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. 1982 Dec;79(23):7570–7574. doi: 10.1073/pnas.79.23.7570

Preparation of brain membranes containing a single type of opioid receptor highly selective for dynorphin.

I F James, C Chavkin, A Goldstein
PMCID: PMC347382  PMID: 6130527

Abstract

Opioid receptors on guinea pig brain membranes were alkylated by the naltrexone analogue beta-chlornaltrexamine. Binding of the prototypical mu and kappa ligands, [3H]dihydromorphine and [3H]ethylketocyclazocine, was more readily affected by the reagent than was binding of the delta ligand, 3H-labeled [D-Ala2, D-Leu5]enkephalin. Treatment of membranes with beta-chlornaltrexamine in the presence of dynorphin resulted in significant protection of [3H]ethylketocyclazocine binding sites, without protection of [3H]dihydromorphine or 3H-labeled [D-Ala2, D-Leu5]enkephalin sites. Similarly, [D-Ala2, D-Leu5]enkephalin and sufentanil selectively protected binding sites for 3H-labeled [D-Ala2, D-Leu5]enkephalin and [3H]dihydromorphine, respectively. Scatchard analysis of [3H]ethylketocyclazocine binding to untreated membranes suggested two types of binding site with 40-fold difference in affinities. Membranes treated with beta-chlornaltrexamine in the presence of dynorphin retained about 40% of the high-affinity sites and lost the low-affinity sites. Selective protection of sites with high affinity for dynorphin and ethylketocyclazocine was confirmed in competition binding assays. These results strongly suggest that the three types of opioid receptor are not interconvertible and provide further evidence that the endogenous peptide dynorphin is a highly selective ligand of the kappa opioid receptor.

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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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