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Tripchlorolide (TC) is a potent antitumor reagent purified from a Chinese herb Tripterygium Wilfordii Hook. f.. However, its cellular effects and mechanism of action are unknown. We showed here that TC induced apoptosis of Chinese Hamster Ovary (CHO) cells in time- and dose-dependent manners. TC resulted in the degradation of Bcl-2, the translocation of Bax from the cytosol to mitochondria, and the release of cytochrome c from mitochondria. Stable overexpression of human Bcl-2 could reduce the apoptosis of TC-treated cells by blocking the translocation of Bax and the release of cytochrome c. These results indicate that TC induces apoptosis of CHO cell by activating the mitochondrion-mediated apoptotic pathway involving the proteins of Bcl-2 family and cytochrome c.

Induction of mitochondrion-mediated apoptosis of CHO cells by tripchloro- lide