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Synaptic vesicle glycoprotein 2A (SV2A) regulates kindling epileptogenesis via GABAergic neurotransmission.

Authors: Tokudome, Kentaro  Okumura, Takahiro  Shimizu, Saki  Mashimo, Tomoji  Takizawa, Akiko  Serikawa, Tadao  Terada, Ryo  Ishihara, Shizuka  Kunisawa, Naofumi  Sasa, Masashi  Ohno, Yukihiro 
Citation: Tokudome K, etal., Sci Rep. 2016 Jun 6;6:27420. doi: 10.1038/srep27420.
Pubmed: (View Article at PubMed) PMID:27265781
DOI: Full-text: DOI:10.1038/srep27420

Synaptic vesicle glycoprotein 2A (SV2A) is a prototype synaptic vesicle protein regulating action potential-dependent neurotransmitters release. SV2A also serves as a specific binding site for certain antiepileptics and is implicated in the treatment of epilepsy. Here, to elucidate the role of SV2A in modulating epileptogenesis, we generated a novel rat model (Sv2a(L174Q) rat) carrying a Sv2a-targeted missense mutation (L174Q) and analyzed its susceptibilities to kindling development. Although animals homozygous for the Sv2a(L174Q) mutation exhibited normal appearance and development, they are susceptible to pentylenetetrazole (PTZ) seizures. In addition, development of kindling associated with repeated PTZ treatments or focal stimulation of the amygdala was markedly facilitated by the Sv2a(L174Q) mutation. Neurochemical studies revealed that the Sv2a(L174Q) mutation specifically reduced depolarization-induced GABA, but not glutamate, release in the hippocampus without affecting basal release or the SV2A expression level in GABAergic neurons. In addition, the Sv2a(L174Q) mutation selectively reduced the synaptotagmin1 (Syt1) level among the exocytosis-related proteins examined. The present results demonstrate that dysfunction of SV2A due to the Sv2a(L174Q) mutation impairs the synaptic GABA release by reducing the Syt1 level and facilitates the kindling development, illustrating the crucial role of SV2A-GABA system in modulating kindling epileptogenesis.

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RGD Object Information
RGD ID: 12792961
Created: 2017-03-16
Species: All species
Last Modified: 2017-03-16
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.