Cucurbitane glycosides from the fruits of Siraitia grosvenorii and their inhibitory effects on Epstein-Barr virus activation

Abstract

Six new cucurbitane glycosides, mogroside II B (2), 11-deoxymogroside III (4), 7-oxomogroside II E (5), 7-oxomogroside V (6), 11-oxomogroside II A 1 (7), and 11-oxomogroside IV A (8), and two known but new naturally occurring cucurbitane glycosides, mogroside II A1 (1) and mogroside III A2 (3), were isolated from an ethanol extract of the fruits of Siraitia grosvenorii. Upon evaluation of compounds 1-8 for inhibitory effects against the Epstein-Barr virus early antigen (EBV-EA) activation induced by 12-O-tetradecanoylphorbol-13-acetate (TPA), all compounds exhibited inhibitory effects with IC50 values of 346-400 mol ratio/32 pmol TPA. In addition, compounds 1-8 showed weak inhibitory effects on activation of (±)-(E)-methyl-2-[(E)-hydroxyimino]-5-nitro-6-methoxy-3-hexemide (NOR 1), a nitric oxide (NO) donor. © 2007 American Chemical Society and American Society of Pharmacognosy.