße 27b48149MünsterGermany
| | - Marius Rieke
- Institute for Physiology IIUniversity Hospital MünsterRobert-Koch-Straße 27b48149MünsterGermany
| | - Thomas Budde
- Institute for Physiology IUniversity Hospital MünsterRobert-Koch-Straße 27a48149MünsterGermany
- Cells-in-Motion Interfaculty CenterWestphalian Wilhelms-University MünsterWaldeyerstraße 1584149MünsterGermany
| | - Oliver Koch
- Institute for Pharmaceutical and Medicinal ChemistryWestphalian Wilhelms-University MünsterCorrensstraße 4848149MünsterGermany
| | - Albrecht Schwab
- Institute for Physiology IIUniversity Hospital MünsterRobert-Koch-Straße 27b48149MünsterGermany
- Cells-in-Motion Interfaculty CenterWestphalian Wilhelms-University MünsterWaldeyerstraße 1584149MünsterGermany
| | - Bernhard Wünsch
- Institute for Pharmaceutical and Medicinal ChemistryWestphalian Wilhelms-University MünsterCorrensstraße 4848149MünsterGermany
- Cells-in-Motion Interfaculty CenterWestphalian Wilhelms-University MünsterWaldeyerstraße 1584149MünsterGermany
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Herrmann AM, Cerina M, Bittner S, Meuth SG, Budde T. Intracellular fluoride influences TASK mediated currents in human T cells. J Immunol Methods 2020; 487:112875. [PMID: 33031794 DOI: 10.1016/j.jim.2020.112875] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Revised: 08/14/2020] [Accepted: 10/01/2020] [Indexed: 10/23/2022]
Abstract
The expression of Kv1.3 and KCa channels in human T cells is essential for maintaining cell activation, proliferation and migration during an inflammatory response. Recently, an additional residual current, sensitive to anandamide and A293, compounds specifically inhibiting currents mediated by TASK channels, was observed after complete pharmacological blockade of Kv1.3 and KCa channels. This finding was not consistently observed throughout different studies and, an in-depth review of the different recording conditions used for the electrophysiological analysis of K+ currents in T cells revealed fluoride as major anionic component of the pipette intracellular solutions in the initial studies. While fluoride is frequently used to stabilize electrophysiological recordings, it is known as G-protein activator and to influence the intracellular Ca2+ concentration, which are mechanisms known to modulate TASK channel functioning. Therefore, we systemically addressed different fluoride- and chloride-based pipette solutions in whole-cell patch-clamp experiments in human T cells and used specific blockers to identify membrane currents carried by TASK and Kv1.3 channels. We found that fluoride increased the decay time constant of K+ outward currents, reduced the degree of the sustained current component and diminished the effect of the specific TASK channels blocker A293. These findings indicate that the use of fluoride-based pipette solutions may hinder the identification of a functional TASK channel component in electrophysiological experiments.
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Affiliation(s)
- Alexander M Herrmann
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany.
| | - Manuela Cerina
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany
| | - Stefan Bittner
- Department of Neurology, University of Mainz, Mainz, Germany
| | - Sven G Meuth
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany
| | - Thomas Budde
- Institute of Physiology I, Westfälische-Wilhems Universität Münster, Münster, Germany.
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Kälsch H, Mahabadi AA, Moebus S, Reinsch N, Budde T, Hoffmann B, Stang A, Jöckel KH, Erbel R, Lehmann N. Association of progressive thoracic aortic calcification with future cardiovascular events and all-cause mortality: ability to improve risk prediction? Results of the Heinz Nixdorf Recall (HNR) study. Eur Heart J Cardiovasc Imaging 2020; 20:709-717. [PMID: 30508179 DOI: 10.1093/ehjci/jey173] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 11/16/2016] [Indexed: 11/12/2022] Open
Abstract
AIMS Thoracic aortic calcification (TAC) is measured by computed tomography (CT). We investigated the association of TAC-progression with incident cardiovascular (CV) events and all-cause mortality in a population-based cohort and to determine its predictive value for these endpoints. METHODS AND RESULTS In 3080 participants (45-74 years, 53.6% women), risk factors and TAC via CT were measured at baseline and at a second examination after 5.1 ± 0.3 years. Hard coronary, hard CV events as well as CV events including revascularization and all-cause mortality were recorded during a follow-up time of 7.8 ± 2.2 years after the second CT scan. Cox regression analysis determined the association of TAC-progression with observed endpoints. The predictive value of TAC-progression was assessed using Harrell's C index. We observed 81 hard coronary, 154 hard CV, 231 CV events including revascularization, and 266 deaths. In the crude analysis, event rates increased continuously with the level of TAC-change over 5 years for all endpoints. After adjustment, the significant association of TAC-progression with hard CV events [hazard ratio (HR) 1.28, 95% confidence interval (CI) 1.05-1.57] and all-cause mortality (HR 1.34, 95% CI 1.14-1.58) persisted, per one standard deviation increase in TAC-progression (log(TAC + 1)). Regarding aortic segments separately, HRs were consistently higher for descending thoracic aorta. When adding TAC (baseline and progression) to the model containing classical risk factors and coronary artery calcification (CAC), Harrell's C indices did not increase for any of the observed endpoints. CONCLUSION TAC-progression is associated with incident hard CV events and all-cause mortality but fails to improve event prediction over CAC.
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Affiliation(s)
- Hagen Kälsch
- Department of Cardiology, Alfried Krupp Krankenhaus, Alfried-Krupp-Str. 21, Essen, Germany.,University of Witten/Herdecke, Department of Health, Alfred-Herrhausen-Straße 50, Witten, Germany
| | - Amir A Mahabadi
- Department of Cardiology and Vascular Medicine, West-German Heart and Vascular Center Essen, University Duisburg-Essen, Holsterhauser Str. 55, Essen, Germany
| | - Susanne Moebus
- Institute of Medical Informatics, Biometry, and Epidemiology, University Duisburg-Essen, Holsterhauser Str. 55, Essen, Germany
| | - Nico Reinsch
- University of Witten/Herdecke, Department of Health, Alfred-Herrhausen-Straße 50, Witten, Germany.,Department of Electrophysiology, Alfried Krupp Krankenhaus, Alfried-Krupp-Str. 21, Essen, Germany
| | - Thomas Budde
- Department of Cardiology, Alfried Krupp Krankenhaus, Alfried-Krupp-Str. 21, Essen, Germany
| | - Barbara Hoffmann
- Institute for Occupational, Social and Environmental Medicine, Centre for Health and Society, Medical Faculty, University of Düsseldorf, Gurlittstr. 55 / II, 40223 Düsseldorf, Germany
| | - Andreas Stang
- Institute of Medical Informatics, Biometry, and Epidemiology, University Duisburg-Essen, Holsterhauser Str. 55, Essen, Germany
| | - Karl-Heinz Jöckel
- Institute of Medical Informatics, Biometry, and Epidemiology, University Duisburg-Essen, Holsterhauser Str. 55, Essen, Germany
| | - Raimund Erbel
- Institute of Medical Informatics, Biometry, and Epidemiology, University Duisburg-Essen, Holsterhauser Str. 55, Essen, Germany
| | - Nils Lehmann
- Institute of Medical Informatics, Biometry, and Epidemiology, University Duisburg-Essen, Holsterhauser Str. 55, Essen, Germany
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Zamani M, Budde T, Bozorgi H. Intracerebroventricular administration of N-type calcium channel blocker ziconotide displays anticonvulsant, anxiolytic, and sedative effects in rats: A preclinical and pilot study. Epilepsy Behav 2020; 111:107251. [PMID: 32593873 DOI: 10.1016/j.yebeh.2020.107251] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 05/01/2020] [Accepted: 06/08/2020] [Indexed: 12/13/2022]
Abstract
OBJECTIVE Ziconotide (ω-conotoxin MVIIA peptide) is a novel analgesic agent acting on voltage-gated calcium channels and is administered intrathecally for neuropathic pain. While antiepileptic activities of other types of calcium channel blockers (T- or L-type) are well established, there is no information regarding the effect of ziconotide as an N-type calcium channel antagonist in pentylenetetrazol-induced seizures or its anxiolytic and sedative activities. The present study is the first to report on these effects. METHODS To evaluate the anticonvulsant activity of ziconotide in the pentylenetetrazol (60 mg/kg) seizure model, ziconotide was administered intracerebroventricular (i.c.v.) as a single dose (1 μg/rat) or repeatedly (chronic administration: 0.1, 0.3, or 1 μg/rat once a day for seven days). The anxiolytic and sedative actions of ziconotide were evaluated with the elevated plus maze, light/dark (LD) box, and pentobarbital-induced sleep tests. Immediately after behavioral testing, the amygdala was completely removed bilaterally to determine corticosterone levels by immunoassay. RESULTS In all dosing regimens, ziconotide significantly decreased the seizure frequency and also delayed the latency period compared with control. Chronic administration affected the percentage of mortality protection, while a single dose of ziconotide did not. In behavioral tests, ziconotide significantly increased both the number of entries and the percentage of time spent in the open arms of the elevated plus maze. Furthermore, ziconotide significantly increased the latency period and the number of entries into the light compartment during the LD box examination. Chronic administration of ziconotide significantly reduced the latency to sleep and increased sleeping time, whereas these parameters were not affected by a single dose. Additionally, amygdala corticosterone levels were significantly decreased in rats treated with ziconotide compared with control. CONCLUSION Ziconotide displays beneficial neurobehavioral effects in a model of epilepsy with anxiety as its comorbid event. It seems that at least one of the mechanisms involved in these effects is associated with a decrease in brain corticosterone levels. The main advantage of ziconotide over benzodiazepines (routine anxiolytic and sedative drugs) is that it does not cause tolerance, dependency, and addiction. Therefore, more than ever, it is necessary to improve the convenience of drug delivery protocols and attenuate the adverse effects associated with ziconotide-based therapies.
