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Silence of Synaptotagmin VII inhibits release of dense core vesicles in PC12 cells.

Authors: Li, J  Xiao, Y  Zhou, W  Wu, Z  Zhang, R  Xu, T 
Citation: Li J, etal., Sci China C Life Sci. 2009 Dec;52(12):1156-63. doi: 10.1007/s11427-009-0160-y. Epub 2009 Dec 17.
Pubmed: (View Article at PubMed) PMID:20016973
DOI: Full-text: DOI:10.1007/s11427-009-0160-y

Synaptotagmin VII (Syt VII), which has a higher Ca(2+) affinity and slower disassembly kinetics with lipid than Syt I and Syt IX, was regarded as being uninvolved in synaptic vesicle (SV) exocytosis but instead possibly as a calcium sensor for the slower kinetic phase of dense core vesicles (DCVs) release. By using high temporal resolution capacitance and amperometry measurements, it was demonstrated that the knockdown of endogenous Syt VII attenuated the fusion of DCV with the plasma membrane, reduced the amplitude of the exocytotic burst of the Ca(2+)-triggered DCV release without affecting the slope of the sustained component, and blocked the fusion pore expansion. This suggests that Syt VII is the Ca(2+) sensor of DCV fusion machinery and is an essential factor for the establishment and maintenance of the pool size of releasable DCVs in PC12 cells.


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CRRD Object Information
CRRD ID: 7241272
Created: 2013-03-07
Species: All species
Last Modified: 2013-03-07
Status: ACTIVE


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