1
|
Kilisch M, Gere-Becker M, Wüstefeld L, Bonnas C, Crauel A, Mechmershausen M, Martens H, Götzke H, Opazo F, Frey S. Simple and Highly Efficient Detection of PSD95 Using a Nanobody and Its Recombinant Heavy-Chain Antibody Derivatives. Int J Mol Sci 2023; 24:ijms24087294. [PMID: 37108454 PMCID: PMC10138605 DOI: 10.3390/ijms24087294] [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: 03/16/2023] [Revised: 04/03/2023] [Accepted: 04/06/2023] [Indexed: 04/29/2023] Open
Abstract
The post-synaptic density protein 95 (PSD95) is a crucial scaffolding protein participating in the organization and regulation of synapses. PSD95 interacts with numerous molecules, including neurotransmitter receptors and ion channels. The functional dysregulation of PSD95 as well as its abundance and localization has been implicated with several neurological disorders, making it an attractive target for developing strategies able to monitor PSD95 accurately for diagnostics and therapeutics. This study characterizes a novel camelid single-domain antibody (nanobody) that binds strongly and with high specificity to rat, mouse, and human PSD95. This nanobody allows for more precise detection and quantification of PSD95 in various biological samples. We expect that the flexibility and unique performance of this thoroughly characterized affinity tool will help to further understand the role of PSD95 in normal and diseased neuronal synapses.
Collapse
Affiliation(s)
- Markus Kilisch
- NanoTag Biotechnologies GmbH, Rudolf-Wissell-Straβe 28a, 37079 Göttingen, Germany
| | - Maja Gere-Becker
- NanoTag Biotechnologies GmbH, Rudolf-Wissell-Straβe 28a, 37079 Göttingen, Germany
| | - Liane Wüstefeld
- Synaptic Systems GmbH, Rudolf-Wissell-Straβe 28a, 37079 Göttingen, Germany
| | - Christel Bonnas
- Synaptic Systems GmbH, Rudolf-Wissell-Straβe 28a, 37079 Göttingen, Germany
| | - Alexander Crauel
- NanoTag Biotechnologies GmbH, Rudolf-Wissell-Straβe 28a, 37079 Göttingen, Germany
| | - Maja Mechmershausen
- NanoTag Biotechnologies GmbH, Rudolf-Wissell-Straβe 28a, 37079 Göttingen, Germany
| | - Henrik Martens
- Synaptic Systems GmbH, Rudolf-Wissell-Straβe 28a, 37079 Göttingen, Germany
| | - Hansjörg Götzke
- NanoTag Biotechnologies GmbH, Rudolf-Wissell-Straβe 28a, 37079 Göttingen, Germany
| | - Felipe Opazo
- NanoTag Biotechnologies GmbH, Rudolf-Wissell-Straβe 28a, 37079 Göttingen, Germany
- Institute of Neuro- and Sensory Physiology, University Medical Center Göttingen, 37073 Göttingen, Germany
- Center for Biostructural Imaging of Neurodegeneration (BIN), University of Göttingen Medical Center, 37075 Göttingen, Germany
| | - Steffen Frey
- NanoTag Biotechnologies GmbH, Rudolf-Wissell-Straβe 28a, 37079 Göttingen, Germany
| |
Collapse
|
2
|
Schob S, Puchta J, Winter K, Michalski D, Mages B, Martens H, Emmer A, Hoffmann KT, Gaunitz F, Meinicke A, Krause M, Härtig W. Surfactant protein C is associated with perineuronal nets and shows age-dependent changes of brain content and hippocampal deposits in wildtype and 3xTg mice. J Chem Neuroanat 2021; 118:102036. [PMID: 34626771 DOI: 10.1016/j.jchemneu.2021.102036] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2021] [Revised: 09/24/2021] [Accepted: 09/24/2021] [Indexed: 01/15/2023]
Abstract
Surfactant protein C (SP-C) modulates cerebrospinal fluid (CSF) rheology. During ageing, its declining levels are accompanied by an increased burden of white matter lesions. Pulmonary SP-C intermediates harbouring the BRICHOS-domain prevent protein misfolding in the lungs. Thus, cerebral SP-C intermediates may counteract cerebral β-amyloidosis, a hallmark of Alzheimer's disease (AD). However, data on the molecular neuroanatomy of SP-C and its alterations in wildtype and triple transgenic (3xTg) mice, featuring essential elements of AD-neuropathology, are lacking. Therefore, this study investigated SP-C-containing structures in murine forebrains and their spatial relationships with vascular, glial and neuronal components of the neurovascular unit. Fluorescence labelling demonstrated neuronal SP-C in the medial habenula, the indusium griseum and the hippocampus. Glial counterstaining elucidated astrocytes in the corpus callosum co-expressing SP-C and S100β. Notably, perineuronal nets were associated with SP-C in the nucleus reticularis thalami, the lateral hypothalamus and the retrosplenial cortex. In the hippocampus of aged 3xTg mice, an increased number of dot-like depositions containing SP-C and Reelin, but devoid of BRICHOS-immunoreactivity were observed apart from AD-like lesions. Wildtype and 3xTg mice revealed an age-dependent increase of such deposits markedly pronounced in about 24-month-old 3xTg mice. SP-C levels of the intracellular and extracellular compartments in each group revealed an inverse correlation of SP-C and Reelin, with reduced SP-C and increased Reelin in an age-dependent fashion especially in 3xTg mice. Taken together, extracellular SP-C, as modulator of glymphatic clearance and potential ligand of PNs, declines in 3xTg mice, which show an accumulation of extracellular Reelin depositions during ageing.
Collapse
Affiliation(s)
- Stefan Schob
- Department of Neuroradiology, Clinic and Policlinic of Radiology, University Hospital Halle, Ernst-Grube-Str. 40, 06120 Halle/Saale, Germany.
| | - Joana Puchta
- Paul Flechsig Institute for Brain Research, University of Leipzig, Liebigstr.19, 04103 Leipzig, Germany; Institute of Neuroradiology, University of Leipzig, Liebigstr. 20, 04103 Leipzig, Germany
| | - Karsten Winter
- Institute for Anatomy, University of Leipzig, Liebigstr. 13, 04103 Leipzig, Germany
| | - Dominik Michalski
- Department of Neurology, University of Leipzig, Liebigstr. 13, 04103 Leipzig, Germany
| | - Bianca Mages
- Institute for Anatomy, University of Leipzig, Liebigstr. 13, 04103 Leipzig, Germany
| | - Henrik Martens
- Synaptic Systems GmbH, Rudolf-Wissell-Str. 28a, 37079 Göttingen, Germany
| | - Alexander Emmer
- Department of Neurology, Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06120 Halle/Saale, Germany
| | - Karl-Titus Hoffmann
- Institute of Neuroradiology, University of Leipzig, Liebigstr. 20, 04103 Leipzig, Germany
| | - Frank Gaunitz
- Department of Neurosurgery, University of Leipzig, Liebigstr. 20, 04103 Leipzig, Germany
| | - Anton Meinicke
- Paul Flechsig Institute for Brain Research, University of Leipzig, Liebigstr.19, 04103 Leipzig, Germany; Institute of Neuroradiology, University of Leipzig, Liebigstr. 20, 04103 Leipzig, Germany
| | - Matthias Krause
- Department of Neurosurgery, University of Leipzig, Liebigstr. 20, 04103 Leipzig, Germany
| | - Wolfgang Härtig
- Paul Flechsig Institute for Brain Research, University of Leipzig, Liebigstr.19, 04103 Leipzig, Germany
| |
Collapse
|
3
|
Michalski D, Spielvogel E, Puchta J, Reimann W, Barthel H, Nitzsche B, Mages B, Jäger C, Martens H, Horn AKE, Schob S, Härtig W. Increased Immunosignals of Collagen IV and Fibronectin Indicate Ischemic Consequences for the Neurovascular Matrix Adhesion Zone in Various Animal Models and Human Stroke Tissue. Front Physiol 2020; 11:575598. [PMID: 33192578 PMCID: PMC7649770 DOI: 10.3389/fphys.2020.575598] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [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: 06/23/2020] [Accepted: 09/23/2020] [Indexed: 12/21/2022] Open
Abstract
Ischemic stroke causes cellular alterations in the “neurovascular unit” (NVU) comprising neurons, glia, and the vasculature, and affects the blood-brain barrier (BBB) with adjacent extracellular matrix (ECM). Limited data are available for the zone between the NVU and ECM that has not yet considered for neuroprotective approaches. This study describes ischemia-induced alterations for two main components of the neurovascular matrix adhesion zone (NMZ), i.e., collagen IV as basement membrane constituent and fibronectin as crucial part of the ECM, in conjunction with traditional NVU elements. For spatio-temporal characterization of these structures, multiple immunofluorescence labeling was applied to tissues affected by focal cerebral ischemia using a filament-based model in mice (4, 24, and 72 h of ischemia), a thromboembolic model in rats (24 h of ischemia), a coagulation-based model in sheep (2 weeks of ischemia), and human autoptic stroke tissue (3 weeks of ischemia). An increased fibronectin immunofluorescence signal demarcated ischemia-affected areas in mice, along with an increased collagen IV signal and BBB impairment indicated by serum albumin extravasation. Quantifications revealed a region-specific pattern with highest collagen IV and fibronectin intensities in most severely affected neocortical areas, followed by a gradual decline toward the border zone and non-affected regions. Comparing 4 and 24 h of ischemia, the subcortical fibronectin signal increased significantly over time, whereas neocortical areas displayed only a gradual increase. Qualitative analyses confirmed increased fibronectin and collagen IV signals in ischemic areas from all tissues and time points investigated. While the increased collagen IV signal was restricted to vessels, fibronectin appeared diffusely arranged in the parenchyma with focal accumulations associated to the vasculature. Integrin α5 appeared enriched in the vicinity of fibronectin and vascular elements, while most of the non-vascular NVU elements showed complementary staining patterns referring to fibronectin. This spatio-temporal characterization of ischemia-related alterations of collagen IV and fibronectin in various stroke models and human autoptic tissue shows that ischemic consequences are not limited to traditional NVU components and the ECM, but also involve the NMZ. Future research should explore more components and the pathophysiological properties of the NMZ as a possible target for novel neuroprotective approaches.
Collapse
Affiliation(s)
| | - Emma Spielvogel
- Department of Neurology, University of Leipzig, Leipzig, Germany.,Paul Flechsig Institute for Brain Research, University of Leipzig, Leipzig, Germany
| | - Joana Puchta
- Paul Flechsig Institute for Brain Research, University of Leipzig, Leipzig, Germany.,Department of Neuroradiology, University of Leipzig, Leipzig, Germany
| | - Willi Reimann
- Department of Neurology, University of Leipzig, Leipzig, Germany.,Paul Flechsig Institute for Brain Research, University of Leipzig, Leipzig, Germany
| | - Henryk Barthel
- Department of Nuclear Medicine, University of Leipzig, Leipzig, Germany
| | - Björn Nitzsche
- Department of Nuclear Medicine, University of Leipzig, Leipzig, Germany.,Institute of Anatomy, Histology and Embryology, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
| | - Bianca Mages
- Institute of Anatomy, University of Leipzig, Leipzig, Germany
| | - Carsten Jäger
- Paul Flechsig Institute for Brain Research, University of Leipzig, Leipzig, Germany
| | | | - Anja K E Horn
- Institute of Anatomy and Cell Biology I and German Center for Vertigo and Balance Disorders, Ludwig-Maximilians-University, Munich, Germany
| | - Stefan Schob
- Department of Neuroradiology, University of Leipzig, Leipzig, Germany
| | - Wolfgang Härtig
- Paul Flechsig Institute for Brain Research, University of Leipzig, Leipzig, Germany
| |
Collapse
|
4
|
Wakhloo D, Scharkowski F, Curto Y, Javed Butt U, Bansal V, Steixner-Kumar AA, Wüstefeld L, Rajput A, Arinrad S, Zillmann MR, Seelbach A, Hassouna I, Schneider K, Qadir Ibrahim A, Werner HB, Martens H, Miskowiak K, Wojcik SM, Bonn S, Nacher J, Nave KA, Ehrenreich H. Functional hypoxia drives neuroplasticity and neurogenesis via brain erythropoietin. Nat Commun 2020; 11:1313. [PMID: 32152318 PMCID: PMC7062779 DOI: 10.1038/s41467-020-15041-1] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [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: 10/15/2019] [Accepted: 02/12/2020] [Indexed: 12/18/2022] Open
Abstract
Erythropoietin (EPO), named after its role in hematopoiesis, is also expressed in mammalian brain. In clinical settings, recombinant EPO treatment has revealed a remarkable improvement of cognition, but underlying mechanisms have remained obscure. Here, we show with a novel line of reporter mice that cognitive challenge induces local/endogenous hypoxia in hippocampal pyramidal neurons, hence enhancing expression of EPO and EPO receptor (EPOR). High-dose EPO administration, amplifying auto/paracrine EPO/EPOR signaling, prompts the emergence of new CA1 neurons and enhanced dendritic spine densities. Single-cell sequencing reveals rapid increase in newly differentiating neurons. Importantly, improved performance on complex running wheels after EPO is imitated by exposure to mild exogenous/inspiratory hypoxia. All these effects depend on neuronal expression of the Epor gene. This suggests a model of neuroplasticity in form of a fundamental regulatory circle, in which neuronal networks—challenged by cognitive tasks—drift into transient hypoxia, thereby triggering neuronal EPO/EPOR expression. EPO treatment improves cognition, but underlying mechanisms were unknown. Here the authors describe a regulatory loop in which brain networks challenged by cognitive tasks drift into functional hypoxia that drives—via neuronal EPO synthesis—neurodifferentiation and dendritic spine formation.