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Affiliation(s)
- Melika Zamani
- Department of Pharmacology, School of Pharmacy, Pharmaceutical Sciences Branch, Islamic Azad University, Tehran, Iran
| | - Thomas Budde
- Institute of Physiology I, Westfälische Wilhelms-University, Münster, Germany
| | - Hooman Bozorgi
- Department of Pharmacology, Research Center of Physiology, School of Medicine, Semnan University of Medical Sciences, Semnan, Iran.
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Cerina M, Muthuraman M, Gallus M, Koirala N, Dik A, Wachsmuth L, Hundehege P, Schiffler P, Tenberge JG, Fleischer V, Gonzalez-Escamilla G, Narayanan V, Krämer J, Faber C, Budde T, Groppa S, Meuth SG. Myelination- and immune-mediated MR-based brain network correlates. J Neuroinflammation 2020; 17:186. [PMID: 32532336 PMCID: PMC7293122 DOI: 10.1186/s12974-020-01827-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 04/24/2020] [Indexed: 11/23/2022] Open
Abstract
Background Multiple sclerosis (MS) is an autoimmune disease of the central nervous system (CNS), characterized by inflammatory and neurodegenerative processes. Despite demyelination being a hallmark of the disease, how it relates to neurodegeneration has still not been completely unraveled, and research is still ongoing into how these processes can be tracked non-invasively. Magnetic resonance imaging (MRI) derived brain network characteristics, which closely mirror disease processes and relate to functional impairment, recently became important variables for characterizing immune-mediated neurodegeneration; however, their histopathological basis remains unclear. Methods In order to determine the MRI-derived correlates of myelin dynamics and to test if brain network characteristics derived from diffusion tensor imaging reflect microstructural tissue reorganization, we took advantage of the cuprizone model of general demyelination in mice and performed longitudinal histological and imaging analyses with behavioral tests. By introducing cuprizone into the diet, we induced targeted and consistent demyelination of oligodendrocytes, over a period of 5 weeks. Subsequent myelin synthesis was enabled by reintroduction of normal food. Results Using specific immune-histological markers, we demonstrated that 2 weeks of cuprizone diet induced a 52% reduction of myelin content in the corpus callosum (CC) and a 35% reduction in the neocortex. An extended cuprizone diet increased myelin loss in the CC, while remyelination commenced in the neocortex. These histologically determined dynamics were reflected by MRI measurements from diffusion tensor imaging. Demyelination was associated with decreased fractional anisotropy (FA) values and increased modularity and clustering at the network level. MRI-derived modularization of the brain network and FA reduction in key anatomical regions, including the hippocampus, thalamus, and analyzed cortical areas, were closely related to impaired memory function and anxiety-like behavior. Conclusion Network-specific remyelination, shown by histology and MRI metrics, determined amelioration of functional performance and neuropsychiatric symptoms. Taken together, we illustrate the histological basis for the MRI-driven network responses to demyelination, where increased modularity leads to evolving damage and abnormal behavior in MS. Quantitative information about in vivo myelination processes is mirrored by diffusion-based imaging of microstructural integrity and network characteristics.
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Affiliation(s)
- Manuela Cerina
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany
| | - Muthuraman Muthuraman
- Movement Disorders, Imaging and Neurostimulation, Biomedical Statistics and Multimodal Signal Processing Unit, Department of Neurology, University Medical Center of the Johannes Gutenberg University, Mainz, Germany.
| | - Marco Gallus
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany
| | - Nabin Koirala
- Movement Disorders, Imaging and Neurostimulation, Biomedical Statistics and Multimodal Signal Processing Unit, Department of Neurology, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
| | - Andre Dik
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany
| | - Lydia Wachsmuth
- Departement of Radiology, University of Münster, Münster, Langenbeckstrasse 1, 55131, Mainz, Germany
| | - Petra Hundehege
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany
| | - Patrick Schiffler
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany
| | - Jan-Gerd Tenberge
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany
| | - Vinzenz Fleischer
- Movement Disorders, Imaging and Neurostimulation, Biomedical Statistics and Multimodal Signal Processing Unit, Department of Neurology, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
| | - Gabriel Gonzalez-Escamilla
- Movement Disorders, Imaging and Neurostimulation, Biomedical Statistics and Multimodal Signal Processing Unit, Department of Neurology, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
| | - Venu Narayanan
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany
| | - Julia Krämer
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany
| | - Cornelius Faber
- Departement of Radiology, University of Münster, Münster, Langenbeckstrasse 1, 55131, Mainz, Germany
| | - Thomas Budde
- Institute of Physiology I, University of Münster, Münster, Germany
| | - Sergiu Groppa
- Movement Disorders, Imaging and Neurostimulation, Biomedical Statistics and Multimodal Signal Processing Unit, Department of Neurology, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
| | - Sven G Meuth
- Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany
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Gronewold J, Kropp R, Lehmann N, Stang A, Mahabadi AA, Kälsch H, Weimar C, Dichgans M, Budde T, Moebus S, Jöckel KH, Erbel R, Hermann DM. Cardiovascular Risk and Atherosclerosis Progression in Hypertensive Persons Treated to Blood Pressure Targets. Hypertension 2019; 74:1436-1447. [DOI: 10.1161/hypertensionaha.119.13827] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Arterial hypertension promotes atherosclerosis and cardiovascular events. We evaluated how cardiovascular risk and atherosclerosis progression are associated with blood pressure, antihypertensive treatment, and treatment efficacy. In 3555 participants of the population-based Heinz Nixdorf Recall study without previous cardiovascular disease (mean±SD; age, 58.9±7.6 years, 46.9% men), we analyzed associations of baseline antihypertensive treatment efficacy (normotension without antihypertensives, normotension with antihypertensives, hypertension without antihypertensives, hypertension with antihypertensives, based on 140/90 mmHg cutoffs) with incident coronary artery calcification (CAC) and CAC progression during 5-year-follow-up and with incident cardiovascular events during 13.5-year-follow-up. We further evaluated associations of incident arterial hypertension and efficacy of new antihypertensive treatment at the 5-year-follow-up with subsequent cardiovascular events. At baseline, 1706 participants had normotension without antihypertensives, 553 normotension with antihypertensives, 786 hypertension without antihypertensives, and 510 hypertension with antihypertensives. Six hundred forty-seven participants experienced rapid CAC progression. One hundred seven, 132, and 249 had incident stroke, coronary event, and cardiovascular event, respectively. Compared with normotensives without antihypertensives, normotensives with antihypertensives had an elevated stroke (hazard ratio, 2.33 [95% CI, 1.19–4.55]), coronary (2.04 [95% CI, 1.20–3.45]), and cardiovascular (2.23 [95% CI, 1.48–3.36]) risk, and increased baseline CAC, but not increased CAC progression. Participants without hypertension at baseline, who were newly hypertensive but achieved normotension with antihypertensives at the 5-year-follow-up, again exhibited elevated stroke (4.80 [95% CI, 1.38–16.70]) and cardiovascular (2.99 [95% CI, 1.25–7.16]) risk, whereas coronary risk was less elevated (2.24 [95% CI, 0.70–7.18]). Normotensives with antihypertensives have an elevated cardiovascular risk. They are characterized by elevated baseline CAC but show no signs of increased CAC progression.
