Effects of Calclium Channel Blockers and Hydralazine on Epinephrine-Induced Stimulation of Glucose Output from Primary Cultured Rat Hepatocytes

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Effects of calcium channel blockers from structurally different classes and hydralazine on epinephrine-induced stimulation of glucose output from primary cultured rat hepatocytes were examined in vitro. Diltiazem, verapamil, and nifedipine dose-dependently inhibited the epinephrine-induced stimulation of glucose output from the primary cultured rat hepatocytes. In contrast to these agents, nicardipine caused decreases in the basal and epinephrine-stimulated glucose output from rat hepatocytes in primary culture. Hydralazine treatment was found to reduce the response in a dose-dependent manner. These results indicate that the calcium channel blockers and hydralazine did not potentiate but reduce the epinephrine-induced stimulation of glucose output from primary cultures of rat hepatocytes in vitro.
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