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Langnaese K, Tiwari N, Fischer KD, Thomas U, Korthals M. Neuroplastin splice variants Np55 and Np65: Who is doing the job in macrophages? Mol Immunol 2024; 170:57-59. [PMID: 38615628 DOI: 10.1016/j.molimm.2024.03.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 03/16/2024] [Indexed: 04/16/2024]
Abstract
Neuroplastin, a paralog of CD147/Basigin, is known as a neuronal cell adhesion molecule and as an auxiliary subunit of plasma membrane calcium ATPases in both neurons and adaptive immune cells. Recently, an interesting study by Ren et al. (2022) provided evidence for an important role of neuroplastin in macrophages during bacterial infection. Here, we critically discuss one aspect of this study, the assignment of this role to Np65 as one of two prominent splice variants of neuroplastin.
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Affiliation(s)
- Kristina Langnaese
- Institute for Biochemistry and Cell Biology, Otto-von-Guericke University, Medical Faculty, Magdeburg, Germany
| | - Nikhil Tiwari
- Institute for Biochemistry and Cell Biology, Otto-von-Guericke University, Medical Faculty, Magdeburg, Germany; Department of Cellular Neuroscience, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Klaus-Dieter Fischer
- Institute for Biochemistry and Cell Biology, Otto-von-Guericke University, Medical Faculty, Magdeburg, Germany
| | - Ulrich Thomas
- Department of Cellular Neuroscience, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Mark Korthals
- Institute for Biochemistry and Cell Biology, Otto-von-Guericke University, Medical Faculty, Magdeburg, Germany.
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2
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Bertin F, Jara-Wilde J, Auer B, Köhler-Solís A, González-Silva C, Thomas U, Sierralta J. Drosophila Atlastin regulates synaptic vesicle mobilization independent of bone morphogenetic protein signaling. Biol Res 2023; 56:49. [PMID: 37710314 PMCID: PMC10503011 DOI: 10.1186/s40659-023-00462-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 09/01/2023] [Indexed: 09/16/2023] Open
Abstract
BACKGROUND The endoplasmic reticulum (ER) contacts endosomes in all parts of a motor neuron, including the axon and presynaptic terminal, to move structural proteins, proteins that send signals, and lipids over long distances. Atlastin (Atl), a large GTPase, is required for membrane fusion and the structural dynamics of the ER tubules. Atl mutations are the second most common cause of Hereditary Spastic Paraplegia (HSP), which causes spasticity in both sexes' lower extremities. Through an unknown mechanism, Atl mutations stimulate the BMP (bone morphogenetic protein) pathway in vertebrates and Drosophila. Synaptic defects are caused by atl mutations, which affect the abundance and distribution of synaptic vesicles (SV) in the bouton. We hypothesize that BMP signaling, does not cause Atl-dependent SV abnormalities in Drosophila. RESULTS We show that atl knockdown in motor neurons (Atl-KD) increases synaptic and satellite boutons in the same way that constitutively activating the BMP-receptor Tkv (thick veins) (Tkv-CA) increases the bouton number. The SV proteins Cysteine string protein (CSP) and glutamate vesicular transporter are reduced in Atl-KD and Tkv-CA larvae. Reducing the activity of the BMP receptor Wishful thinking (wit) can rescue both phenotypes. Unlike Tkv-CA larvae, Atl-KD larvae display altered activity-dependent distributions of CSP staining. Furthermore, Atl-KD larvae display an increased FM 1-43 unload than Control and Tkv-CA larvae. As decreasing wit function does not reduce the phenotype, our hypothesis that BMP signaling is not involved is supported. We also found that Rab11/CSP colocalization increased in Atl-KD larvae, which supports the concept that late recycling endosomes regulate SV movements. CONCLUSIONS Our findings reveal that Atl modulates neurotransmitter release in motor neurons via SV distribution independently of BMP signaling, which could explain the observed SV accumulation and synaptic dysfunction. Our data suggest that Atl is involved in membrane traffic as well as formation and/or recycling of the late endosome.
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Affiliation(s)
- Francisca Bertin
- Biomedical Neuroscience Institute (BNI), Santiago, Chile
- Department of Neuroscience, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Jorge Jara-Wilde
- SCIAN-Lab, Biomedical Neuroscience Institute (BNI), Santiago, Chile
- Department of Computational Sciences, Faculty of Physical and Mathematical Sciences, Universidad de Chile, Santiago, Chile
| | - Benedikt Auer
- Laboratory of Neuronal and Synaptic Signals, Department of Cellular Neuroscience, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Andrés Köhler-Solís
- Biomedical Neuroscience Institute (BNI), Santiago, Chile
- Department of Neuroscience, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Carolina González-Silva
- Biomedical Neuroscience Institute (BNI), Santiago, Chile
- Department of Neuroscience, Faculty of Medicine, Universidad de Chile, Santiago, Chile
| | - Ulrich Thomas
- Functional Genetics of the Synapse, Department of Cellular Neuroscience, Leibniz Institute for Neurobiology, 39118, Magdeburg, Germany
| | - Jimena Sierralta
- Biomedical Neuroscience Institute (BNI), Santiago, Chile.
- Department of Neuroscience, Faculty of Medicine, Universidad de Chile, Santiago, Chile.
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Ghelani T, Escher M, Thomas U, Esch K, Lützkendorf J, Depner H, Maglione M, Parutto P, Gratz S, Matkovic-Rachid T, Ryglewski S, Walter AM, Holcman D, O‘Connor Giles K, Heine M, Sigrist SJ. Interactive nanocluster compaction of the ELKS scaffold and Cacophony Ca 2+ channels drives sustained active zone potentiation. Sci Adv 2023; 9:eade7804. [PMID: 36800417 PMCID: PMC9937578 DOI: 10.1126/sciadv.ade7804] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Accepted: 01/17/2023] [Indexed: 06/01/2023]
Abstract
At presynaptic active zones (AZs), conserved scaffold protein architectures control synaptic vesicle (SV) release by defining the nanoscale distribution and density of voltage-gated Ca2+ channels (VGCCs). While AZs can potentiate SV release in the minutes range, we lack an understanding of how AZ scaffold components and VGCCs engage into potentiation. We here establish dynamic, intravital single-molecule imaging of endogenously tagged proteins at Drosophila AZs undergoing presynaptic homeostatic potentiation. During potentiation, the numbers of α1 VGCC subunit Cacophony (Cac) increased per AZ, while their mobility decreased and nanoscale distribution compacted. These dynamic Cac changes depended on the interaction between Cac channel's intracellular carboxyl terminus and the membrane-close amino-terminal region of the ELKS-family protein Bruchpilot, whose distribution compacted drastically. The Cac-ELKS/Bruchpilot interaction was also needed for sustained AZ potentiation. Our single-molecule analysis illustrates how the AZ scaffold couples to VGCC nanoscale distribution and dynamics to establish a state of sustained potentiation.
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Affiliation(s)
- Tina Ghelani
- Institute for Biology and Genetics, Freie Universität Berlin, Takustraße 6, 14195 Berlin, Germany
- Molecular and Theoretical Neuroscience Leibniz-Forschungs Institut für Molekulare Pharmakologie (FMP) im CharitéCrossOver (CCO) Charité–University Medicine Berlin Charité Campus Mitte, Charité Platz, 110117 Berlin, Germany
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, Charitéplatz 1, 10117 Berlin, Germany
| | - Marc Escher
- Institute for Biology and Genetics, Freie Universität Berlin, Takustraße 6, 14195 Berlin, Germany
| | - Ulrich Thomas
- Department of Cellular Neurobiology, Leibniz Institute for Neurobiology, Brenneckestr. 6, 39118 Magdeburg, Germany
| | - Klara Esch
- Institute for Biology and Genetics, Freie Universität Berlin, Takustraße 6, 14195 Berlin, Germany
| | - Janine Lützkendorf
- Institute for Biology and Genetics, Freie Universität Berlin, Takustraße 6, 14195 Berlin, Germany
| | - Harald Depner
- Institute for Biology and Genetics, Freie Universität Berlin, Takustraße 6, 14195 Berlin, Germany
| | - Marta Maglione
- Institute for Biology and Genetics, Freie Universität Berlin, Takustraße 6, 14195 Berlin, Germany
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, Charitéplatz 1, 10117 Berlin, Germany
- Institute for Chemistry and Biochemistry, SupraFAB, Freie Universität Berlin, Altensteinstr. 23a, 14195 Berlin, Germany
| | - Pierre Parutto
- Group of Applied Mathematics and Computational Biology, IBENS, Ecole Normale Superieure, Paris, France
- Dementia Research Institute at University of Cambridge, Department of Clinical Neurosciences, Cambridge CB2 0AH, UK
- Churchill College, University of Cambridge, Cambridge CB3 0DS, UK
| | - Scott Gratz
- Department of Neuroscience, Brown University, Providence, RI 02912, USA
| | - Tanja Matkovic-Rachid
- Institute for Biology and Genetics, Freie Universität Berlin, Takustraße 6, 14195 Berlin, Germany
| | - Stefanie Ryglewski
- Institute of Developmental Biology and Neurobiology, Johannes Gutenberg University Mainz, Mainz, Germany
| | - Alexander M. Walter
- Molecular and Theoretical Neuroscience Leibniz-Forschungs Institut für Molekulare Pharmakologie (FMP) im CharitéCrossOver (CCO) Charité–University Medicine Berlin Charité Campus Mitte, Charité Platz, 110117 Berlin, Germany
- Department of Neuroscience, University of Copenhagen, Copenhagen 2200, Denmark
| | - David Holcman
- Group of Applied Mathematics and Computational Biology, IBENS, Ecole Normale Superieure, Paris, France
- Churchill College, University of Cambridge, Cambridge CB3 0DS, UK
| | - Kate O‘Connor Giles
- Department of Neuroscience, Brown University, Providence, RI 02912, USA
- Carney Institute for Brain Science, Brown University, Providence, RI 02912, USA
| | - Martin Heine
- Institute of Developmental Biology and Neurobiology, Johannes Gutenberg University Mainz, Mainz, Germany
- Research Group Molecular Physiology, Leibniz Institute for Neurobiology, Brenneckestr. 6, 39118 Magdeburg, Germany
| | - Stephan J. Sigrist
- Institute for Biology and Genetics, Freie Universität Berlin, Takustraße 6, 14195 Berlin, Germany
- NeuroCure Cluster of Excellence, Charité Universitätsmedizin, Charitéplatz 1, 10117 Berlin, Germany
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Beckmann D, Langnaese K, Gottfried A, Hradsky J, Tedford K, Tiwari N, Thomas U, Fischer KD, Korthals M. Ca 2+ Homeostasis by Plasma Membrane Ca 2+ ATPase (PMCA) 1 Is Essential for the Development of DP Thymocytes. Int J Mol Sci 2023; 24:ijms24021442. [PMID: 36674959 PMCID: PMC9865543 DOI: 10.3390/ijms24021442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/22/2022] [Accepted: 12/30/2022] [Indexed: 01/13/2023] Open
Abstract
The strength of Ca2+ signaling is a hallmark of T cell activation, yet the role of Ca2+ homeostasis in developing T cells before expressing a mature T cell receptor is poorly understood. We aimed to unveil specific functions of the two plasma membrane Ca2+ ATPases expressed in T cells, PMCA1 and PMCA4. On a transcriptional and protein level we found that PMCA4 was expressed at low levels in CD4-CD8- double negative (DN) thymocytes and was even downregulated in subsequent stages while PMCA1 was present throughout development and upregulated in CD4+CD8+ double positive (DP) thymocytes. Mice with a targeted deletion of Pmca1 in DN3 thymocytes had an almost complete block of DP thymocyte development with an accumulation of DN4 thymocytes but severely reduced numbers of CD8+ immature single positive (ISP) thymocytes. The DN4 thymocytes of these mice showed strongly elevated basal cytosolic Ca2+ levels and a pre-mature CD5 expression, but in contrast to the DP thymocytes they were only mildly prone to apoptosis. Surprisingly, mice with a germline deletion of Pmca4 did not show any signs of altered progression through the developmental thymocyte stages, nor altered Ca2+ homeostasis throughout this process. PMCA1 is, therefore, non-redundant in keeping cellular Ca2+ levels low in the early thymocyte development required for the DN to DP transition.
