Abstract:
:Methoctramine, a selective M2 alpha muscarinic receptor antagonist, was examined for its ability to inhibit carbachol-induced drinking in the rat. Intracerebroventricularly (i.c.v.) administered methoctramine was devoid of activity up to a dose of 100 nmol/rat, whereas higher doses were toxic under our experimental conditions. 4-DAMP, pirenzepine and hexahydrosiladifenidol were also tested. The rank potency order for the compounds (4-DAMP greater than pirenzepine = hexahydrosiladifenidol) was similar to that for their affinity at M1 receptors, as found in experiments in vitro. The putative M1 agonist McN-A-343 was inactive up to doses of 13.9 micrograms/rat. Our data suggest that M2 alpha receptors do not mediate cholinergic drinking in the rat. The question whether M1 or M2 beta muscarinic receptors are involved in this response still awaits a firm answer.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Massi M,Polidori C,Melchiorre Cdoi
10.1016/0014-2999(89)90213-6subject
Has Abstractpub_date
1989-04-25 00:00:00pages
387-91issue
2-3eissn
0014-2999issn
1879-0712pii
0014-2999(89)90213-6journal_volume
163pub_type
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