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Protopanaxadiol and protopanaxatriol bind to glucocorticoid and oestrogen receptors in endothelial cells
Author(s) -
Leung Kar Wah,
Leung Fung Ping,
Mak Nai Ki,
TombranTink Joyce,
Huang Yu,
Wong Ricky NS
Publication year - 2009
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/j.1476-5381.2008.00066.x
Subject(s) - protopanaxadiol , enos , glucocorticoid receptor , receptor , ginsenoside , extracellular , medicine , endocrinology , chemistry , umbilical vein , pharmacology , nitric oxide , biology , nitric oxide synthase , biochemistry , ginseng , alternative medicine , pathology , in vitro
Background and purpose: Ginsenosides are used widely for medicinal purposes, but the mechanisms of their action are still unclear, although there is some evidence that these effects are mediated by nuclear receptors. Here we examined whether two metabolites of ginsenoside, protopanaxadiol (g‐PPD) and protopanaxatriol (g‐PPT), could modulate endothelial cell functions through the glucocorticoid receptor (GR) and oestrogen receptor (ER). Experiment approaches: The effects of g‐PPD and g‐PPT on intracellular calcium ion concentration ([Ca 2+ ] i ) and nitric oxide (NO) production in human umbilical vein endothelial cells (HUVECs) were measured using Fura‐2‐acetoxymethyl ester, 4‐amino‐5‐methylamino‐2′,7′‐difluorofluorescein and Griess reagent. Effects on expression of GR and ER isoforms in HUVECs were determined using reverse transcriptase‐/real‐time PCR and immunocytochemistry. Phosphorylation of endothelial NO synthase (eNOS) was assessed by Western blotting. Results: Ginsenoside protopanaxadiol and g‐PPT increased [Ca 2+ ] i , eNOS phosphorylation and NO production in HUVECs, which were inhibited by the GR antagonist, RU486, the ER antagonist, ICI 182,780 and siRNA targeting GR or ERβ. The NO production was Ca 2+ ‐dependent and the [Ca 2+ ] i elevation in HUVECs resulted from both intracellular Ca 2+ release and extracellular Ca 2+ influx. Conclusions and implications: Ginsenoside protopanaxadiol and g‐PPT were functional ligands for both GR and ERβ, through which these ginsenoside metabolites exerted rapid, non‐genomic effects on endothelial cells. Mandarin translation of abstract