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Affiliation(s)
- David Beckmann
- Institute for Biochemistry and Cell Biology, Medical Faculty, Otto-von-Guericke-University Magdeburg, 39120 Magdeburg, Germany
| | - Kristina Langnaese
- Institute for Biochemistry and Cell Biology, Medical Faculty, Otto-von-Guericke-University Magdeburg, 39120 Magdeburg, Germany
| | - Anna Gottfried
- Institute for Biochemistry and Cell Biology, Medical Faculty, Otto-von-Guericke-University Magdeburg, 39120 Magdeburg, Germany
| | - Johannes Hradsky
- Institute for Biochemistry and Cell Biology, Medical Faculty, Otto-von-Guericke-University Magdeburg, 39120 Magdeburg, Germany
| | - Kerry Tedford
- Institute for Biochemistry and Cell Biology, Medical Faculty, Otto-von-Guericke-University Magdeburg, 39120 Magdeburg, Germany
| | - Nikhil Tiwari
- Department of Cellular Neuroscience, Leibniz Institute for Neurobiology, 39120 Magdeburg, Germany
| | - Ulrich Thomas
- Department of Cellular Neuroscience, Leibniz Institute for Neurobiology, 39120 Magdeburg, Germany
| | - Klaus-Dieter Fischer
- Institute for Biochemistry and Cell Biology, Medical Faculty, Otto-von-Guericke-University Magdeburg, 39120 Magdeburg, Germany
- Correspondence:
| | - Mark Korthals
- Institute for Biochemistry and Cell Biology, Medical Faculty, Otto-von-Guericke-University Magdeburg, 39120 Magdeburg, Germany
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Lickiss B, Gossmann M, Linder P, Thomas U, Dragicevic E, Lemme M, George M, Fertig N, Stölzle-Feix S. Hybrid Cell Analysis System to Assess Structural and Contractile Changes of Human iPSC-Derived Cardiomyocytes for Preclinical Cardiac Risk Evaluation. J Vis Exp 2022. [DOI: 10.3791/64283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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6
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Gossmann M, Lickiss B, Lemme M, Dragicevic E, Vaidyanathan R, Linder P, Thomas U, Stoelzle-Feix S, George M, Okeyo GO, Knox R, Haedo R, Fertig N. Tackling chronic compound responses of hiPSC-CMs for preclinical cardiac risk evaluation: defined serum-free medium and long-term culture on the FLEXcyte 96. Biophys J 2022. [DOI: 10.1016/j.bpj.2021.11.1568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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7
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Stoelzle-Feix S, Juhasz K, Skiba M, Wegener J, Knox R, Lemme M, Thomas U, Engelstaedter M, Dragicevic E, George M, Fertig N. Cell monitoring using multi-frequency impedance recordings for label-free and time-resolved cell response analysis. J Pharmacol Toxicol Methods 2021. [DOI: 10.1016/j.vascn.2021.106969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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8
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Lemme M, Linder P, Thomas U, Dragicevic E, George M, Fertig N, Gossmann M, Stoelzle-Feix S. Mechanical stimulation in a 2D high-throughput contractility system induces functional changes in human induced pluripotent stem cell-derived cardiomyocytes. J Pharmacol Toxicol Methods 2021. [DOI: 10.1016/j.vascn.2021.107022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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9
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Dragicevic E, Juhasz K, Reinhardt O, Thomas U, Johannssen T, Nörenberg A, Ziller M, Fertig N, Alves F, Stölzle-Feix S. High-content multi-frequency impedance cell monitoring for label-free and time-resolved cell toxicity analysis of various cell types. Toxicol Lett 2021. [DOI: 10.1016/s0378-4274(21)00483-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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10
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Kobler O, Weiglein A, Hartung K, Chen YC, Gerber B, Thomas U. A quick and versatile protocol for the 3D visualization of transgene expression across the whole body of larval Drosophila. J Neurogenet 2021; 35:306-319. [PMID: 33688796 DOI: 10.1080/01677063.2021.1892096] [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] [Indexed: 10/21/2022]
Abstract
Larval Drosophila are used as a genetically accessible study case in many areas of biological research. Here we report a fast, robust and user-friendly procedure for the whole-body multi-fluorescence imaging of Drosophila larvae; the protocol has been optimized specifically for larvae by systematically tackling the pitfalls associated with clearing this small but cuticularized organism. Tests on various fluorescent proteins reveal that the recently introduced monomeric infrared fluorescent protein (mIFP) is particularly suitable for our approach. This approach comprises an effective, low-cost clearing protocol with minimal handling time and reduced toxicity in the reagents employed. It combines a success rate high enough to allow for small-scale screening approaches and a resolution sufficient for cellular-level analyses with light sheet and confocal microscopy. Given that publications and database documentations typically specify expression patterns of transgenic driver lines only within a given organ system of interest, the present procedure should be versatile enough to extend such documentation systematically to the whole body. As examples, the expression patterns of transgenic driver lines covering the majority of neurons, or subsets of chemosensory, central brain or motor neurons, are documented in the context of whole larval body volumes (using nsyb-Gal4, IR76b-Gal4, APL-Gal4 and mushroom body Kenyon cells, or OK371-Gal4, respectively). Notably, the presented protocol allows for triple-color fluorescence imaging with near-infrared, red and yellow fluorescent proteins.
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Affiliation(s)
- Oliver Kobler
- Leibniz Institute for Neurobiology, Combinatorial NeuroImaging Core Facility (CNI), Magdeburg, Germany
| | - Aliće Weiglein
- Department of Genetics of Learning and Memory, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Kathrin Hartung
- Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Yi-Chun Chen
- Department of Genetics of Learning and Memory, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Bertram Gerber
- Department of Genetics of Learning and Memory, Leibniz Institute for Neurobiology, Magdeburg, Germany.,Institute of Biology, Otto von Guericke University, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Otto von Guericke University, Magdeburg, Germany
| | - Ulrich Thomas
- Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany.,Department of Cellular Neuroscience, Leibniz Institute for Neurobiology, Magdeburg, Germany
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11
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Korthals M, Tech L, Langnaese K, Gottfried A, Hradsky J, Thomas U, Zenclussen AC, Brunner-Weinzierl MC, Tedford K, Fischer KD. Plasma membrane Ca 2+ ATPase 1 (PMCA1) but not PMCA4 is critical for B-cell development and Ca 2+ homeostasis in mice. Eur J Immunol 2020; 51:594-602. [PMID: 33098669 DOI: 10.1002/eji.202048654] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 08/29/2020] [Accepted: 10/22/2020] [Indexed: 12/13/2022]
Abstract
The amplitude and duration of Ca2+ signaling is crucial for B-cell development and self-tolerance; however, the mechanisms for terminating Ca2+ signals in B cells have not been determined. In lymphocytes, plasma membrane Ca2+ ATPase (PMCA) isoforms 1 and 4 (PMCA1 and PMCA4, aka ATP2B1 and ATP2B4) are the main candidates for expelling Ca2+ from the cell through the plasma membrane. We report here that Pmca4 (Atp2b4) KO mice had normal B-cell development, while mice with a conditional KO of Pmca1 (Atp2b1) had greatly reduced numbers of B cells, particularly splenic follicular B cells, marginal zone B cells, and peritoneal B-1a cells. Mouse and naïve human B cells showed only PMCA1 expression and no PMCA4 by western blot, in contrast to T cells, which did express PMCA4. Calcium handling was normal in Pmca4-/- B cells, but Pmca1 KO B cells had elevated basal levels of Ca2+ , elevated levels in ER stores, and reduced Ca2+ clearance. These findings show that the PMCA1 isoform alone is required to ensure normal B-cell Ca2+ signaling and development, which may have implications for therapeutic targeting of PMCAs and Ca2+ in B cells.
