Primary structures and expression from cDNAs of rat opioid receptor δ‐and μ‐subtypes

The complete amino acid sequences of rat opioid receptors (designated as ROR‐A and ROR‐B) have been deduced by cloning and sequencing the cDNAs. The ligand‐binding properties of ROR‐A and ROR‐B expressed from the cloned cDNAs in Chinese hamster ovary cells correspond most closely to those of the pharmacologically defined δ‐ and μ‐opioid receptor subtypes, respectively. RNA blot hybridization analysis revealed that cerebrum and brainstem contain both ROR‐A and ROR‐B mRNAs, whereas neither ROR‐A nor ROR‐B mRNAs can be detected in cerebellum.

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