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- W2117318980 abstract "In this study we examined the interaction of opiates with kappa binding sites in the bovine adrenal medulla. [3H]Ethylketocyclazocine (EKC), [3H]etorphine, and [3H]bremazocine stereoselective bindings were used to assay these interactions. The kappa sites were found to be heterogeneous: [3H]bremazocine identified with high affinity all subtypes of these sites. [3H]EKC, in the presence of saturating concentrations of [D-Ala2, D-Leu5]-enkephalin (DADLE) (5 microM), was used to identify kappa 1 sites, on which dynorphin A (1-13) bound with high affinity. Either [3H]EKC or [3H]etorphine in the presence of 5 microM DADLE identified the kappa 2 subtype. This subtype was found to interact with beta-endorphin and especially with the octapeptide Met5-enkephalyl-Arg6-Gly7-Leu8. Furthermore, [3H]etorphine identified in the bovine adrenal medulla a third high-affinity component, in the presence of 5 microM DADLE. This residual interaction was found to be equally stereoselective and presenting kappa selectivity. Met5-enkephalyl-Arg6-Phe7 interacted preferentially with this site. The three kappa subtypes interacted differentially with monovalent (Na+, K+, and Li+) and divalent (Ca2+, Mg2+, and Mn2+) ions by modification of the apparent concentration of the accessible sites and/or by changes of the apparent KD for radioligands. Modifying agents (proteolytic enzymes, thiol-modifying reagents, and A2-phospholipase) produced different effects on each subtype of the kappa site, suggesting a different protein (or protein-lipid?) composition." @default.
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- W2117318980 date "1985-09-01" @default.
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- W2117318980 title "Interaction of Opiates with Opioid Binding Sites in the Bovine Adrenal Medulla: I. Interaction with ? and ? Sites" @default.
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- W2117318980 doi "https://doi.org/10.1111/j.1471-4159.1985.tb04046.x" @default.
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