Chronic ethanol treatment of rats and the myocardial beta-adrenoceptors.
We examined the effect of chronic treatment with ethanol on the dynamics of beta-adrenoceptor binding in left ventricular myocardium of rats. After treatment with BAAM (20 mg/kg i.p.), an irreversible inhibitor of beta-adrenoceptors, the inhibition of beta-adrenoceptor binding was less, and the recovery of receptor binding was faster in chronically ethanol-treated rats compared to the control animals given equicaloric dextrin maltose treatment. When intracellular beta-adrenoceptor recycling was inhibited with colchicine, cytoplasmic left ventricular beta-adrenoceptor binding was greater in ethanol-treated compared to dextrin maltose-treated animals. We conclude that the previously reported decreased functional activity of the beta-adrenoceptor-mediated system probably reflects the contribution of ethanol-mediated effects not entirely restricted to the receptor-binding mechanisms.
Center of Alcohol Studies, Rutgers University, Piscataway, NJ 08854.
L A
LA
Pohorecky
M
M
Hamm
H
H
Chaudhury
R
R
Ponticiello
D J
DJ
Knapp
D000319:Adrenergic beta-Antagonists / Q000494:pharmacology; D000437:Alcoholism / Q000378:metabolism*; D000526:Alprenolol / Q000031:analogs & derivatives / Q000494:pharmacology; D000818:Animals; D003078:Colchicine / Q000494:pharmacology; D000431:Ethanol / Q000008:administration & dosage / Q000494:pharmacology*; D008297:Male; D009206:Myocardium / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D011943:Receptors, Adrenergic, beta / Q000187:drug effects / Q000378:metabolism*
D000319:Adrenergic beta-Antagonists; D011943:Receptors, Adrenergic, beta; D000431:Ethanol; C045331:bromoacetylalprenololmenthane; D000526:Alprenolol; D003078:Colchicine