Action of loperamide on neuronally mediated and Ca2+- or cAMP-mediated secretion in rat colon.

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Diener M, Knobloch SF, Rummel W

Action of loperamide on neuronally mediated and Ca2+- or cAMP-mediated secretion in rat colon.

Eur J Pharmacol. 1988 Aug 2;152(3):217-25.

PubMed ID

2851449 [ View in PubMed

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Abstract

The action of loperamide on the ion secretion evoked in rat colon descendens by electric field stimulation of enteric neurons, on the Ca2+-dependent secretion due to carbachol, and on the cAMP-mediated secretion elicited by forskolin was studied. Loperamide blocked all three types of secretion, but about 10 times higher concentrations of the drug were necessary to block the secretion caused by forskolin than to block the secretion mediated neuronally or by Ca2+. All the effects of loperamide were mimicked by trifluoperazine, a calmodulin antagonist. Neither morphine nor the Ca2+ channel blocker, verapamil, mimicked the effects of loperamide on ion transport. Therefore it seems reasonable to conclude that the antisecretory action of loperamide in the rat colon is caused by a block of the calmodulin system.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Loperamide	Calmodulin	Protein	Humans	Unknown	Inhibitor	Details