Collapse
Affiliation(s)
- Debia Wakhloo
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Franziska Scharkowski
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Yasmina Curto
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany.,Neurobiology Unit, Program in Neurosciences and Interdisciplinary Research Structure for Biotechnology and Biomedicine (BIOTECMED), Universitat de València, Burjassot, Spain
| | - Umer Javed Butt
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Vikas Bansal
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany.,Institute of Medical Systems Biology, Center for Molecular Neurobiology, University Clinic Hamburg-Eppendorf, Hamburg, Germany
| | - Agnes A Steixner-Kumar
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Liane Wüstefeld
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Ashish Rajput
- Institute of Medical Systems Biology, Center for Molecular Neurobiology, University Clinic Hamburg-Eppendorf, Hamburg, Germany
| | - Sahab Arinrad
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Matthias R Zillmann
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Anna Seelbach
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Imam Hassouna
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Katharina Schneider
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Abdul Qadir Ibrahim
- Institute of Medical Systems Biology, Center for Molecular Neurobiology, University Clinic Hamburg-Eppendorf, Hamburg, Germany
| | - Hauke B Werner
- Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | | | - Kamilla Miskowiak
- Copenhagen Affective Disorder Research Centre, Psychiatric Centre Copenhagen, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
| | - Sonja M Wojcik
- Department of Molecular Neurobiology, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Stefan Bonn
- Institute of Medical Systems Biology, Center for Molecular Neurobiology, University Clinic Hamburg-Eppendorf, Hamburg, Germany.,DFG Research Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany
| | - Juan Nacher
- Neurobiology Unit, Program in Neurosciences and Interdisciplinary Research Structure for Biotechnology and Biomedicine (BIOTECMED), Universitat de València, Burjassot, Spain.,CIBERSAM: Spanish National Network for Research in Mental Health, Valencia, Spain.,Fundación Investigación Hospital Clínico de Valencia, INCLIVA, Valencia, Spain
| | - Klaus-Armin Nave
- Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany. .,DFG Research Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany.
| | - Hannelore Ehrenreich
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany. .,DFG Research Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany.
| |
Collapse
|
5
|
Potier F, Degryse JM, Aubouy G, Henrard S, Bihin B, Debacq-Chainiaux F, Martens H, de Saint-Hubert M. Spousal Caregiving Is Associated with an Increased Risk of Frailty: A Case-Control Study. J Frailty Aging 2019; 7:170-175. [PMID: 30095147 DOI: 10.14283/jfa.2018.11] [Citation(s) in RCA: 6] [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] [Indexed: 11/11/2022]
Abstract
BACKGROUND Evidence suggests that providing care for a disabled elderly person may have implications for the caregiver's own health (decreased immunity, hypertension, and depression). OBJECTIVE Explore if older spousal caregivers are at greater risks of frailty compared to older people without a load of care. DESIGN Case-control study. SETTING Participants were assessed at home in Wallonia, Belgium. PARTICIPANTS Cases: community-dwelling spousal caregivers of older patients, recruited mainly by the geriatric outpatient clinic. CONTROLS people living at home with an independent spouse at the functional and cognitive level matched for age, gender and comorbidities. MEASUREMENTS Mini nutritional assessment-short form (MNA-SF), short physical performance battery (SPPB), frailty phenotype (Fried), geriatric depression scale (GDS-15), clock drawing test, sleep quality, and medications. The multivariable analysis used a conditional logistic regression. RESULTS Among 79 caregivers, 42 were women; mean age and Charlson comorbidity index were 79.4±5.3 and 4.0±1.2, respectively. Among care-receivers (mean age 81.4±5.2), 82% had cognitive impairment. Caregiving was associated with a risk of frailty (Odd Ratio (OR) 6.66; 95% confidence interval (CI) 2.20-20.16), the consumption of antidepressants (OR 4.74; 95% CI 1.32 -17.01), shorter nights of sleep (OR 3.53; 95% CI 1.37-9.13) and more difficulties maintaining a social network (OR 5.25; 95% CI 1.68-16.40). CONCLUSIONS Spousal caregivers were at an increased risk of being frail, having shorter nights of sleep, taking antidepressants and having difficulties maintaining their social network, compared to non-caregiver controls. Older spousal caregivers deserve the full attention of professionals to prevent functional decline and anticipate a care breakdown.
Collapse
Affiliation(s)
- F Potier
- Florence Potier M.D., Department of Geriatrics, Centre Hospitalier Universitaire Université Catholique de Louvain Namur, 1, rue Dr G. Therasse, 5530 Mont-Godinne, Belgium. Tel 0032/81422175. Fax: 0032/81423885.
| | | | | | | | | | | | | | | |
Collapse
|
6
|
Garcia-Agudo LF, Janova H, Sendler LE, Arinrad S, Steixner AA, Hassouna I, Balmuth E, Ronnenberg A, Schopf N, van der Flier FJ, Begemann M, Martens H, Weber MS, Boretius S, Nave KA, Ehrenreich H. Genetically induced brain inflammation by Cnp deletion transiently benefits from microglia depletion. FASEB J 2019; 33:8634-8647. [PMID: 31090455 DOI: 10.1096/fj.201900337r] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Reduced expression of 2'-3'-cyclic nucleotide 3'-phosphodiesterase (Cnp) in humans and mice causes white matter inflammation and catatonic signs. These consequences are experimentally alleviated by microglia ablation via colony-stimulating factor 1 receptor (CSF1R) inhibition using PLX5622. Here we address for the first time preclinical topics crucial for translation, most importantly 1) the comparison of 2 long-term PLX5622 applications (prevention and treatment) vs. 1 treatment alone, 2) the correlation of catatonic signs and executive dysfunction, 3) the phenotype of leftover microglia evading depletion, and 4) the role of intercellular interactions for efficient CSF1R inhibition. Based on our Cnp-/- mouse model and in vitro time-lapse imaging, we report the unexpected discovery that microglia surviving under PLX5622 display a highly inflammatory phenotype including aggressive premortal phagocytosis of oligodendrocyte precursor cells. Interestingly, ablating microglia in vitro requires mixed glial cultures, whereas cultured pure microglia withstand PLX5622 application. Importantly, 2 extended rounds of CSF1R inhibition are not superior to 1 treatment regarding any readout investigated (magnetic resonance imaging and magnetic resonance spectroscopy, behavior, immunohistochemistry). Catatonia-related executive dysfunction and brain atrophy of Cnp-/- mice fail to improve under PLX5622. To conclude, even though microglia depletion is temporarily beneficial and worth pursuing, complementary treatment strategies are needed for full and lasting recovery.-Fernandez Garcia-Agudo, L., Janova, H., Sendler, L. E., Arinrad, S., Steixner, A. A., Hassouna, I., Balmuth, E., Ronnenberg, A., Schopf, N., van der Flier, F. J., Begemann, M., Martens, H., Weber, M. S., Boretius, S., Nave, K.-A., Ehrenreich, H. Genetically induced brain inflammation by Cnp deletion transiently benefits from microglia depletion.
Collapse
Affiliation(s)
| | - Hana Janova
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany.,Deutsche Forschungsgemeinschaft (DFG) Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany
| | - Lea E Sendler
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Sahab Arinrad
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Agnes A Steixner
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Imam Hassouna
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Evan Balmuth
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Anja Ronnenberg
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Nadine Schopf
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | | | - Martin Begemann
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany.,Deutsche Forschungsgemeinschaft (DFG) Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany.,Department of Psychiatry and Psychotherapy, UMG, Georg-August-University, Göttingen, Germany
| | | | - Martin S Weber
- Institute of Neuropathology and Department of Neurology, Universitätsmedizin Göttingen (UMG), Georg-August-University, Göttingen, Germany
| | - Susann Boretius
- Deutsche Forschungsgemeinschaft (DFG) Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany.,Functional Imaging Laboratory, Leibniz Institute for Primate Research, Göttingen, Germany
| | - Klaus-Armin Nave
- Deutsche Forschungsgemeinschaft (DFG) Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany.,Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Hannelore Ehrenreich
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany.,Deutsche Forschungsgemeinschaft (DFG) Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany
| |
Collapse
|
7
|
Mazerolles T, Heuzey M, Soliman M, Martens H, Kleppinger R, Huneault M. Development of co-continuous morphology in blends of thermoplastic starch and low-density polyethylene. Carbohydr Polym 2019; 206:757-766. [DOI: 10.1016/j.carbpol.2018.11.038] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 11/06/2018] [Accepted: 11/11/2018] [Indexed: 10/27/2022]
|
8
|
Pan H, Oliveira B, Saher G, Dere E, Tapken D, Mitjans M, Seidel J, Wesolowski J, Wakhloo D, Klein-Schmidt C, Ronnenberg A, Schwabe K, Trippe R, Mätz-Rensing K, Berghoff S, Al-Krinawe Y, Martens H, Begemann M, Stöcker W, Kaup FJ, Mischke R, Boretius S, Nave KA, Krauss JK, Hollmann M, Lühder F, Ehrenreich H. Uncoupling the widespread occurrence of anti-NMDAR1 autoantibodies from neuropsychiatric disease in a novel autoimmune model. Mol Psychiatry 2019; 24:1489-1501. [PMID: 29426955 PMCID: PMC6756099 DOI: 10.1038/s41380-017-0011-3] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 10/20/2017] [Accepted: 10/30/2017] [Indexed: 02/07/2023]
Abstract
Autoantibodies of the IgG class against N-methyl-D-aspartate-receptor subunit-NR1 (NMDAR1-AB) were considered pathognomonic for anti-NMDAR encephalitis. This view has been challenged by the age-dependent seroprevalence (up to >20%) of functional NMDAR1-AB of all immunoglobulin classes found in >5000 individuals, healthy or affected by different diseases. These findings question a merely encephalitogenic role of NMDAR1-AB. Here, we show that NMDAR1-AB belong to the normal autoimmune repertoire of dogs, cats, rats, mice, baboons, and rhesus macaques, and are functional in the NMDAR1 internalization assay based on human IPSC-derived cortical neurons. The age dependence of seroprevalence is lost in nonhuman primates in captivity and in human migrants, raising the intriguing possibility that chronic life stress may be related to NMDAR1-AB formation, predominantly of the IgA class. Active immunization of ApoE-/- and ApoE+/+ mice against four peptides of the extracellular NMDAR1 domain or ovalbumin (control) leads to high circulating levels of specific AB. After 4 weeks, the endogenously formed NMDAR1-AB (IgG) induce psychosis-like symptoms upon MK-801 challenge in ApoE-/- mice, characterized by an open blood-brain barrier, but not in their ApoE+/+ littermates, which are indistinguishable from ovalbumin controls. Importantly, NMDAR1-AB do not induce any sign of inflammation in the brain. Immunohistochemical staining for microglial activation markers and T lymphocytes in the hippocampus yields comparable results in ApoE-/- and ApoE+/+ mice, irrespective of immunization against NMDAR1 or ovalbumin. These data suggest that NMDAR1-AB of the IgG class shape behavioral phenotypes upon access to the brain but do not cause brain inflammation on their own.
Collapse
Affiliation(s)
- Hong Pan
- 0000 0001 0668 6902grid.419522.9Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Bárbara Oliveira
- 0000 0001 0668 6902grid.419522.9Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Gesine Saher
- 0000 0001 0668 6902grid.419522.9Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Ekrem Dere
- 0000 0001 0668 6902grid.419522.9Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Daniel Tapken
- 0000 0004 0490 981Xgrid.5570.7Department of Biochemistry I—Receptor Biochemistry, Ruhr University, Bochum, Germany
| | - Marina Mitjans
- 0000 0001 0668 6902grid.419522.9Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Jan Seidel
- 0000 0001 0668 6902grid.419522.9Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Janina Wesolowski
- 0000 0001 0668 6902grid.419522.9Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Debia Wakhloo
- 0000 0001 0668 6902grid.419522.9Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Christina Klein-Schmidt
- 0000 0004 0490 981Xgrid.5570.7Department of Biochemistry I—Receptor Biochemistry, Ruhr University, Bochum, Germany
| | - Anja Ronnenberg
- 0000 0001 0668 6902grid.419522.9Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Kerstin Schwabe
- 0000 0000 9529 9877grid.10423.34Department of Neurosurgery, Hannover Medical School, Hannover, Germany
| | - Ralf Trippe
- 0000 0004 0490 981Xgrid.5570.7Department of Biochemistry I—Receptor Biochemistry, Ruhr University, Bochum, Germany
| | - Kerstin Mätz-Rensing
- Department of Pathology, Leibniz Institute for Primate Research, Göttingen, Germany
| | - Stefan Berghoff
- 0000 0001 0668 6902grid.419522.9Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Yazeed Al-Krinawe
- 0000 0000 9529 9877grid.10423.34Department of Neurosurgery, Hannover Medical School, Hannover, Germany
| | | | - Martin Begemann
- 0000 0001 0668 6902grid.419522.9Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Winfried Stöcker
- Institute for Experimental Immunology, affiliated to Euroimmun, Lübeck, Germany
| | - Franz-Josef Kaup
- Department of Pathology, Leibniz Institute for Primate Research, Göttingen, Germany
| | - Reinhard Mischke
- 0000 0001 0126 6191grid.412970.9Small Animal Clinic, University of Veterinary Medicine, Hannover, Germany
| | - Susann Boretius
- Functional Imaging Laboratory, Leibniz Institute for Primate Research, Göttingen, Germany
| | - Klaus-Armin Nave
- 0000 0001 0668 6902grid.419522.9Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany ,DFG Research Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany
| | - Joachim K. Krauss
- 0000 0000 9529 9877grid.10423.34Department of Neurosurgery, Hannover Medical School, Hannover, Germany
| | - Michael Hollmann
- 0000 0004 0490 981Xgrid.5570.7Department of Biochemistry I—Receptor Biochemistry, Ruhr University, Bochum, Germany
| | - Fred Lühder
- 0000 0001 0482 5331grid.411984.1Department of Neuroimmunology, Institute for Multiple Sclerosis Research and Hertie Foundation, University Medicine Göttingen, Göttingen, Germany
| | - Hannelore Ehrenreich
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany. .,DFG Research Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany.
