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. 1977 Aug;74(8):3365–3369. doi: 10.1073/pnas.74.8.3365

Opiate-dependent modulation of adenylate cyclase.

S K Sharma, W A Klee, M Nirenberg
PMCID: PMC431562  PMID: 269396

Abstract

Reactions mediated by the opiate receptors that inhibit adenylate cyclase (EC 4.6.1.1) are closely coupled to subsequent reactions that gradually increase adenylate cyclase activity of neuroblastoma X glioma NG108-15 hybrid cells. Opiate-treated cells have higher basal-, prostaglandin E1-, and 2-chloroadenosine-stimulated activities than do control cells. However, NaF or guanosine 5'-(beta, gamma-imido)triphosphate abolishes most of the differences in adenylate cyclase activity observed with homogenates from control and opiate-treated cells. Cycloheximide blocked some, but not all, of the opiate-dependent increase in adenylate cyclase activity. These results suggest that the opiate-dependent increase in adenylate cyclase is due to conversion of adenylate cyclase to a form with altered activity. Protein synthesis also is required for part of the opiate effect. We propose that activity of adenylate cyclase determines the rate of conversion of the enzyme from one form to the other and that opiates, by inhibiting adenylate cyclase, alter the relative abundance of low- and high-activity forms of the enzyme.

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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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