Role of VAMP-2, VAMP-7, and VAMP-8 in constitutive exocytosis from HSY cells

Yohei Oishi, Toshiya Arakawa, Akihiko Tanimura, Makoto Itakura, Masami Takahashi, Yoshifumi Tajima, Itaru Mizoguchi, Taishin Takuma

研究成果: Article査読

17 被引用数 (Scopus)


We evaluated the role of VAMP-2/synaptobrevin, VAMP-7/TI-VAMP, and VAMP-8/endobrevin in exocytic pathways of HSY cells, a human parotid epithelial cell line, by coexpressing these VAMP proteins tagged with green fluorescent protein (GFP) and human growth hormone (hGH) as a secretory cargo. Exocytosis of hGH was constitutive and the fluorescent signal of hGH-GFP was observed in the Golgi area and small vesicles quickly moving throughout the cytoplasm. The cytoplasmic vesicles containing hGH overlapped well with VAMP-7-GFP, but did so scarcely with VAMP-2-GFP or VAMP-8-GFP. However, when the vesicle transport from the trans-Golgi network to the plasma membrane was arrested by incubation at 20°C for 2 h and then released by warming up to 37°C; VAMP-2-GFP and hGH were clearly colocalized together in small cytoplasmic vesicles. Neither VAMP-7-GFP nor hGH-GFP was colocalized with LAMP-1, a marker for lysosomes and late endosomes. These results suggest that (1) VAMP-2 can be one of the v-SNAREs for constitutive exocytosis; (2) VAMP-7 is involved in the constitutive exocytosis as a slow, minor v-SNARE, but not in the lysosomal transport; and (3) VAMP-8 is unlikely to be a v-SNARE for constitutive exocytosis in HSY cells.

ジャーナルHistochemistry and Cell Biology
出版ステータスPublished - 2006 3月

ASJC Scopus subject areas

  • 組織学
  • 分子生物学
  • 医療検査技術
  • 細胞生物学


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