| |
Collapse
|
9
|
Awasthi A, Ramachandran B, Ahmed S, Benito E, Shinoda Y, Nitzan N, Heukamp A, Rannio S, Martens H, Barth J, Burk K, Wang YT, Fischer A, Dean C. Synaptotagmin-3 drives AMPA receptor endocytosis, depression of synapse strength, and forgetting. Science 2018; 363:science.aav1483. [PMID: 30545844 DOI: 10.1126/science.aav1483] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Accepted: 11/01/2018] [Indexed: 01/01/2023]
Abstract
Forgetting is important. Without it, the relative importance of acquired memories in a changing environment is lost. We discovered that synaptotagmin-3 (Syt3) localizes to postsynaptic endocytic zones and removes AMPA receptors from synaptic plasma membranes in response to stimulation. AMPA receptor internalization, long-term depression (LTD), and decay of long-term potentiation (LTP) of synaptic strength required calcium-sensing by Syt3 and were abolished through Syt3 knockout. In spatial memory tasks, mice in which Syt3 was knocked out learned normally but exhibited a lack of forgetting. Disrupting Syt3:GluA2 binding in a wild-type background mimicked the lack of LTP decay and lack of forgetting, and these effects were occluded in the Syt3 knockout background. Our findings provide evidence for a molecular mechanism in which Syt3 internalizes AMPA receptors to depress synaptic strength and promote forgetting.
Collapse
Affiliation(s)
- Ankit Awasthi
- Trans-synaptic Signaling Group, European Neuroscience Institute, 37077 Goettingen, Germany
| | - Binu Ramachandran
- Trans-synaptic Signaling Group, European Neuroscience Institute, 37077 Goettingen, Germany
| | - Saheeb Ahmed
- Trans-synaptic Signaling Group, European Neuroscience Institute, 37077 Goettingen, Germany
| | - Eva Benito
- German Center for Neurodegenerative Disease, 37075 Goettingen, Germany.,Department of Psychiatry and Psychotherapy, University Medical Center Goettingen, 37075 Goettingen, Germany
| | - Yo Shinoda
- Trans-synaptic Signaling Group, European Neuroscience Institute, 37077 Goettingen, Germany
| | - Noam Nitzan
- Trans-synaptic Signaling Group, European Neuroscience Institute, 37077 Goettingen, Germany
| | - Alina Heukamp
- Trans-synaptic Signaling Group, European Neuroscience Institute, 37077 Goettingen, Germany
| | - Sabine Rannio
- Trans-synaptic Signaling Group, European Neuroscience Institute, 37077 Goettingen, Germany
| | | | - Jonas Barth
- German Center for Neurodegenerative Disease, 37075 Goettingen, Germany.,Department of Psychiatry and Psychotherapy, University Medical Center Goettingen, 37075 Goettingen, Germany
| | - Katja Burk
- Trans-synaptic Signaling Group, European Neuroscience Institute, 37077 Goettingen, Germany
| | - Yu Tian Wang
- Brain Research Center and Department of Medicine, University of British Columbia, Vancouver, BC V6T2B5, Canada
| | - Andre Fischer
- German Center for Neurodegenerative Disease, 37075 Goettingen, Germany.,Department of Psychiatry and Psychotherapy, University Medical Center Goettingen, 37075 Goettingen, Germany
| | - Camin Dean
- Trans-synaptic Signaling Group, European Neuroscience Institute, 37077 Goettingen, Germany.
| |
Collapse
|
10
|
Michalski D, Keck AL, Grosche J, Martens H, Härtig W. Immunosignals of Oligodendrocyte Markers and Myelin-Associated Proteins Are Critically Affected after Experimental Stroke in Wild-Type and Alzheimer Modeling Mice of Different Ages. Front Cell Neurosci 2018; 12:23. [PMID: 29467621 PMCID: PMC5807905 DOI: 10.3389/fncel.2018.00023] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [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: 09/24/2017] [Accepted: 01/15/2018] [Indexed: 12/31/2022] Open
Abstract
Because stroke therapies are still limited and patients are often concerned by long-term sequelae with significant impairment of daily living, elaborated neuroprotective strategies are needed. During the last decades, research substantially improved the knowledge on cellular pathologies responsible for stroke-related tissue damage. In this context, the neurovascular unit (NVU) concept has been established, summarizing the affections of neurons, associated astrocytes and the vasculature. Although oligodendrocytes were already identified to play a major role in other brain pathologies, their role during stroke evolution and long-lasting tissue damage is poorly understood. This study aims to explore oligodendrocyte structures, i.e., oligodendrocytes and their myelin-associated proteins, after experimental focal cerebral ischemia. For translational issues, different ages and genotypes including an Alzheimer-like background were considered to mimic potential co-morbidities. Three- and 12-month-old wild-type and triple-transgenic mice were subjected to unilateral middle cerebral artery occlusion. Immunofluorescence labeling was performed on forebrain tissues affected by 24 h of ischemia to visualize the oligodendrocyte-specific protein (OSP), the myelin basic protein (MBP), and the neuron-glia antigen 2 (NG2) with reference to the ischemic lesion. Subsequent analyses concomitantly detected the vasculature and the 2′, 3′-cyclic nucleotide-3′-phosphodiesterase (CNPase) to consider the NVU concept and to explore the functional relevance of histochemical data on applied oligodendrocyte markers. While the immunosignal of NG2 was found to be nearly absent 24 h after ischemia onset, enhanced immunoreactivities for OSP and especially MBP were observed in close regional association to the vasculature. Added quantitative analyses based on inter-hemispheric differences of MBP-immunoreactivity revealed a shell-like pattern with a significant increase directly in the ischemic core, followed by a gradual decline toward the striatum, the ischemic border zone and the lateral neocortex. This observation was consistent in subsequent analyses on the potential impact of age and genetic background. Furthermore, immunoreactivities for CNPase, MBP, and OSP were found to be simultaneously enhanced. In conclusion, this study provides evidence for a critical role of oligodendrocyte structures in the early phase after experimental stroke, strengthening their involvement in the ischemia-affected NVU. Consequently, oligodendrocytes and their myelin-associated proteins may qualify as potential targets for neuroprotective and regenerative approaches in stroke.
Collapse
Affiliation(s)
| | - Anna L Keck
- Paul Flechsig Institute for Brain Research, University of Leipzig, Leipzig, Germany
| | | | | | - Wolfgang Härtig
- Paul Flechsig Institute for Brain Research, University of Leipzig, Leipzig, Germany
| |
Collapse
|
11
|
Rodriguez Camargo DC, Tripsianes K, Buday K, Franko A, Göbl C, Hartlmüller C, Sarkar R, Aichler M, Mettenleiter G, Schulz M, Böddrich A, Erck C, Martens H, Walch AK, Madl T, Wanker EE, Conrad M, de Angelis MH, Reif B. The redox environment triggers conformational changes and aggregation of hIAPP in Type II Diabetes. Sci Rep 2017; 7:44041. [PMID: 28287098 PMCID: PMC5347123 DOI: 10.1038/srep44041] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [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: 09/23/2016] [Accepted: 02/03/2017] [Indexed: 12/22/2022] Open
Abstract
Type II diabetes (T2D) is characterized by diminished insulin production and resistance of cells to insulin. Among others, endoplasmic reticulum (ER) stress is a principal factor contributing to T2D and induces a shift towards a more reducing cellular environment. At the same time, peripheral insulin resistance triggers the over-production of regulatory hormones such as insulin and human islet amyloid polypeptide (hIAPP). We show that the differential aggregation of reduced and oxidized hIAPP assists to maintain the redox equilibrium by restoring redox equivalents. Aggregation thus induces redox balancing which can assist initially to counteract ER stress. Failure of the protein degradation machinery might finally result in β-cell disruption and cell death. We further present a structural characterization of hIAPP in solution, demonstrating that the N-terminus of the oxidized peptide has a high propensity to form an α-helical structure which is lacking in the reduced state of hIAPP. In healthy cells, this residual structure prevents the conversion into amyloidogenic aggregates.
Collapse
Affiliation(s)
- Diana C Rodriguez Camargo
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany
| | - Konstantinos Tripsianes
- Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, Brno 62500, Czech Republic
| | - Katalin Buday
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany
| | - Andras Franko
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,German Center for Diabetes Research (DZD e.V.), Neuherberg 85764, Germany
| | - Christoph Göbl
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany
| | - Christoph Hartlmüller
- Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany
| | - Riddhiman Sarkar
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany
| | - Michaela Aichler
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany
| | | | - Michael Schulz
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany
| | - Annett Böddrich
- Max-Delbrück-Center Berlin (MDC), Robert-Rössle-Str. 10, Berlin 13125, Germany
| | - Christian Erck
- Synaptic Systems GmbH, Rudolf-Wissell-Straße 28, Göttingen, 37079, Germany
| | - Henrik Martens
- Synaptic Systems GmbH, Rudolf-Wissell-Straße 28, Göttingen, 37079, Germany
| | - Axel Karl Walch
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany
| | - Tobias Madl
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany.,Institute of Molecular Biology &Biochemistry, Center of Molecular Medicine, Medical University of Graz, Austria
| | - Erich E Wanker
- Max-Delbrück-Center Berlin (MDC), Robert-Rössle-Str. 10, Berlin 13125, Germany
| | - Marcus Conrad
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany
| | - Martin Hrabě de Angelis
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,German Center for Diabetes Research (DZD e.V.), Neuherberg 85764, Germany.,Technische Universität München, Center of Life and Food Sciences Weihenstephan, Freising 85354, Germany
| | - Bernd Reif
- Helmholtz Zentrum München, Ingolstädter Landstr. 1, Neuherberg 85764, Germany.,Munich Center for Integrated Protein Science (CIPS-M) at Department Chemie, Technische Universität München (TUM), Germany
| |
Collapse
|
12
|
Romanov RA, Zeisel A, Bakker J, Girach F, Hellysaz A, Tomer R, Alpár A, Mulder J, Clotman F, Keimpema E, Hsueh B, Crow AK, Martens H, Schwindling C, Calvigioni D, Bains JS, Máté Z, Szabó G, Yanagawa Y, Zhang M, Rendeiro A, Farlik M, Uhlén M, Wulff P, Bock C, Broberger C, Deisseroth K, Hökfelt T, Linnarsson S, Horvath TL, Harkany T. Molecular interrogation of hypothalamic organization reveals distinct dopamine neuronal subtypes. Nat Neurosci 2017; 20:176-188. [PMID: 27991900 PMCID: PMC7615022 DOI: 10.1038/nn.4462] [Citation(s) in RCA: 276] [Impact Index Per Article: 39.4] [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: 06/27/2016] [Accepted: 11/18/2016] [Indexed: 12/13/2022]
Abstract
The hypothalamus contains the highest diversity of neurons in the brain. Many of these neurons can co-release neurotransmitters and neuropeptides in a use-dependent manner. Investigators have hitherto relied on candidate protein-based tools to correlate behavioral, endocrine and gender traits with hypothalamic neuron identity. Here we map neuronal identities in the hypothalamus by single-cell RNA sequencing. We distinguished 62 neuronal subtypes producing glutamatergic, dopaminergic or GABAergic markers for synaptic neurotransmission and harboring the ability to engage in task-dependent neurotransmitter switching. We identified dopamine neurons that uniquely coexpress the Onecut3 and Nmur2 genes, and placed these in the periventricular nucleus with many synaptic afferents arising from neuromedin S+ neurons of the suprachiasmatic nucleus. These neuroendocrine dopamine cells may contribute to the dopaminergic inhibition of prolactin secretion diurnally, as their neuromedin S+ inputs originate from neurons expressing Per2 and Per3 and their tyrosine hydroxylase phosphorylation is regulated in a circadian fashion. Overall, our catalog of neuronal subclasses provides new understanding of hypothalamic organization and function.
