Differences in Adrenergic Nerve and Receptor Function in Dog Internal Thoracic, Coronary and Mesenteric Arteries

The Japanese Journal of Pharmacology

Atsumi Mori²  Noboru Toda¹  Tomio Okamura¹  Shoichiro Shiraishi¹ 

[1] Department of Pharmacology, Shiga University of Medical Science;Second Department of Surgery, Shiga University of Medical Science

关键词: Internal thoracic artery;    Adrenergic function;    Immunohistochemistry;    β-Adrenoceptor binding;   

DOI  :  10.1254/jjp.66.481

学科分类：药理学

来源: Nihon Yakuri Gakkai Henshuubu / Japanese Pharmacological Society

【 摘 要 】

References(23)Cited-By(1)Isolated dog internal thoracic arteries (ITA) responded to norepinephrine and phenylephrine with concentration-related contractions, which were suppressed by prazosin, but not by yohimbine. Clonidine did not contract ITA. In coronary arterial strips, norepinephrine produced a relaxation. Isoproterenol relaxed coronary arterial strips contracted with serotonin but did not alter the tone of ITA. Forskolin and beraprost, an analog of prostaglandin I2, relaxed coronary and ITA strips to a similar extent. The β-adrenoceptor density, assayed by [3H]dihydroalprenolol binding, was markedly less in ITA than in coronary arteries. Nicotine and transmural electrical stimulation did not alter the tension of ITA. Immunohistochemical study indicated that nerve fibers containing tyrosine hydroxylase immunoreactivity were markedly less in ITA than in coronary and mescnteric arteries. These results indicate that β-adrenoceptor function and adrenergic innervation are considerably reduced in dog ITA. Norepinephrine-induced vasocontraction appears to be mediated by α1-adrenoceptors in the arteries.

【 授权许可】

Unknown