Muscarinic M1 mediation of carbacholinduced theta in the cat entorhinal cortex in vitro

Autor: GoleLbiewski, Henryk, Eckersdorf, Barbara, Blaszczyk, Marcin, Grabowski, Robert, Konopacki, Jan
Zdroj: NeuroReport; October 1994, Vol. 5 Issue: 15 p1989-1992, 4p
Abstrakt: ENTORHINAL cortex slice preparations obtained from the cat exhibited theta rhythm during perfusion with 50 mUM carbachol. The effect of carbachol was antagonized by the muscarinic blocker atropine sulphate, but not by hexamethonium and mecamylamine, which are antagonists of the nicotinic receptor. Further analysis of the pharmacological profile of these carbachol-induced theta oscillations showed the M1 receptor subtype to be involved in mediation of this EEG activity: the theta rhythm was antagonized by the M1 receptor blocker pirenzepine, but was unaffected by gallamine, an antagonist of the M2 receptor subtype.
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