Collapse
Affiliation(s)
- Roman A. Romanov
- Department of Molecular Neurosciences, Center for Brain Research, Medical University of Vienna, Vienna, Austria
| | - Amit Zeisel
- Division of Molecular Neurobiology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Joanne Bakker
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Fatima Girach
- Department of Molecular Neurosciences, Center for Brain Research, Medical University of Vienna, Vienna, Austria
| | - Arash Hellysaz
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Raju Tomer
- Department of Bioengineering & CNC Program, Stanford University, Stanford, CA, USA
| | - Alán Alpár
- MTA-SE NAP Research Group of Experimental Neuroanatomy and Developmental Biology, Hungarian Academy of Sciences, Budapest, Hungary
- Department of Anatomy, Semmelweis University, Budapest, Hungary
| | - Jan Mulder
- Science for Life Laboratories, Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Frédéric Clotman
- Laboratory of Neural Differentiation, Institute of Neuroscience, Université Catholique de Louvain, Brussels, Belgium
| | - Erik Keimpema
- Department of Molecular Neurosciences, Center for Brain Research, Medical University of Vienna, Vienna, Austria
| | - Brian Hsueh
- Department of Bioengineering & CNC Program, Stanford University, Stanford, CA, USA
| | - Ailey K. Crow
- Department of Bioengineering & CNC Program, Stanford University, Stanford, CA, USA
| | | | - Christian Schwindling
- Microscopy Labs Munich, Global Sales Support-Life Sciences, Carl Zeiss Microscopy GmbH, Munich, Germany
| | - Daniela Calvigioni
- Department of Molecular Neurosciences, Center for Brain Research, Medical University of Vienna, Vienna, Austria
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Jaideep S. Bains
- The Hotchkiss Brain Institute, University of Calgary, Calgary, Canada
| | - Zoltán Máté
- Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest, Hungary
| | - Gábor Szabó
- Institute of Experimental Medicine, Hungarian Academy of Sciences, Budapest, Hungary
| | - Yuchio Yanagawa
- Department of Genetic and Behavioral Neuroscience, Gunma University Graduate School of Medicine, Maebashi 371-8511, Japan
| | - Mingdong Zhang
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Andre Rendeiro
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Matthias Farlik
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Mathias Uhlén
- Science for Life Laboratory, Albanova University Center, Royal Institute of Technology, Stockholm, Sweden
| | - Peer Wulff
- Institute of Physiology, Christian Albrechts University, Kiel, Germany
| | - Christoph Bock
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | | | - Karl Deisseroth
- Department of Bioengineering & CNC Program, Stanford University, Stanford, CA, USA
| | - Tomas Hökfelt
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Sten Linnarsson
- Division of Molecular Neurobiology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Tamas L. Horvath
- Program in Integrative Cell Signaling and Neurobiology of Metabolism, Section of Comparative Medicine, Yale University School of Medicine, New Haven, CT, USA
| | - Tibor Harkany
- Department of Molecular Neurosciences, Center for Brain Research, Medical University of Vienna, Vienna, Austria
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| |
Collapse
|
13
|
Hendriks JCJ, Hamers ET, Martens H. [A man with Bowen disease of the nail]. Ned Tijdschr Geneeskd 2017; 161:D933. [PMID: 28294928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We describe a 40-year-old male patient with a 2-year history of a sensitive fingernail of the right hand. The nail had partly a rough surface, longitudinal cleavage and was brittle and vulnerable at the tip. Biopsy of the nail showed a Bowen disease (squamous cell carcinoma in situ) of the nail.
Collapse
|
14
|
Ott C, Martens H, Hassouna I, Oliveira B, Erck C, Zafeiriou MP, Peteri UK, Hesse D, Gerhart S, Altas B, Kolbow T, Stadler H, Kawabe H, Zimmermann WH, Nave KA, Schulz-Schaeffer W, Jahn O, Ehrenreich H. Erratum to: Widespread Expression of Erythropoietin Receptor in Brain and Its Induction by Injury. Mol Med 2015. [DOI: 10.2119/molmed.2015.00192.erratum] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
|
15
|
Dillenseger A, Schulze S, Martens H, Schmidt MJ. [Central pattern generators in the spinal cord of the cat and their relevance in rehabilitation after spinal lesion]. Tierarztl Prax Ausg K Kleintiere Heimtiere 2015; 44:39-46. [PMID: 26530110 DOI: 10.15654/tpk-140729] [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] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Accepted: 10/01/2015] [Indexed: 11/13/2022]
Abstract
The ability of the spinal cord to recover after partial or complete transection, and even reinitiate motor function, was investigated in several studies in cats. It has been shown that even after a complete spinalisation at the level of T12/T13, the possibility of restoration of hind-limb function is good. Central pattern generators (CPGs), located in the spinal cord, play an important role in this situation. Although CPGs alone are unable to restore function, the combination of CPGs with targeted and consistent mobility training and, in some cases, hind-limb sensory stimulation is essential to improve function. These result in a reorganisation of the CPGs and neuronal networks in the spinal cord. The age of the animal at the time of injury and the extent and localisation of lesions, play a crucial role in recovery. A new focus of research is the influence of neurotransmitters/neuromodulators on spinal-cord regeneration. How and to what extent these factors support locomotor training remains for further clinical investigation.
Collapse
Affiliation(s)
- A Dillenseger
- Anja Dillenseger, Holbeinstraße 90, 01309 Dresden, E-Mail:
| | | | | | | |
Collapse
|
16
|
Ott C, Martens H, Hassouna I, Oliveira B, Erck C, Zafeiriou MP, Peteri UK, Hesse D, Gerhart S, Altas B, Kolbow T, Stadler H, Kawabe H, Zimmermann WH, Nave KA, Schulz-Schaeffer W, Jahn O, Ehrenreich H. Widespread Expression of Erythropoietin Receptor in Brain and Its Induction by Injury. Mol Med 2015; 21:803-815. [PMID: 26349059 DOI: 10.2119/molmed.2015.00192] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 09/01/2015] [Indexed: 11/06/2022] Open
Abstract
Erythropoietin (EPO) exerts potent neuroprotective, neuroregenerative and procognitive functions. However, unequivocal demonstration of erythropoietin receptor (EPOR) expression in brain cells has remained difficult since previously available anti-EPOR antibodies (EPOR-AB) were unspecific. We report here a new, highly specific, polyclonal rabbit EPOR-AB directed against different epitopes in the cytoplasmic tail of human and murine EPOR and its characterization by mass spectrometric analysis of immuno-precipitated endogenous EPOR, Western blotting, immunostaining and flow cytometry. Among others, we applied genetic strategies including overexpression, Lentivirus-mediated conditional knockout of EpoR and tagged proteins, both on cultured cells and tissue sections, as well as intracortical implantation of EPOR-transduced cells to verify specificity. We show examples of EPOR expression in neurons, oligodendroglia, astrocytes and microglia. Employing this new EPOR-AB with double-labeling strategies, we demonstrate membrane expression of EPOR as well as its localization in intracellular compartments such as the Golgi apparatus. Moreover, we show injury-induced expression of EPOR. In mice, a stereotactically applied stab wound to the motor cortex leads to distinct EpoR expression by reactive GFAP-expressing cells in the lesion vicinity. In a patient suffering from epilepsy, neurons and oligodendrocytes of the hippocampus strongly express EPOR. To conclude, this new analytical tool will allow neuroscientists to pinpoint EPOR expression in cells of the nervous system and to better understand its role in healthy conditions, including brain development, as well as under pathological circumstances, such as upregulation upon distress and injury.
Collapse
Affiliation(s)
- Christoph Ott
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | | | - Imam Hassouna
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany.,Physiology Unit, Zoology Department, Faculty of Science, Menoufia University, Egypt
| | - Bárbara Oliveira
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | | | | | - Ulla-Kaisa Peteri
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Dörte Hesse
- Proteomics Group, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Simone Gerhart
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - Bekir Altas
- Molecular Neurobiology, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | | | | | - Hiroshi Kawabe
- Molecular Neurobiology, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | | | - Klaus-Armin Nave
- Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany.,DFG Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany
| | | | - Olaf Jahn
- Proteomics Group, Max Planck Institute of Experimental Medicine, Göttingen, Germany.,DFG Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany
| | - Hannelore Ehrenreich
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany.,DFG Center for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany
| |
Collapse
|
17
|
Frencken KJA, Hacking MNK, Brinkhuizen T, Abdul Hamid MA, Martens H. Soft yellowish papules on the neck: a clinicopathological challenge. Clin Exp Dermatol 2015; 41:218-20. [PMID: 26243536 DOI: 10.1111/ced.12705] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/11/2014] [Indexed: 11/30/2022]
Affiliation(s)
- K J A Frencken
- Department of Dermatology, Maastricht University Medical Centre, Maastricht, the Netherlands.,GROW, School for Oncology and Developmental Biology, Maastricht University, Maastricht, the Netherlands
| | - M N K Hacking
- Department of Dermatology, Catharina Hospital Eindhoven, Eindhoven, the Netherlands
| | - T Brinkhuizen
- Department of Dermatology, Maastricht University Medical Centre, Maastricht, the Netherlands.,GROW, School for Oncology and Developmental Biology, Maastricht University, Maastricht, the Netherlands
| | - M A Abdul Hamid
- Department of Pathology, Maastricht University Medical Centre, Maastricht, the Netherlands
| | - H Martens
- Department of Dermatology, Maastricht University Medical Centre, Maastricht, the Netherlands.,Department of Dermatology, Catharina Hospital Eindhoven, Eindhoven, the Netherlands
| |
Collapse
|
18
|
Stein H, Bob R, Dürkop H, Erck C, Kämpfe D, Kvasnicka HM, Martens H, Roth A, Streubel A. A new monoclonal antibody (CAL2) detects CALRETICULIN mutations in formalin-fixed and paraffin-embedded bone marrow biopsies. Leukemia 2015. [PMID: 26202929 PMCID: PMC4705422 DOI: 10.1038/leu.2015.192] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [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] [Indexed: 01/12/2023]
Abstract
Recent advances in the diagnostic of myeloproliferative neoplasms (MPNs) discovered CALRETICULIN (CALR) mutations as a major driver in these disorders. In contrast to JAK2 mutations being mainly associated with polycythaemia vera, CALR mutations are only associated with primary myelofibrosis (PMF) and essential thrombocythaemia (ET). CALR mutations are present in the majority of PMF and ET patients lacking JAK2 and MPL mutations. As these CALR mutations are absent from reactive bone marrow (BM) lesions their presence indicates ET or PMF. So far these mutations are detectable only by molecular assays. Their molecular detection is cumbersome because of the great CALR mutation heterogeneity. Therefore, the availability of a simple assay would be of great help. All CALR mutations reported lead to a frameshift generating a new 36 amino-acid C-terminus. We generated a monoclonal antibody (CAL2) to this C-neoterminus by immunizing mice with a representative peptide and compared its performance with Sanger sequencing data in 173 MPNs and other BM diseases. There was a 100% correlation between the molecular and the CAL2 immunohistochemical (IHC) assays. Thus, the detection of CALR mutations by the CAL2 IHC is a specific, sensitive, rapid, simple and low-cost method.
