Takuma T, Shitara A, Arakawa T, Okayama M, Mizoguchi I, Tajima Y. Isoproterenol stimulates transient SNAP23-VAMP2 interaction in rat parotid glands.
FEBS Lett 2013;
587:583-9. [PMID:
23380067 DOI:
10.1016/j.febslet.2013.01.039]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 01/10/2013] [Accepted: 01/20/2013] [Indexed: 10/27/2022]
Abstract
The exocytosis of salivary proteins is mainly regulated by cAMP, although soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs), which mediate cAMP-dependent exocytic membrane fusion, have remained unidentified. Here we examined the effect of isoproterenol (ISO) and cytochalasin D (CyD) on the level of SNARE complexes in rat parotid glands. When SNARE complexes were immunoprecipitated by anti-SNAP23, the coprecipitation of VAMP2 was significantly increased in response to ISO and/or CyD, although the coprecipitation of VAMP8 or syntaxin 4 was scarcely augmented. These results suggest that the SNAP23-VAMP2 interaction plays a key role in cAMP-mediated exocytosis from parotid glands.
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