The effect of two anticholinergic drugs administered intracerebroventricularly on acquisition of an 8-arm radial maze task was examined in the rat. Increasing doses of atropine (1, 4.5, 22.5, 45 μg/rat) and pirenzepine (4.5, 15, 60, 90 μg/rat) significantly impaired performance in the working-memory components of the task. For both drugs this impairment was linearly related to the log of the administered doses and log-dose-response relationships were parallel. The regression lines calculated for each parameter for both drugs were parallel to each other, thus allowing us to calculate the potency of atropine versus pirenzepine: atropine was 5.4 times more potent than pirenzepine for correct arm entries, 10 times more potent for the number of errors and 4 times more potent for the total time taken to complete the task. The relevance of M1 and M2 subtype central acetylcholine receptors in cognitive processes is discussed.
|Titolo:||Effect of centrally administered atropine and pirenzepine on radial arm maze performance in the rat|
|Parole Chiave:||(Intracerebroventricular administration); Atropine; Pirenzepine; Radial maze|
|Settore Scientifico Disciplinare:||Settore BIO/14 - Farmacologia|
|Data di pubblicazione:||1991|
|Digital Object Identifier (DOI):||10.1016/0014-2999(91)90122-7|
|Appare nelle tipologie:||01 - Articolo su periodico|