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Affiliation(s)
- Mark Korthals
- Institute for Biochemistry and Cell Biology, Otto-von-Guericke University, Magdeburg, Germany
| | - Laura Tech
- Institute for Biochemistry and Cell Biology, Otto-von-Guericke University, Magdeburg, Germany
| | - Kristina Langnaese
- Institute for Biochemistry and Cell Biology, Otto-von-Guericke University, Magdeburg, Germany
| | - Anna Gottfried
- Institute for Biochemistry and Cell Biology, Otto-von-Guericke University, Magdeburg, Germany
| | - Johannes Hradsky
- Institute for Biochemistry and Cell Biology, Otto-von-Guericke University, Magdeburg, Germany
| | - Ulrich Thomas
- Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Ana Claudia Zenclussen
- Experimental Obstetrics and Gynecology, Otto-von-Guericke University, Magdeburg, Germany
| | | | - Kerry Tedford
- Institute for Biochemistry and Cell Biology, Otto-von-Guericke University, Magdeburg, Germany
| | - Klaus-Dieter Fischer
- Institute for Biochemistry and Cell Biology, Otto-von-Guericke University, Magdeburg, Germany
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12
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Meltendorf S, Fu H, Pierau M, Lindquist JA, Finzel S, Mertens PR, Gieseler-Halbach S, Ambach A, Thomas U, Lingel H, Voll RE, Brunner-Weinzierl MC. Cell Survival Failure in Effector T Cells From Patients With Systemic Lupus Erythematosus Following Insufficient Up-Regulation of Cold-Shock Y-Box Binding Protein 1. Arthritis Rheumatol 2020; 72:1721-1733. [PMID: 32475063 DOI: 10.1002/art.41382] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Accepted: 04/23/2020] [Indexed: 12/11/2022]
Abstract
OBJECTIVE The importance of cold-shock Y-box binding protein 1 (YB-1) for cell homeostasis is well-documented based on prior observations of its association with certain cancer entities. This study was undertaken to explore the role of YB-1 in T cell homeostasis and survival and the potential contribution of YB-1 to the pathogenesis of systemic lupus erythematosus (SLE). METHODS In the peripheral blood from 25 SLE patients and 25 healthy donors, the expression of YB-1 and frequency of T cell apoptosis was analyzed by quantitative polymerase chain reaction (qPCR) and fluorescence-activated cell sorting of CD4+ T cells ex vivo and also analyzed in T cells in vitro after 6 days of stimulation with anti-CD3-coupled or anti-CD3/anti-CD28-coupled microspheres. YB-1 was overexpressed using lentiviral transduction with wild-type green fluorescent protein (wtGFP) YB-1, and knockdown of YB-1 was achieved using specific short hairpin RNA (shRNA) (3-fold reduction; P < 0.0001). RESULTS YB-1 expression was significantly lower in apoptosis-prone T cells and in activated T cells from SLE patients compared to YB-1 expression in nonapoptotic T cells and activated T cells from healthy donors (P = 0.001). Knockdown of YB-1 in T cells consequently led to expression of proapoptotic molecules and caspase 3 activation (1.6-fold), and subsequently, to apoptosis. Furthermore, YB-1 promoted survival pathways involving enhanced protein expression of the kinase Akt (2-fold) and Bcl-2 (3-fold), even when Fas/CD95 was triggered. YB-1-mediated T cell survival was reversed by Akt and phosphatidylinositol 3-kinase (PI3K) inactivation. In SLE patients, rescue of YB-1 expression strongly promoted survival of T cells and even prevented cell death in T cells that were extremely apoptosis-prone. CONCLUSION Our data show that failure of YB-1 up-regulation in T cells from SLE patients led to enhanced apoptosis. These findings imply that YB-1 plays a crucial role in the disturbed homeostasis of activated T cells leading to hematopoietic alterations in SLE. These insights may help facilitate the development of new treatment strategies for SLE.
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Affiliation(s)
- Stefan Meltendorf
- Department of Experimental Pediatrics, Otto von uericke University, Magdeburg, Germany
| | - Hang Fu
- Department of Experimental Pediatrics, Otto von uericke University, Magdeburg, Germany
| | - Mandy Pierau
- Department of Experimental Pediatrics, Otto von uericke University, Magdeburg, Germany
| | - Jonathan A Lindquist
- Clinic of Nephrology, Hypertension, Diabetes, and Endocrinology, Otto von Guericke University, Magdeburg, Germany
| | - Stephanie Finzel
- Department of Rheumatology and Clinical Immunology, Albert Ludwig University of Freiburg, Freiburg, Germany
| | - Peter R Mertens
- Clinic of Nephrology, Hypertension, Diabetes, and Endocrinology, Otto von Guericke University, Magdeburg, Germany
| | | | - Andreas Ambach
- Department of Dermatology, Otto von Guericke University, Magdeburg, Germany
| | - Ulrich Thomas
- Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Holger Lingel
- Department of Experimental Pediatrics, Otto von uericke University, Magdeburg, Germany
| | - Reinhard E Voll
- Department of Rheumatology and Clinical Immunology, Albert Ludwig University of Freiburg, Freiburg, Germany
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13
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Goßmann M, Linder P, Thomas U, Juhasz K, Lemme M, George M, Fertig N, Dragicevic E, Stoelzle-Feix S. Integration of mechanical conditioning into a high throughput contractility assay for cardiac safety assessment. J Pharmacol Toxicol Methods 2020; 105:106892. [PMID: 32629160 DOI: 10.1016/j.vascn.2020.106892] [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: 02/28/2020] [Revised: 05/29/2020] [Accepted: 06/18/2020] [Indexed: 01/10/2023]
Abstract
INDUCTION Despite increasing acceptance of human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) in safety pharmacology, controversy remains about the physiological relevance of existing in vitro models for their mechanical testing. We hypothesize that existing signs of immaturity of the cell models result from an improper mechanical environment. With the presented study, we aimed at validating the newly developed FLEXcyte96 technology with respect to physiological responses of hiPSC-CMs to pharmacological compounds with known inotropic and/or cardiotoxic effects. METHODS hiPSC-CMs were cultured in a 96-well format on hyperelastic silicone membranes imitating their native mechanical environment. Cardiomyocyte contractility was measured contact-free by application of capacitive displacement sensing of the cell-membrane biohybrids. Acute effects of positive inotropic compounds with distinct mechanisms of action were examined. Additionally, cardiotoxic effects of tyrosine kinase inhibitors and anthracyclines were repetitively examined during repeated exposure to drug concentrations for up to 5 days. RESULTS hiPSC-CMs grown on biomimetic membranes displayed increased contractility responses to isoproterenol, S-Bay K8644 and omecamtiv mecarbil without the need for additional stimulation. Tyrosine kinase inhibitor erlotinib, vandetanib, nilotinib, gefitinib, A-674563 as well as anthracycline idarubicin showed the expected cardiotoxic effects, including negative inotropy and induction of proarrhythmic events. DISCUSSION We conclude that the FLEXcyte 96 system is a reliable high throughput tool for invitro cardiac contractility research, providing the user with data obtained under physiological conditions which resemble the native environment of human heart tissue. We showed that the results obtained for both acute and sub-chronic compound administration are consistent with the respective physiological responses in humans.
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Affiliation(s)
| | - Peter Linder
- innoVitro GmbH, Artilleriestr 2, 52428 Jülich, Germany
| | - Ulrich Thomas
- Nanion Technologies GmbH, Ganghoferstr 70A, 80339 Munich, Germany
| | - Krisztina Juhasz
- Nanion Technologies GmbH, Ganghoferstr 70A, 80339 Munich, Germany; Institute for Nanoelectronics, Technische Universität München, Arcisstrasse 21, 80333 Munich, Germany
| | - Marta Lemme
- Nanion Technologies GmbH, Ganghoferstr 70A, 80339 Munich, Germany
| | - Michael George
- Nanion Technologies GmbH, Ganghoferstr 70A, 80339 Munich, Germany
| | - Niels Fertig
- Nanion Technologies GmbH, Ganghoferstr 70A, 80339 Munich, Germany
| | - Elena Dragicevic
- Nanion Technologies GmbH, Ganghoferstr 70A, 80339 Munich, Germany
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14
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Knox R, Bruggemann A, Gossmann M, Thomas U, Horváth A, Dragicevic E, Stoelzle-Feix S, Fertig N, Jung A, Raman AH, Staat M, Linder P. Combining Physiological Relevance and Throughput for in vitro Cardiac Contractility Measurement. Biophys J 2020. [DOI: 10.1016/j.bpj.2019.11.3104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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15
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Schattling B, Engler JB, Volkmann C, Rothammer N, Woo MS, Petersen M, Winkler I, Kaufmann M, Rosenkranz SC, Fejtova A, Thomas U, Bose A, Bauer S, Träger S, Miller KK, Brück W, Duncan KE, Salinas G, Soba P, Gundelfinger ED, Merkler D, Friese MA. Bassoon proteinopathy drives neurodegeneration in multiple sclerosis. Nat Neurosci 2019; 22:887-896. [PMID: 31011226 DOI: 10.1038/s41593-019-0385-4] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 03/13/2019] [Indexed: 12/21/2022]
Abstract
Multiple sclerosis (MS) is characterized by inflammatory insults that drive neuroaxonal injury. However, knowledge about neuron-intrinsic responses to inflammation is limited. By leveraging neuron-specific messenger RNA profiling, we found that neuroinflammation leads to induction and toxic accumulation of the synaptic protein bassoon (Bsn) in the neuronal somata of mice and patients with MS. Neuronal overexpression of Bsn in flies resulted in reduction of lifespan, while genetic disruption of Bsn protected mice from inflammation-induced neuroaxonal injury. Notably, pharmacological proteasome activation boosted the clearance of accumulated Bsn and enhanced neuronal survival. Our study demonstrates that neuroinflammation initiates toxic protein accumulation in neuronal somata and advocates proteasome activation as a potential remedy.
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Affiliation(s)
- Benjamin Schattling
- Institut für Neuroimmunologie und Multiple Sklerose, Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Jan Broder Engler
- Institut für Neuroimmunologie und Multiple Sklerose, Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Constantin Volkmann
- Institut für Neuroimmunologie und Multiple Sklerose, Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Nicola Rothammer
- Institut für Neuroimmunologie und Multiple Sklerose, Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Marcel S Woo
- Institut für Neuroimmunologie und Multiple Sklerose, Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Meike Petersen
- Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Iris Winkler
- Institut für Neuroimmunologie und Multiple Sklerose, Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Max Kaufmann
- Institut für Neuroimmunologie und Multiple Sklerose, Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Sina C Rosenkranz
- Institut für Neuroimmunologie und Multiple Sklerose, Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Anna Fejtova
- Leibniz-Institute für Neurobiologie, Magdeburg, Germany.,Psychiatrische und Psychotherapeutische Klinik, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Ulrich Thomas
- Leibniz-Institute für Neurobiologie, Magdeburg, Germany
| | - Aparajita Bose
- Institut für Neuroimmunologie und Multiple Sklerose, Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Simone Bauer
- Institut für Neuroimmunologie und Multiple Sklerose, Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Simone Träger
- Institut für Neuroimmunologie und Multiple Sklerose, Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Katharine K Miller
- Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Wolfgang Brück
- Institut für Neuropathologie, Universitätsmedizin Göttingen, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Kent E Duncan
- Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Gabriela Salinas
- Transkriptomanalyselabor, Institut für Entwicklungsbiochemie, Universitätsmedizin Göttingen, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Peter Soba
- Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Eckart D Gundelfinger
- Leibniz-Institute für Neurobiologie, Magdeburg, Germany.,Center for Behavioral Brain Sciences and Medical Faculty, Otto von Guericke Universität, Magdeburg, Germany
| | - Doron Merkler
- Department of Pathology and Immunology, Service of Clinical Pathology, Geneva Faculty of Medicine, Geneva, Switzerland
| | - Manuel A Friese
- Institut für Neuroimmunologie und Multiple Sklerose, Zentrum für Molekulare Neurobiologie Hamburg, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany.
