Desethylaprophen: a metabolite of aprophen with antimuscarinic activities.

Abstract:

:The metabolic fate of aprophen hydrochloride (2-diethylaminoethyl 2,2-diphenylpropionate) was studied in rats after intravenous administration. Both 14C-labeled and unlabeled aprophen were used in these studies. Blood samples were collected and analyzed to determine the identities of the metabolites formed. Utilizing high-performance liquid chromatography, desethylaprophen was identified as a major metabolite in ether-extracted samples from rats, and could be detected in blood samples 1 min after intravenous administration. It was most likely formed by N-de-ethylation of aprophen by a cytochrome P-450-dependent monooxygenase. Synthetic desethylaprophen was found to possess cholinolytic activity (i.e., it functioned as a muscarinic antagonist by blocking the contraction of acetylcholine-stimulated guinea pig ileum, the release of alpha-amylase from pancreatic acinar cells stimulated by carbachol, and also by inhibiting the binding of [3H]N-methyl scopolamine to the muscarinic receptors of guinea pig ileum). It was interesting that although the biological effects of desethylaprophen were 100-fold lower than those of aprophen, it was equally able to compete for the binding sites of muscarinic receptors of the guinea pig ileum.

journal_name

J Pharm Sci

authors

Brown ND,Smejkal RM,Breuer E,Doctor BP,Chiang PK

doi

10.1002/jps.2600770210

subject

Has Abstract

pub_date

1988-02-01 00:00:00

pages

145-8

issue

2

eissn

0022-3549

issn

1520-6017

pii

S0022-3549(15)47627-0

journal_volume

77

pub_type

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