Clitocine induces apoptosis and enhances the lethality of ABT-737 in human colon cancer cells by disrupting the interaction of Mcl-1 and Bak
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AbstractABT-737 is a novel anti-apoptotic Bcl-2 family protein inhibitor with high affinity to Bcl-2, Bcl-xl and Bcl-w but relatively low affinity to Mcl-1/A1. Therefore, high level Mcl-1 usually confers human tumor cell resistance to ABT-737. At the present study, we observed that clitocine can induce apoptosis in six tested human colon cancer cell lines accompanied by suppression of Mcl-1. More interestingly, clitocine significantly enhances the ABT-737-mediated lethality by inducing apoptosis. At the molecular level we determined Mcl-1 is the potential target through which clitocine can sensitize human colon cancer cells to ABT-737 induced apoptosis. Knocking-down of Mcl-1 is sufficient to increase cancer cell susceptibility to ABT-737 while its over-expression can significantly reverse this susceptibility. We also determined that clitocine may activate Bak by disrupting the interaction between Mcl-1 and Bak to induce mitochondrial membrane permeabilization. Furthermore, silence of Bak with the specific siRNA effectively attenuates the apoptosis induction by co-treatment of clitocine and ABT-737. Finally, clitocine in combination with ABT-737 significantly suppress the xenograft growth in animal model. Collectively, our studies suggest clitocine can induce apoptosis and potentiate ABT-737 lethality in human colon cancer cells by disrupting the interaction of Mcl-1 and Bak to trigger apoptosis. (C) 2014 Elsevier Ireland Ltd. All rights reserved.
All Author(s) ListSun JG, Xiang J, Zeng XL, Li X, Wu P, Fung KP, Liu FY
Journal nameCancer Letters
Volume Number355
Issue Number2
Pages253 - 263
LanguagesEnglish-United Kingdom
KeywordsABT-737; Apoptosis; Bak; Clitocine; Mcl-1
Web of Science Subject CategoriesOncology

Last updated on 2021-02-05 at 01:14