Effects of some beta-adrenoceptor blockers on avoidance learning in rats.
In experiments on male Wistar rats, we studied the effects of some beta-adrenoceptor blockers: nonselective-propranolol, pindolol and 3b (a new aminotetraline derivative); and cardioselective (beta 1)-acebutolol and talinolol, on avoidance learning. The nonselective beta-adrenoceptor blockers failed to deteriorate and in some cases even facilitated learning, estimated by the number of avoidance responses and their latencies, while the cardioselective blockers significantly impaired learning process. A significant learning-impairing effect was shown by the beta 2-adrenoceptor agonist salbutamol. Similar was the effect of the mixed alpha- and beta-adrenoceptor blocker labetalol. The results are interpreted in connection with the functional role of beta 1- and beta 2- adrenoceptors in the CNS and with the importance of their balance for learning process.
Staneva-Stoytcheva
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Institute of Physiology, Bulgarian Academy of Sciences, Sofia.
Astrug
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A
Ivanov
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D000317:Adrenergic alpha-Antagonists / Q000494:pharmacology; D000319:Adrenergic beta-Antagonists / Q000494:pharmacology*; D000818:Animals; D001362:Avoidance Learning / Q000187:drug effects*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains
D000317:Adrenergic alpha-Antagonists; D000319:Adrenergic beta-Antagonists