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16
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Barthmes M, Juhasz K, Bazzone A, Thomas U, Stoelzle-Feix S, Bruggemann A, George M, Fertig N. Na+/Ca2+ Exchanger in Human iPSC Derived Cardiomyocytes: Functional Evidence and Relevance for Beating Behavior. Biophys J 2019. [DOI: 10.1016/j.bpj.2018.11.2980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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17
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Marter K, Kobler O, Erdmann I, Soleimanpour E, Landgraf P, Müller A, Abele J, Thomas U, Dieterich DC. Click Chemistry (CuAAC) and Detection of Tagged de novo Synthesized Proteins in Drosophila. Bio Protoc 2019; 9:e3142. [PMID: 33654887 PMCID: PMC7854109 DOI: 10.21769/bioprotoc.3142] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 12/12/2018] [Accepted: 12/17/2018] [Indexed: 11/02/2022] Open
Abstract
Copper-catalyzed azide-alkyne-cycloaddition (CuAAC), also known as 'click chemistry' serves as a technique for bio-orthogonal, that is, bio-compatible labeling of macromolecules including proteins or lipids. Click chemistry has been widely used to covalently, selectively, and efficiently attach probes such as fluorophores or biotin to small bio-orthogonal chemical reporter groups introduced into macromolecules. In bio-orthogonal non-canonical amino acid tagging (BONCAT) and fluorescent non-canonical amino acid tagging (FUNCAT) proteins are metabolically labeled with a non-canonical, azide-bearing amino acid and subsequently CuAAC-clicked either to an alkyne-bearing biotin (BONCAT) for protein purification, Western blot, or mass spectrometry analyses or to an alkyne-bearing fluorophore (FUNCAT) for immunohistochemistry. In combination with mass spectrometry, these kinds of labeling and tagging strategies are a suitable option to identify and characterize specific proteomes in living organisms without the need of prior cell sorting. Here, we provide detailed protocols for FUNCAT and BONCAT click chemistry and the detection of tagged de novo synthesized proteins in Drosophila melanogaster.
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Affiliation(s)
- Kathrin Marter
- Neuronal Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
- Research Group Neuralomics, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Oliver Kobler
- Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Ines Erdmann
- Neuronal Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
- Research Group Neuralomics, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Elaheh Soleimanpour
- Neuronal Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
| | - Peter Landgraf
- Neuronal Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
- Research Group Neuralomics, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Anke Müller
- Neuronal Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
- Research Group Neuralomics, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Julia Abele
- Neuronal Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
- Research Group Neuralomics, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Ulrich Thomas
- Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Daniela C. Dieterich
- Neuronal Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University Magdeburg, Magdeburg, Germany
- Research Group Neuralomics, Leibniz Institute for Neurobiology, Magdeburg, Germany
- Center for Behavioral Brain Sciences, Magdeburg, Germany
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18
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Ferrea E, Suriya-Arunroj L, Hoehl D, Thomas U, Gail A. Implantable computer-controlled adaptive multielectrode positioning system. J Neurophysiol 2018; 119:1471-1484. [DOI: 10.1152/jn.00504.2017] [Citation(s) in RCA: 3] [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] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Acute neuronal recordings performed with metal microelectrodes in nonhuman primates allow investigating the neural substrate of complex cognitive behaviors. Yet the daily reinsertion and positioning of the electrodes prevents recording from many neurons simultaneously, limiting the suitability of these types of recordings for brain-computer interface applications or for large-scale population statistical methods on a trial-by-trial basis. In contrast, chronically implanted multielectrode arrays offer the opportunity to record from many neurons simultaneously, but immovable electrodes prevent optimization of the signal during and after implantation and cause the tissue response to progressively impair the transduced signal quality, thereby limiting the number of different neurons that can be recorded over the lifetime of the implant. Semichronically implanted matrices of electrodes, instead, allow individually movable electrodes in depth and achieve higher channel count compared with acute methods, hence partially overcoming these limitations. Existing semichronic systems with higher channel count lack computerized control of electrode movements, leading to limited user-friendliness and uncertainty in depth positioning. Here we demonstrate a chronically implantable adaptive multielectrode positioning system with detachable drive for computerized depth adjustment of individual electrodes over several millimeters. This semichronic 16-channel system is designed to optimize the simultaneous yield of units in an extended period following implantation since the electrodes can be independently depth adjusted with minimal effort and their signal quality continuously assessed. Importantly, the electrode array is designed to remain within a chronic recording chamber for a prolonged time or can be used for acute recordings with high signal-to-noise ratio in the cerebral cortex of nonhuman primates. NEW & NOTEWORTHY We present a 16-channel motorized, semichronic multielectrode array with individually depth-adjustable electrodes to record in the cerebral cortex of nonhuman primates. Compared with fixed-geometry arrays, this system allows repeated reestablishing of single neuron isolation. Compared with manually adjustable arrays it benefits from computer-controlled positioning. Compared with motorized semichronic systems it allows higher channel counts due to a robotic single actuator approach. Overall the system is designed to optimize the simultaneous yield of units over the course of implantation.
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Affiliation(s)
- E. Ferrea
- German Primate Center, Sensorimotor Group, Goettingen, Germany
| | | | - D. Hoehl
- Thomas RECORDING, Giessen, Germany
| | | | - A. Gail
- German Primate Center, Sensorimotor Group, Goettingen, Germany
- University of Goettingen, Georg-Elias-Mueller Institute of Psychology, Goettingen, Germany
- Bernstein Center for Computational Neuroscience, Goettingen, Germany
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19
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Wu S, Gan G, Zhang Z, Sun J, Wang Q, Gao Z, Li M, Jin S, Huang J, Thomas U, Jiang YH, Li Y, Tian R, Zhang YQ. A Presynaptic Function of Shank Protein in Drosophila. J Neurosci 2017; 37:11592-11604. [PMID: 29074576 PMCID: PMC6705749 DOI: 10.1523/jneurosci.0893-17.2017] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [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: 03/27/2017] [Revised: 10/11/2017] [Indexed: 11/21/2022] Open
Abstract
Human genetic studies support that loss-of-function mutations in the SH3 domain and ankyrin repeat containing family proteins (SHANK1-3), the large synaptic scaffolding proteins enriched at the postsynaptic density of excitatory synapses, are causative for autism spectrum disorder and other neuropsychiatric disorders in humans. To better understand the in vivo functions of Shank and facilitate dissection of neuropathology associated with SHANK mutations in human, we generated multiple mutations in the Shank gene, the only member of the SHANK family in Drosophila melanogaster Both male and female Shank null mutants were fully viable and fertile with no apparent morphological or developmental defects. Expression analysis revealed apparent enrichment of Shank in the neuropils of the CNS. Specifically, Shank coexpressed with another PSD scaffold protein, Homer, in the calyx of mushroom bodies in the brain. Consistent with high expression in mushroom body calyces, Shank mutants show an abnormal calyx structure and reduced olfactory acuity. These morphological and functional phenotypes were fully rescued by pan-neuronal reexpression of Shank, and only partially rescued by presynaptic but no rescue by postsynaptic reexpression of Shank. Our findings thus establish a previously unappreciated presynaptic function of Shank.SIGNIFICANCE STATEMENT Mutations in SHANK family genes are causative for idiopathic autism spectrum disorder. To understand the neural function of Shank, a large scaffolding protein enriched at the postsynaptic densities, we examined the role of Drosophila Shank in synapse development at the peripheral neuromuscular junctions and the central mushroom body calyx. Our results demonstrate that, in addition to its conventional postsynaptic function, Shank also acts presynaptically in synapse development in the brain. This study offers novel insights into the synaptic role of Shank.
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Affiliation(s)
- Song Wu
- Key Laboratory for Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, University of Chinese Academy of Sciences, Beijing 100101, China
| | - Guangming Gan
- Medical School, Southeast University, Nanjing 210009, China
| | - Zhiping Zhang
- Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Jie Sun
- College of Life Science, Hubei University, Wuhan, Hubei 430062, China
| | - Qifu Wang
- Key Laboratory for Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, University of Chinese Academy of Sciences, Beijing 100101, China
| | - Zhongbao Gao
- Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Meixiang Li
- Key Laboratory for Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, University of Chinese Academy of Sciences, Beijing 100101, China
| | - Shan Jin
- College of Life Science, Hubei University, Wuhan, Hubei 430062, China
| | - Juan Huang
- School of Basic Medical Sciences, Nanjing Medical University, Nanjing 210029, China
| | - Ulrich Thomas
- Leibniz Institute for Neurobiology, Magdeburg 39118, Germany, and
| | - Yong-Hui Jiang
- Departments of Pediatrics and Neurobiology, Duke University School of Medicine, Durham, North Carolina 27710
| | - Yan Li
- Key Laboratory of Brain and Cognitive Sciences, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China
| | - Rui Tian
- Key Laboratory for Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, University of Chinese Academy of Sciences, Beijing 100101, China,
| | - Yong Q Zhang
- Key Laboratory for Molecular and Developmental Biology, Institute of Genetics and Developmental Biology, University of Chinese Academy of Sciences, Beijing 100101, China,
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20
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Bot C, Stölzle-Feix S, Becker N, Thomas U, Juhasz K, Doerr L, Beckler M, Haarmann C, Obergrussberger A, Rapedius M, Götze T, Vogel M, George M, Brüggemann A, Haedo R, Fertig N. An “All Inclusive “Package for Cardiac Safety: The Six Big on One Automated Patch Clamp Chip. J Pharmacol Toxicol Methods 2017. [DOI: 10.1016/j.vascn.2017.09.090] [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: 10/18/2022]
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21
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Bot C, Stölzle-Feix S, Becker N, Thomas U, Juhasz K, Doerr L, Beckler M, George M, Brüggemann A, Haedo R, Fertig N. Impedance and Extracellular Field Potential for Cardiac Safety Assays: A Combined Approach for Non-Invasive Screening of iPS Cells. J Pharmacol Toxicol Methods 2017. [DOI: 10.1016/j.vascn.2017.09.222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Rogers M, Ridley J, El Haou S, Williams S, Webdale L, Sutton K, Stoelzle-Feix S, Thomas U, Fertig N, Zwetsloot T, Devalla H, Passier R. Human Ventricular Stem Cell Cardiomyocytes: Validating In Vitro Assays and Screening Platforms for Pro-arrhythmia Risk Prediction. J Pharmacol Toxicol Methods 2017. [DOI: 10.1016/j.vascn.2017.09.238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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23
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Stoelzle-Feix S, Beckler M, Mumm P, Thomas U, Doerr L, Dragicevic E, Juhasz K, Bot CT, George M, Brüggemann A, Fertig N, Rolland JF, Rizzetto R, Redaelli L, Sasse P. Optical Stimulation of iPS Cardiomyocytes allows Brand New Insights into Contractility and Electropyhsiology Conjunctions. Biophys J 2017. [DOI: 10.1016/j.bpj.2016.11.889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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24
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Erdmann I, Marter K, Kobler O, Niehues S, Bussmann J, Müller A, Abele J, Storkebaum E, Thomas U, Dieterich D. Cell Type-specific Metabolic Labeling of Proteins with Azidonorleucine in Drosophila. Bio Protoc 2017. [DOI: 10.21769/bioprotoc.2397] [Citation(s) in RCA: 2] [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: 11/02/2022] Open
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25
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Voigt A, Freund R, Heck J, Missler M, Obermair GJ, Thomas U, Heine M. Dynamic association of calcium channel subunits at the cellular membrane. Neurophotonics 2016; 3:041809. [PMID: 27872869 PMCID: PMC5093230 DOI: 10.1117/1.nph.3.4.041809] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 10/10/2016] [Indexed: 05/25/2023]
Abstract
High voltage gated calcium channels (VGCCs) are composed of at least three subunits, one pore forming [Formula: see text]-subunit, an intracellular [Formula: see text]-variant, and a mostly extracellular [Formula: see text]-variant. Interactions between these subunits determine the kinetic properties of VGCCs. It is unclear whether these interactions are stable over time or rather transient. Here, we used single-molecule tracking to investigate the surface diffusion of [Formula: see text]- and [Formula: see text]-subunits at the cell surface. We found that [Formula: see text]-subunits show higher surface mobility than [Formula: see text]-subunits, and that they are only transiently confined together, suggesting a weak association between [Formula: see text]- and [Formula: see text]-subunits. Moreover, we observed that different [Formula: see text]-subunits engage in different degrees of association with the [Formula: see text]-subunit, revealing the tighter interaction of [Formula: see text] with [Formula: see text]. These data indicate a distinct regulation of the [Formula: see text] interaction in VGCC subtypes. We modeled their membrane dynamics in a Monte Carlo simulation using experimentally determined diffusion constants. Our modeling predicts that the ratio of associated [Formula: see text]- and [Formula: see text]-subunits mainly depends on their expression density and confinement in the membrane. Based on the different motilities of particular [Formula: see text]-subunit combinations, we propose that their dynamic assembly and disassembly represent an important mechanism to regulate the signaling properties of VGCC.
