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Journal article
Synaptotagmin IV regulates glial glutamate release
Proceedings of the National Academy of Sciences - PNAS, v 101(25), pp 9441-9446
22 Jun 2004
PMID: 15197251
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Calcium-binding synaptotagmins (Syts) are membrane proteins that are conserved from nematode to human. Fifteen Syts (Syts I–XV) have been identified in mammalian species. Syt I has been well studied and is a candidate for the Ca
2+
-sensor that triggers evoked exocytosis underlying fast synaptic transmission. Whereas the functions of the other Syts are unclear, Syt IV is of particular interest because it is rapidly up-regulated after chronic depolarization or seizures, and because null mutations exhibit deficits in fine motor coordination and hippocampus-dependent memory. Screening Syts I–XIII, which are enriched in brain, we find that Syt IV is located in processes of astroglia
in situ
. Reduction of Syt IV in astrocytes by RNA interference decreases Ca
2+
-dependent glutamate release, a gliotransmission pathway that regulates synaptic transmission. Mutants of the C2B domain, the only putative Ca
2+
-binding domain in Syt IV, act in a dominant-negative fashion over Ca
2+
-regulated glial glutamate release, but not gliotransmission induced by changes in osmolarity. Because we find that Syt IV is expressed predominantly by astrocytes and is not in the presynaptic terminals of the hippocampus, and because Syt IV knockout mice exhibit hippocampal-based memory deficits, our data raise the intriguing possibility that Syt IV-mediated gliotransmission contributes to hippocampal-based memory.
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Details
- Title
- Synaptotagmin IV regulates glial glutamate release
- Creators
- Qi Zhang - University of PennsylvaniaMitsunori Fukuda - Thomas Jefferson UniversityElisabeth Van Bockstaele - Thomas Jefferson UniversityOlivier Pascual - Thomas Jefferson UniversityPhilip G. Haydon - Fukuda Denshi (Japan)
- Publication Details
- Proceedings of the National Academy of Sciences - PNAS, v 101(25), pp 9441-9446
- Publisher
- National Academy of Sciences
- Number of pages
- 6
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Pharmacology and Physiology
- Web of Science ID
- WOS:000222278600050
- Scopus ID
- 2-s2.0-3042645396
- Other Identifier
- 991021903410504721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Neurosciences