Isolation and characterization of dihydropyran-ring containing meroterpenoids from Ganoderma lucidum and their inhibitory activity against renal fibrosis-related protein expression

Abstract

The Ganoderma lucidum mushroom, which has been used as a traditional medicine in China for more than 2000 years, is a source of many interesting natural product. In this study, the five undescribed minor meroterpenoids baoslingzhines F–J (1−5), containing a dihydropyran moiety, were isolated as racemic mixtures from the fruiting bodies of G. lucidum. These substances were structurally and stereochemically characterized by using spectroscopic and computational methods. Chiral HPLC was employed to separate the (+)- and (−)-antipodes. A survey of the activities against kidney fibrosis showed that both enantiomers of baoslingzhines F–J inhibit expression of renal fibrosis-related proteins, including fibronectin, collagen I and ɑ-SMA in TGF-β1-induced rat kidney proximal tubular cells.