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Affiliation(s)
- Andreas Voigt
- Otto-von-Guericke-University of Magdeburg, Lehrstuhl Systemverfahrenstechnik, Universitätsplatz 2, Magdeburg D-39106, Germany
| | - Romy Freund
- Leibniz-Institute of Neurobiology, Research Group Molecular Physiology, Brenneckestrasse 6, Magdeburg D-39118, Germany
| | - Jennifer Heck
- Leibniz-Institute of Neurobiology, Research Group Molecular Physiology, Brenneckestrasse 6, Magdeburg D-39118, Germany
| | - Markus Missler
- Westfälische Wilhelms-University, Institute of Anatomy and Molecular Neurobiology, Vesaliusweg 2, Münster 48149, Germany
| | - Gerald J. Obermair
- Medical University Innsbruck, Division of Physiology, Department of Physiology and Medical Physics, Schöpfstrasse 41, Innsbruck 6020, Austria
| | - Ulrich Thomas
- Leibniz-Institute of Neurobiology, Department Neurochemistry, Brenneckestrasse 6, Magdeburg D-39118, Germany
| | - Martin Heine
- Leibniz-Institute of Neurobiology, Research Group Molecular Physiology, Brenneckestrasse 6, Magdeburg D-39118, Germany
- Otto-von-Guericke-University Magdeburg, Center for Behavioral Brain Sciences (CBBS), Universitätsplatz 2, Magdeburg D-39106, Germany
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Polonchuk L, Thomas U, Davies M, Sanchez RA, Schuler F, Singer T, Stoelzle_Feix S. Novel assessment of cardiomyocyte functions with hybrid MEA-impedance technology on CardioExcyte 96. J Pharmacol Toxicol Methods 2016. [DOI: 10.1016/j.vascn.2016.02.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Melo-Thomas L, Engelhardt A, Thomas U, Hoehl D, Bremmer F, Schwarting R. EP 61. Performing deep brain stimulation and neural recordings at the same target from awake animals: A new bidirectional wireless device. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2016.05.249] [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: 11/15/2022]
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Bot C, Stoelzle-Feix S, Becker N, Juhasz K, Thomas U, Doerr L, Haedo R, Beckler M, Oestreich J, George M, Brüggemann A, Fertig N. Impedance and Combined Extracellular Field Potential Recordings of CiPA Reference Compounds on IPS Cardiomyocytes. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.1474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Lukas K, Thomas U, Gessner A, Wehner D, Schmid T, Schmid C, Lehle K. Plasma functionalization of polycarbonaturethane to improve endothelialization—Effect of shear stress as a critical factor for biocompatibility control. J Biomater Appl 2016; 30:1417-28. [DOI: 10.1177/0885328215626072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Medical devices made of polycarbonaturethane (PCU) combine excellent mechanical properties and little biological degradation, but restricted hemocompatibility. Modifications of PCU might reduce platelet adhesion and promote stable endothelialization. PCU was modified using gas plasma treatment, binding of hydrogels, and coupling of cell-active molecules (modified heparin, anti-thrombin III (ATIII), argatroban, fibronectin, laminin-nonapeptide, peptides with integrin-binding arginine-glycine-aspartic acid (RGD) motif). Biocompatibility was verified with static and dynamic cell culture techniques. Blinded analysis focused on improvement in endothelial cell (EC) adhesion/proliferation, anti-thrombogenicity, reproducible manufacturing process, and shear stress tolerance of ECs. EC adhesion and antithrombogenicity were achieved with 9/35 modifications. Additionally, 6/9 stimulated EC proliferation and 3/6 modification processes were highly reproducible for endothelialization. The latter modifications comprised immobilization of ATIII (A), polyethyleneglycole-diamine-hydrogel (E) and polyethylenimine-hydrogel connected with modified heparin (IH). Under sheer stress, only the IH modification improved EC adhesion within the graft. However, ECs did not arrange in flow direction and cell anchorage was restricted. Despite large variation in surface modification chemistry and improved EC adhesion under static culture conditions, additional introduction of shear stress foiled promising preliminary data. Therefore, biocompatibility testing required not only static tests but also usage of physiological conditions such as shear stress in the case of vascular grafts.
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Affiliation(s)
- Karin Lukas
- IMHR, Institute for Medical Microbiology and Hygiene, University of Regensburg, Regensburg, Germany
| | | | - André Gessner
- IMHR, Institute for Medical Microbiology and Hygiene, University of Regensburg, Regensburg, Germany
| | | | | | - Christof Schmid
- Department of Cardiothoracic Surgery, University Hospital Regensburg, Regensburg, Germany
| | - Karla Lehle
- Department of Cardiothoracic Surgery, University Hospital Regensburg, Regensburg, Germany
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Bot C, Guinot D, Thomas U, Doerr L, Stoelzle-Feix S, Beckler M, Okeyo G, Oestreich J, Haedo R, George M, Fertig N. Cardiotoxicity screening using the CardioExcyte 96: A noninvasive methodology of combining extracellular field potential and impedance measurements. J Pharmacol Toxicol Methods 2015. [DOI: 10.1016/j.vascn.2015.08.117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Erdmann I, Marter K, Kobler O, Niehues S, Abele J, Müller A, Bussmann J, Storkebaum E, Ziv T, Thomas U, Dieterich DC. Cell-selective labelling of proteomes in Drosophila melanogaster. Nat Commun 2015; 6:7521. [PMID: 26138272 PMCID: PMC4507001 DOI: 10.1038/ncomms8521] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [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: 08/14/2014] [Accepted: 05/16/2015] [Indexed: 01/06/2023] Open
Abstract
The specification and adaptability of cells rely on changes in protein composition. Nonetheless, uncovering proteome dynamics with cell-type-specific resolution remains challenging. Here we introduce a strategy for cell-specific analysis of newly synthesized proteomes by combining targeted expression of a mutated methionyl-tRNA synthetase (MetRS) with bioorthogonal or fluorescent non-canonical amino-acid-tagging techniques (BONCAT or FUNCAT). Substituting leucine by glycine within the MetRS-binding pocket (MetRSLtoG) enables incorporation of the non-canonical amino acid azidonorleucine (ANL) instead of methionine during translation. Newly synthesized proteins can thus be labelled by coupling the azide group of ANL to alkyne-bearing tags through ‘click chemistry'. To test these methods for applicability in vivo, we expressed MetRSLtoG cell specifically in Drosophila. FUNCAT and BONCAT reveal ANL incorporation into proteins selectively in cells expressing the mutated enzyme. Cell-type-specific FUNCAT and BONCAT, thus, constitute eligible techniques to study protein synthesis-dependent processes in complex and behaving organisms. Mutated tRNA synthetases can incorporate non-canonical amino acids into proteins. Erdmann et al. exploit this property to metabolically label newly synthesized proteins in selected cell types in Drosophila, and demonstrate their detection using proteomics (BONCAT) and fluorescence imaging (FUNCAT).
