The Inhibitory Effects of Ginsenosides on Protein Tyrosine Kinase Activated by Hypoxia/Reoxygenation in Cultured Human Umbilical Vein Endothelial Cells

Abstract

27 individual ginsenosides and aglycones, together with five extracts from ginseng roots, ginseng leaves, American ginseng roots, American ginseng leaves and non-saponin fraction from roots of Panax ginseng, were tested for their effects on protein tyrosine kinase (PTK) activation induced by an in vitro hypoxia/reoxygenation (H/R) model in cultured human umbilical vein endothelial cells (HUVEC). The results indicated that ginsenoside-Rb₁ (3), -Rd (7), -Ra₁ (1) and -Ro (27) showed significant inhibitory effects on PTK activation induced by H/R. Dose-response experiments revealed that ginsenoside-Rb₁ was the most active compound and it completely blocked PTK activation at a wide range of concentrations. Most protopanaxadiol-type ginsenosides and some protopanaxatriol-type saponins also showed significant effects on PTK activation. However, the crude extracts did not protect against H/R-induced PTK activation.

Key words

Panax ginseng - C. A. Meyer - Araliaceae - ginsenosides - hypoxia/reoxygenation - protein tyrosine kinase - tyrosine phosphorylated proteins

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