Cardiac Alpha 1-adrenoceptor Densities in Different Mammalian Species

Overview

Journal Br J Pharmacol

Publisher Wiley

Specialty Pharmacology

Date 1992 Sep 1

PMID 1330160

Citations 21

Authors

M Steinfath

Y Y Chen

J Lavicky

O Magnussen

M Nose

S Rosswag

W Schmitz

H Scholz

Affiliations

Soon will be listed here.

Abstract

1. alpha 1-Adrenoceptor densities were studied in cardiac membrane preparations from several mammalian species including human failing hearts under identical experiment conditions; the alpha 1-adrenoceptor antagonist, [3H]-prazosin, was used as radioligand. End-stage heart failure (NYHA IV) in human hearts was due to idiopathic dilated cardiomyopathy. 2. The ventricular alpha 1-adrenoceptor densities were not significantly different in guinea-pig, mouse, pig, calf, and man (11 to 18 fmol mg-1 protein) but about 5 to 8 fold smaller than in rat (about 90 fmol mg-1 protein). Right and left ventricular receptor densities were similar in these species. 3. A sufficient amount of right and left atrial tissue was obtained from rabbit, pig, calf, and man only. The alpha 1-adrenoceptor densities in both atria of these species were found to be at the detection limit of the method used (less than 8 fmol mg-1 protein). 4. The equilibrium dissociation constant (KD) was similar in all species studied ranging from 0.047 +/- 0.006 to 0.063 +/- 0.007 nmol l-1. 5. It is concluded that differences in alpha 1-adrenoceptor density between atria and ventricles may exist in mammalian species. The exceptionally high density of these receptors in rat ventricles seem to be a particular feature in these animals.

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