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Affiliation(s)
- Ines Erdmann
- 1] Research Group Neuronal Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University Magdeburg, Magdeburg 39120, Germany [2] Research Group Neuralomics, Leibniz Institute for Neurobiology, Magdeburg 39118, Germany
| | - Kathrin Marter
- 1] Research Group Neuronal Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University Magdeburg, Magdeburg 39120, Germany [2] Research Group Neuralomics, Leibniz Institute for Neurobiology, Magdeburg 39118, Germany
| | - Oliver Kobler
- Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg 39118, Germany
| | - Sven Niehues
- 1] Molecular Neurogenetics Laboratory, Max Planck Institute for Molecular Biomedicine, Münster 48149, Germany [2] Faculty of Medicine, University of Münster, Münster 48149, Germany
| | - Julia Abele
- 1] Research Group Neuronal Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University Magdeburg, Magdeburg 39120, Germany [2] Research Group Neuralomics, Leibniz Institute for Neurobiology, Magdeburg 39118, Germany
| | - Anke Müller
- 1] Research Group Neuronal Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University Magdeburg, Magdeburg 39120, Germany [2] Research Group Neuralomics, Leibniz Institute for Neurobiology, Magdeburg 39118, Germany
| | - Julia Bussmann
- 1] Molecular Neurogenetics Laboratory, Max Planck Institute for Molecular Biomedicine, Münster 48149, Germany [2] Faculty of Medicine, University of Münster, Münster 48149, Germany
| | - Erik Storkebaum
- 1] Molecular Neurogenetics Laboratory, Max Planck Institute for Molecular Biomedicine, Münster 48149, Germany [2] Faculty of Medicine, University of Münster, Münster 48149, Germany
| | - Tamar Ziv
- Smoler Proteomics Center, Faculty of Biology, Technion, Haifa 32000, Israel
| | - Ulrich Thomas
- Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg 39118, Germany
| | - Daniela C Dieterich
- 1] Research Group Neuronal Plasticity and Communication, Institute for Pharmacology and Toxicology, Otto-von-Guericke-University Magdeburg, Magdeburg 39120, Germany [2] Research Group Neuralomics, Leibniz Institute for Neurobiology, Magdeburg 39118, Germany [3] Center for Behavioral Brain Sciences, Magdeburg 39118, Germany
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Niehues S, Bussmann J, Steffes G, Erdmann I, Köhrer C, Sun L, Wagner M, Schäfer K, Wang G, Koerdt SN, Stum M, Jaiswal S, RajBhandary UL, Thomas U, Aberle H, Burgess RW, Yang XL, Dieterich D, Storkebaum E. Impaired protein translation in Drosophila models for Charcot-Marie-Tooth neuropathy caused by mutant tRNA synthetases. Nat Commun 2015; 6:7520. [PMID: 26138142 PMCID: PMC4506996 DOI: 10.1038/ncomms8520] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Accepted: 05/16/2015] [Indexed: 01/06/2023] Open
Abstract
Dominant mutations in five tRNA synthetases cause Charcot-Marie-Tooth (CMT) neuropathy, suggesting that altered aminoacylation function underlies the disease. However, previous studies showed that loss of aminoacylation activity is not required to cause CMT. Here we present a Drosophila model for CMT with mutations in glycyl-tRNA synthetase (GARS). Expression of three CMT-mutant GARS proteins induces defects in motor performance and motor and sensory neuron morphology, and shortens lifespan. Mutant GARS proteins display normal subcellular localization but markedly reduce global protein synthesis in motor and sensory neurons, or when ubiquitously expressed in adults, as revealed by FUNCAT and BONCAT. Translational slowdown is not attributable to altered tRNA(Gly) aminoacylation, and cannot be rescued by Drosophila Gars overexpression, indicating a gain-of-toxic-function mechanism. Expression of CMT-mutant tyrosyl-tRNA synthetase also impairs translation, suggesting a common pathogenic mechanism. Finally, genetic reduction of translation is sufficient to induce CMT-like phenotypes, indicating a causal contribution of translational slowdown to CMT.
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Affiliation(s)
- Sven Niehues
- 1] Molecular Neurogenetics Laboratory, Max Planck Institute for Molecular Biomedicine, 48149 Münster, Germany [2] Faculty of Medicine, University of Münster, 48149 Münster, Germany
| | - Julia Bussmann
- 1] Molecular Neurogenetics Laboratory, Max Planck Institute for Molecular Biomedicine, 48149 Münster, Germany [2] Faculty of Medicine, University of Münster, 48149 Münster, Germany
| | - Georg Steffes
- 1] Molecular Neurogenetics Laboratory, Max Planck Institute for Molecular Biomedicine, 48149 Münster, Germany [2] Faculty of Medicine, University of Münster, 48149 Münster, Germany
| | - Ines Erdmann
- 1] Research Group Neuralomics, Leibniz Institute for Neurobiology, 39118 Magdeburg, Germany [2] Institute for Pharmacology and Toxicology, Otto-von-Guericke-University, 39120 Magdeburg, Germany
| | - Caroline Köhrer
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Litao Sun
- The Scripps Research Institute, La Jolla, California 92037, USA
| | - Marina Wagner
- 1] Molecular Neurogenetics Laboratory, Max Planck Institute for Molecular Biomedicine, 48149 Münster, Germany [2] Faculty of Medicine, University of Münster, 48149 Münster, Germany
| | - Kerstin Schäfer
- 1] Molecular Neurogenetics Laboratory, Max Planck Institute for Molecular Biomedicine, 48149 Münster, Germany [2] Faculty of Medicine, University of Münster, 48149 Münster, Germany
| | - Guangxia Wang
- 1] Molecular Neurogenetics Laboratory, Max Planck Institute for Molecular Biomedicine, 48149 Münster, Germany [2] Faculty of Medicine, University of Münster, 48149 Münster, Germany
| | - Sophia N Koerdt
- 1] Molecular Neurogenetics Laboratory, Max Planck Institute for Molecular Biomedicine, 48149 Münster, Germany [2] Faculty of Medicine, University of Münster, 48149 Münster, Germany
| | - Morgane Stum
- The Jackson Laboratory, Bar Harbor, Maine 04609, USA
| | | | - Uttam L RajBhandary
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Ulrich Thomas
- Department of Neurochemistry and Molecular Biology, Leibniz Institute for Neurobiology, 39118 Magdeburg, Germany
| | - Hermann Aberle
- Functional Cell Morphology Lab, Heinrich Heine University, 40225 Düsseldorf, Germany
| | | | - Xiang-Lei Yang
- The Scripps Research Institute, La Jolla, California 92037, USA
| | - Daniela Dieterich
- 1] Research Group Neuralomics, Leibniz Institute for Neurobiology, 39118 Magdeburg, Germany [2] Institute for Pharmacology and Toxicology, Otto-von-Guericke-University, 39120 Magdeburg, Germany
| | - Erik Storkebaum
- 1] Molecular Neurogenetics Laboratory, Max Planck Institute for Molecular Biomedicine, 48149 Münster, Germany [2] Faculty of Medicine, University of Münster, 48149 Münster, Germany
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Schneider R, Hosy E, Kohl J, Klueva J, Choquet D, Thomas U, Voigt A, Heine M. Mobility of calcium channels in the presynaptic membrane. Neuron 2015; 86:672-9. [PMID: 25892305 DOI: 10.1016/j.neuron.2015.03.050] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Revised: 02/03/2015] [Accepted: 03/09/2015] [Indexed: 12/20/2022]
Abstract
Unravelling principles underlying neurotransmitter release are key to understand neural signaling. Here, we describe how surface mobility of voltage-dependent calcium channels (VDCCs) modulates release probabilities (P(r)) of synaptic vesicles (SVs). Coupling distances of <10 to >100 nm have been reported for SVs and VDCCs in different synapses. Tracking individual VDCCs revealed that within hippocampal synapses, ∼60% of VDCCs are mobile while confined to presynaptic membrane compartments. Intracellular Ca(2+) chelation decreased VDCC mobility. Increasing VDCC surface populations by co-expression of the α2δ1 subunit did not alter channel mobility but led to enlarged active zones (AZs) rather than higher channel densities. VDCCs thus scale presynaptic scaffolds to maintain local mobility. We propose that dynamic coupling based on mobile VDCCs supports calcium domain cooperativity and tunes neurotransmitter release by equalizing Pr for docked SVs within AZs.
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Affiliation(s)
- Romy Schneider
- Molecular Physiology Group, Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany
| | - Eric Hosy
- University of Bordeaux, F-33000 Bordeaux, France; CNRS, Interdisciplinary Institute for Neuroscience, UMR 5297, F-33000 Bordeaux, France
| | - Johannes Kohl
- Harvard University, Department Molecular and Cellular Biology, Cambridge, MA 02138, USA
| | - Julia Klueva
- Molecular Physiology Group, Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany; Presynaptic Plasticity Group, Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany
| | - Daniel Choquet
- University of Bordeaux, F-33000 Bordeaux, France; CNRS, Interdisciplinary Institute for Neuroscience, UMR 5297, F-33000 Bordeaux, France; Bordeaux Imaging Center, UMS 3420 CNRS, US4 INSERM, University of Bordeaux, F-33000 Bordeaux, France
| | - Ulrich Thomas
- Department Neurochemistry, Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany
| | - Andreas Voigt
- Otto-von-Guericke-University Magdeburg, Systemverfahrenstechnik, Universitätsplatz 2, D-39106 Magdeburg, Germany
| | - Martin Heine
- Molecular Physiology Group, Leibniz Institute for Neurobiology, D-39118 Magdeburg, Germany.
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Doerr L, Thomas U, Guinot DR, Bot CT, Stoelzle-Feix S, Beckler M, George M, Fertig N. New easy-to-use hybrid system for extracellular potential and impedance recordings. ACTA ACUST UNITED AC 2014; 20:175-88. [PMID: 25532527 DOI: 10.1177/2211068214562832] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [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: 01/25/2023]
Abstract
The need for predictive, in vitro cardiac safety screening drives further development of automated, high-throughput-compatible drug evaluation based on cardiac cell preparations. Recently, pluripotent stem cells are evaluated as a new, more predictive model for cardiovascular risk assessment pertaining to in vitro assays. We present a new screening platform, the CardioExcyte 96, a hybrid instrument that combines impedance (cell contractility) with extracellular field potential (EFP) recordings. The electrophysiological measurements are noninvasive, label free and have a temporal resolution of 1 ms. This hybrid technology addresses the lack of easy-to-use high-throughput screening for in vitro assays and permits the reliable investigation of short- and long-term pharmacological effects. Several models of cardiomyocyte preparations were successfully validated for use with the CardioExcyte96. Furthermore, the pharmacological effects of a number of reference compounds were evaluated. Compound effects on cell monolayers of human-induced pluripotent stem cell-derived cardiomyocytes are evaluated using a quasi-simultaneous hybrid recording mode that combines impedance and EFP readouts. A specialized software package for rapid data handling and real-time analysis was developed, which allows for comprehensive investigation of the cellular beat signal. Combining impedance readouts of cell contractility and EFP (microelectrode array-like) recordings, the system opens up new possibilities in the field of in vitro cardiac safety assessment.
