Anti-Inflammatory and Anti-Tumor-Promoting Effects of Triterpene Acids and Sterols from the Fungus Ganoderma lucidum

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Abstract

A series of lanostane-type triterpene acids, including eleven lucidenic acids (3, 4, 9, 10, 1319) and six ganoderic acids (2022, 24, 26, 27), as well as six sterols (2833), all isolated from the fruiting bodies of the fungus Ganoderma lucidum, were examined for their inhibitory effects on the induction of Epstein–Barr virus early antigen (EBV-EA) by 12-O-tetradecanoylphorbol-13-acetate (TPA) in Raji cells, a known primary screening test for anti-tumor promoters. All of the compounds tested, except for ganolactone (27) and three sterols (2931), showed potent inhibitory effects on EBV-EA induction, with IC50 values of 235–370 mol ratio/32 pmol TPA. In addition, nine lucidenic acids (1, 2, 58, 11, 12, 18) and four ganoderic acids (20, 2325) were found to inhibit TPA-induced inflammation (1 μg/ear) in mice, with ID50 values of 0.07–0.39 mg per ear. Further, 20-hydroxylucidenic acid N (18) exhibited inhibitory effects on skin-tumor promotion in an in vivo two-stage mouse-skin carcinogenesis test based on 7,12-dimethylbenz[a]anthracene (DMBA) as initiator, and with TPA as promoter.

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