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Molecular Pharmacology

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Research ArticleArticle

Mechanism of Action of Benzilylcholine Mustard at the Muscarinic Receptor

SURENDRA K. GUPTA, JOHN F. MORAN and DAVID J. TRIGGLE
Molecular Pharmacology November 1976, 12 (6) 1019-1026;
SURENDRA K. GUPTA
Departments of Biochemistry and Biochemical Pharmacology, Schools of Medicine, Dentistry, and Pharmacy, State University of New York at Buffalo, Buffalo, New York 14214
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JOHN F. MORAN
Departments of Biochemistry and Biochemical Pharmacology, Schools of Medicine, Dentistry, and Pharmacy, State University of New York at Buffalo, Buffalo, New York 14214
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DAVID J. TRIGGLE
Departments of Biochemistry and Biochemical Pharmacology, Schools of Medicine, Dentistry, and Pharmacy, State University of New York at Buffalo, Buffalo, New York 14214
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Abstract

The irreversible antagonism exerted by benzilylcholine mustard (BCM) on acetylcholine-induced contractions of the isolated guinea pig ileum can best be characterized by multiple sites of alkylation. BCM (50 µM, for 15 min) completely abolishes the response to acetylcholine, but the maximum responsiveness of the tissue recovers with time according to a first-order process (t1/2 of 45 min). Recovery of response is correlated with a first-order loss of tritium from tissues blocked with [3H]BCM (t1/2 of 38.9 min). The rightward shift of the dose-response curves observed after recovery of maximum response (acetylcholine dose ratio = 390) is stable over 8 hr, although the dose ratio would be expected to return toward control values if the receptor reserve model was applicable in this tissue. The data can best be interpreted on the basis that BCM alkylates two sites at the muscarinic receptor: an allosteric site which stabilizes an inactive form of the receptor, resulting in an apparent decrease in affinity for the agonist, and a second site which is postulated to be the agonist recognition site proper. Alkylation of the second site results in decreased maximum response.

  • Copyright © 1976 by Academic Press, Inc.

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Molecular Pharmacology
Vol. 12, Issue 6
1 Nov 1976
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Research ArticleArticle

Mechanism of Action of Benzilylcholine Mustard at the Muscarinic Receptor

SURENDRA K. GUPTA, JOHN F. MORAN and DAVID J. TRIGGLE
Molecular Pharmacology November 1, 1976, 12 (6) 1019-1026;

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Research ArticleArticle

Mechanism of Action of Benzilylcholine Mustard at the Muscarinic Receptor

SURENDRA K. GUPTA, JOHN F. MORAN and DAVID J. TRIGGLE
Molecular Pharmacology November 1, 1976, 12 (6) 1019-1026;
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