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Affiliation(s)
- Leo Doerr
- Nanion Technologies GmbH, Munich, Germany
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Stölzle S, Rubenchik O, Tenelsen J, Metzger P, Schwarzenberger T, Thomas U, Kettenhofen R. Automated patch clamp and an impedance-based assay system with cardiomyocytes derived from pluripotent stem cells as a predictive tool for cardiac safety pharmacology. J Pharmacol Toxicol Methods 2014. [DOI: 10.1016/j.vascn.2014.03.150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Guinot D, Schwarzenberger T, Stoelzle S, Thomas U, George M, Brüggemann A, Fertig N. Exciting new impedance and automated patch clamp for safety screening and drug discovery. J Pharmacol Toxicol Methods 2014. [DOI: 10.1016/j.vascn.2014.03.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Steel D, Thomas U, Danielsson S, Dahlenborg K, Stoelzle S, Schwarzenberger T, Guinot D, Fertig N, Sartipy P. Adverse cardiotoxic side effects on contractility analyzed with impedance technology in a human stem cell-derived 3D model. J Pharmacol Toxicol Methods 2014. [DOI: 10.1016/j.vascn.2014.03.147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Koch N, Kobler O, Thomas U, Qualmann B, Kessels MM. Terminal axonal arborization and synaptic bouton formation critically rely on abp1 and the arp2/3 complex. PLoS One 2014; 9:e97692. [PMID: 24841972 PMCID: PMC4026379 DOI: 10.1371/journal.pone.0097692] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Accepted: 04/23/2014] [Indexed: 01/12/2023] Open
Abstract
Neuronal network formation depends on properly timed and localized generation of presynaptic as well as postsynaptic structures. Although of utmost importance for understanding development and plasticity of the nervous system and neurodegenerative diseases, the molecular mechanisms that ensure the fine-control needed for coordinated establishment of pre- and postsynapses are still largely unknown. We show that the F-actin-binding protein Abp1 is prominently expressed in the Drosophila nervous system and reveal that Abp1 is an important regulator in shaping glutamatergic neuromuscular junctions (NMJs) of flies. STED microscopy shows that Abp1 accumulations can be found in close proximity of synaptic vesicles and at the cell cortex in nerve terminals. Abp1 knock-out larvae have locomotion defects and underdeveloped NMJs that are characterized by a reduced number of both type Ib synaptic boutons and branches of motornerve terminals. Abp1 is able to indirectly trigger Arp2/3 complex-mediated actin nucleation and interacts with both WASP and Scar. Consistently, Arp2 and Arp3 loss-of-function also resulted in impairments of bouton formation and arborization at NMJs, i.e. fully phenocopied abp1 knock-out. Interestingly, neuron- and muscle-specific rescue experiments revealed that synaptic bouton formation critically depends on presynaptic Abp1, whereas the NMJ branching defects can be compensated for by restoring Abp1 functions at either side. In line with this presynaptic importance of Abp1, also presynaptic Arp2 and Arp3 are crucial for the formation of type Ib synaptic boutons. Interestingly, presynaptic Abp1 functions in NMJ formation were fully dependent on the Arp2/3 complex, as revealed by suppression of Abp1-induced synaptic bouton formation and branching of axon terminals upon presynaptic Arp2 RNAi. These data reveal that Abp1 and Arp2/3 complex-mediated actin cytoskeletal dynamics drive both synaptic bouton formation and NMJ branching. Our data furthermore shed light on an intense bidirectional functional crosstalk between pre- and postsynapses during the development of synaptic contacts.
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Affiliation(s)
- Nicole Koch
- Institute for Biochemistry I, Jena University Hospital - Friedrich Schiller University Jena, Jena, Germany
- Research Group Membrane Trafficking and Cytoskeleton, Department of Neurochemistry & Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Oliver Kobler
- Research Group Functional Genetics of the Synapse, Department of Neurochemistry & Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Ulrich Thomas
- Research Group Functional Genetics of the Synapse, Department of Neurochemistry & Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
- * E-mail: (UT); (BQ); (MMK)
| | - Britta Qualmann
- Institute for Biochemistry I, Jena University Hospital - Friedrich Schiller University Jena, Jena, Germany
- * E-mail: (UT); (BQ); (MMK)
| | - Michael M. Kessels
- Institute for Biochemistry I, Jena University Hospital - Friedrich Schiller University Jena, Jena, Germany
- Research Group Membrane Trafficking and Cytoskeleton, Department of Neurochemistry & Molecular Biology, Leibniz Institute for Neurobiology, Magdeburg, Germany
- * E-mail: (UT); (BQ); (MMK)
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Korthals M, Schilling K, Reichardt P, Mamula D, Schlüter T, Steiner M, Langnäse K, Thomas U, Gundelfinger E, Premont RT, Tedford K, Fischer KD. αPIX RhoGEF Supports Positive Selection by Restraining Migration and Promoting Arrest of Thymocytes. J I 2014; 192:3228-38. [DOI: 10.4049/jimmunol.1302585] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Matkovic T, Siebert M, Knoche E, Depner H, Mertel S, Owald D, Schmidt M, Thomas U, Sickmann A, Kamin D, Hell SW, Bürger J, Hollmann C, Mielke T, Wichmann C, Sigrist SJ. The Bruchpilot cytomatrix determines the size of the readily releasable pool of synaptic vesicles. ACTA ACUST UNITED AC 2013; 202:667-83. [PMID: 23960145 PMCID: PMC3747298 DOI: 10.1083/jcb.201301072] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [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: 11/22/2022]
Abstract
Two Bruchpilot isoforms create a stereotypic arrangement of the cytomatrix that defines the size of the readily releasable pool of synaptic vesicles. Synaptic vesicles (SVs) fuse at a specialized membrane domain called the active zone (AZ), covered by a conserved cytomatrix. How exactly cytomatrix components intersect with SV release remains insufficiently understood. We showed previously that loss of the Drosophila melanogaster ELKS family protein Bruchpilot (BRP) eliminates the cytomatrix (T bar) and declusters Ca2+ channels. In this paper, we explored additional functions of the cytomatrix, starting with the biochemical identification of two BRP isoforms. Both isoforms alternated in a circular array and were important for proper T-bar formation. Basal transmission was decreased in isoform-specific mutants, which we attributed to a reduction in the size of the readily releasable pool (RRP) of SVs. We also found a corresponding reduction in the number of SVs docked close to the remaining cytomatrix. We propose that the macromolecular architecture created by the alternating pattern of the BRP isoforms determines the number of Ca2+ channel-coupled SV release slots available per AZ and thereby sets the size of the RRP.
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Affiliation(s)
- Tanja Matkovic
- Neurogenetik, Institut für Biologie, Freie Universität Berlin, 14195 Berlin, Germany
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Koch N, Dharmalingam E, Westermann M, Qualmann B, Thomas U, Kessels MM. Abp1 utilizes the Arp2/3 complex activator Scar/WAVE in bristle development. J Cell Sci 2012; 125:3578-89. [PMID: 22467854 DOI: 10.1242/jcs.101451] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Many developmental processes rely on cortical actin dynamics; however, the mechanisms of its fine control at the cell cortex are still largely unknown. Our analyses demonstrate that the lipid- and F-actin-binding protein Abp1 is crucial for actin-driven bristle development in Drosophila melanogaster. Combined genetic, cell biological and biochemical analyses reveal that Abp1 triggers cortical Arp2/3-mediated actin nucleation by complex formation with Scar in bristle development. The role of the plasma-membrane-associated Abp1 subpool was highlighted by constitutively membrane-anchored Abp1. Such gain-of-function experiments led to a severe split-bristle phenotype, which was negatively correlated with bristle length. This phenotype was dependent on Scar but not on WASP and required the Scar-interacting SH3 domain of Abp1. Strikingly, knockout of abp1 led to defects in both microchaete and macrochaete bristle integrity. Importantly, Arp2- and Scar-deficient flies displayed similar bristle phenotypes. Microchaetes of flies deficient for Abp1, Arp2 and Scar functions had kinks, whereas those of wasp heterozygous flies did not. Electron microscopy analyses revealed that abp1 knockout, Arp2 RNAi and Scar RNAi all led to distorted macrochaetes with an excessive number of ridges. Interestingly, despite the physical association of Abp1 with Scar and its ability to use the Arp2/3 complex activator as an effector, abp1 knockout did not affect Scar stability. This is in contrast to classical Scar complex components, such as Kette or Sra-1. Our work reveals that Abp1 is an important, Scar-interacting factor controlling cortical Arp2/3-mediated actin nucleation and unravels a novel layer of complexity in the scrupulous control of cortical actin nucleation during sensory organ formation.
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Affiliation(s)
- Nicole Koch
- Institute for Biochemistry I, Jena University Hospital - Friedrich Schiller University Jena, 07743 Jena, Germany
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Doerr C, Hoehl D, Thomas U, Schanze T. ROC-testing of a spike sorting algorithm. BIOMED ENG-BIOMED TE 2012. [DOI: 10.1515/bmt-2012-4419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Chen Y, Yuanxiang P, Knöpfel T, Thomas U, Behnisch T. Hippocampal LTP triggers proteasome-mediated SPAR degradation in CA1 neurons. Synapse 2011; 66:142-50. [DOI: 10.1002/syn.20994] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Accepted: 09/28/2011] [Indexed: 12/30/2022]
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Thomas U, Kobler O, Gundelfinger ED. TheDrosophilaLarval Neuromuscular Junction as a Model for Scaffold Complexes at Glutamatergic Synapses: Benefits and Limitations. J Neurogenet 2010; 24:109-19. [DOI: 10.3109/01677063.2010.493589] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Langnaese K, Richter K, Smalla KH, Krauss M, Thomas U, Wolf G, Laube G. Splice-isoform specific immunolocalization of neuronal nitric oxide synthase in mouse and rat brain reveals that the PDZ-complex-building nNOSalpha beta-finger is largely exposed to antibodies. Dev Neurobiol 2007; 67:422-37. [PMID: 17443799 DOI: 10.1002/dneu.20317] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Knock out mice deficient for the splice-isoform alphaalpha of neuronal nitric oxide synthase (nNOSalphaalpha) display residual nitric oxide synthase activity and immunosignal. To attribute this signal to the two minor neuronal nitric oxide synthase splice variants, betabeta and gammagamma, we generated isoform-specific anti-peptide antibodies against the nNOSalphaalpha specific betabeta-finger motif involved in PDZ domain scaffolding and the nNOSbetabeta specific N-terminus. The nNOSalphaalpha betabeta-finger-specific antibody clearly recognized the 160-kDa band of recombinant nNOSalphaalpha on Western blots. Using immunocytochemistry, this antibody displayed, in rats and wild-type mice, a labeling pattern similar to but not identical with that obtained using a commercial pan-nNOS antibody. This similarity indicates that the majority of immunocytochemically detectable nNOS is not likely to be complexed with PDZ-domain proteins via the betabeta-finger motif. This conclusion was confirmed by the inhibition of PSD-95/nNOS interaction by the nNOSalphaalpha betabeta-finger antibody in pull-down assays. By contrast, nNOSalphaalpha betabeta-finger labeling was clearly reduced in hippocampal and cortical neuropil areas enriched in NMDA receptor complex containing spine synapses. In nNOSalphaalpha knock out mice, nNOSalphaalpha was not detectable, whereas the pan-nNOS antibody showed a distinct labeling of cell bodies throughout the brain, most likely reflecting betabeta/gammagamma-isoforms in these cells. The nNOSbetabeta antibody clearly detected bacterial expressed nNOSbetabeta fusion protein and nNOSbetabeta in overexpressing HEK cells by Western blotting. Immunocytochemically, individual cell bodies in striatum, cerebral cortex, and in some brain stem nuclei were labeled in knock out but not in wild-type mice, indicating an upregulation of nNOSbetabeta in nNOSalphaalpha deficient animals.