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Affiliation(s)
- Janine Gronewold
- From the Department of Neurology, University Hospital Essen, Germany (J.G., R.K., C.W., D.M.H.)
| | - Rene Kropp
- From the Department of Neurology, University Hospital Essen, Germany (J.G., R.K., C.W., D.M.H.)
| | - Nils Lehmann
- Institute for Medical Informatics, Biometry and Epidemiology, University Hospital Essen, University Duisburg-Essen, Germany (N.L., S.M., K.-H.J., R.E.)
| | - Andreas Stang
- Center of Clinical Epidemiology, Institute for Medical Informatics, Biometry and Epidemiology, Medical Faculty, University Duisburg-Essen, Germany (A.S.)
- School of Public Health, Department of Epidemiology, Boston University (A.S.)
| | - Amir A. Mahabadi
- Department of Cardiology and Vascular Medicine, University Hospital Essen, Germany (A.A.M.)
| | - Hagen Kälsch
- Clinic of Cardiology, Alfried Krupp Hospital, Essen, Germany (H.K., T.B.)
- Department of Medicine, Faculty of Health, University Witten-Herdecke, Germany (H.K.)
| | - Christian Weimar
- From the Department of Neurology, University Hospital Essen, Germany (J.G., R.K., C.W., D.M.H.)
| | - Martin Dichgans
- Institute for Stroke and Dementia Research, University Hospital, Ludwig-Maximilians-Universität LMU, Munich, Germany (M.D.)
- Munich Cluster of Systems Neurology (SyNergy), Germany (M.D.)
| | - Thomas Budde
- Clinic of Cardiology, Alfried Krupp Hospital, Essen, Germany (H.K., T.B.)
| | - Susanne Moebus
- Institute for Medical Informatics, Biometry and Epidemiology, University Hospital Essen, University Duisburg-Essen, Germany (N.L., S.M., K.-H.J., R.E.)
| | - Karl-Heinz Jöckel
- Institute for Medical Informatics, Biometry and Epidemiology, University Hospital Essen, University Duisburg-Essen, Germany (N.L., S.M., K.-H.J., R.E.)
| | - Raimund Erbel
- Institute for Medical Informatics, Biometry and Epidemiology, University Hospital Essen, University Duisburg-Essen, Germany (N.L., S.M., K.-H.J., R.E.)
| | - Dirk M. Hermann
- From the Department of Neurology, University Hospital Essen, Germany (J.G., R.K., C.W., D.M.H.)
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Schreiber JA, Schepmann D, Frehland B, Thum S, Datunashvili M, Budde T, Hollmann M, Strutz-Seebohm N, Wünsch B, Seebohm G. A common mechanism allows selective targeting of GluN2B subunit-containing N-methyl-D-aspartate receptors. Commun Biol 2019; 2:420. [PMID: 31754650 PMCID: PMC6858350 DOI: 10.1038/s42003-019-0645-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 09/24/2019] [Indexed: 01/24/2023] Open
Abstract
N-methyl-D-aspartate receptors (NMDARs), especially GluN2B-containing NMDARs, are associated with neurodegenerative diseases like Parkinson, Alzheimer and Huntington based on their high Ca2+ conductivity. Overactivation leads to high intracellular Ca2+ concentrations and cell death rendering GluN2B-selective inhibitors as promising drug candidates. Ifenprodil represents the first highly potent prototypical, subtype-selective inhibitor of GluN2B-containing NMDARs. However, activity of ifenprodil on serotonergic, adrenergic and sigma receptors limits its therapeutic use. Structural reorganization of the ifenprodil scaffold to obtain 3-benzazepines retained inhibitory GluN2B activity but decreased the affinity at the mentioned non-NMDARs. While scaffold optimization improves the selectivity, the molecular inhibitory mechanism of these compounds is still not known. Here, we show a common inhibitory mechanism of ifenprodil and the related 3-benzazepines by mutational modifications of the receptor binding site, chemical modifications of the 3-benzazepine scaffold and subsequent in silico simulation of the inhibitory mechanism.
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Affiliation(s)
- Julian A. Schreiber
- Institute of Pharmaceutical and Medicinal Chemistry, University of Münster, Corrensstr. 48, D-48149 Münster, Germany
| | - Dirk Schepmann
- Institute of Pharmaceutical and Medicinal Chemistry, University of Münster, Corrensstr. 48, D-48149 Münster, Germany
| | - Bastian Frehland
- Institute of Pharmaceutical and Medicinal Chemistry, University of Münster, Corrensstr. 48, D-48149 Münster, Germany
| | - Simone Thum
- Institute of Pharmaceutical and Medicinal Chemistry, University of Münster, Corrensstr. 48, D-48149 Münster, Germany
| | - Maia Datunashvili
- Institute of Physiology I, University of Münster, Robert-Koch-Str. 27a, D-48149 Münster, Germany
| | - Thomas Budde
- Institute of Physiology I, University of Münster, Robert-Koch-Str. 27a, D-48149 Münster, Germany
- Cells-in-Motion Cluster of Excellence (EXC 1003 - CiM), University Münster, Münster, Germany
| | - Michael Hollmann
- Department of Biochemistry I - Receptor Biochemistry, Ruhr University Bochum, Universitätsstr. 150, D-44801 Bochum, Germany
| | - Nathalie Strutz-Seebohm
- Cellular Electrophysiology and Molecular Biology, Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, Robert-Koch-Str. 45, D-48149 Münster, Germany
| | - Bernhard Wünsch
- Institute of Pharmaceutical and Medicinal Chemistry, University of Münster, Corrensstr. 48, D-48149 Münster, Germany
- Cells-in-Motion Cluster of Excellence (EXC 1003 - CiM), University Münster, Münster, Germany
| | - Guiscard Seebohm
- Cellular Electrophysiology and Molecular Biology, Institute for Genetics of Heart Diseases (IfGH), Department of Cardiovascular Medicine, University Hospital Münster, Robert-Koch-Str. 45, D-48149 Münster, Germany
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36
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van Alst TM, Wachsmuth L, Datunashvili M, Albers F, Just N, Budde T, Faber C. Anesthesia differentially modulates neuronal and vascular contributions to the BOLD signal. Neuroimage 2019; 195:89-103. [DOI: 10.1016/j.neuroimage.2019.03.057] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 03/06/2019] [Accepted: 03/25/2019] [Indexed: 11/27/2022] Open
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Hennig F, Moebus S, Reinsch N, Budde T, Erbel R, Jöckel KH, Lehmann N, Hoffmann B, Kälsch H. Investigation of air pollution and noise on progression of thoracic aortic calcification: results of the Heinz Nixdorf Recall Study. Eur J Prev Cardiol 2019; 27:965-974. [PMID: 31189380 PMCID: PMC7272124 DOI: 10.1177/2047487319854818] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Aims Air pollution and noise are potential risk factors for subclinical
atherosclerosis. Longitudinal analyses, especially on the interplay of these
environmental factors, are scarce and inconsistent. Hence we investigated
long-term traffic-related exposure to air pollution and noise with the
development and progression of thoracic aortic calcification, a marker of
subclinical atherosclerosis. Methods We used baseline (2000–2003) and follow-up (2006–2008) data from the German
Heinz Nixdorf Recall cohort study, including 4814 middle-aged adults.
Residence-based air pollution (PM2.5 (aerodynamic
diameter ≤ 2.5 µm), PM10, nitrogen dioxide and particle number),
and noise was assessed with dispersion models. Thoracic aortic calcification
was quantified from non-contrast enhanced electron beam computed tomography.
