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RNA interference-mediated silencing of synaptotagmin IX, but not synaptotagmin I, inhibits dense-core vesicle exocytosis in PC12 cells.

Authors: Fukuda, M 
Citation: Fukuda M Biochem J. 2004 Jun 15;380(Pt 3):875-9.
Pubmed: (View Article at PubMed) PMID:15015935
DOI: Full-text: DOI:10.1042/BJ20040096

Although PC12 cells express three synaptotagmin isoforms (Syts I, IV and IX), all of which have been proposed to regulate dense-core vesicle exocytosis, it remains unknown which of the Sytisoforms acts as the major Ca2+ sensor for dense-core vesicle exocytosis. In the present study, it has been shown by immunoaffinity purification and immunocytochemistry that Syts I and IX, but not Syt IV, are present on the same secretory vesicles in PC12 cells. Silencing of Syt IX with specific small interfering RNA significantly reduced high KCl-dependent neuropeptide Y secretion from PC12 cells, whereas silencing of Syt I with specific small interfering RNA had no significant effect. The results indicate that Syts I and IX are not functionally equivalent and that Syt IX, and not Syt I, is indispensable for the regulation of Ca2+-dependent dense-core vesicle exocytosis in PC12 cells.

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CRRD Object Information
CRRD ID: 7241274
Created: 2013-03-07
Species: All species
Last Modified: 2013-03-07
Status: ACTIVE



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