18beta-Glycyrrhetinic acid induces apoptotic cell death in SiHa cells and exhibits a synergistic effect against antibiotic anti-cancer drug toxicity

Life Sciences
Chung Soo LeeSun Joo Lee

Abstract

Defects in mitochondrial function have been shown to participate in the induction of cell death in cancer cells. The present study was designed to assess the toxic effect of 18beta-glycyrrhetinic acid against human cervix and uterus tumor cell line SiHa cells in relation to the mitochondria-mediated cell-death process and evaluate the combined toxic effect of 18beta-glycyrrhetinic acid and anti-cancer drugs. 18beta-Glycyrrhetinic acid induced the nuclear damage, changes in the mitochondrial membrane permeability, formation of reactive oxygen species and depletion of glutathione in SiHa cells. It caused cell death by inducing the increase in the pro-apoptotic Bax protein and cytochrome c levels, reduction in anti-apoptotic Bcl-2 level, subsequent caspase-3 activation and loss of the mitochondrial transmembrane potential. Unlike 18beta-glycyrrhetinic acid, a pro-compound glycyrrhizin up to 100 microM did not induce cell death and depletion of glutathione. Combined treatment of mitomycin c (or doxorubicin) and 18beta-glycyrrhetinic acid revealed a synergistic toxic effect. Meanwhile, combination of camptothecin and 18beta-glycyrrhetinic acid exhibited an additive cytotoxic effect. Results suggest that 18beta-glycyrrhetinic acid ma...Continue Reading

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