The presence and extent of thoracic aortic calcification progression were
analysed with multiple logistic and linear regression models, respectively,
adjusting for age, sex, lifestyle variables, socioeconomic status and
respective co-exposure. Results We observed no association in the full study sample
(n = 3155, mean age 59.1 (±7.6) years, 52.8% women). While
an interquartile range in particle number and night-time noise yielded odds
ratios of 1.20 (1.03, 1.40) and 1.21 (1.00, 1.46) for binary thoracic aortic
calcification progression, and 0.02 (–0.01, 0.05) and 0.04 (0.00, 0.07)
higher growth rates of thoracic aortic calcification in participants with
baseline thoracic aortic calcification less than 10, negative findings were
observed in those with baseline thoracic aortic calcification of 10 or
greater. Results were similar for other pollutants and daytime noise. Conclusion Our study shows no overall associations. Subgroup analyses suggest
independent associations of traffic-related air pollution and noise with the
development and progression of subclinical atherosclerosis in participants
with no or minor thoracic aortic calcification at baseline, in contrast to
negative findings in those with advanced calcification.
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Affiliation(s)
- Frauke Hennig
- Institute of Occupational, Social and Environmental Medicine, Heinrich-Heine University Düsseldorf, Germany
| | - Susanne Moebus
- Institute of Medical Informatics, Biometry and Epidemiology, University of Duisburg-Essen, Germany
| | - Nico Reinsch
- Alfried Krupp Hospital Essen, Department of Cardiology, Germany.,Medical Department, University Witten/Herdecke, Germany
| | - Thomas Budde
- Alfried Krupp Hospital Essen, Department of Cardiology, Germany
| | - Raimund Erbel
- Institute of Medical Informatics, Biometry and Epidemiology, University of Duisburg-Essen, Germany
| | - Karl-Heinz Jöckel
- Institute of Medical Informatics, Biometry and Epidemiology, University of Duisburg-Essen, Germany
| | - Nils Lehmann
- Institute of Medical Informatics, Biometry and Epidemiology, University of Duisburg-Essen, Germany
| | - Barbara Hoffmann
- Institute of Occupational, Social and Environmental Medicine, Heinrich-Heine University Düsseldorf, Germany
| | - Hagen Kälsch
- Alfried Krupp Hospital Essen, Department of Cardiology, Germany.,Medical Department, University Witten/Herdecke, Germany
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38
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Langenbruch L, Krämer J, Güler S, Möddel G, Geßner S, Melzer N, Elger CE, Wiendl H, Budde T, Meuth SG, Kovac S. Seizures and epilepsy in multiple sclerosis: epidemiology and prognosis in a large tertiary referral center. J Neurol 2019; 266:1789-1795. [PMID: 31069528 DOI: 10.1007/s00415-019-09332-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Revised: 04/14/2019] [Accepted: 04/23/2019] [Indexed: 02/03/2023]
Abstract
BACKGROUND Seizures and epilepsy may substantially add to the burden of disease in multiple sclerosis (MS), whereas the exact prevalence and prognosis of seizures and epilepsy in patients with MS remains largely unknown. OBJECTIVES We aimed to investigate the epidemiology and prognosis of seizures and epilepsy in MS. METHODS We retrospectively analyzed a cohort of 4078 MS patients from a single tertiary referral clinic. RESULTS After excluding 37 patients with unconfirmed MS and alternative seizure etiologies, we found seizures attributable to MS in 1.5% and epilepsy in 0.9% of patients. 40.4% of patients with a follow-up of at least twelve months experienced only a single seizure and 59.6% had recurring seizures. 39% of patients with recurrent seizures were considered drug-resistant, with 9.7% experiencing status epilepticus. Seizure recurrence after a first seizure depended significantly on the MS subtype and was seen more often if the first seizure occurred simultaneously with a MS relapse than in the absence of a relapse. CONCLUSION Our study shows a lower number of seizures and epilepsy in MS than previously reported. While a single seizure in MS usually has a good prognosis, relapse-associated seizures and established epilepsy in MS may not be as benign as previously assumed.
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Affiliation(s)
- Lisa Langenbruch
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Germany
| | - Julia Krämer
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Germany
| | - Sati Güler
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Germany
| | - Gabriel Möddel
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Germany
| | - Sophia Geßner
- Institute of Medical Informatics, University of Münster, Albert-Schweitzer-Campus 1, Gebäude A11, 48149, Münster, Germany
| | - Nico Melzer
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Germany
| | - Christian E Elger
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Germany.,Beta Neurologie, Kompetenzzentrum für Epileptologie, Joseph-Schumpeter-Allee 15, 53277, Bonn, Germany.,Klinik für Neuropädiatrie, Charite, Berlin, Germany
| | - Heinz Wiendl
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Germany
| | - Thomas Budde
- Institute of Physiology I, University of Münster, Robert-Koch-Straße 27a, 48149, Münster, Germany
| | - Sven G Meuth
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Germany
| | - Stjepana Kovac
- Department of Neurology with Institute of Translational Neurology, University Hospital Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Germany.
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39
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Zobeiri M, Chaudhary R, Blaich A, Rottmann M, Herrmann S, Meuth P, Bista P, Kanyshkova T, Lüttjohann A, Narayanan V, Hundehege P, Meuth SG, Romanelli MN, Urbano FJ, Pape HC, Budde T, Ludwig A. The Hyperpolarization-Activated HCN4 Channel is Important for Proper Maintenance of Oscillatory Activity in the Thalamocortical System. Cereb Cortex 2019; 29:2291-2304. [PMID: 30877792 PMCID: PMC6458902 DOI: 10.1093/cercor/bhz047] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Revised: 02/15/2019] [Accepted: 02/21/2019] [Indexed: 11/14/2022] Open
Abstract
Hyperpolarization-activated cation channels are involved, among other functions, in learning and memory, control of synaptic transmission and epileptogenesis. The importance of the HCN1 and HCN2 isoforms for brain function has been demonstrated, while the role of HCN4, the third major neuronal HCN subunit, is not known. Here we show that HCN4 is essential for oscillatory activity in the thalamocortical (TC) network. HCN4 is selectively expressed in various thalamic nuclei, excluding the thalamic reticular nucleus. HCN4-deficient TC neurons revealed a massive reduction of Ih and strongly reduced intrinsic burst firing, whereas the current was normal in cortical pyramidal neurons. In addition, evoked bursting in a thalamic slice preparation was strongly reduced in the mutant mice probes. HCN4-deficiency also significantly slowed down thalamic and cortical oscillations during active wakefulness. Taken together, these results establish that thalamic HCN4 channels are essential for the production of rhythmic intrathalamic oscillations and determine regular TC oscillatory activity during alert states.
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Affiliation(s)
- Mehrnoush Zobeiri
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Rahul Chaudhary
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Anne Blaich
- Institut für Experimentelle und Klinische Pharmakologie und Toxikologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Matthias Rottmann
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Stefan Herrmann
- Institut für Experimentelle und Klinische Pharmakologie und Toxikologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Patrick Meuth
- Klinik für Neurologie mit Institut für Translationale Neurologie, Westfälische Wilhelms-Universität, Münster, Germany
| | - Pawan Bista
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Tatyana Kanyshkova
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Annika Lüttjohann
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Venu Narayanan
- Klinik für Neurologie mit Institut für Translationale Neurologie, Westfälische Wilhelms-Universität, Münster, Germany
| | - Petra Hundehege
- Klinik für Neurologie mit Institut für Translationale Neurologie, Westfälische Wilhelms-Universität, Münster, Germany
| | - Sven G Meuth
- Klinik für Neurologie mit Institut für Translationale Neurologie, Westfälische Wilhelms-Universität, Münster, Germany
| | - Maria Novella Romanelli
- Department of Neurosciences, Psychology, Drug Research and Child Health, University of Florence, Via Ugo Schiff 6, Sesto Fiorentino, Italy
| | | | - Hans-Christian Pape
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Thomas Budde
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Andreas Ludwig
- Institut für Experimentelle und Klinische Pharmakologie und Toxikologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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40
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Romanelli MN, Del Lungo M, Guandalini L, Zobeiri M, Gyökeres A, Árpádffy-Lovas T, Koncz I, Sartiani L, Bartolucci G, Dei S, Manetti D, Teodori E, Budde T, Cerbai E. EC18 as a Tool To Understand the Role of HCN4 Channels in Mediating Hyperpolarization-Activated Current in Tissues. ACS Med Chem Lett 2019; 10:584-589. [PMID: 30996800 DOI: 10.1021/acsmedchemlett.8b00587] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 02/06/2019] [Indexed: 12/31/2022] Open
Abstract
Hyperpolarization-activated cyclic nucleotide-gated (HCN) channels are membrane proteins encoded by four genes (HCN1-4) and widely distributed in the central and peripheral nervous system and in the heart. HCN channels are involved in several physiological functions, including the generation of rhythmic activity, and are considered important drug targets if compounds with isoform selectivity are developed. At present, however, few compounds are known, which are able to discriminate among HCN channel isoforms. The inclusion of the three-methylene chain of zatebradine into a cyclohexane ring gave a compound (3a) showing a 5-fold preference for HCN4 channels, and ability to selectively modulate Ih in different tissues. Compound 3a has been tested for its ability to reduce Ih and to interact with other ion channels in the heart and the central nervous system. Its preference for HCN4 channels makes this compound useful to elucidate the contribution of this isoform in the physiological and pathological processes involving hyperpolarization-activated current.
