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    刘宇博

    • 教授     博士生导师   硕士生导师
    • 性别:男
    • 毕业院校:大连理工大学
    • 学位:博士
    • 所在单位:化工海洋与生命学院
    • 学科:生物化学与分子生物学. 生物化工. 化学生物学
    • 办公地点:大连理工大学 盘锦校区 生命与医药学院 F03-314
    • 联系方式:liuyubo@dlut.edu.cn
    • 电子邮箱:liuyubo@dlut.edu.cn

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    S1, a Novel Pan-BH3 Mimetic, Induces Apoptosis in Mcl-1-Overexpressing Cells Through Bak

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    论文类型:期刊论文

    发表时间:2012-08-01

    发表刊物:JOURNAL OF PHARMACOLOGICAL SCIENCES

    收录刊物:SCIE、PubMed、Scopus

    卷号:119

    期号:4

    页面范围:330-340

    ISSN号:1347-8613

    关键字:BH3 mimetic; Bcl-2/Mcl-1 dual inhibitor; Mcl-1 dynamics; Bax; Bak

    摘要:Mcl-1, an anti-apoptotic Bcl-2 homolog that has a structurally divergent BH3-binding pocket, non-redundant action model, and unique characteristic of short life confers complete resistance to the BH3 mimetic ABT-737. Herein, we used S1, previously identified as a Mcl-1/Bcl-2 dual inhibitor and a pure BH3 mimetic, to explore the mechanism of Mcl-1's action and supply a strategy to challenge Mcl-1's protection. Apoptosis assay in SMMC-7721, HCT116, and K562 cells demonstrated that SI can effectively challenge Mcl-1's anti-apoptotic effect. Notably, we discovered an unexpected dynamic change of Mcl-1 that directly correlates with resistance or commitment to apoptosis induced by both ABT-737 and Si. Co-immunoprecipitation assays demonstrated that Mcl-1 increase results from Bim trafficking from Bcl-2 to Mcl-1, while subsequent Bak released by S1 determines Mcl-1 decrease and full-blown apoptosis. Further experiments using Bak shRNA testified that Bak accounts for S1-induced apoptosis and Mcl-1 decrease. Consistently, Bax-deficient DU145 cells are sensitive to S1, whereas Bak-mutant MKN-28 cells are significantly more resistant. The in vitro model could be extended to an in vivo mouse xenograft model in which Mcl-1 confers resistance by increased protein level, and the release of Bak could serve as a biomarker of apoptosis. [Supplementary materials: available only at http://dx.doi.org/10.1254/jphs.12103FP]