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Vaninolol: a new selective beta 1-adrenoceptor antagonist derived from vanillin.

Abstract：

:The beta-adrenoceptor blocking properties of vaninolol ((+/-)4-[4'-(2-hydroxy-3-tert-butyl-aminopropoxy)-3'-methoxyphenyl]- 3-buten-2-one), derived from vanillin, were first investigated under in vivo and in vitro conditions. Vaninolol (0.1, 0.5, 1.0 mg/kg, i.v.), as well as propranolol, produced a dose-dependent bradycardia response and a sustained pressor action in urethane-anesthetized normotensive rats. Vaninolol inhibited the tachycardia effects induced by (-)isoproterenol, but had no blocking effect on the arterial pressor responses induced by phenylephrine. These findings suggested that vaninolol possessed beta-adrenergic blocking activity, but was without alpha-adrenergic blocking activity. In isolated guinea-pig tissues, vaninolol antagonized (-)isoproterenol-induced positive inotropic and chronotropic effects of the atria and tracheal relaxation responses in a concentration-dependent manner. The parallel shift to the right of the concentration-response curve of (-)isoproterenol suggested that vaninolol was a beta-adrenoceptor competitive antagonist. The effect of vaninolol was more potent on the atria than on tracheal tissues, indicating it had some beta 1-adrenoceptor selectivity. On the other hand, the order of the hydrophilicity was atenolol > vaninolol > propranolol. In addition, vaninolol had a mild direct cardiac depression at high concentrations and was without intrinsic sympathomimetic activity (ISA). Furthermore, binding characteristics of vaninolol and other beta-adrenoceptor antagonists were evaluated in [3H]dihydroalprenolol binding to guinea-pig ventricular membranes. The order of potency of beta-adrenoceptor antagonists in competing for the binding sites was (-)propranolol > vaninolol > or = atenolol. In conclusion, vaninolol was found to be a selective beta 1-adrenoceptor antagonist with relatively low lipophilicity in comparison with propranolol, devoid of ISA, and had a mild myocardial depressant effect.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Wu BN,Hwang TL,Liao CF,Chen IJ

subject

Has Abstract

pub_date

1994-07-05 00:00:00

pages

101-9

issue

1

eissn

0006-2952

issn

1873-2968

pii

0006-2952(94)90229-1

journal_volume

48

pub_type

杂志文章

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