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Affiliation(s)
- Maria Novella Romanelli
- Department of Neurosciences, Psychology, Drug Research and Child Health (NeuroFarBa), University of Florence, Florence 50139, Italy
| | - Martina Del Lungo
- Department of Neurosciences, Psychology, Drug Research and Child Health (NeuroFarBa), University of Florence, Florence 50139, Italy
| | - Luca Guandalini
- Department of Neurosciences, Psychology, Drug Research and Child Health (NeuroFarBa), University of Florence, Florence 50139, Italy
| | - Mehrnoush Zobeiri
- Institute of Physiology I, Westfälische Wilhelms-University Münster, Münster 48149, Germany
| | - András Gyökeres
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Szeged H-6720, Hungary
| | - Tamás Árpádffy-Lovas
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Szeged H-6720, Hungary
| | - Istvan Koncz
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Szeged H-6720, Hungary
| | - Laura Sartiani
- Department of Neurosciences, Psychology, Drug Research and Child Health (NeuroFarBa), University of Florence, Florence 50139, Italy
| | - Gianluca Bartolucci
- Department of Neurosciences, Psychology, Drug Research and Child Health (NeuroFarBa), University of Florence, Florence 50139, Italy
| | - Silvia Dei
- Department of Neurosciences, Psychology, Drug Research and Child Health (NeuroFarBa), University of Florence, Florence 50139, Italy
| | - Dina Manetti
- Department of Neurosciences, Psychology, Drug Research and Child Health (NeuroFarBa), University of Florence, Florence 50139, Italy
| | - Elisabetta Teodori
- Department of Neurosciences, Psychology, Drug Research and Child Health (NeuroFarBa), University of Florence, Florence 50139, Italy
| | - Thomas Budde
- Institute of Physiology I, Westfälische Wilhelms-University Münster, Münster 48149, Germany
| | - Elisabetta Cerbai
- Department of Neurosciences, Psychology, Drug Research and Child Health (NeuroFarBa), University of Florence, Florence 50139, Italy
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Abstract
Sensory information processing and higher cognitive functions rely on the interactions between thalamus and cortex. Many types of neurological and psychiatric disorders are accompanied or driven by alterations in the brain connectivity. In this study, putative changes in functional and effective corticocortical (CC), thalamocortical (TC), and corticothalamic (CT) connectivity during wakefulness and slow-wave sleep (SWS) in a model of thalamocortical dysrhythmia, TRIP8b-/- mice, and in control (wild-type or WT) mice are described. Coherence and nonlinear Granger causality (GC) were calculated for twenty 10 s length epochs of SWS and active wakefulness (AW) of each animal. Coherence was reduced between 4 and ca 20 Hz in the cortex and between cortex and thalamus during SWS compared with AW in WT but not in TRIP8b-/- mice. Moreover, TRIP8b-/- mice showed lower CT coherence during AW compared with WT mice; these differences were no longer present during SWS. Unconditional GC analysis also showed sleep-related reductions in TC and CT couplings in WT mice, while TRIP8b-/- mice showed diminished wake and enhanced sleep CC coupling and rather strong CT-directed coupling during wake and sleep, although smaller during sleep. Conditional GC coupling analysis confirmed the diminished CC and enhanced CT coupling in TRIP8b-/- mice. Our findings indicate that altered properties of hyperpolarization-activated cyclic nucleotide-gated cation channels, characterizing TRIP8b-/- mice, have clear effects on CC, TC, and CT networks. A more complete understanding of the function of the altered communication within these networks awaits detailed phenotyping of TRIP8b-/- mice aimed at specifics of sensory and attentional processes.
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Affiliation(s)
- Mehrnoush Zobeiri
- 1 Institute of Physiology I (Neurophysiology), Wesfälische Wilhelms University, Münster, Germany
| | | | - Thomas Budde
- 1 Institute of Physiology I (Neurophysiology), Wesfälische Wilhelms University, Münster, Germany
| | - Ilya V Sysoev
- 3 Saratov State University, Saratov, Russia.,4 Saratov Branch of Kotel'nikov Institute of Radio Engineering and Electronics of RAS, Saratov, Russia
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42
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Amedonu E, Brenker C, Barman S, Schreiber JA, Becker S, Peischard S, Strutz-Seebohm N, Strippel C, Dik A, Hartung HP, Budde T, Wiendl H, Strünker T, Wünsch B, Goebels N, Meuth SG, Seebohm G, Melzer N. An Assay to Determine Mechanisms of Rapid Autoantibody-Induced Neurotransmitter Receptor Endocytosis and Vesicular Trafficking in Autoimmune Encephalitis. Front Neurol 2019; 10:178. [PMID: 30881339 PMCID: PMC6405626 DOI: 10.3389/fneur.2019.00178] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 02/11/2019] [Indexed: 02/01/2023] Open
Abstract
N-Methyl-D-aspartate (NMDA) receptors (NMDARs) are among the most important excitatory neurotransmitter receptors in the human brain. Autoantibodies to the human NMDAR cause the most frequent form of autoimmune encephalitis involving autoantibody-mediated receptor cross-linking and subsequent internalization of the antibody-receptor complex. This has been deemed to represent the predominant antibody effector mechanism depleting the NMDAR from the synaptic and extra-synaptic neuronal cell membrane. To assess in detail the molecular mechanisms of autoantibody-induced NMDAR endocytosis, vesicular trafficking, and exocytosis we transiently co-expressed rat GluN1-1a-EGFP and GluN2B-ECFP alone or together with scaffolding postsynaptic density protein 95 (PSD-95), wild-type (WT), or dominant-negative (DN) mutant Ras-related in brain (RAB) proteins (RAB5WT, RAB5DN, RAB11WT, RAB11DN) in HEK 293T cells. The cells were incubated with a pH-rhodamine-labeled human recombinant monoclonal GluN1 IgG1 autoantibody (GluN1-aAbpH−rhod) genetically engineered from clonally expanded intrathecal plasma cells from a patient with anti-NMDAR encephalitis, and the pH-rhodamine fluorescence was tracked over time. We show that due to the acidic luminal pH, internalization of the NMDAR-autoantibody complex into endosomes and lysosomes increases the pH-rhodamine fluorescence. The increase in fluorescence allows for mechanistic assessment of endocytosis, vesicular trafficking in these vesicular compartments, and exocytosis of the NMDAR-autoantibody complex under steady state conditions. Using this method, we demonstrate a role for PSD-95 in stabilization of NMDARs in the cell membrane in the presence of GluN1-aAbpH−rhod, while RAB proteins did not exert a significant effect on vertical trafficking of the internalized NMDAR autoantibody complex in this heterologous expression system. This novel assay allows to unravel molecular mechanisms of autoantibody-induced receptor internalization and to study novel small-scale specific molecular-based therapies for autoimmune encephalitis syndromes.
