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. 1976 Nov 15;160(2):163–169. doi: 10.1042/bj1600163

Effects of calcium-antagonistic drugs on the stimulation by carbamoylcholine and histamine of phosphatidylinositol turnover in longitudinal smooth muscle of guinea-pig ileum.

S S Jafferji, R H Michell
PMCID: PMC1164218  PMID: 1008847

Abstract

A number of drugs classed as calcium antagonists, spasmolytics, non-specific receptor antagonists or receptor antagonists with multiple sites of action were tested to determine whether they prevent the stimulation of phosphatidylinositol turnover caused in various tissues by the activation of receptors which increase cell-surface Ca2+ permeability. The experiments were done with fragments of longitudinal smooth muscle from guinea-pig ileum; these were incubated in vitro with 32Pi and either 100 muM-carbamoylcholine or 100 muM-histamine, in the presence of antagonistic drugs at concentrations at least sufficient to cause complete blockade of smooth-muscle contraction. The phosphatidylinositol response to carbamoylcholine was not changed by cinchocaine, papaverine, nifedipine, dibenamine, amethocaine, cinnarizine, lidoflazine, methoxyverapamil, prenylamine or two antimuscarinic alkane-bis-ammonium compounds, and the response to histamine was unaffected by the first four drugs. In contrast, phenoxybenzamine prevented the increase in phosphatidylinositol labelling caused by either carbamoylcholine or histamine. The insensitivity of the phosphatidylinositol response to most of the drugs provides further experimental support for the conclusion that the receptor-stimulated phosphatidylinositol breakdown which initiates the increase in phosphatidylinositol turnover is not caused by an increase in intracellular Ca2+. The simplest interpretation of the available information appears to be that phosphatidylinositol breakdown plays a role in the coupling between the receptor-agonist interaction and the opening of cell-surface Ca2+ gates [Michell, R. H. (1975) Biochim. Biophys. Acta 415, 81-147]. If this is correct, then phenoxybenzamine must exert its inhibitory effects on phosphatidylinositol breakdown early in this sequence of events, but the drugs must act at a stage later than phosphatidylinositol breakdown. The unexpected difference in the effects of dibenamine and phenoxybenzamine, which are chemically very similar, may provide a useful experimental tool with which to explore the way in which activated receptors provoke the opening of cell-surface Ca2+ gates.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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