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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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    An antiapoptotic Bcl-2 family protein index predicts the response of leukaemic cells to the pan-Bcl-2 inhibitor S1

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    论文类型:期刊论文

    发表时间:2013-05-14

    发表刊物:BRITISH JOURNAL OF CANCER

    收录刊物:SCIE、PubMed、Scopus

    卷号:108

    期号:9

    页面范围:1870-1878

    ISSN号:0007-0920

    关键字:Bcl-2 phosphorylation; S1; BH3 mimetics; antileukaemic

    摘要:Background: Bcl-2-like members have been found to be inherently overexpressed in many types of haematologic malignancies. The small-molecule S1 is a BH3 mimetic and a triple inhibitor of Bcl-2, Mcl-1 and Bcl-XL.
       Methods: The lethal dose 50 (LD50) values of S1 in five leukaemic cell lines and 41 newly diagnosed leukaemia samples were tested. The levels of Bcl-2 family members and phosphorylated Bcl-2 were semiquantitatively measured by western blotting. The interactions between Bcl-2 family members were tested by co-immunoprecipitation. The correlation between the LD50 and expression levels of Bcl-2 family members, alone or in combination, was analysed.
       Results: S1 exhibited variable sensitivity with LD50 values ranging >2 logs in both established and primary leukaemic cells. The ratio of pBcl-2/(Bcl-2 + Mcl-1) could predict the S1 response. Furthermore, we demonstrated that pBcl-2 antagonised S1 by sequestering the Bak and Bim proteins that were released from Mcl-1, andpBcl-2/Bak, pBcl-2/Bax and pBcl-2/Bim complexes cannot be disrupted by S1.
       Conclusion: A predictive index was obtained for the novel BH3 mimetic S1. The shift of proapoptotic proteins from being complexed with Mcl-1 to being complexed with pBcl-2 was revealed for the first time, which is the mechanism underlying the index value described herein.