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Affiliation(s)
- Elsie Amedonu
- Myocellular Electrophysiology and Molecular Biology, Institute for Genetics of Heart Diseases, University of Muenster, Muenster, Germany.,Department of Neurology, University of Muenster, Muenster, Germany
| | - Christoph Brenker
- Centre of Reproductive Medicine and Andrology, University of Muenster, Muenster, Germany
| | - Sumanta Barman
- Department of Neurology, Universitätsklinikum and Center for Neurology and Neuropsychiatry LVR Klinikum, Heinrich Heine University Duesseldorf, Duesseldorf, Germany
| | - Julian A Schreiber
- Myocellular Electrophysiology and Molecular Biology, Institute for Genetics of Heart Diseases, University of Muenster, Muenster, Germany
| | - Sebastian Becker
- Myocellular Electrophysiology and Molecular Biology, Institute for Genetics of Heart Diseases, University of Muenster, Muenster, Germany
| | - Stefan Peischard
- Myocellular Electrophysiology and Molecular Biology, Institute for Genetics of Heart Diseases, University of Muenster, Muenster, Germany
| | - Nathalie Strutz-Seebohm
- Myocellular Electrophysiology and Molecular Biology, Institute for Genetics of Heart Diseases, University of Muenster, Muenster, Germany
| | | | - Andre Dik
- Department of Neurology, University of Muenster, Muenster, Germany
| | - Hans-Peter Hartung
- Department of Neurology, Universitätsklinikum and Center for Neurology and Neuropsychiatry LVR Klinikum, Heinrich Heine University Duesseldorf, Duesseldorf, Germany
| | - Thomas Budde
- Institute for Physiology I, University of Muenster, Muenster, Germany
| | - Heinz Wiendl
- Department of Neurology, University of Muenster, Muenster, Germany
| | - Timo Strünker
- Centre of Reproductive Medicine and Andrology, University of Muenster, Muenster, Germany
| | - Bernhard Wünsch
- Institute for Pharmaceutical and Medical Chemistry, University of Muenster, Muenster, Germany
| | - Norbert Goebels
- Department of Neurology, Universitätsklinikum and Center for Neurology and Neuropsychiatry LVR Klinikum, Heinrich Heine University Duesseldorf, Duesseldorf, Germany
| | - Sven G Meuth
- Department of Neurology, University of Muenster, Muenster, Germany
| | - Guiscard Seebohm
- Myocellular Electrophysiology and Molecular Biology, Institute for Genetics of Heart Diseases, University of Muenster, Muenster, Germany
| | - Nico Melzer
- Department of Neurology, University of Muenster, Muenster, Germany
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43
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Välimaa S, Perea-Lowery L, Smått JH, Peltonen J, Budde T, Vallittu PK. Grit blasted aggregates of hydroxyl apatite functionalized calcium carbonate in occluding dentinal tubules. Heliyon 2019; 4:e01049. [PMID: 30603691 PMCID: PMC6307103 DOI: 10.1016/j.heliyon.2018.e01049] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 09/03/2018] [Accepted: 12/11/2018] [Indexed: 11/26/2022] Open
Abstract
Objectives This study aimed to investigate the effects of using hydroxyl apatite functionalized calcium carbonate (FCC) particles on occluding dentinal tubules. Methods Dentine specimens extracted from eighteen human molars with exposed dentinal tubules were divided into three groups (n = 6/group): a) Cut surface with smear layer; b) EDTA (smear layer removed with 17% EDTA for 1 min); and c) Grit blasted functionalized calcium carbonate (FCC) with and air pressure of 280 kPa. Microscopic dentinal tubule occlusion, tubule diameter and tubule area were evaluated using scanning electron microscopy (SEM) before and after grit blasting. Biomineralization of specimens was carried out in a simulated body fluid (SBF). Elemental analysis of occluding materials was carried out using energy-dispersive X-ray spectroscopy (EDX). X-ray diffraction (XRD) analysis was performed to demonstrate the crystal structure of the biomineralized layer on dentine. Results FCC particles showed penetration into the dentinal tubules by breakage of their original particle shape and size. EDTA treated surface had higher number and larger size tubules than those with smear layer or grit blasted (p < 0.005). SEM-EDX analysis revealed mineral precipitation of calcium phosphate on the SBF immersed dentin specimens. XRD analysis showed typical crystal structure of hydroxyl apatite for the biomineralized surface layer on dentine. Conclusions Grit blasted FCC particles initially occluded effectively the opened dentinal tubules and biomineralization occurred in tubules primarily occluded by the FCC particles. However, in the optimal in vitro conditions in SBF, no difference between biomineralization was found between the grit blasted surface and the control surface. Clinical significance Several materials and methods have been established for treatment of dentinal hypersensitivity although a golden standard treatment has not been discovered. Grit blasted functionalized calcium carbonate has a potential to occlude and remineralize exposed dentinal tubules. This could offer a more biological approach on treatment of dentin hypersensitivity.
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Affiliation(s)
- S Välimaa
- Department of Biomaterials Science and Turku Clinical Biomaterials Centre - TCBC, Institute of Dentistry, University of Turku, Finland
| | - L Perea-Lowery
- Department of Biomaterials Science and Turku Clinical Biomaterials Centre - TCBC, Institute of Dentistry, University of Turku, Finland
| | - J-H Smått
- Laboratory of Physical Chemistry, Faculty of Science and Engineering and Center for Functional Materials, Åbo Akademi University, Finland
| | - J Peltonen
- Laboratory of Physical Chemistry, Faculty of Science and Engineering and Center for Functional Materials, Åbo Akademi University, Finland
| | - T Budde
- Omya International AG, Oftringen, Switzerland
| | - P K Vallittu
- Department of Biomaterials Science and Turku Clinical Biomaterials Centre - TCBC, Institute of Dentistry, University of Turku, Finland.,City of Turku, Welfare Division, Finland
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44
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Hundehege P, Cerina M, Eichler S, Thomas C, Herrmann AM, Göbel K, Müntefering T, Fernandez-Orth J, Bock S, Narayanan V, Budde T, Speckmann EJ, Wiendl H, Schubart A, Ruck T, Meuth SG. The next-generation sphingosine-1 receptor modulator BAF312 (siponimod) improves cortical network functionality in focal autoimmune encephalomyelitis. Neural Regen Res 2019; 14:1950-1960. [PMID: 31290453 PMCID: PMC6676873 DOI: 10.4103/1673-5374.259622] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Autoimmune diseases of the central nervous system (CNS) like multiple sclerosis (MS) are characterized by inflammation and demyelinated lesions in white and grey matter regions. While inflammation is present at all stages of MS, it is more pronounced in the relapsing forms of the disease, whereas progressive MS (PMS) shows significant neuroaxonal damage and grey and white matter atrophy. Hence, disease-modifying treatments beneficial in patients with relapsing MS have limited success in PMS. BAF312 (siponimod) is a novel sphingosine-1-phosphate receptor modulator shown to delay progression in PMS. Besides reducing inflammation by sequestering lymphocytes in lymphoid tissues, BAF312 crosses the blood-brain barrier and binds its receptors on neurons, astrocytes and oligodendrocytes. To evaluate potential direct neuroprotective effects, BAF312 was systemically or locally administered in the CNS of experimental autoimmune encephalomyelitis mice with distinct grey- and white-matter lesions (focal experimental autoimmune encephalomyelitis using an osmotic mini-pump). Ex-vivo flow cytometry revealed that systemic but not local BAF312 administration lowered immune cell infiltration in animals with both grey and white matter lesions. Ex-vivo voltage-sensitive dye imaging of acute brain slices revealed an altered spatio-temporal pattern of activation in the lesioned cortex compared to controls in response to electrical stimulation of incoming white-matter fiber tracts. Here, BAF312 administration showed partial restore of cortical neuronal circuit function. The data suggest that BAF312 exerts a neuroprotective effect after crossing the blood-brain barrier independently of peripheral effects on immune cells. Experiments were carried out in accordance with German and EU animal protection law and approved by local authorities (Landesamt für Natur, Umwelt und Verbraucherschutz Nordrhein-Westfalen; 87-51.04.2010.A331) on December 28, 2010.
