Abstract
To investigate the relationship between the inhibitory effects of ginseng saponins (ginsenosides) on acetylcholine-evoked secretion of catecholamines and the structures of ginsenosides, we examined the effects of ginsenoside-Rg3 and -Rh2, which are panaxadiol saponins, 20(R)- and 20(S)-ginsenoside-Rg2, which are epimers involving the hydroxyl group at C-20 of sapogenin, and other plant saponins on the acetylcholine-evoked secretion of catecholamines from cultured bovine adrenal chromaffin cells. The ginsenoside-Rg3 (1-100 microM) and -Rh2 (10-100 microM) greatly reduced the acetylcholine-evoked secretion in a concentration-dependent manner comparable to that of ginsenoside-Rg2, a panaxatriol saponin, which was the most potent inhibitor in our previous study. 20(R)- and 20(S)-ginsenoside-Rg2 (1-100 microM) similarly reduced the acetylcholine-evoked secretion. In contrast, saikosaponin-a, glycyrrhizin and the cardiac glycosides (100 nM-100 microM), digitoxin and digoxin, had no significant inhibitory effect on catecholamine secretion. Saikosaponin-c (10-100 microM), however, had an inhibitory effect, which was less than that of ginsenoside-Rg2 and -Rg3. These results strongly suggest that the inhibitory effects of ginsenosides on...Continue Reading
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