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. 1979 Nov;76(11):5626–5630. doi: 10.1073/pnas.76.11.5626

Coupling of opiate receptors to adenylate cyclase: requirement for Na+ and GTP.

A J Blume, D Lichtshtein, G Boone
PMCID: PMC411702  PMID: 230486

Abstract

Inhibition of the adenylate cyclase activity in homogenates of mouse neuroblastoma-glioma hybrid cells (NG108-15) by the opioid peptide [D-Ala2,Met5]enkephalin amide (AMEA) requires the presence of Na+ and GTP. In this process, the selectivity for monovalent cations is Na+ greater than or equal Li+ greater than K+ greater than choline+; ITP will replace GTP but ATP, UTP, or CTP will not. The apparent Km for Na+ is 20 mM and for GTP it is 1 microM. Under saturating Na+ and GTP conditions, the apparent Ki for AMEA-directed inhibition is 20 nM for basal and 100 nM for prostaglandin E1-activated adenylate cyclase activity. For both cyclase activities, maximal inhibition is only partial (i.e., approximately 55% of control in each case). In intact viable NG108-15 cells, the decrease in basal and prostaglandin E1-stimulated intracellular cyclic AMP concentrations by AMEA is also dependent upon extracellular Na+. The enkephalin-directed reductions in cyclic AMP concentrations are at least 75%. The specificity of the monovalent cation requirement for enkephalin action on intact cells is the same as for enkephalin regulation of homogenate adenylate cyclase activity. Based on these data, a model is presented in which the transfer of information from opiate receptors to adenylate cyclase requires active separate membrane components, which correspond to the sites of action of Na+ and GTP in this process.

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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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