オオノ　ヒデキ   大野　秀樹    所属   医学部 医学科（附属足立医療センター）    職種   講師
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Involvement of syntaxin 7 in human gastric epithelial cell vacuolation induced by the Helicobacter pylori-produced cytotoxin VacA
掲載誌名	正式名：J Biol Chem ISSNコード：0021-9258 (Print) 0021-9258 (Linking)
掲載区分	国外
巻・号・頁	278,pp.25585-25590
著者・共著者	Suzuki, J Ohnishi, H Wada, A Hirayama, T Ohno, H Ueda, N Yasuda, H Iiri, T Wada, Y Futai, M Mashima, H
発行年月	2003
概要	The Helicobacter pylori-produced cytotoxin VacA induces intracellular vacuolation. The formed vacuole is assumed to be a hybrid of late endosome and lysosome. To elucidate the molecular mechanism of VacA-induced vacuolation, we examined the participation of syntaxin 7 in the human gastric epithelial cell line AGS. Immunocytochemistry revealed that endogenous syntaxin 7 was localized to vacuoles induced by VacA. Northern and Western blotting demonstrated that VacA intoxication increased syntaxin 7 mRNA and protein expression, respectively, in a time-dependent manner. Transient transfection of dominant-negative mutant syntaxin 7, which lacks a carboxyl-terminal transmembrane domain, inhibited VacA-induced vacuolation. In contrast, transient transfection of wild-type syntaxin 7, dominant-negative mutant syntaxin 1a, or dominant-negative mutant syntaxin 4 did not alter VacA-induced vacuolation. Furthermore, under VacA treatment, neutral red dye uptake, a parameter of VacA-induced vacuolation, was inhibited in cells stably transfected with mutant syntaxin 7 but not in cells stably transfected with wild-type syntaxin 7, mutant syntaxin 1a, or mutant syntaxin 4. Sequential immunocytochemical observation confirmed that expression of mutant syntaxin 7 did not affect VacA attachment to or internalization into AGS cells. We suggest that syntaxin 7 is involved in the intracellular vacuolation induced by VacA.
DOI	10.1074/jbc.M212445200
文献番号	12730232