Abstract

Rat liver membranes prepared by a modification of the procedure of Neville were exposed to clinical and toxic concentrations of the general anesthetic, halothane, for 10 minutes. Basal, glucagon (5 × 10 −5M) and sodium fluoride (20 mM) stimulated adenylate cyclase activity was assayed. Clinical and toxic concentrations of halothane augmented basal adenylate cyclase activity. Glucagon and sodium fluoride stimulated adenylate cyclase activity was enhanced at greater than clinically useful halothane concentrations only. The study provides direct evidence that halothane stimulates adenylate cyclase, the extent of augmentation of enzyme activity is halothane concentration dependent, and modified by other drugs.

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