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- W2067204517 abstract "The present study was designed to investigate the relaxant effect of isopropyl 3-(3, 4-dihydroxyphenyl)-2-hydroxypropanoate (IDHP), a new metabolite from Salvia miltiorrhiza, on rat mesenteric artery. Isolated mesenteric arterial rings were mounted in organ baths and the isometric tension changes were measured continuously by a sensitive myograph system. The results showed that IDHP at concentrations greater than 0.1 nM produced a concentration-dependent relaxation of artery contracted by norepinephrine with pEC(50) of 7.41+/-0.08. Removal of the endothelium did not affect this relaxation, suggesting that IDHP exerted a direct effect on vascular smooth muscle cells. Meanwhile, the vasorelaxant effect of IDHP was unaffected by pre-treatment with ATP-sensitive K(+) channel inhibitor glibenclamide, delayed rectifier K(+) channel inhibitor 4-aminopyridine, inwardly rectifying K(+) channel inhibitor barium chloride and beta-adrenoceptor antagonist propranolol. However, the non-specific K(+) channel inhibitor tetraethylammonium (TEA, 3 mM) produced a rightward shift of 1.8 fold on the concentration-response curve of IDHP. Moreover, IDHP shifted the concentration-response curve of CaCl(2) as well as two receptor-mediated constrictors, phenylephrine and 5-hydroxytryptamine, to the right in a non-parallel manner. In the absence of extracellular Ca(2+), IDHP depressed the contractions induced by norepinephrine and CaCl(2), and the maximal inhibitions were 48.3+/-18.9% and 58.4+/-10.9%, respectively. These results suggest that IDHP exerts a vasorelaxant effect by inhibiting both Ca(2+) release from intracellular stores and Ca(2+) influx through voltage-dependent calcium channels, and receptor-operated calcium channels in vascular smooth muscle cells. In addition, activation of vascular TEA-sensitive K(+) channels may be partially involved in the relaxant effect of IDHP." @default.
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- W2067204517 date "2008-01-01" @default.
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- W2067204517 title "Vasorelaxant effect of isopropyl 3-(3, 4-dihydroxyphenyl)-2-hydroxypropanoate, a novel metabolite from Salvia miltiorrhiza, on isolated rat mesenteric artery" @default.
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- W2067204517 doi "https://doi.org/10.1016/j.ejphar.2007.10.009" @default.
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