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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Greengard, P. Jensen, V. Sihra, T. S. Shupliakov, O. Brodin, L. Hvalby, O. Zheng, D. Chin, L. S. Mcnamara, J. O. Li, L. |
| Description | Author Affiliation: Li L ( Laboratory of Molecular and Cellular Neuroscience, Rockefeller University, New York, NY 10021, USA.); |
| Abstract | Synapsin I has been proposed to be involved in the modulation of neurotransmitter release by controlling the availability of synaptic vesicles for exocytosis. To further understand the role of synapsin I in the function of adult nerve terminals, we studied synapsin I-deficient mice generated by homologous recombination. The organization of synaptic vesicles at presynaptic terminals of synapsin I-deficient mice was markedly altered: densely packed vesicles were only present in a narrow rim at active zones, whereas the majority of vesicles were dispersed throughout the terminal area. This was in contrast to the organized vesicle clusters present in terminals of wild-type animals. Release of glutamate from nerve endings, induced by K+,4-aminopyridine, or a Ca2+ ionophore, was markedly decreased in synapsin I mutant mice. The recovery of synaptic transmission after depletion of neurotransmitter by high-frequency stimulation was greatly delayed. Finally, synapsin I-deficient mice exhibited a strikingly increased response to electrical stimulation, as measured by electrographic and behavioral seizures. These results provide strong support for the hypothesis that synapsin I plays a key role in the regulation of nerve terminal function in mature synapses. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 20 |
| Volume Number | 92 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1995-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Hippocampus Physiology Seizures Physiopathology Synapsins Deficiency Synaptic Transmission Synaptic Vesicles Ultrastructure Synaptosomes Animals Cerebral Cortex Metabolism Electric Stimulation Electroencephalography Glutamic Acid Mice Mice, Neurologic Mutants Microscopy, Electron Receptors, Glutamate Reference Values Genetics Synapses Comparative Study Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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