A quantitative study of the effects of some muscarinic antagonists on the guinea‐pig olfactory cortex slice

Open Access
Publisher Website
Google Scholar
Abstract
1 Muscarinic depression of the electrically-evoked surface-negative field potential (N-wave) was measured in guinea-pig olfactory cortex slices maintained in vitro. 2 The effects of three muscarinic receptor antagonists, pirenzepine, atropine and gallamine on this muscarinic response were analysed in detail. 3 Pirenzepine was a potent competitive antagonist of carbachol (CCh)-evoked responses. Schild plot analysis yielded a pA2 value of 7.9 (Schild slope constrained to unity). A similar analysis for atropine versus CCh responses gave a pA2 of 8.9. 4 Combination experiments using pirenzepine and atropine produced dose-ratio shifts close to those expected for two antagonists competing for a similar receptor site. 5 Gallamine was only a weak antagonist of responses to CCh. 6 Oxotremorine behaved as a competitive antagonist at this muscarinic receptor (pA2 = 6.1). 7 It is concluded that the presynaptic muscarinic receptor mediating depression of the N-wave in the olfactory cortex slice is of the M1-subtype.