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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/22203

    標題: Isoobtusilactone A induces cell cycle arrest and apoptosis through reactive oxygen species /apoptosis signal-regulating kinase 1 signaling pathway in human breast cancer cells.
    作者: Po-Lin Kuo1
    Chung-Yi Chen
    Ya-Ling Hsu2
    貢獻者: 生物科技系
    日期: 2007-08
    上傳時間: 2010-01-12 09:13:09 (UTC+8)
    出版者: Amer Assoc Cancer Research
    摘要: This study is the first to investigate the anticancer effect of isoobtusilactone A (IOA) in two human breast cancer cell lines, MCF-7 and MDA-MB-231. IOA exhibited effective cell growth inhibition by inducing cancer cells to undergo G2-M phase arrest and apoptosis. Further investigation revealed that IOA's inhibition of cell growth was also evident in a nude mice model. Cell cycle blockade was associated with increased levels of p21 and reduced amounts of cyclin B1, cyclin A, cdc2, and cdc25C. IOA also enhanced the levels of inactivated phosphorylated cdc2 and cdc25C. IOA triggered the mitochondrial apoptotic pathway, as indicated by a change in Bax/Bcl-2 ratios, resulting in mitochondrial membrane potential loss, cytochrome c release, and caspase-9 activation. We also found that the generation of reactive oxygen species (ROS) is a critical mediator in IOA-induced cell growth inhibition. Enhancement of ROS by IOA activated apoptosis signal-regulating kinase 1 (ASK1) resulted in the increased activation of c-Jun NH2-terminal kinase and p38. Antioxidants EUK8 and N-acetyl cystenine significantly decreased apoptosis by inhibiting the ASK1 dephosphorylation at Ser967 and subsequently increased the interaction of ASK1 with thioredoxin or 14-3-3 proteins. Moreover, blocking ASK1 by small interfering RNA inhibition completely suppressed IOA-induced apoptosis. Taken together, these results imply a critical role for ROS and ASK1 in IOA's anticancer activity.
    關聯: Cancer research 68(15): p.7406-7420
    Appears in Collections:[生物科技系(所)] 期刊論文

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