Effect of norepinephrine on rat basilar artery in vivo

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

研究成果: ジャーナルへの寄稿記事

67 引用 (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.

元の言語英語
ページ(範囲)H178-H182
ジャーナルAmerican Journal of Physiology - Heart and Circulatory Physiology
264
発行部数1 33-1
出版物ステータス出版済み - 2 24 1993
外部発表Yes

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Basilar Artery
Norepinephrine
Dilatation
Vasodilation
Glyburide
Butoxamine
Adenosine Triphosphate
Endothelium-Dependent Relaxing Factors
Atenolol
NG-Nitroarginine Methyl Ester
Colforsin
Adenylyl Cyclases
Propranolol
Nitric Oxide Synthase
Indomethacin
Cyclic AMP
Acetylcholine
Prostaglandins

All Science Journal Classification (ASJC) codes

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

これを引用

Effect of norepinephrine on rat basilar artery in vivo. / Kitazono, T.; Faraci, F. M.; Heistad, D. D.

:: American Journal of Physiology - Heart and Circulatory Physiology, 巻 264, 番号 1 33-1, 24.02.1993, p. H178-H182.

研究成果: ジャーナルへの寄稿記事

Kitazono, T. ; Faraci, F. M. ; Heistad, D. D. / Effect of norepinephrine on rat basilar artery in vivo. :: American Journal of Physiology - Heart and Circulatory Physiology. 1993 ; 巻 264, 番号 1 33-1. pp. H178-H182.
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AB - 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.

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