Westphal M, Li CH, Heimer EP, Meienhofer J. Peptide E: opiate receptor binding profile in the rat brain membrane assay. Comparison with beta-endorphin.
Biochem Biophys Res Commun 1983;
114:1084-8. [PMID:
6311195 DOI:
10.1016/0006-291x(83)90673-3]
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Abstract
Beta-endorphin (beta-EP) and peptide E were compared in respect to their binding potency in the rat brain membrane by radioreceptor binding assay using tritiated human beta-EP, [D-Ala2,D-Leu5]-enkephalin (DADLE), dihydromorphine (DHM) and ethylketocyclazocine (EKC) as primary ligands. When the potency of beta h-EP was chosen to be 100%, peptide E was equipotent with beta-EP in displacing DHM (95%) and EKC (103%) less potent for competing with beta h-EP (60%) and least active (7%) for displacing DADLE. It may be concluded that peptide E binds preferentially with the opiate mu and kappa receptors in the rat brain membrane.
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