Comparison of vascular responses of isolated, perfused simian and canine coronary arteries to adrenergic agonists.
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概要
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The vascular responses of the isolated, perfused simian left circumflex coronary arteries to adrenergic agonists were compared to those of canine coronary arteries in isolated, perfused preparations. Norepinephrine and epinephrine produced only vasoconstriction in monkey arteries in contrast to vasoconstrictor, vasodilator and biphasic responses of canine coronary arteries. Isoproterenol induced a dose-dependent vasodilatation. Salbutamol, a selective beta2-agonist, produced either a slight vasodilatation or no response. Phenylephrine, a selective alpha1-agonist, usually caused a marked vasoconstriction in a dose-related manner in both preparations. Xylazine and clonidine, selective alpha2-agonists, caused a slight vasoconstriction in low doses, but these two agonists relaxed both preparations in high doses. These observations suggest that adrenoceptor subtypes may be mainly alpha-1 and beta-1 in the large coronary arteries of monkeys and dogs and that the alphaadrenoceptor is predominant in simian large coronary arteries.
- International Heart Journal刊行会の論文
著者
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Nakane Tokio
Department Of Pharmacology Shinshu University School Of Medicine
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Chiba Shigetoshi
Departmen T Of Pharmacology Shinshu University School Of Medicine
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Chiba Shigetoshi
Department of Pharmacology, Shinshu University School of Medicine
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