The effects of neostigmine on the response of the rat anococcygeus muscle to field stimulation are not a consequence of cholinesterase inhibition

Warden-Smith, Jeremy and Spriggs, T. L. 1985. The effects of neostigmine on the response of the rat anococcygeus muscle to field stimulation are not a consequence of cholinesterase inhibition. Journal of Pharmacy and Pharmacology 37 (1) , pp. 49-52. 10.1111/j.2042-7158.1985.tb04929.x

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Abstract

Neostigmine (5 X 10(-7) to 5 X 10(-6) M) and physostigmine (10(-5) M) each augment the responses of the rat anococcygeus muscle to field stimulation whereas iso-OMPA (5 X 10(-6) to 5 X 10(-4) M) or BW 62c47 (5 X 10(-7) to 5 X 10(-5) M) do not. At a concentration of 10(-5) M, neostigmine. BW 62c47 and iso-OMPA respectively produced a 48, 50 and 68% inhibition of cholinesterase activity in homogenates of anococcygeus muscle. The ED50 for cholinesterase inhibition by neostigmine (1.4 X 10(-5) M) is approximately 15 fold greater than the ED50 for the augmentation of the response to field stimulation (9.5 X 10(-7) M). It is concluded that the action of neostigmine in augmenting the response of the rat anococcygeus muscle to field stimulation is not a consequence of cholinesterase inhibition even though stimulation of muscarinic receptors is implicated.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Biosciences Medicine
Subjects:	R Medicine > RM Therapeutics. Pharmacology
Publisher:	Wiley-Blackwell
ISSN:	0022-3573
Last Modified:	17 Mar 2021 02:35
URI:	https://orca.cardiff.ac.uk/id/eprint/10880

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