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Affiliation(s)
- Petra Hundehege
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Manuela Cerina
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Susann Eichler
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Christian Thomas
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Alexander M Herrmann
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Kerstin Göbel
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Thomas Müntefering
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Juncal Fernandez-Orth
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Stefanie Bock
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Venu Narayanan
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Thomas Budde
- Institute of Physiology I, Westfälische Wilhelms-Universität, Münster, Germany
| | | | - Heinz Wiendl
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Anna Schubart
- Novartis Institutes of Biomedical Research, Basel, Switzerland
| | - Tobias Ruck
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
| | - Sven G Meuth
- Department of Neurology with Institute of Translational Neurology, Westfälische Wilhelms-Universität, Münster, Germany
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45
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Davoodi M, Karimooy FN, Budde T, Ortega-Martinez S, Moradi-Kor N. Beneficial effects of Japanese sake yeast supplement on biochemical, antioxidant, and anti-inflammatory factors in streptozotocin-induced diabetic rats. Diabetes Metab Syndr Obes 2019; 12:1667-1673. [PMID: 31564934 PMCID: PMC6730545 DOI: 10.2147/dmso.s220181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Accepted: 08/09/2019] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Using chemical agents in the treatment of diabetes mellitus type 2 may have some limitations due to frequent side effects. Some novel and natural agents may be promising alternatives in this case. This study was designed to evaluate the effects of oral Japanese sake yeast supplement, as a novel agent, on biochemical antioxidant and anti-inflammatory parameters in experimentally induced diabetic rats. MATERIALS AND METHODS After inducing diabetes (55 mg/kg intraperitoneal injection of streptozotocin), 120 male adult Wistar rats were randomly divided into 5 groups and each group received 0 (control), 15, 30, or 45 mg/kg of sake yeast or was considered a nondiabetic control. Then, the serum levels of tumor necrosis factor-α, IL-6, C-reactive protein, malondialdehyde, glutathione, total antioxidant status, glucose, cholesterol, triglycerides, and insulin were evaluated and compared to baseline measures. RESULTS The results showed that oral administration of sake yeast at different concentrations reduced levels of malondialdehyde, glucose, cholesterol, and triglycerides and increased levels of insulin, glutathione, and total antioxidants (P<0.05). The best responses were observed in the nondiabetic control group. CONCLUSION Sake yeast supplement may be useful as a novel agent in the treatment of diabetes.
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Affiliation(s)
- Marzieh Davoodi
- Social Determinants of Health Research Center, Yasuj University of Medical Sciences, Yasuj, Iran
| | - Faezeh Nemati Karimooy
- Department of Neuroscience, Medical School, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Thomas Budde
- Institute of Physiology I, Westfälische Wilhelms-University, Münster, Germany
| | | | - Nasroallah Moradi-Kor
- Research Center of Physiology, Semnan University of Medical Sciences, Semnan, Iran
- Correspondence: Nasroallah Moradi-KorResearch Center of Physiology, Semnan University of Medical Sciences, Damghan Road, PO Box 35195-163, Semnan, IranTel +98 233 365 4207Email
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46
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Aulova KS, Toporkova LB, Lopatnikova JA, Alshevskaya AA, Sedykh SE, Buneva VN, Budde T, Meuth SG, Popova NA, Orlovskaya IA, Nevinsky GA. Changes in cell differentiation and proliferation lead to production of abzymes in EAE mice treated with DNA-Histone complexes. J Cell Mol Med 2018; 22:5816-5832. [PMID: 30265424 PMCID: PMC6237594 DOI: 10.1111/jcmm.13850] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 06/28/2018] [Accepted: 07/20/2018] [Indexed: 01/02/2023] Open
Abstract
Experimental autoimmune encephalomyelitis (EAE)-prone C57BL/6 mice are used as a model of human multiple sclerosis. We immunize mice with myelin oligodendrocyte glycoprotein (MOG), DNA-histone and DNA-methylated bovine serum albumin (met-BSA) complexes to reveal different characteristics of EAE development including bone marrow lymphocyte proliferation and differentiation profiles of hematopoietic stem cells. Immunization of C57BL/6 mice with MOG35-55 results in the acceleration of EAE development. Anti-DNA antibodies are usually directed against DNA-histone complexes resulting from cell apoptosis. During the acute EAE phase (7-20 days after immunization), catalytic antibodies efficiently hydrolysing myelin basic protein (MBP), MOG and DNA are produced with parallel suppression of antibodies hydrolysing histones. We could show that in contrast to MOG, immunization with histone-DNA results in a reduction of proteinuria, a significant increase in anti-DNA, anti-MBP and anti-MOG antibody titres, as well as an increase in their catalytic activities for antigen hydrolysis, but slightly changes the concentration of cytokines. Contrary to MOG, DNA-histone and DNA-met-BSA only stimulated the formation of anti-DNA antibodies hydrolysing DNA with a long delay (15-20 days after immunization). Our data indicate that for C57BL/6 mice immunization with DNA-met-BSA and DNA-histone complexes may have opposing effects compared to MOG. DNA-histone stimulates the appearance of histone-hydrolysing abzymes in the acute EAE phase, while abzymes with DNase activity appear at significantly later time-points. We conclude that MOG, DNA-histone and DNA-met-BSA have different effects on numerous bone marrow, cellular, immunological and biochemical parameters of immunized mice, but all antigens finally significantly stimulate the development of the EAE.
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Affiliation(s)
- Kseniya S. Aulova
- Institute of Chemical Biology and Fundamental MedicineSiberian Branch of the Russian Academy of SciencesNovosibirskRussia
| | - Ludmila B. Toporkova
- Institute of Fundamental and Clinical ImmunologySiberian Branch of the Russian Academy of SciencesNovosibirskRussia
| | - Julia A. Lopatnikova
- Institute of Fundamental and Clinical ImmunologySiberian Branch of the Russian Academy of SciencesNovosibirskRussia
| | - Alina A. Alshevskaya
- Institute of Fundamental and Clinical ImmunologySiberian Branch of the Russian Academy of SciencesNovosibirskRussia
| | - Sergey E. Sedykh
- Institute of Chemical Biology and Fundamental MedicineSiberian Branch of the Russian Academy of SciencesNovosibirskRussia
| | - Valentina N. Buneva
- Institute of Chemical Biology and Fundamental MedicineSiberian Branch of the Russian Academy of SciencesNovosibirskRussia
| | - Thomas Budde
- Institut für Physiologie IWestfälische Wilhelms‐UniversitätMünsterGermany
| | - Sven G. Meuth
- Department of NeurologyWestfälische Wilhelms‐UniversitätMünsterGermany
| | - Nelly A. Popova
- Institute Cytology and GeneticsSiberian Branch of the Russian Academy of SciencesNovosibirskRussia
- Novosibirsk State UniversityNovosibirskRussia
| | - Irina A. Orlovskaya
- Institute of Fundamental and Clinical ImmunologySiberian Branch of the Russian Academy of SciencesNovosibirskRussia
| | - Georgy A. Nevinsky
- Institute of Chemical Biology and Fundamental MedicineSiberian Branch of the Russian Academy of SciencesNovosibirskRussia
- Novosibirsk State UniversityNovosibirskRussia
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Hundehege P, Fernandez-Orth J, Römer P, Ruck T, Müntefering T, Eichler S, Cerina M, Epping L, Albrecht S, Menke AF, Birkner K, Göbel K, Budde T, Zipp F, Wiendl H, Gorji A, Bittner S, Meuth SG. Targeting Voltage-Dependent Calcium Channels with Pregabalin Exerts a Direct Neuroprotective Effect in an Animal Model of Multiple Sclerosis. Neurosignals 2018; 26:77-93. [PMID: 30481775 DOI: 10.1159/000495425] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 11/08/2018] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS Multiple sclerosis (MS) is a prototypical autoimmune central nervous system (CNS) disease. Particularly progressive forms of MS (PMS) show significant neuroaxonal damage as consequence of demyelination and neuronal hyperexcitation. Immuno-modulatory treatment strategies are beneficial in relapsing MS (RMS), but mostly fail in PMS. Pregabalin (Lyrica®) is prescribed to MS patients to treat neuropathic pain. Mechanistically, it targets voltage-dependent Ca2+ channels and reduces harmful neuronal hyperexcitation in mouse epilepsy models. Studies suggest that GABA analogues like pregabalin exert neuroprotective effects in animal models of ischemia and trauma. METHODS We tested the impact of pregabalin in a mouse model of MS (experimental autoimmune encephalomyelitis, EAE) and performed histological and immunological evaluations as well as intravital two-photon-microscopy of brainstem EAE lesions. RESULTS Both prophylactic and therapeutic treatments ameliorated the clinical symptoms of EAE and reduced immune cell infiltration into the CNS. On neuronal level, pregabalin reduced long-term potentiation in hippocampal brain slices indicating an impact on mechanisms of learning and memory. In contrast, T cells, microglia and brain endothelial cells were unaffected by pregabalin. However, we found a direct impact of pregabalin on neurons during CNS inflammation as it reversed the pathological elevation of neuronal intracellular Ca2+ levels in EAE lesions. CONCLUSION The presented data suggest that pregabalin primarily acts on neuronal Ca2+ channel trafficking thereby reducing Ca2+-mediated cytotoxicity and neuronal damage in an animal model of MS. Future clinical trials need to assess the benefit for neuronal survival by expanding the indication for pregabalin administration to MS patients in further disease phases.
