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Radicicol, an inhibitor of Hsp90, enhances TRAIL-induced apoptosis in human epithelial ovarian carcinoma cells by promoting activation of apoptosis-related proteins

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Abstract

Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) induces apoptosis in various cancer cells. Hsp90 is known to be involved in cell survival and growth in tumor cells. Nevertheless, Hsp90 inhibitors exhibit a variable effect on the cytotoxicity of anticancer drugs. Furthermore, the combined effect of Hsp90 inhibitors on TRAIL-induced apoptosis in epithelial ovarian cancer cells has not been determined. To assess the ability of an inhibitor of Hsp90 inhibitor radicicol to promote apoptosis, we investigated the effect of radicicol on TRAIL-induced apoptosis in the human epithelial ovarian carcinoma cell lines OVCAR-3 and SK-OV-3. TRAIL induced a decrease in Bid, Bcl-2, Bcl-xL, and survivin protein levels, increase in Bax levels, loss of the mitochondrial transmembrane potential, cytochrome c release, activation of caspases (-8, -9, and -3), cleavage of PARP-1 and an increase in the tumor suppressor p53 levels. Radicicol enhanced TRAIL-induced apoptosis-related protein activation, nuclear damage and cell death. These results suggest that radicicol may potentiate the apoptotic effect of TRAIL on ovarian carcinoma cell lines by increasing the activation of the caspase-8- and Bid-dependent pathway and the mitochondria-mediated apoptotic pathway, leading to caspase activation. Radicicol may confer a benefit in the TRAIL treatment of epithelial ovarian adenocarcinoma.

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Acknowledgment

This study was supported by a grant of the Korea Healthcare Technology R&D Project, Ministry for Health, Welfare & Family Affairs, Republic of Korea (A085138).

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Authors and Affiliations

  1. Department of Pharmacology, College of Medicine, Chung-Ang University, Seoul, 156-756, South Korea

    Yun Jeong Kim, Seon Ae Lee & Chung Soo Lee

  2. Department of Urology, Chung-Ang University Hospital, Seoul, 156-755, South Korea

    Soon Chul Myung

  3. Department of Microbiology, College of Medicine, Chung-Ang University, Seoul, 156-756, South Korea

    Wonyong Kim

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  1. Yun Jeong Kim
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Correspondence to Chung Soo Lee.

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Kim, Y.J., Lee, S.A., Myung, S.C. et al. Radicicol, an inhibitor of Hsp90, enhances TRAIL-induced apoptosis in human epithelial ovarian carcinoma cells by promoting activation of apoptosis-related proteins. Mol Cell Biochem 359, 33–43 (2012). https://doi.org/10.1007/s11010-011-0997-9

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