Collapse
Affiliation(s)
- H Stein
- Reference and Consultation Center for Lymphoma and Haematopathology, Pathodiagnostik Berlin, Berlin, Germany
| | - R Bob
- Reference and Consultation Center for Lymphoma and Haematopathology, Pathodiagnostik Berlin, Berlin, Germany
| | - H Dürkop
- Reference and Consultation Center for Lymphoma and Haematopathology, Pathodiagnostik Berlin, Berlin, Germany
| | - C Erck
- Synaptic Systems GmbH, Göttingen, Germany
| | - D Kämpfe
- Praxis für Onkologie, Lüdenscheid, Germany
| | - H-M Kvasnicka
- Senckenbergisches Institut für Pathologie, Johann Wolfgang Goethe-Universität, Frankfurt am Main, Germany
| | - H Martens
- Synaptic Systems GmbH, Göttingen, Germany
| | - A Roth
- Medizinisches Versorgungszentrum am Helios Klinikum Emil von Behring, Labor für molekulare Diagnostik und Mikrobiologie, Berlin, Germany
| | - A Streubel
- Medizinisches Versorgungszentrum am Helios Klinikum Emil von Behring, Labor für molekulare Diagnostik und Mikrobiologie, Berlin, Germany
| |
Collapse
|
19
|
Binotti B, Pavlos NJ, Riedel D, Wenzel D, Vorbrüggen G, Schalk AM, Kühnel K, Boyken J, Erck C, Martens H, Chua JJE, Jahn R. The GTPase Rab26 links synaptic vesicles to the autophagy pathway. eLife 2015; 4:e05597. [PMID: 25643395 PMCID: PMC4337689 DOI: 10.7554/elife.05597] [Citation(s) in RCA: 127] [Impact Index Per Article: 14.1] [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: 11/13/2014] [Accepted: 02/01/2015] [Indexed: 12/27/2022] Open
Abstract
Small GTPases of the Rab family not only regulate target recognition in membrane traffic but also control other cellular functions such as cytoskeletal transport and autophagy. Here we show that Rab26 is specifically associated with clusters of synaptic vesicles in neurites. Overexpression of active but not of GDP-preferring Rab26 enhances vesicle clustering, which is particularly conspicuous for the EGFP-tagged variant, resulting in a massive accumulation of synaptic vesicles in neuronal somata without altering the distribution of other organelles. Both endogenous and induced clusters co-localize with autophagy-related proteins such as Atg16L1, LC3B and Rab33B but not with other organelles. Furthermore, Atg16L1 appears to be a direct effector of Rab26 and binds Rab26 in its GTP-bound form, albeit only with low affinity. We propose that Rab26 selectively directs synaptic and secretory vesicles into preautophagosomal structures, suggesting the presence of a novel pathway for degradation of synaptic vesicles. DOI:http://dx.doi.org/10.7554/eLife.05597.001 Our brain contains billions of cells called neurons that form an extensive network through which information is readily exchanged. These cells connect to each other via junctions called synapses. Our developing brain starts off with far more synapses than it needs, but the excess synapses are destroyed as the brain matures. Even in adults, synapses are continuously made and destroyed in response to experiences and learning. Inside neurons there are tiny bubble-like compartments called vesicles that supply the synapses with many of the proteins and other components that they need. There is a growing body of evidence that suggests these vesicles are rapidly destroyed once a synapse is earmarked for destruction, but it is not clear how this may occur. Here, Binotti, Pavlos et al. found that a protein called Rab26 sits on the surface of the vesicles near synapses. This protein promotes the formation of clusters of vesicles, and a membrane sometimes surrounds these clusters. Further experiments indicate that several proteins involved in a process called autophagy—where unwanted proteins and debris are destroyed—may also be found around the clusters of vesicles. Autophagy starts with the formation of a membrane around the material that needs to be destroyed. This seals the material off from rest of the cell so that enzymes can safely break it down. Binotti, Pavlos et al. found that one of the autophagy proteins—called Atg16L—can bind directly to Rab26, but only when Rab26 is in an ‘active’ state. These findings suggest that excess vesicles at synapses may be destroyed by autophagy. Further work will be required to establish how this process is controlled and how it is involved in the loss of synapses. DOI:http://dx.doi.org/10.7554/eLife.05597.002
Collapse
Affiliation(s)
- Beyenech Binotti
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Nathan J Pavlos
- School of Surgery, University of Western Australia, Crawley, Australia
| | - Dietmar Riedel
- Facility for Transmission Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Dirk Wenzel
- Facility for Transmission Electron Microscopy, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Gerd Vorbrüggen
- Research Group Molecular Cell Dynamics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Amanda M Schalk
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Karin Kühnel
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Janina Boyken
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | | | | | - John J E Chua
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Reinhard Jahn
- Department of Neurobiology, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| |
Collapse
|
20
|
Reichel JM, Nissel S, Rogel-Salazar G, Mederer A, Käfer K, Bedenk BT, Martens H, Anders R, Grosche J, Michalski D, Härtig W, Wotjak CT. Distinct behavioral consequences of short-term and prolonged GABAergic depletion in prefrontal cortex and dorsal hippocampus. Front Behav Neurosci 2015; 8:452. [PMID: 25628548 PMCID: PMC4292780 DOI: 10.3389/fnbeh.2014.00452] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [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: 09/11/2014] [Accepted: 12/17/2014] [Indexed: 11/13/2022] Open
Abstract
GABAergic interneurons are essential for a functional equilibrium between excitatory and inhibitory impulses throughout the CNS. Disruption of this equilibrium can lead to various neurological or neuropsychiatric disorders such as epilepsy or schizophrenia. Schizophrenia itself is clinically defined by negative (e.g., depression) and positive (e.g., hallucinations) symptoms as well as cognitive dysfunction. GABAergic interneurons are proposed to play a central role in the etiology and progression of schizophrenia; however, the specific mechanisms and the time-line of symptom development as well as the distinct involvement of cortical and hippocampal GABAergic interneurons in the etiology of schizophrenia-related symptoms are still not conclusively resolved. Previous work demonstrated that GABAergic interneurons can be selectively depleted in adult mice by means of saporin-conjugated anti-vesicular GABA transporter antibodies (SAVAs) in vitro and in vivo. Given their involvement in schizophrenia-related disease etiology, we ablated GABAergic interneurons in the medial prefrontal cortex (mPFC) and dorsal hippocampus (dHPC) in adult male C57BL/6N mice. Subsequently we assessed alterations in anxiety, sensory processing, hyperactivity and cognition after long-term (>14 days) and short-term (<14 days) GABAergic depletion. Long-term GABAergic depletion in the mPFC resulted in a decrease in sensorimotor-gating and impairments in cognitive flexibility. Notably, the same treatment at the level of the dHPC completely abolished spatial learning capabilities. Short-term GABAergic depletion in the dHPC revealed a transient hyperactive phenotype as well as marked impairments regarding the acquisition of a spatial memory. In contrast, recall of a spatial memory was not affected by the same intervention. These findings emphasize the importance of functional local GABAergic networks for the encoding but not the recall of hippocampus-dependent spatial memories.
Collapse
Affiliation(s)
- Judith M Reichel
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Research Group "Neuronal Plasticity" Munich, Germany
| | - Sabine Nissel
- Paul Flechsig Institute for Brain Research, University of Leipzig Leipzig, Germany
| | - Gabriela Rogel-Salazar
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Research Group "Neuronal Plasticity" Munich, Germany
| | - Anna Mederer
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Research Group "Neuronal Plasticity" Munich, Germany
| | - Karola Käfer
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Research Group "Neuronal Plasticity" Munich, Germany
| | - Benedikt T Bedenk
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Research Group "Neuronal Plasticity" Munich, Germany
| | | | - Rebecca Anders
- Paul Flechsig Institute for Brain Research, University of Leipzig Leipzig, Germany
| | - Jens Grosche
- Paul Flechsig Institute for Brain Research, University of Leipzig Leipzig, Germany ; Effigos AG Leipzig, Germany
| | | | - Wolfgang Härtig
- Paul Flechsig Institute for Brain Research, University of Leipzig Leipzig, Germany
| | - Carsten T Wotjak
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Research Group "Neuronal Plasticity" Munich, Germany
| |
Collapse
|
21
|
Romanov RA, Alpár A, Zhang MD, Zeisel A, Calas A, Landry M, Fuszard M, Shirran SL, Schnell R, Dobolyi Á, Oláh M, Spence L, Mulder J, Martens H, Palkovits M, Uhlen M, Sitte HH, Botting CH, Wagner L, Linnarsson S, Hökfelt T, Harkany T. A secretagogin locus of the mammalian hypothalamus controls stress hormone release. EMBO J 2014; 34:36-54. [PMID: 25430741 DOI: 10.15252/embj.201488977] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
A hierarchical hormonal cascade along the hypothalamic-pituitary-adrenal axis orchestrates bodily responses to stress. Although corticotropin-releasing hormone (CRH), produced by parvocellular neurons of the hypothalamic paraventricular nucleus (PVN) and released into the portal circulation at the median eminence, is known to prime downstream hormone release, the molecular mechanism regulating phasic CRH release remains poorly understood. Here, we find a cohort of parvocellular cells interspersed with magnocellular PVN neurons expressing secretagogin. Single-cell transcriptome analysis combined with protein interactome profiling identifies secretagogin neurons as a distinct CRH-releasing neuron population reliant on secretagogin's Ca(2+) sensor properties and protein interactions with the vesicular traffic and exocytosis release machineries to liberate this key hypothalamic releasing hormone. Pharmacological tools combined with RNA interference demonstrate that secretagogin's loss of function occludes adrenocorticotropic hormone release from the pituitary and lowers peripheral corticosterone levels in response to acute stress. Cumulatively, these data define a novel secretagogin neuronal locus and molecular axis underpinning stress responsiveness.
Collapse
Affiliation(s)
- Roman A Romanov
- Department of Medical Biochemistry & Biophysics, Karolinska Institutet, Stockholm, Sweden Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Alán Alpár
- Department of Medical Biochemistry & Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Ming-Dong Zhang
- Department of Medical Biochemistry & Biophysics, Karolinska Institutet, Stockholm, Sweden Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Amit Zeisel
- Department of Medical Biochemistry & Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - André Calas
- Laboratory for Central Mechanisms of Pain Sensitization, Interdisciplinary Institute for Neuroscience, CNRS UMR 5297 Université Bordeaux 2, Bordeaux, France
| | - Marc Landry
- Laboratory for Central Mechanisms of Pain Sensitization, Interdisciplinary Institute for Neuroscience, CNRS UMR 5297 Université Bordeaux 2, Bordeaux, France
| | - Matthew Fuszard
- School of Chemistry, University of St. Andrews, St. Andrews, UK
| | - Sally L Shirran
- School of Chemistry, University of St. Andrews, St. Andrews, UK
| | - Robert Schnell
- Department of Medical Biochemistry & Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Árpád Dobolyi
- Department of Anatomy, Semmelweis University, Budapest, Hungary
| | - Márk Oláh
- Department of Human Morphology and Developmental Biology, Semmelweis University, Budapest, Hungary
| | - Lauren Spence
- Institute of Medical Sciences, University of Aberdeen, Aberdeen, UK
| | - Jan Mulder
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden Science for Life Laboratory, Karolinska Institutet, Stockholm, Sweden
| | | | - Miklós Palkovits
- Human Brain Tissue Bank and Laboratory, Semmelweis University, Budapest, Hungary
| | - Mathias Uhlen
- Science for Life Laboratory, Albanova University Center, Royal Institute of Technology, Stockholm, Sweden
| | - Harald H Sitte
- Center for Physiology and Pharmacology, Institute of Pharmacology Medical University of Vienna, Vienna, Austria
| | | | - Ludwig Wagner
- University Clinic for Internal Medicine III General Hospital Vienna, Vienna, Austria
| | - Sten Linnarsson
- Department of Medical Biochemistry & Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Tomas Hökfelt
- Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden
| | - Tibor Harkany
- Department of Medical Biochemistry & Biophysics, Karolinska Institutet, Stockholm, Sweden Department of Molecular Neurosciences, Center for Brain Research, Medical University of Vienna, Vienna, Austria
| |
Collapse
|
22
|
Reinert J, Martens H, Huettenrauch M, Kolbow T, Lannfelt L, Ingelsson M, Paetau A, Verkkoniemi-Ahola A, Bayer TA, Wirths O. Aβ38 in the brains of patients with sporadic and familial Alzheimer's disease and transgenic mouse models. J Alzheimers Dis 2014; 39:871-81. [PMID: 24305500 DOI: 10.3233/jad-131373] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The pathogenesis of Alzheimer's disease (AD) is believed to be closely dependent on deposits of neurotoxic amyloid-β peptides (Aβ), which become abundantly present throughout the central nervous system in advanced stages of the disease. The different Aβ peptides existing are generated by subsequent cleavage of the amyloid-β protein precursor (AβPP) and may vary in length and differ at their C-terminus. Despite extensive studies on the most prevalent species Aβ40 and Aβ42, Aβ peptides with other C-termini such as Aβ38 have not received much attention. In the present study, we used a highly specific and sensitive antibody against Aβ38 to analyze the distribution of this Aβ species in cases of sporadic and familial AD, as well as in the brains of a series of established transgenic AD mouse models. We found Aβ38 to be present as vascular deposits in the brains of the majority of sporadic AD cases, whereas it is largely absent in non-demented control cases. Aβ38-positive extracellular plaques were virtually limited to familial cases. Interestingly we observed Aβ38-positive plaques not only among familial cases due to AβPP mutations, but also in cases of familial AD caused by presenilin (PSEN) mutations. Furthermore we demonstrate that Aβ38 deposits in the form of extracellular plaques are common in several AD transgenic mouse models carrying either only AβPP, or combinations of AβPP, PSEN1, and tau transgenes.
Collapse
Affiliation(s)
- Jochim Reinert
- Division of Molecular Psychiatry, Department of Psychiatry, University Medicine Goettingen, Goettingen, Germany
| | | | - Melanie Huettenrauch
- Division of Molecular Psychiatry, Department of Psychiatry, University Medicine Goettingen, Goettingen, Germany
| | | | - Lars Lannfelt
- Department of Public Health/Geriatrics, Uppsala University, Uppsala, Sweden
| | - Martin Ingelsson
- Department of Public Health/Geriatrics, Uppsala University, Uppsala, Sweden
| | - Anders Paetau
- Department of Pathology, University and University Hospital of Helsinki, Helsinki, Finland
| | | | - Thomas A Bayer
- Division of Molecular Psychiatry, Department of Psychiatry, University Medicine Goettingen, Goettingen, Germany
| | - Oliver Wirths
- Division of Molecular Psychiatry, Department of Psychiatry, University Medicine Goettingen, Goettingen, Germany
| |
Collapse
|
23
|
Hammer C, Stepniak B, Schneider A, Papiol S, Tantra M, Begemann M, Sirén AL, Pardo LA, Sperling S, Mohd Jofrry S, Gurvich A, Jensen N, Ostmeier K, Lühder F, Probst C, Martens H, Gillis M, Saher G, Assogna F, Spalletta G, Stöcker W, Schulz TF, Nave KA, Ehrenreich H. Neuropsychiatric disease relevance of circulating anti-NMDA receptor autoantibodies depends on blood-brain barrier integrity. Mol Psychiatry 2014; 19:1143-9. [PMID: 23999527 DOI: 10.1038/mp.2013.110] [Citation(s) in RCA: 255] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Revised: 07/19/2013] [Accepted: 07/22/2013] [Indexed: 12/24/2022]
Abstract
In 2007, a multifaceted syndrome, associated with anti-NMDA receptor autoantibodies (NMDAR-AB) of immunoglobulin-G isotype, has been described, which variably consists of psychosis, epilepsy, cognitive decline and extrapyramidal symptoms. Prevalence and significance of NMDAR-AB in complex neuropsychiatric disease versus health, however, have remained unclear. We tested sera of 2817 subjects (1325 healthy, 1081 schizophrenic, 263 Parkinson and 148 affective-disorder subjects) for presence of NMDAR-AB, conducted a genome-wide genetic association study, comparing AB carriers versus non-carriers, and assessed their influenza AB status. For mechanistic insight and documentation of AB functionality, in vivo experiments involving mice with deficient blood-brain barrier (ApoE(-/-)) and in vitro endocytosis assays in primary cortical neurons were performed. In 10.5% of subjects, NMDAR-AB (NR1 subunit) of any immunoglobulin isotype were detected, with no difference in seroprevalence, titer or in vitro functionality between patients and healthy controls. Administration of extracted human serum to mice influenced basal and MK-801-induced activity in the open field only in ApoE(-/-) mice injected with NMDAR-AB-positive serum but not in respective controls. Seropositive schizophrenic patients with a history of neurotrauma or birth complications, indicating an at least temporarily compromised blood-brain barrier, had more neurological abnormalities than seronegative patients with comparable history. A common genetic variant (rs524991, P=6.15E-08) as well as past influenza A (P=0.024) or B (P=0.006) infection were identified as predisposing factors for NMDAR-AB seropositivity. The >10% overall seroprevalence of NMDAR-AB of both healthy individuals and patients is unexpectedly high. Clinical significance, however, apparently depends on association with past or present perturbations of blood-brain barrier function.
