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. 1983 Aug 15;214(2):547–552. doi: 10.1042/bj2140547

Insulin exerts actions through a distinct species of guanine nucleotide regulatory protein: inhibition of adenylate cyclase.

C M Heyworth, M D Houslay
PMCID: PMC1152279  PMID: 6311187

Abstract

Insulin failed to exert an effect on the basal and glucagon- and guanosine 5'-[beta, gamma-imido]-triphosphate-stimulated adenylate cyclase activities of hepatocyte membranes. In the presence of high GTP (0.1 mM) concentrations, however, insulin was shown to inhibit adenylate cyclase activity. This effect was dose-dependent, exhibiting an EC50 (median effective concentration) of 3 microM for GTP. Elevated glucagon concentrations blocked the inhibitory effect of insulin in a dose-dependent fashion, with an EC50 of 1 nM. The insulin inhibition was dose-dependent (EC50 = 90 pM). The inhibitory effects of insulin were abolished using membranes from either glucagon-desensitized hepatocytes or cholera-toxin-treated hepatocytes. If either Mn2+ replaced Mg2+ in adenylate cyclase assays or Na+ was removed from the assay mixtures then insulin failed to exert any inhibitory effect. It is suggested that insulin exerts its action on adenylate cyclase through an inhibitory guanine nucleotide protein. This is integrated with the proposal [Heyworth, Rawal & Houslay (1983) FEBS Lett. 154, 87-91; Heyworth, Wallace & Houslay (1983) Biochem. J. in the press] that insulin mediates a variety of cellular effects through a specific guanine nucleotide regulatory protein and associated protein kinase(s).

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Selected References

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