We investigated the response of human cervix adenocarcinoma HeLa cells to Corosolic acid (CRA) treatment. Our results showed that CRA significantly inhibited cell viability in both a dose- and a time-dependent manner. CRA treatment induced S cell-cycle arrest and caused apoptotic death in HeLa cells. We found that CRA increased in Bax/Bcl-2 ratios by up-regulating Bax expression, disrupted mitochondrial membrane potential and triggered the release of cytochrome c from mitochondria into the cytoplasm. Moreover, CRA treatment triggered the activation of caspase-8. -9 and -3 in HeLa cells. All these results indicate that CRA-induced apoptosis is associated with the activation of caspases via a mitochondrial pathway. Taken together, we believe that CRA could have strong potentials for clinical application in treating human cervix adenocarcinoma and improving cancer chemotherapy
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