Collapse
Affiliation(s)
- C Hammer
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - B Stepniak
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - A Schneider
- 1] Department of Psychiatry & Psychotherapy, University Medicine Göttingen, Göttingen, Germany [2] DFG Research Center Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany [3] German Center for Neurodegenerative Diseases (DZNE), Göttingen, Germany
| | - S Papiol
- 1] Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany [2] DFG Research Center Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany
| | - M Tantra
- 1] Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany [2] DFG Research Center Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany
| | - M Begemann
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - A-L Sirén
- Department of Neurosurgery, University Clinic of Würzburg, Würzburg, Germany
| | - L A Pardo
- Department of Molecular Biology of Neuronal Signals, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - S Sperling
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - S Mohd Jofrry
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - A Gurvich
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - N Jensen
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - K Ostmeier
- Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - F Lühder
- Department of Neuroimmunology, Institute for Multiple Sclerosis Research and Hertie Foundation, University Medicine Göttingen, Göttingen, Germany
| | - C Probst
- Institute for Experimental Immunology, affiliated to Euroimmun, Lübeck, Germany
| | - H Martens
- Synaptic Systems GmbH, Göttingen, Germany
| | - M Gillis
- Institute of Virology, Hannover Medical School, Hannover, Germany
| | - G Saher
- Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - F Assogna
- Department of Clinical and Behavioral Neurology, IRCCS Santa Lucia Foundation, Rome, Italy
| | - G Spalletta
- Department of Clinical and Behavioral Neurology, IRCCS Santa Lucia Foundation, Rome, Italy
| | - W Stöcker
- Institute for Experimental Immunology, affiliated to Euroimmun, Lübeck, Germany
| | - T F Schulz
- Institute of Virology, Hannover Medical School, Hannover, Germany
| | - K-A Nave
- 1] DFG Research Center Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany [2] Department of Neurogenetics, Max Planck Institute of Experimental Medicine, Göttingen, Germany
| | - H Ehrenreich
- 1] Clinical Neuroscience, Max Planck Institute of Experimental Medicine, Göttingen, Germany [2] DFG Research Center Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), Göttingen, Germany
| |
Collapse
|
24
|
Werner Omazic A, Kronqvist C, Zhongyan L, Martens H, Holtenius K. The fate of glycerol entering the rumen of dairy cows and sheep. J Anim Physiol Anim Nutr (Berl) 2014; 99:258-64. [DOI: 10.1111/jpn.12245] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 08/07/2014] [Indexed: 11/27/2022]
Affiliation(s)
- A. Werner Omazic
- Department of Animal Nutrition and Management; Swedish University of Agricultural Sciences; Uppsala Sweden
| | - C. Kronqvist
- Department of Animal Nutrition and Management; Swedish University of Agricultural Sciences; Uppsala Sweden
| | - L. Zhongyan
- Department of Veterinary Physiology; Free University of Berlin; Berlin Germany
| | - H. Martens
- Department of Veterinary Physiology; Free University of Berlin; Berlin Germany
| | - K. Holtenius
- Department of Animal Nutrition and Management; Swedish University of Agricultural Sciences; Uppsala Sweden
| |
Collapse
|
25
|
Gefeller EM, Martens H, Aschenbach JR, Klingspor S, Twardziok S, Wrede P, Pieper R, Lodemann U. Effects of age and zinc supplementation on transport properties in the jejunum of piglets. J Anim Physiol Anim Nutr (Berl) 2014; 99:542-52. [DOI: 10.1111/jpn.12232] [Citation(s) in RCA: 8] [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] [Received: 04/25/2013] [Accepted: 06/30/2014] [Indexed: 11/29/2022]
Affiliation(s)
- E. M. Gefeller
- Faculty of Veterinary Medicine; Institute of Veterinary Physiology; Freie Universität Berlin; Berlin Germany
| | - H. Martens
- Faculty of Veterinary Medicine; Institute of Veterinary Physiology; Freie Universität Berlin; Berlin Germany
| | - J. R. Aschenbach
- Faculty of Veterinary Medicine; Institute of Veterinary Physiology; Freie Universität Berlin; Berlin Germany
| | - S. Klingspor
- Faculty of Veterinary Medicine; Institute of Veterinary Physiology; Freie Universität Berlin; Berlin Germany
| | - S. Twardziok
- Molecular Biology and Bioinformatic; Charité - Universitätsmedizin Berlin; Berlin Germany
| | - P. Wrede
- Molecular Biology and Bioinformatic; Charité - Universitätsmedizin Berlin; Berlin Germany
| | - R. Pieper
- Faculty of Veterinary Medicine; Institute of Animal Nutrition; Freie Universität Berlin; Berlin Germany
| | - U. Lodemann
- Faculty of Veterinary Medicine; Institute of Veterinary Physiology; Freie Universität Berlin; Berlin Germany
| |
Collapse
|
26
|
Dahm L, Ott C, Steiner J, Stepniak B, Teegen B, Saschenbrecker S, Hammer C, Borowski K, Begemann M, Lemke S, Rentzsch K, Probst C, Martens H, Wienands J, Spalletta G, Weissenborn K, Stöcker W, Ehrenreich H. Seroprevalence of autoantibodies against brain antigens in health and disease. Ann Neurol 2014; 76:82-94. [DOI: 10.1002/ana.24189] [Citation(s) in RCA: 250] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Revised: 05/19/2014] [Accepted: 05/19/2014] [Indexed: 01/17/2023]
Affiliation(s)
- Liane Dahm
- Clinical Neuroscience; Max Planck Institute of Experimental Medicine; Göttingen Germany
| | - Christoph Ott
- Clinical Neuroscience; Max Planck Institute of Experimental Medicine; Göttingen Germany
| | - Johann Steiner
- Department of Psychiatry; University of Magdeburg; Magdeburg Germany
- Center for Behavioral Brain Sciences; Magdeburg Germany
| | - Beata Stepniak
- Clinical Neuroscience; Max Planck Institute of Experimental Medicine; Göttingen Germany
| | - Bianca Teegen
- Institute for Experimental Immunology, affiliated with Euroimmun; Lübeck Germany
| | | | - Christian Hammer
- Clinical Neuroscience; Max Planck Institute of Experimental Medicine; Göttingen Germany
| | - Kathrin Borowski
- Institute for Experimental Immunology, affiliated with Euroimmun; Lübeck Germany
| | - Martin Begemann
- Clinical Neuroscience; Max Planck Institute of Experimental Medicine; Göttingen Germany
| | - Sandra Lemke
- Institute for Experimental Immunology, affiliated with Euroimmun; Lübeck Germany
| | - Kristin Rentzsch
- Institute for Experimental Immunology, affiliated with Euroimmun; Lübeck Germany
| | - Christian Probst
- Institute for Experimental Immunology, affiliated with Euroimmun; Lübeck Germany
| | | | - Jürgen Wienands
- Institute for Cellular and Molecular Immunology; Georg August University; Göttingen Germany
| | - Gianfranco Spalletta
- Department of Clinical and Behavioral Neurology; IRCCS Santa Lucia Foundation; Rome Italy
| | | | - Winfried Stöcker
- Institute for Experimental Immunology, affiliated with Euroimmun; Lübeck Germany
| | - Hannelore Ehrenreich
- Clinical Neuroscience; Max Planck Institute of Experimental Medicine; Göttingen Germany
- DFG Center for Nanoscale Microscopy and Molecular Physiology of the Brain; Göttingen Germany
| |
Collapse
|
27
|
Twardziok SO, Pieper R, Aschenbach JR, Bednorz C, Brockmann GA, Fromm M, Klingspor S, Kreuzer S, Lodemann U, Martens H, Martin L, Richter JF, Scharek-Tedin L, Siepert BF, Starke IC, Tedin K, Vahjen W, Wieler LH, Zakrzewski SS, Zentek J, Wrede P. Cross-talk Between Host, Microbiome and Probiotics: A Systems Biology Approach for Analyzing the Effects of Probiotic Enterococcus faecium NCIMB 10415 in Piglets. Mol Inform 2014; 33:171-82. [PMID: 27485687 DOI: 10.1002/minf.201300147] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 09/18/2013] [Accepted: 01/06/2014] [Indexed: 02/05/2023]
Abstract
A comprehensive data-set from a multidisciplinary feeding experiment with the probiotic Enterococcus faecium was analyzed to elucidate effects of the probiotic on growing piglets. Sixty-two piglets were randomly assigned to a control (no probiotic treatment) and a treatment group (E. faecium supplementation). Piglets were weaned at 26 d. Age-matched piglets were sacrificed for the collection of tissue samples at 12, 26, 34 and 54 d. In addition to zootechnical data, the composition and activity of intestinal microbiota, immune cell types, and intestinal responses were determined. Our systems analysis revealed clear effects on several measured variables in 26 and 34 days old animals, while response patterns varied between piglets from different age groups. Correlation analyses identified reduced associations between intestinal microbial communities and immune system reactions in the probiotic group. In conclusion, the developed model is useful for comparative analyses to unravel systems effects of dietary components and their time resolution. The model identified that effects of E. faecium supplementation most prominently affected the interplay between intestinal microbiota and the intestinal immune system. These effects, as well as effects in other subsystems, clustered around weaning, which is the age where piglets are most prone to diarrhea.
Collapse
Affiliation(s)
- S O Twardziok
- Molekularbiologie und Bioinformatik, Charité - Universitätsmedizin Berlin, Arnimallee 22, 14195 Berlin, Germany.
| | - R Pieper
- Institut für Tierernährung, Freie Universität Berlin, Berlin, Germany
| | - J R Aschenbach
- Institut für Veterinär-Physiologie, Freie Universität Berlin, Berlin, Germany
| | - C Bednorz
- Institut für Mikrobiologie und Tierseuchen, Freie Universität Berlin, Berlin, Germany
| | - G A Brockmann
- Züchtungsbiologie und molekulare Tierzüchtung,Humboldt Universität Berlin, Berlin, Germany
| | - M Fromm
- Institut für Klinische Physiologie, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - S Klingspor
- Institut für Veterinär-Physiologie, Freie Universität Berlin, Berlin, Germany
| | - S Kreuzer
- Züchtungsbiologie und molekulare Tierzüchtung,Humboldt Universität Berlin, Berlin, Germany
| | - U Lodemann
- Institut für Veterinär-Physiologie, Freie Universität Berlin, Berlin, Germany
| | - H Martens
- Institut für Veterinär-Physiologie, Freie Universität Berlin, Berlin, Germany
| | - L Martin
- Institut für Tierernährung, Freie Universität Berlin, Berlin, Germany
| | - J F Richter
- Institut für Klinische Physiologie, Charité - Universitätsmedizin Berlin, Berlin, Germany.,Institut für Anatomie II, Universitätsklinikum Jena, Jena, Germany
| | - L Scharek-Tedin
- Institut für Tierernährung, Freie Universität Berlin, Berlin, Germany
| | - B F Siepert
- Institut für Mikrobiologie und Tierseuchen, Freie Universität Berlin, Berlin, Germany
| | - I C Starke
- Institut für Tierernährung, Freie Universität Berlin, Berlin, Germany
| | - K Tedin
- Institut für Mikrobiologie und Tierseuchen, Freie Universität Berlin, Berlin, Germany
| | - W Vahjen
- Institut für Tierernährung, Freie Universität Berlin, Berlin, Germany
| | - L H Wieler
- Institut für Mikrobiologie und Tierseuchen, Freie Universität Berlin, Berlin, Germany
| | - S S Zakrzewski
- Institut für Klinische Physiologie, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - J Zentek
- Institut für Tierernährung, Freie Universität Berlin, Berlin, Germany
| | - P Wrede
- Molekularbiologie und Bioinformatik, Charité - Universitätsmedizin Berlin, Arnimallee 22, 14195 Berlin, Germany
| |
Collapse
|
28
|
Weber GM, Witschi AKM, Wenk C, Martens H. Triennial Growth Symposium--Effects of dietary 25-hydroxycholecalciferol and cholecalciferol on blood vitamin D and mineral status, bone turnover, milk composition, and reproductive performance of sows. J Anim Sci 2014; 92:899-909. [PMID: 24492559 DOI: 10.2527/jas.2013-7209] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
To evaluate the role of vitamin D3 during gestation and lactation of sows, 2 independent experiments were performed with the aim of investigating sow reproductive performance, milk composition (study 1 only), and changes in blood status of 25-hydroxycholecalciferol (25-OH-D3), 1,25-dihydroxycholecalciferol (1,25-(OH)2-D3; study 2 only), minerals, and bone markers of sows during gestation and lactation. Study 1 comprised 39 primi- and multiparous crossbred sows fed 1 of 3 barley meal-based diets fortified with 200 IU/kg vitamin D3 (NRC, 1998; treatment DL), 2,000 IU/kg vitamin D3 (cholecalciferol; treatment DN), or 50 μg 25-OH-D3 (calcidiol; treatment HD)/kg feed. This study was conducted over a 4-parity period under controlled conditions. Study 2, running over 1 parity only, was performed in a commercial farm with 227 primi- and multiparous sows allocated to 2 dietary treatments: control (CON), receiving 2,000 IU vitamin D3/kg (equivalent to 50 μg/kg) feed (114 sows), and test (HYD), supplemented with 50 μg 25-OH-D3/kg feed (113 sows). Blood samples of sows were collected at 84 and 110d postcoitum and 1, 5, and 33 d postpartum (study 1) and at insemination and 28 and 80 d postinsemination as well as d 5 and 28 postpartum (study 2). Colostrum and milk samples in study 1 were obtained at 1, 9, and 33 d of lactation after oxytocin administration. Plasma 25-OH-D3 concentrations were increased (P < 0.05) in sows receiving 25-OH-D3 (HD and HYD) at any time of sampling whereas circulating plasma concentrations of 1,25-(OH)2-D3, Ca, and P were not affected by treatment. Milk concentrations of Ca and P were similar, but 25-OH-D3 content (except in colostrum) was clearly increased (P< 0.05) when 25-OH-D3 was fed. Most characteristics of sow reproductive performance responded similarly to the 2 sources and levels of vitamin D3, but weight gain of piglets between birth and weaning was decreased (P< 0.05) in offspring of DL and HD sows compared with animals of treatment DN (study 1). In study 2 total litter weight and birth weight per piglet were increased (P< 0.05) with 25-OH-D3 supplementation in comparison with the control (CON). Overall, feeding sows with 25-OH-D3 was considered to improve maternal supply with vitamin D3 and thereby maintain Ca homeostasis during gestation and lactation.
