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. 1978 Apr;75(4):1713–1717. doi: 10.1073/pnas.75.4.1713

Interaction of ligands with the opiate receptors of brain membranes: Regulation by ions and nucleotides

Arthur J Blume 1
PMCID: PMC392409  PMID: 205867

Abstract

This study shows that nucleotides, as well as ions, regulate the opiate receptors of brain. GMP-P(NH)P and Na+ reduce the amount of steady-state specific [3H]dihydromorphine binding and increase the rate of dissociation of the ligand from the opiate receptor. In contrast, Mn2+ decreases the rate of ligand dissociation and antagonizes the ability of Na+ to increase dissociation. The effects of GMP-P(NH)P on steady-state binding and dissociation are not reversed by washing. Only GTP, GDP, ITP, and IMP-P(NH)P, in addition to GMP-P(NH)P, increase the rate of dihydromorphine dissociation. The site of nucleotide action appears to have high affinity: <1 μM GMP-P(NH)P produces half-maximal increases in ligand dissociation. GMP-P(NH)P- and Na+-directed increases in dissociation have also been found for the opiate agonists [3H]etorphine, [3H]Leu-enkephalin, and [3H]Met-enkephalin and the opiate antagonist [3H]naltrexone. Mn2+-directed decreases in dissociation have been found for the agonist [3H]-etorphine and the antagonist [3H]naltrexone. Although the plasma membrane receptors for a number of other neuro-transmitters and hormones are also regulated by guanine nucleotides, the opiate receptors appear unique because only they show nucleotide regulation of both agonist and antagonist binding.

Keywords: GMP-P(NH)P, agonists, antagonists

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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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