Endothelium-independent effects of PHYLLANTHIN (cas 10351-88-9) and hypoPHYLLANTHIN (cas 10351-88-9) on vascular tension
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Add time:08/03/2019 Source:sciencedirect.com
The purpose of this study was to investigate the modulating effects of PHYLLANTHIN (cas 10351-88-9) and hypophyllanthin on vascular tension, using in the in vitro model of isolated rat aorta. Our results indicated that both phyllanthin and hypophyllanthin significantly relaxed the sustained contraction induced by phenylephrine (PE) in a concentration-dependent manner. In addition, endothelial removal had no significant influence on the vasorelaxation responses of the aortic rings toward these two compounds. Furthermore, both compounds inhibited the contraction of aortic muscle provoked by either PE (1 μM) or KCl (40 mM) as well as the spontaneous contraction of the Ca2+-depleted muscle. In high K+- Ca2+ free solution, phyllanthin (100 μM), but not hypophyllanthin, significantly inhibited the contractile responses upon cumulative addition of CaCl2. Both compounds (100 μM) significantly inhibited PE-induced contraction in Ca2+-free condition, but could not affect caffeine-induced contraction. Taken together, phyllanthin and hypophyllanthin could modulate the vascular tension via the endothelium-independent mechanisms. The modulating effects of both compounds were possibly involved with the blockade of Ca2+ entry into vascular smooth muscle cells and inhibition of PE-mediated Ca2+ release from sarcoplasmic reticulum.
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