Collapse
Affiliation(s)
- G M Weber
- DSM Nutritional Products Ltd., Nutrition Innovation Center, 4002 Basel, Switzerland
| | | | | | | |
Collapse
|
29
|
Lodemann U, Dillenseger A, Aschenbach JR, Martens H. Effects of age and controlled oral dosing of Enterococcus faecium on epithelial properties in the piglet small intestine. Benef Microbes 2013; 4:335-344. [PMID: 24311317 DOI: 10.3920/bm2013.0004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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] [Indexed: 02/01/2023]
Abstract
Enterococcus faecium NCIMB 10415 is a licensed probiotic for piglets that has been shown to positively affect diarrhoea incidence and to act on transport properties and immunological parameters in the porcine intestine. The aim of the present study was to examine its effects on jejunal absorptive and secretory capacities around weaning. Furthermore, the possible involvement of heat shock proteins in the effects of probiotics on epithelial functions was investigated. A significant part of the probiotic was dosed orally to reduce the variability of intake of the probiotic. The piglets were randomly assigned to a control and a probiotic feeding group, the latter receiving 4.5×109 cfu/day of E. faecium directly into the mouth for 34 days starting after birth. Additionally, their feed was supplemented with the probiotic strain. Piglets were weaned at day 29 after birth. Ussing chamber studies were conducted with the mid-jejunum of piglets aged 14, 28, 31, 35 and 56 days. Changes in short-circuit current (ΔIsc) were measured after stimulation of Na+-coupled absorption with L-glutamine or glucose or with the secretagogue prostaglandin E2 (PGE2). The mRNA expression for SGLT1, CFTR and various heat shock proteins was determined. The transport properties changed significantly with age. The glucose-, L-glutamine- and PGE2-induced changes in Isc were highest at day 31 after birth. No significant differences between the feeding groups were observed. The mRNA of HSP60, HSC70, HSP70 and HSP90 was expressed in the jejunal tissues. The mRNA expression of HSC70 was higher and that of HSP60 was lower in the probiotic group. HSC70 expression increased with age. In conclusion, whereas age effects were observed on absorptive and secretory functions, controlled E. faecium dosing had no measurable effects on these functional parameters in this experimental setup. The possible role of heat shock proteins should be further evaluated.
Collapse
Affiliation(s)
- U Lodemann
- Institute of Veterinary Physiology, Faculty of Veterinary Medicine, Freie Universität Berlin, Oertzenweg 19b, 14163 Berlin, Germany
| | - A Dillenseger
- Institute of Veterinary Physiology, Faculty of Veterinary Medicine, Freie Universität Berlin, Oertzenweg 19b, 14163 Berlin, Germany
| | - J R Aschenbach
- Institute of Veterinary Physiology, Faculty of Veterinary Medicine, Freie Universität Berlin, Oertzenweg 19b, 14163 Berlin, Germany
| | - H Martens
- Institute of Veterinary Physiology, Faculty of Veterinary Medicine, Freie Universität Berlin, Oertzenweg 19b, 14163 Berlin, Germany
| |
Collapse
|
30
|
Klingspor S, Martens H, Caushi D, Twardziok S, Aschenbach JR, Lodemann U. Characterization of the effects of Enterococcus faecium on intestinal epithelial transport properties in piglets. J Anim Sci 2013; 91:1707-18. [PMID: 23345556 DOI: 10.2527/jas.2012-5648] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Probiotics have been shown to have positive effects on growth performance traits and the health of farm animals. The objective of the study was to examine whether the probiotic strain Enterococcus faecium NCIMB 10415 (E. faecium) changes the absorptive and secretory transport and barrier properties of piglet jejunum in vitro and thereby to verify tendencies observed in a former feeding trial with E. faecium. Further aims were to assess a potential mechanism of probiotics by testing effects of IL-α, which is upregulated in the peripheral blood mononuclear cells of E. faecium-supplemented piglets, and to test the hypothesis that IL-1α induces a change in ion transport. Sows and their piglets were randomly assigned to a control group and a probiotic group supplemented with E. faecium. The sows received the probiotic supplemented feed from d 28 before parturition and the piglets from d 12 after birth. Piglets were killed at the age of 12 ± 1, 26 ± 1, 34 ± 1, and 54 ± 1 d. Ussing chamber studies were conducted with isolated mucosae from the mid jejunum. Samples were taken for mRNA expression analysis of sodium-glucose-linked transporter 1 (SGLT1) and cystic fibrosis transmembrane conductance regulator (CFTR). The Na(+)/glucose cotransport was increased in the probiotic group compared with the control group at 26 (P = 0.04) and 54 d of age (P = 0.01). The PGE2-induced short circuit current (Isc) was greater at 54 d of age in the probiotic group compared with the control group (P = 0.03). In addition, effects of age on the absorptive (P < 0.01) and secretory (P < 0.01) capacities were observed. Neither SGLT1 nor CFTR mRNA expression was changed by probiotic supplementation. Mannitol flux rates as a marker of paracellular permeability decreased in both groups with increasing age and were less in the probiotic group at the 26 d of age (P = 0.04), indicating a tighter intestinal barrier. The ΔIsc induced by IL-1α was inhibited by bumetanide (P < 0.01), indicating an induction of Cl(-) secretion. Thus, in this experimental setup, E. faecium increased the absorptive and secretory capacity of jejunal mucosae and enhanced the intestinal barrier. Furthermore, the results indicated that IL-1α induces bumetanide-sensitive chloride secretion. The effects of cytokines as potential mediators of probiotic effects should, therefore, be the subject of further studies.
Collapse
Affiliation(s)
- S Klingspor
- Institute of Veterinary Physiology, Department of Veterinary Medicine, Freie Universität Berlin, 14163 Berlin, Germany
| | | | | | | | | | | |
Collapse
|
31
|
Martens H, Dawoud E, Verachtert H. SYNTHESIS OF AROMA COMPOUNDS BY WORT ENTEROBACTERIA DURING THE FIRST STAGE OF LAMBIC FERMENTATION. Journal of the Institute of Brewing 2013. [DOI: 10.1002/j.2050-0416.1992.tb01126.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
32
|
Martens H, Dawoud E, Verachtert H. WORT ENTEROBACTERIA AND OTHER MICROBIAL POPULATIONS INVOLVED DURING THE FIRST MONTH OF LAMBIC FERMENTATION. Journal of the Institute of Brewing 2013. [DOI: 10.1002/j.2050-0416.1991.tb01082.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
33
|
Martens H, Iserentant D, Verachtert H. MICROBIOLOGICAL ASPECTS OF A MIXED YEAST-BACTERIAL FERMENTATION IN THE PRODUCTION OF A SPECIAL BELGIAN ACIDIC ALE. Journal of the Institute of Brewing 2013. [DOI: 10.1002/j.2050-0416.1997.tb00939.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
34
|
Lodemann U, Einspanier R, Scharfen F, Martens H, Bondzio A. Effects of zinc on epithelial barrier properties and viability in a human and a porcine intestinal cell culture model. Toxicol In Vitro 2012; 27:834-43. [PMID: 23274768 DOI: 10.1016/j.tiv.2012.12.019] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 12/14/2012] [Accepted: 12/19/2012] [Indexed: 01/01/2023]
Abstract
Zinc is an essential trace element with a variety of physiological and biochemical functions. Piglets are commonly supplemented, during the weaning period, with doses of zinc above dietary requirements with positive effects on health and performance that might be attributed to anti-secretory and barrier-enhancing effects in the intestine. For a better understanding of these observations increasing zinc sulfate (ZnSO4; 0-200μM) concentrations were used in an in vitro culture model of porcine (IPEC-J2) and human (Caco-2) intestinal epithelial cells and effects on barrier function, viability, and the mRNA expression of one selected heat shock protein (Hsp) were assessed. When treated apically with zinc sulfate, the transepithelial electrical resistance (TEER) did not change significantly. In contrast, cell viability measured by lactate dehydrogenase (LDH) leakage, by ATP and by WST-1 conversion in postconfluent IPEC-J2 monolayers was affected after a 24-h treatment with 200μM ZnSO4. Caco-2 cells were more resistant to Zn. ZnSO4 did not induce any effect on viability, except when it was used at the highest concentration (200μM), and only in preconfluent cells. Furthermore, ZnSO4 induced Hsp70 mRNA expression at 200μM and was more pronounced in preconfluent cells. The observed dose-related effects of zinc are cell-line specific and depended on the differentiation status of the cells. The IPEC-J2 cell line appears to be a suitable in vitro model to characterize specific effects on porcine intestinal cells.
Collapse
Affiliation(s)
- U Lodemann
- Institute of Veterinary Physiology, Department of Veterinary Medicine, Freie Universität Berlin, Oertzenweg 19b, 14163 Berlin, Germany.
| | | | | | | | | |
Collapse
|
35
|
Martens H, de Mendonça Melo M, van den Bosch W, van Genderen PJJ. A 'chigsaw' puzzle after a vacation in Brazil. Neth J Med 2012; 70:321-325. [PMID: 22961826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Affiliation(s)
- H Martens
- Department of Dermatology, Maastricht University Medical Center, Maastricht, The Netherlands
| | | | | | | |
Collapse
|
36
|
Dean C, Dunning FM, Liu H, Bomba-Warczak E, Martens H, Bharat V, Ahmed S, Chapman ER. Axonal and dendritic synaptotagmin isoforms revealed by a pHluorin-syt functional screen. Mol Biol Cell 2012; 23:1715-27. [PMID: 22398727 PMCID: PMC3338438 DOI: 10.1091/mbc.e11-08-0707] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [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] [Indexed: 01/01/2023] Open
Abstract
The synaptotagmins (syts) are a family of molecules that regulate membrane fusion. There are 17 mammalian syt isoforms, most of which are expressed in the brain. However, little is known regarding the subcellular location and function of the majority of these syts in neurons, largely due to a lack of isoform-specific antibodies. Here we generated pHluorin-syt constructs harboring a luminal domain pH sensor, which reports localization, pH of organelles to which syts are targeted, and the kinetics and sites of exocytosis and endocytosis. Of interest, only syt-1 and 2 are targeted to synaptic vesicles, whereas other isoforms selectively recycle in dendrites (syt-3 and 11), axons (syt-5, 7, 10, and 17), or both axons and dendrites (syt-4, 6, 9, and 12), where they undergo exocytosis and endocytosis with distinctive kinetics. Hence most syt isoforms localize to distinct secretory organelles in both axons and dendrites and may regulate neuropeptide/neurotrophin release to modulate neuronal function.
