Effect of norepinephrine on rat basilar artery in vivo

T. Kitazono, F. M. Faraci, D. D. Heistad

研究成果: Contribution to journalArticle査読

68 被引用数 (Scopus)

抄録

In anesthetized rats, we used a cranial window to examine effects of topical norepinephrine on diameter of the basilar artery in vivo. Topical application of norepinephrine increased the diameter of the basilar artery. N(G)-nitro-L-arginine methyl ester, an inhibitor of nitric oxide synthase, inhibited vasodilatation to acetylcholine but did not attenuate dilator responses to norepinephrine. Indomethacin also did not attenuate vasodilatation in response to norepinephrine. Dilatation of the basilar artery to norepinephrine was inhibited by propranolol and the β1-antagonist atenolol but not by the β2-antagonist butoxamine. Thus dilatation of the basilar artery in response to norepinephrine is produced by activation of β1-receptors and is not mediated by endothelium-derived relaxing factor or prostanoids. Glibenclamide, a selective inhibitor of ATP-sensitive K+ channels, partially inhibited vasodilatation in response to norepinephrine. Forskolin, a direct activator of adenylate cyclase, also increased the diameter of the basilar artery, and glibenclamide attenuated the dilatation. Thus dilatation of rat basilar artery in response to norepinephrine is mediated, in part, by activation of ATP-sensitive K+ channels, and activation of these K+ channels may be achieved by an adenosine 3',5'- cyclic monophosphate-dependent mechanism.

本文言語英語
ページ(範囲)H178-H182
ジャーナルAmerican Journal of Physiology - Heart and Circulatory Physiology
264
1 33-1
DOI
出版ステータス出版済み - 1993
外部発表はい

All Science Journal Classification (ASJC) codes

  • 生理学
  • 循環器および心血管医学
  • 生理学(医学)

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