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Affiliation(s)
- Petra Hundehege
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany,
| | - Juncal Fernandez-Orth
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Pia Römer
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Tobias Ruck
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Thomas Müntefering
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Susann Eichler
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Manuela Cerina
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Lisa Epping
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Sarah Albrecht
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Amélie F Menke
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Katharina Birkner
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Kerstin Göbel
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Thomas Budde
- Institute of Physiology I, University of Münster, Münster, Germany
| | - Frauke Zipp
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Heinz Wiendl
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
| | - Ali Gorji
- Neurology Department with Institute of Translational Neurology and Neurosurgery Department, University of Münster, Münster, Germany
| | - Stefan Bittner
- Department of Neurology, Focus Program Translational Neuroscience (FTN) and Immunotherapy (FZI), Rhine Main Neuroscience Network (rmn2), University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
| | - Sven G Meuth
- Neurology Department with Institute of Translational Neurology, University of Münster, Münster, Germany
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48
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Datunashvili M, Chaudhary R, Zobeiri M, Lüttjohann A, Mergia E, Baumann A, Balfanz S, Budde B, van Luijtelaar G, Pape HC, Koesling D, Budde T. Modulation of Hyperpolarization-Activated Inward Current and Thalamic Activity Modes by Different Cyclic Nucleotides. Front Cell Neurosci 2018; 12:369. [PMID: 30405353 PMCID: PMC6207575 DOI: 10.3389/fncel.2018.00369] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 09/28/2018] [Indexed: 12/11/2022] Open
Abstract
The hyperpolarization-activated inward current, Ih, plays a key role in the generation of rhythmic activities in thalamocortical (TC) relay neurons. Cyclic nucleotides, like 3′,5′-cyclic adenosine monophosphate (cAMP), facilitate voltage-dependent activation of hyperpolarization-activated cyclic nucleotide-gated (HCN) channels by shifting the activation curve of Ih to more positive values and thereby terminating the rhythmic burst activity. The role of 3′,5′-cyclic guanosine monophosphate (cGMP) in modulation of Ih is not well understood. To determine the possible role of the nitric oxide (NO)-sensitive cGMP-forming guanylyl cyclase 2 (NO-GC2) in controlling the thalamic Ih, the voltage-dependency and cGMP/cAMP-sensitivity of Ih was analyzed in TC neurons of the dorsal part of the lateral geniculate nucleus (dLGN) in wild type (WT) and NO-GC2-deficit (NO-GC2−/−) mice. Whole cell voltage clamp recordings in brain slices revealed a more hyperpolarized half maximal activation (V1/2) of Ih in NO-GC2−/− TC neurons compared to WT. Different concentrations of 8-Br-cAMP/8-Br-cGMP induced dose-dependent positive shifts of V1/2 in both strains. Treatment of WT slices with lyase enzyme (adenylyl and guanylyl cyclases) inhibitors (SQ22536 and ODQ) resulted in further hyperpolarized V1/2. Under current clamp conditions NO-GC2−/− neurons exhibited a reduction in the Ih-dependent voltage sag and reduced action potential firing with hyperpolarizing and depolarizing current steps, respectively. Intrathalamic rhythmic bursting activity in brain slices and in a simplified mathematical model of the thalamic network was reduced in the absence of NO-GC2. In freely behaving NO-GC2−/− mice, delta and theta band activity was enhanced during active wakefulness (AW) as well as rapid eye movement (REM) sleep in cortical local field potential (LFP) in comparison to WT. These findings indicate that cGMP facilitates Ih activation and contributes to a tonic activity in TC neurons. On the network level basal cGMP production supports fast rhythmic activity in the cortex.
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Affiliation(s)
- Maia Datunashvili
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Rahul Chaudhary
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Mehrnoush Zobeiri
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Annika Lüttjohann
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Evanthia Mergia
- Institut für Pharmakologie und Toxikologie, Ruhr-Universität Bochum, Bochum, Germany
| | - Arnd Baumann
- Institute of Complex Systems, Forschungszentrum Jülich, Jülich, Germany
| | - Sabine Balfanz
- Institute of Complex Systems, Forschungszentrum Jülich, Jülich, Germany
| | - Björn Budde
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | | | - Hans-Christian Pape
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
| | - Doris Koesling
- Institut für Pharmakologie und Toxikologie, Ruhr-Universität Bochum, Bochum, Germany
| | - Thomas Budde
- Institut für Physiologie I, Westfälische Wilhelms-Universität, Münster, Germany
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49
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Wudy K, Budde T. Reaction kinetics and curing behavior of epoxies for use in a combined selective laser beam melting process of polymers. J Appl Polym Sci 2018. [DOI: 10.1002/app.46850] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- K. Wudy
- Institute of Polymer Technology, Collaborative Research Center 814 – Additive ManufacturingFriedrich‐Alexander‐Universität Erlangen‐Nürnberg Am Weichselgarten 9, D‐91058 Erlangen Germany
| | - T. Budde
- Institute of Polymer Technology, Collaborative Research Center 814 – Additive ManufacturingFriedrich‐Alexander‐Universität Erlangen‐Nürnberg Am Weichselgarten 9, D‐91058 Erlangen Germany
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50
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Eichinger P, Herrmann AM, Ruck T, Herty M, Gola L, Kovac S, Budde T, Meuth SG, Hundehege P. Human T cells in silico: Modelling dynamic intracellular calcium and its influence on cellular electrophysiology. J Immunol Methods 2018; 461:78-84. [PMID: 30158076 DOI: 10.1016/j.jim.2018.06.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 06/28/2018] [Accepted: 06/28/2018] [Indexed: 01/01/2023]
Abstract
A network of ion currents influences basic cellular T cell functions. After T cell receptor activation, changes in highly regulated calcium levels play a central role in triggering effector functions and cell differentiation. A dysregulation of these processes might be involved in the pathogenesis of several diseases. We present a mathematical model based on the NEURON simulation environment that computes dynamic calcium levels in combination with the current output of diverse ion channels (KV1.3, KCa3.1, K2P channels (TASK1-3, TRESK), VRAC, TRPM7, CRAC). In line with experimental data, the simulation shows a strong increase in intracellular calcium after T cell receptor stimulation before reaching a new, elevated calcium plateau in the T cell's activated state. Deactivation of single ion channel modules, mimicking the application of channel blockers, reveals that two types of potassium channels are the main regulators of intracellular calcium level: calcium-dependent potassium (KCa3.1) and two-pore-domain potassium (K2P) channels.
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Affiliation(s)
- Paul Eichinger
- Department of Neuroradiology, Klinikum rechts der Isar, Technische Universität München TUM, Ismaninger Straße 22, 81675 Munich, Germany
| | - Alexander M Herrmann
- Department of Neurology with Institute of Translational Neurology, Albert-Schweitzer-Campus 1, Building A1, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany
| | - Tobias Ruck
- Department of Neurology with Institute of Translational Neurology, Albert-Schweitzer-Campus 1, Building A1, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany
| | - Michael Herty
- RWTH Aachen University, Mathematics (Continuous optimization), Templergraben 55, 52056 Aachen, Germany
| | - Lukas Gola
- Department of Neuroradiology, Klinikum rechts der Isar, Technische Universität München TUM, Ismaninger Straße 22, 81675 Munich, Germany
| | - Stjepana Kovac
- Department of Neuroradiology, Klinikum rechts der Isar, Technische Universität München TUM, Ismaninger Straße 22, 81675 Munich, Germany
| | - Thomas Budde
- Institute of Physiology I, Westfälische Wilhelms-Universität Münster, Robert-Koch-Str. 27a, 48149 Münster, Germany
| | - Sven G Meuth
- Department of Neurology with Institute of Translational Neurology, Albert-Schweitzer-Campus 1, Building A1, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany
| | - Petra Hundehege
- Department of Neurology with Institute of Translational Neurology, Albert-Schweitzer-Campus 1, Building A1, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany.
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