Collapse
Affiliation(s)
- Camin Dean
- Department of Neuroscience, Howard Hughes Medical Institute, University of Wisconsin, Madison, WI 53706, USA
| | | | | | | | | | | | | | | |
Collapse
|
37
|
Antonucci F, Alpár A, Kacza J, Caleo M, Verderio C, Giani A, Martens H, Chaudhry FA, Allegra M, Grosche J, Michalski D, Erck C, Hoffmann A, Harkany T, Matteoli M, Härtig W. Cracking down on inhibition: selective removal of GABAergic interneurons from hippocampal networks. J Neurosci 2012; 32:1989-2001. [PMID: 22323713 PMCID: PMC3742881 DOI: 10.1523/jneurosci.2720-11.2012] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Revised: 12/07/2011] [Accepted: 12/14/2011] [Indexed: 12/12/2022] Open
Abstract
Inhibitory (GABAergic) interneurons entrain assemblies of excitatory principal neurons to orchestrate information processing in the hippocampus. Disrupting the dynamic recruitment as well as the temporally precise activity of interneurons in hippocampal circuitries can manifest in epileptiform seizures, and impact specific behavioral traits. Despite the importance of GABAergic interneurons during information encoding in the brain, experimental tools to selectively manipulate GABAergic neurotransmission are limited. Here, we report the selective elimination of GABAergic interneurons by a ribosome inactivation approach through delivery of saporin-conjugated anti-vesicular GABA transporter antibodies (SAVAs) in vitro as well as in the mouse and rat hippocampus in vivo. We demonstrate the selective loss of GABAergic--but not glutamatergic--synapses, reduced GABA release, and a shift in excitation/inhibition balance in mixed cultures of hippocampal neurons exposed to SAVAs. We also show the focal and indiscriminate loss of calbindin(+), calretinin(+), parvalbumin/system A transporter 1(+), somatostatin(+), vesicular glutamate transporter 3 (VGLUT3)/cholecystokinin/CB(1) cannabinoid receptor(+) and neuropeptide Y(+) local-circuit interneurons upon SAVA microlesions to the CA1 subfield of the rodent hippocampus, with interneuron debris phagocytosed by infiltrating microglia. SAVA microlesions did not affect VGLUT1(+) excitatory afferents. Yet SAVA-induced rearrangement of the hippocampal circuitry triggered network hyperexcitability associated with the progressive loss of CA1 pyramidal cells and the dispersion of dentate granule cells. Overall, our data identify SAVAs as an effective tool to eliminate GABAergic neurons from neuronal circuits underpinning high-order behaviors and cognition, and whose manipulation can recapitulate pathogenic cascades of epilepsy and other neuropsychiatric illnesses.
Collapse
Affiliation(s)
- Flavia Antonucci
- Department of Medical Pharmacology, CNR Institute of Neuroscience, Università di Milano and
- Fondazione Filarete, I-20129 Milan, Italy
| | - Alán Alpár
- Division of Molecular Neurobiology, Department of Medical Biochemistry & Biophysics, Karolinska Institutet, S-17177 Stockholm, Sweden
| | - Johannes Kacza
- Institute of Veterinary Anatomy, University of Leipzig, D-04103 Leipzig, Germany
| | - Matteo Caleo
- CNR Institute of Neuroscience, I-51600 Pisa, Italy
| | - Claudia Verderio
- Department of Medical Pharmacology, CNR Institute of Neuroscience, Università di Milano and
| | - Alice Giani
- Department of Medical Pharmacology, CNR Institute of Neuroscience, Università di Milano and
| | | | - Farrukh A. Chaudhry
- The Biotechnology Centre of Oslo & Centre for Molecular Biology and Neuroscience, University of Oslo, N-0317 Oslo, Norway
| | | | - Jens Grosche
- Paul Flechsig Institute for Brain Research, University of Leipzig, D-04109 Leipzig, Germany
| | - Dominik Michalski
- Department of Neurology, University of Leipzig, D-04103 Leipzig, Germany
| | | | - Anke Hoffmann
- Institute of Veterinary Anatomy, University of Leipzig, D-04103 Leipzig, Germany
| | - Tibor Harkany
- Division of Molecular Neurobiology, Department of Medical Biochemistry & Biophysics, Karolinska Institutet, S-17177 Stockholm, Sweden
- European Neuroscience Institute, University of Aberdeen, Aberdeen AB25 2ZD, United Kingdom, and
| | - Michela Matteoli
- Department of Medical Pharmacology, CNR Institute of Neuroscience, Università di Milano and
- Instituto Clinico Humanitas, IRCCS, Rozzano, I-20089 Milan, Italy
| | - Wolfgang Härtig
- Paul Flechsig Institute for Brain Research, University of Leipzig, D-04109 Leipzig, Germany
| |
Collapse
|
38
|
Yang W, Shen Z, Martens H. An energy-rich diet enhances expression of Na+/H+ exchanger isoform 1 and 3 messenger RNA in rumen epithelium of goat1. J Anim Sci 2012; 90:307-17. [DOI: 10.2527/jas.2011-3854] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- W. Yang
- Laboratory of Animal Physiology and Biochemistry, Nanjing Agricultural University, Nanjing 210095, P. R. China
| | - Z. Shen
- Laboratory of Animal Physiology and Biochemistry, Nanjing Agricultural University, Nanjing 210095, P. R. China
| | - H. Martens
- Institute of Veterinary Physiology, Free University Berlin, D-14163 Berlin, Germany
| |
Collapse
|
39
|
Wirths O, Erck C, Martens H, Harmeier A, Geumann C, Jawhar S, Kumar S, Multhaup G, Walter J, Ingelsson M, Degerman-Gunnarsson M, Kalimo H, Huitinga I, Lannfelt L, Bayer TA. Identification of low molecular weight pyroglutamate A{beta} oligomers in Alzheimer disease: a novel tool for therapy and diagnosis. J Biol Chem 2010; 285:41517-24. [PMID: 20971852 PMCID: PMC3009878 DOI: 10.1074/jbc.m110.178707] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [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: 08/25/2010] [Revised: 10/18/2010] [Indexed: 12/19/2022] Open
Abstract
N-terminally truncated Aβ peptides starting with pyroglutamate (AβpE3) represent a major fraction of all Aβ peptides in the brain of Alzheimer disease (AD) patients. AβpE3 has a higher aggregation propensity and stability and shows increased toxicity compared with full-length Aβ. In the present work, we generated a novel monoclonal antibody (9D5) that selectively recognizes oligomeric assemblies of AβpE3 and studied the potential involvement of oligomeric AβpE3 in vivo using transgenic mouse models as well as human brains from sporadic and familial AD cases. 9D5 showed an unusual staining pattern with almost nondetectable plaques in sporadic AD patients and non-demented controls. Interestingly, in sporadic and familial AD cases prominent intraneuronal and blood vessel staining was observed. Using a novel sandwich ELISA significantly decreased levels of oligomers in plasma samples from patients with AD compared with healthy controls were identified. Moreover, passive immunization of 5XFAD mice with 9D5 significantly reduced overall Aβ plaque load and AβpE3 levels, and normalized behavioral deficits. These data indicate that 9D5 is a therapeutically and diagnostically effective monoclonal antibody targeting low molecular weight AβpE3 oligomers.
Collapse
Affiliation(s)
- Oliver Wirths
- From the Department of Molecular Psychiatry and Alzheimer, Graduate School, University Medicine Goettingen, 37075 Goettingen, Germany
| | | | | | - Anja Harmeier
- the Institute of Chemistry and Biochemistry, Free University of Berlin, 14195 Berlin, Germany
| | | | - Sadim Jawhar
- From the Department of Molecular Psychiatry and Alzheimer, Graduate School, University Medicine Goettingen, 37075 Goettingen, Germany
| | - Sathish Kumar
- the Department of Neurology, Molecular Cell Biology, University of Bonn, 53127 Bonn, Germany
| | - Gerd Multhaup
- the Institute of Chemistry and Biochemistry, Free University of Berlin, 14195 Berlin, Germany
| | - Jochen Walter
- the Department of Neurology, Molecular Cell Biology, University of Bonn, 53127 Bonn, Germany
| | - Martin Ingelsson
- the Department of Public Health and Caring Sciences Rudbeck Laboratory, Uppsala University, SE 75185 Uppsala, Sweden
| | - Malin Degerman-Gunnarsson
- the Department of Public Health and Caring Sciences Rudbeck Laboratory, Uppsala University, SE 75185 Uppsala, Sweden
| | - Hannu Kalimo
- the Department of Pathology, University of Helsinki, FI-00014 Helsingin yliopisto, Finland, and
| | - Inge Huitinga
- the Netherlands Brain Bank, Netherlands Institute for Neuroscience, 1105 BA Amsterdam, Netherlands
| | - Lars Lannfelt
- the Department of Public Health and Caring Sciences Rudbeck Laboratory, Uppsala University, SE 75185 Uppsala, Sweden
| | - Thomas A. Bayer
- From the Department of Molecular Psychiatry and Alzheimer, Graduate School, University Medicine Goettingen, 37075 Goettingen, Germany
| |
Collapse
|
40
|
Todesco R, Gelan J, Martens H, Put J, De Schrijver BC. Photochemistry of non conjugated bichromophoric systems. Photocyclomerization of 1,3 - di(α-naphthyl)propanol. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bscb.19800890705] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
41
|
Berget I, Martens H, Kohler A, Sjurseth S, Afseth N, Narum B, Ådnøy T, Lien S. Caprine CSN1S1 haplotype effect on gene expression and milk composition measured by Fourier transform infrared spectroscopy. J Dairy Sci 2010; 93:4340-50. [DOI: 10.3168/jds.2009-2854] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2009] [Accepted: 05/03/2010] [Indexed: 11/19/2022]
|
42
|
Geumann C, Grønborg M, Hellwig M, Martens H, Jahn R. A sandwich enzyme-linked immunosorbent assay for the quantification of insoluble membrane and scaffold proteins. Anal Biochem 2010; 402:161-9. [DOI: 10.1016/j.ab.2010.03.037] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2010] [Revised: 03/29/2010] [Accepted: 03/30/2010] [Indexed: 10/19/2022]
|
43
|
|
44
|
Harmeyer J, Teinkhao M, Martens H. Modellversuche über die Passage von Aminosäuren durch die Pansenwand in vivo: 1. Mitteilung: Der Aminosäureneinstrom in den entleerten und gewaschenen Pansen. ACTA ACUST UNITED AC 2010. [DOI: 10.1111/j.1439-0442.1974.tb01139.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
45
|
Martens H, Käsebieter H. In-vitro-Untersuchungen über den Einfluß von Natrium- und Kaliumionen auf den Magnesiumtransport durch die isolierte Pansenschleimhaut von Schafen. ACTA ACUST UNITED AC 2010. [DOI: 10.1111/j.1439-0442.1983.tb00674.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
46
|
|
47
|
|
48
|
|
49
|
Kohler A, Böcker U, Warringer J, Blomberg A, Omholt SW, Stark E, Martens H. Reducing inter-replicate variation in fourier transform infrared spectroscopy by extended multiplicative signal correction. Appl Spectrosc 2009; 63:296-305. [PMID: 19281645 DOI: 10.1366/000370209787598906] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Fourier transform infrared (FT-IR) spectroscopy is a powerful tool for characterizing biological tissues and organisms, but it is plagued by replicate variation of various sources. Here, a method for estimating and correcting unwanted replicate variation in multivariate measurement signals, based on extended multiplicative signal correction (EMSC), is presented. Systematic patterns of unwanted methodological variations are estimated from replicate spectra, modeled by a linear subspace model, and implemented into EMSC. The method is applied to FT-IR spectra of two different sets of microorganisms (different double gene knockout strains of Saccharomyces cerevisiae and different species of Listeria) and compared to other preprocessing methods used in FT-IR absorption spectroscopy of microorganisms. The EMSC replicate correction turns out to perform best among the compared methods.
Collapse
Affiliation(s)
- A Kohler
- Nofima Mat, Centre for Biospectroscopy and Data Modelling, Osloveien 1, 1430 As, Norway.
| | | | | | | | | | | | | |
Collapse
|
50
|
Pels K, Schwimmbeck PL, Rosenthal P, Loddenkemper C, Dang-Heine C, Rauch U, Martens H, Schultheiss HP, Dechend R, Deiner C. Long-term clopidogrel administration following severe coronary injury reduces proliferation and inflammation via inhibition of nuclear factor-kappaB and activator protein 1 activation in pigs. Eur J Clin Invest 2009; 39:174-82. [PMID: 19260946 DOI: 10.1111/j.1365-2362.2009.02089.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND The optimal duration of clopidogrel treatment following percutaneous coronary intervention (PCI) and the patient population that would benefit most are still unknown. In a porcine coronary injury model, we tested two different durations of clopidogrel treatment on severely or moderately injured arteries and examined the arterial response to injury. To understand the molecular mechanism, we also investigated the effects on transcription factors nuclear factor-kappaB (NF-kappaB) and activator protein 1 (AP-1). MATERIALS AND METHODS In 24 cross-bred pigs, one coronary artery was only moderately injured by percutaneous transluminal coronary angioplasty (PTCA) and one coronary artery was severely injured by PTCA and subsequent beta-irradiation (Brachy group). Animals received 325 mg aspirin daily for 3 months and 75 mg clopidogrel daily for either 28 days [short-term (ST) clopidogrel group] or 3 months [long-term (LT) clopidogrel group]. RESULTS After 3 months, the number of proliferating cells per cross-section differed significantly between ST and LT in both injury groups (PTCA(ST) 90.2 +/- 10.3 vs. PTCA(LT )19.2 +/- 4.7, P < 0.05; Brachy(ST) 35.8 +/- 8.4 vs. Brachy(LT) 7.5 +/- 2.0, P < 0.05). Similar results were seen for inflammatory cells (CD3(+) cells): PTCA(ST) 23.5 +/- 3.55 vs. PTCA(LT )4.67 +/- 0.92, P < 0.05; Brachy(ST) 83.17 +/- 11.17 vs. Brachy(LT) 20 +/- 4.82, P < 0.05). Long-term administration also reduced the activity of NF-kappaB and AP-1 by 62-64% and 42-58%, respectively. However, the effects of different durations of clopidogrel administration on artery dimensions were not statistically significant. CONCLUSIONS Regarding inflammation and transcription factor activity at the PCI site, long-term clopidogrel administration is superior to short-term administration, especially in severely injured arteries. Transferring our results to the human situation, patients with more severely diseased arteries may benefit from a prolonged clopidogrel medication after PCI.
Collapse
Affiliation(s)
- K Pels
- Charité- Campus Benjamin Franklin, Berlin, Germany.
| | | | | | | | | | | | | | | | | | | |
Collapse
|