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Dev Cell. 2004 Sep;7(3):359-71.

A role of VAMP8/endobrevin in regulated exocytosis of pancreatic acinar cells.

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1
Membrane Biology Laboratory, Institute of Molecular and Cell Biology, Proteos, 61 Biopolis Drive, Singapore 138673, Singapore.

Abstract

Despite our general understanding that members of the SNARE superfamily participate in diverse intracellular docking/fusion events, the physiological role of the majority of SNAREs in the intact organism remains elusive. In this study, through targeted gene knockout in mice, we establish that VAMP8/endobrevin is a major player in regulated exocytosis of the exocrine pancreas. VAMP8 is enriched on the membrane of zymogen granules and exists in a complex with syntaxin 4 and SNAP-23. VAMP8-/- mice developed normally but showed severe defects in the pancreas. VAMP8 null acinar cells contained three times more zymogen granules than control acinar cells. Furthermore, secretagogue-stimulated secretion was abolished in pancreatic fragments derived from VAMP8-/- mice. In addition, VAMP8-/- mice were partially resistant to supramaximal caerulein-induced pancreatitis. These results suggest a major physiological role of VAMP8 in regulated exocytosis of pancreatic acinar cells by serving as a v-SNARE of zymogen granules.

PMID:
15363411
DOI:
10.1016/j.devcel.2004.08.002
[Indexed for MEDLINE]
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