The inhibitory effects of ginsenosides on protein tyrosine kinase activated by hypoxia/reoxygenation in cultured human umbilical vein endothelial cells.
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.
Department of Natural Products Chemistry, Shenyang Pharmaceutical University, China. doudeqiang@yahoo.com
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Dou
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Zhang
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Chen
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Yao
D015687:Cell Hypoxia; D002478:Cells, Cultured; D004730:Endothelium, Vascular / Q000166:cytology / Q000187:drug effects* / Q000201:enzymology; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D036145:Ginsenosides; D006801:Humans; D010100:Oxygen / Q000378:metabolism*; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors*; D012503:Saponins / Q000494:pharmacology*; D014471:Umbilical Veins / Q000166:cytology / Q000187:drug effects / Q000201:enzymology
D004791:Enzyme Inhibitors; D036145:Ginsenosides; D012503:Saponins; D011505:Protein-Tyrosine Kinases; D010100:Oxygen