Glycyrrhetinic acid (GA) and its related compounds are known to have anti-inflammatory activity and also to inhibit liver carcinogenesis and tumor growth. GA and related compounds inhibited cell proliferation of the human hepatoma cell line, HepG2. Among five compounds tested, ursolic acid and 18beta-olean-12-ene-3beta, 23, 28-triol (18beta-erythrotriol) were comparatively effective, where the 50% inhibitory dose was 20 microM and 25 microM, respectively. Flow-cytometric analysis showed that GA and the related compounds arrested the cell cycle in the G1-phase; in addition, GA-related compounds induced apoptosis at high dose. Western blot analysis indicated that the induction of apoptosis by GA and ursolic acid was accompanied with an activation of caspase-8 and a reduction in the anti-apoptotic proteins, Bcl-2 and Bcl-xL, although the pro-apoptotic proteins, Bax and Bak, remained unaffected. These results suggest that GA and its related compounds may be potent agents in liver cancer treatment.
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