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Affiliation(s)
- Kristina Langnaese
- Institut für Medizinische Neurobiologie, Otto-von-Guericke-Universität Magdeburg, Leipziger Str. 44, 39120 Magdeburg, Germany
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Sandoval M, Sandoval R, Thomas U, Spilker C, Smalla KH, Falcon R, Marengo JJ, Calderón R, Saavedra V, Heumann R, Bronfman F, Garner CC, Gundelfinger ED, Wyneken U. Antagonistic effects of TrkB and p75NTRon NMDA receptor currents in post-synaptic densities transplanted into Xenopus oocytes. J Neurochem 2007; 101:1672-84. [PMID: 17394529 DOI: 10.1111/j.1471-4159.2007.04519.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Brain-derived neurotrophic factor (BDNF) and its receptor TrkB are essential regulators of synaptic function in the adult CNS. A TrkB-mediated effect at excitatory synapses is enhancement of NMDA receptor (NMDA-R)-mediated currents. Recently, opposing effects of TrkB and the pan-neurotrophin receptor p75(NTR) on long-term synaptic depression and long-term potentiation have been reported in the hippocampus. To further study the regulation of NMDA-Rs by neurotrophin receptors in their native protein environment, we micro-transplanted rat forebrain post-synaptic densities (PSDs) into Xenopus oocytes. One-minute incubations of oocytes with BDNF led to dual effects on NMDA-R currents: either TrkB-dependent potentiation or TrkB-independent inhibition were observed. Pro-nerve growth factor, a ligand for p75(NTR) but not for TrkB, produced a reversible, dose-dependent, TrkB-independent and p75(NTR)-dependent inhibition of NMDA-Rs. Fractionation experiments showed that p75(NTR) is highly enriched in the PSD protein fraction. Immunoprecipitation and pull-down experiments further revealed that p75(NTR) is a core component of the PSD, where it interacts with the PDZ3 domain of the scaffolding protein SAP90/PSD-95. Our data provide striking evidence for a rapid inhibitory effect of p75(NTR) on NMDA-R currents that antagonizes TrkB-mediated NMDA-R potentiation. These opposing mechanisms might be present in a large proportion of forebrain synapses and may contribute importantly to synaptic plasticity.
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Affiliation(s)
- Mauricio Sandoval
- Laboratorio de Neurociencias, Universidad de Los Andes, Santiago, Chile
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Gorczyca D, Ashley J, Speese S, Gherbesi N, Thomas U, Gundelfinger E, Gramates LS, Budnik V. Postsynaptic membrane addition depends on the Discs-Large-interacting t-SNARE Gtaxin. J Neurosci 2007; 27:1033-44. [PMID: 17267557 PMCID: PMC4664082 DOI: 10.1523/jneurosci.3160-06.2007] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [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] [Indexed: 11/21/2022] Open
Abstract
Targeted membrane addition is a hallmark of many cellular functions. In the nervous system, modification of synaptic membrane size has a major impact on synaptic function. However, because of the complex shape of neurons and the need to target membrane addition to very small and polarized synaptic compartments, this process is poorly understood. Here, we show that Gtaxin (GTX), a Drosophila t-SNARE (target-soluble N-ethylmaleimide-sensitive factor attachment protein receptor), is required for expansion of postsynaptic membranes during new synapse formation. Mutations in gtx lead to drastic reductions in postsynaptic membrane surface, whereas gtx upregulation results in the formation of complex membrane structures at ectopic sites. Postsynaptic GTX activity depends on its direct interaction with Discs-Large (DLG), a multidomain scaffolding protein of the PSD-95 (postsynaptic density protein-95) family with key roles in cell polarity and formation of cellular junctions as well as synaptic protein anchoring and trafficking. We show that DLG selectively determines the postsynaptic distribution of GTX to type I, but not to type II or type III boutons on the same cell, thereby defining sites of membrane addition to this unique set of glutamatergic synapses. We provide a mechanistic explanation for selective targeted membrane expansion at specific synaptic junctions.
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Affiliation(s)
- David Gorczyca
- Department of Neurobiology, University of Massachusetts Medical School, Worcester, Massachusetts 01605
| | - James Ashley
- Department of Neurobiology, University of Massachusetts Medical School, Worcester, Massachusetts 01605
| | - Sean Speese
- Department of Neurobiology, University of Massachusetts Medical School, Worcester, Massachusetts 01605
| | - Norberto Gherbesi
- Department of Neurobiology, University of Massachusetts Medical School, Worcester, Massachusetts 01605
| | - Ulrich Thomas
- Leibniz Institute for Neurobiology, 39118 Magdeburg, Germany, and
| | | | - L. Sian Gramates
- Molecular and Cellular Biology Graduate Program, University of Massachusetts at Amherst, Amherst, Massachusetts 01003
| | - Vivian Budnik
- Department of Neurobiology, University of Massachusetts Medical School, Worcester, Massachusetts 01605
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Wasserscheid I, Thomas U, Knust E. Isoform-specific interaction of Flamingo/Starry Night with excess Bazooka affects planar cell polarity in theDrosophila wing. Dev Dyn 2007; 236:1064-71. [PMID: 17304516 DOI: 10.1002/dvdy.21089] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Epithelia display two types of polarity, apical-basal and planar cell polarity (PCP), and both are crucial for morphogenesis and organogenesis. PCP signaling pathways comprise transmembrane proteins, such as Flamingo/Starry Night, and cytoplasmic, membrane-associated proteins such as Dishevelled. During establishment of PCP in the Drosophila wing, PCP proteins accumulate apically in distinct "cortical domains" on proximal and distal plasma membranes. This finding suggests that their localized function depends on prior definition of apicobasal polarity. Here, we show that overexpression of Bazooka, a PDZ-domain protein essential for apicobasal polarity in the embryo, perturbs development of PCP, but has no effect on apicobasal polarity. The PCP phenotype is associated with a failure to restrict Flamingo/Starry night to the proximal and distal plasma membranes of the wing epithelium. We further demonstrate that flamingo expresses two differentially spliced RNAs in wing imaginal discs, which encode two isoforms of the atypical cadherin Flamingo. The predominant Starry night-type form contains a PDZ-binding motif, which mediates binding to Bazooka in vitro. Pull-down assays support the occurrence of such an interaction in wing imaginal discs. The results suggest that interaction between the apicobasal and planar cell polarity systems has to be tightly coordinated to ensure proper morphogenesis of the wing disc epithelium.
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Affiliation(s)
- Isabel Wasserscheid
- Institut für Genetik, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
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Swan LE, Schmidt M, Schwarz T, Ponimaskin E, Prange U, Boeckers T, Thomas U, Sigrist SJ. Complex interaction of Drosophila GRIP PDZ domains and Echinoid during muscle morphogenesis. EMBO J 2006; 25:3640-51. [PMID: 16858411 PMCID: PMC1538559 DOI: 10.1038/sj.emboj.7601216] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [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: 01/25/2006] [Accepted: 06/05/2006] [Indexed: 12/26/2022] Open
Abstract
Glutamate receptor interacting protein (GRIP) homologues, initially characterized in synaptic glutamate receptor trafficking, consist of seven PDZ domains (PDZDs), whose conserved arrangement is of unknown significance. The Drosophila GRIP homologue (DGrip) is needed for proper guidance of embryonic somatic muscles towards epidermal attachment sites, with both excessive and reduced DGrip activity producing specific phenotypes in separate muscle groups. These phenotypes were utilized to analyze the molecular architecture underlying DGrip signaling function in vivo. Surprisingly, removing PDZDs 1-3 (DGripDelta1-3) or deleting ligand binding in PDZDs 1 or 2 convert DGrip to excessive in vivo activity mediated by ligand binding to PDZD 7. Yeast two-hybrid screening identifies the cell adhesion protein Echinoid's (Ed) type II PDZD-interaction motif as binding PDZDs 1, 2 and 7 of DGrip. ed loss-of-function alleles exhibit muscle defects, enhance defects caused by reduced DGrip activity and suppress the dominant DGripDelta1-3 effect during embryonic muscle formation. We propose that Ed and DGrip form a signaling complex, where competition between N-terminal and the C-terminal PDZDs of DGrip for Ed binding controls signaling function.
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Affiliation(s)
- Laura E Swan
- European Neuroscience Institute Göttingen, Göttingen, Germany
- Present address: Department of Cell Biology, Yale School of Medicine, 295 Congress Ave, New Haven, CT 06510, USA
- These authors contributed equally to this work
- Department of Cell Biology, Yale School of Medicine, 295 Congress Ave, New Haven, CT 06510, USA. Tel.: +1 203 737 4473; Fax: +1 203 737 1762; E-mail:
| | - Manuela Schmidt
- European Neuroscience Institute Göttingen, Göttingen, Germany
- Present address: Department of Cell Biology, Yale School of Medicine, 295 Congress Ave, New Haven, CT 06510, USA
| | - Tobias Schwarz
- European Neuroscience Institute Göttingen, Göttingen, Germany
- Department of Neural and Sensory Physiology, University of Göttingen, Göttingen, Germany
| | - Evgeni Ponimaskin
- Department of Neural and Sensory Physiology, University of Göttingen, Göttingen, Germany
| | - Ulrike Prange
- European Neuroscience Institute Göttingen, Göttingen, Germany
| | | | - Ulrich Thomas
- Federal Institute for Neurobiology, Department of Neurochemistry and Molecular Biology, Magdeburg, Germany
| | - Stephan J Sigrist
- European Neuroscience Institute Göttingen, Göttingen, Germany
- Institut für Klinische Neurobiologie und Rudolf-Virchow-Zentrum, Universität Würzburg, Würzburg, Germany
- European Neuroscience Institute, Griesbachstr. 5, 37077 Göttingen, Germany. Tel.: +49 551 391 2350; Fax: +49 551 391 2346; E-mail:
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