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Lanostane Triterpenes from the Tibetan Medicinal Mushroom Ganoderma leucocontextum and Their Inhibitory Effects on HMG-CoA Reductase and α-Glucosidase
- Wang, Kai, Bao, Li, Xiong, Weiping, Ma, Ke, Han, Junjie, Wang, Wenzhao, Yin, Wenbing, Liu, Hongwei
- Journal of natural products 2015 v.78 no.8 pp. 1977-1989
- Ganoderma lucidum, alpha-glucosidase, cytotoxicity, fruiting bodies, hydroxymethylglutaryl-CoA reductases, inhibitory concentration 50, medicinal fungi, paclitaxel, secondary metabolites, spectral analysis, triterpenoids, yeasts
- Sixteen new lanostane triterpenes, ganoleucoins A–P (1–16), together with 10 known tripterpenes (17–26), were isolated from the cultivated fruiting bodies of Ganoderma leucocontextum, a new member of the Ganoderma lucidum complex. The structures of the new compounds were elucidated by extensive spectroscopic analysis and chemical transformation. The inhibitory effects of 1–26 on HMG-CoA reductase and α-glucosidase were tested in vitro. Compounds 1, 3, 6, 10–14, 17, 18, 23, 25, and 26 showed much stronger inhibitory activity against HMG-CoA reductase than the positive control atorvastatin. Compounds 13, 14, and 16 presented potent inhibitory activity against α-glucosidase from yeast with IC₅₀ values of 13.6, 2.5, and 5.9 μM, respectively. In addition, the cytotoxicity of 1–26 was evaluated against the K562 and PC-3 cell lines by the MTT assay. Compounds 1, 2, 6, 7, 10, 12, 16, 18, and 25 exhibited cytotoxicity against K562 cells with IC₅₀ values in the range 10–20 μM. Paclitaxel was used as the positive control with an IC₅₀ value of 0.9 μM. This is the first report of secondary metabolites from this medicinal mushroom.