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Biochem Pharmacol. 2005 Nov 1;70(9):1298-308.

A novel LXR-alpha activator identified from the natural product Gynostemma pentaphyllum.

Author information

1
Pharmaceutical Chemistry, Herbal Medicines Research and Education Centre, Faculty of Pharmacy, A15, S322, University of Sydney, NSW 2006, Australia.

Abstract

Liver X receptors (LXR) play an important role in cholesterol homeostasis by serving as regulatory sensors of cholesterol levels in tissues. The present study reports a novel LXR-alpha activator, (20S)-2alpha, 3beta, 12beta, 24(S)-pentahydroxydammar-25-ene 20-O-beta-d-glucopyranoside (TR1), a dammarane-type gynosaponin, isolated from the herbal medicine, Gynostemma pentaphyllum. Gynosaponin TR1 demonstrated greater selectivity toward activation of the LXR-alpha isoform than LXR-beta in HEK293 cells. TR1 selectively enhanced LXR-mediated transcriptional activation and protein expression of ABCA1 and apoE gene expression and secretion in THP-1-derived macrophages. The selectivity of TR1 for LXR-alpha was consistent with ligand docking studies, which showed favourable interaction of TR1 in the LXR-alpha-binding domain, whereas the presence of the sugar substituent interfered with binding to the LXR-beta site. Findings from the present study may provide insight into the development of pharmaceutical agents for treating atherosclerosis.

PMID:
16154115
DOI:
10.1016/j.bcp.2005.07.033
[Indexed for MEDLINE]

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