@article{APS8172,
author = {Yu Huang and Xiao-Qiang Yao and Suk Ying Tsang and Chi-Wai Lau and Zhen-Yu Chen},
title = {Role of endothelium/nitric oxide in vascular response to flavonoids and epicatechin},
journal = {Acta Pharmacologica Sinica},
volume = {21},
number = {12},
year = {2016},
keywords = {},
abstract = {\"AIM:
To examine the role of endothelium in the vascular responses to flavonoids, baicalein, baicalin, cardamonin, alpinetin, and to purified jasmine green tea (-)epicatechin in the isolated rate mesenteric artery rings.
METHODS:
The isometric contraction was measured by Grass force-displacement transducers.
RESULTS:
Both baicalein and baicalin enhanced the phenylephrine-induced contractile response in the endothelium-intact rings. This enhancement was abolished by pretreatment with the nitric oxide inhibitor NG-nitro-L-arginine or in the absence of the endothelium. Both flavonoids also inhibited the acetylcholine-induced endothelial nitric oxide-dependent relaxation. In contrast, cardamonin, alpinetin or (-)epicatechin induced both endothelium-dependent and -independent relaxation. NG-nitro-L-arginine meyhyl ester or endothelium denudation attenuated the endothelium-dependent relaxation to the same extent.
CONCLUSION:
Baicalein and baicalin enhanced the phenylephrine-induced contraction most likely through inhibiting production or/and release of endothelial nitric oxide. Whilst, cardamonin-, alpinetin- or (-)epicatechin-induced endothelium-dependent relaxation is primarily mediated through endothelial nitric oxide.\"},
issn = {1745-7254}, url = {http://www.chinaphar.com/article/view/8172}
}