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Ganoderma resinaceum Boud. (Polyporeseae) has long been used for antioxidant, immunoregulation and liver protection. From the fruiting bodies of G. resinaceum, eight new lanostanoids, lucidones D-G (1-4), 7-oxo-ganoderic acid Z2 (5), 7-oxo-ganoderic acid Z3 (6), ganoderesin A (7), and ganoderesin B (8), together with six known lanostanoids (9-14) were isolated. The structures of new compounds were elucidated through extensive spectroscopic analysis. In an in vitro model, ganoderesin B (8), ganoderol B (10) and lucidone A (11) showed inhibitory effects against the increase of ALT and AST levels in HepG2 cells induced by H2O2 compared to a control group in the range of their maximum non-toxic concentration (MNTC). However, compounds 8, 10 and 11 displayed no anti-oxidant activities by DPPH assay. Meanwhile, activation for PXR (Pregnane X Receptor) of ganoderesin B (8), ganoderol B (10) and lucidone A (11) was evaluated; ganoderol (10) exhibited a vital activation for PXR-induced CYP3A4 expression. These results suggested that GTs (Ganoderma triterpenoids) exhibited hepatoprotective activities by lowering ALT and AST levels.
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| http://dx.doi.org/10.1016/j.foodchem.2013.03.071 | DOI Listing |
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