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• W2003256310 abstract "The present study examined whether the kappa-opioid agonists U50,488H (trans-(+/-)-3,4-dichloro-N-methyl-N[-2-(1-pyrrolidinyl)- cyclohexyl]-benzeacetamide methane sulphonate), bremazocine, spiradoline and ICI 197067 bind to sigma sites in guinea-pig tissues using in vitro, semi-quantitative receptor autoradiography and receptor binding, and compared the binding profile so obtained with those for several selective sigma ligands. Guinea-pigs were killed and their brians, livers and spleens were removed, tissue sections cut and processed for sigma binding site autoradiography using (+)-[3H]-3-(3-hydroxyphenyl)-N-(1-propyl)piperidine ((+)-[3H]-3-PPP), or tissue was wiped and determined by liquid scintillation. Serial slide-mounted sections were incubated with 9-10 concentrations (1 nM-10 microM) of kappa opioids and their potency to inhibit (+)-[3H]-3-PPP binding compared with that of the sigma ligands haloperidol, DTG (1,3 di(o)-tolylguanidine), (+)-3-PPP, (+) and (-)pentazocine, SR 31742A and rimcazole (n = 3, duplicate determinations). Binding of (+)-[3H]-3-PPP to untreated, matched serial tissue sections was used as control. Kd values were estimated in brain, liver and spleen using quantitative, saturation binding analysis, IC50 values were determined from the binding data obtained by slide wiping experiments for each drug, and Ki values were calculated using the Cheng-Prussoff equation. All four kappa opioids inhibited (+)-[3H]-3-PPP binding to sigma 1-receptors with order of potency: brain: U50,488H = spiradoline > bremazocine > ICI 197067; liver: spiradoline > U50,488H > ICI 197067 > bremazocine; spleen: U50,488H > spiradoline > ICI 197067 > bremazocine. By comparison, the sigma ligands inhibited (+)-[3H]-3-PPP binding to matched, serial slide-mounted brain tissue sections (similar results in liver and spleen) with order of potency: SR 31742A > haloperidol > (+)pentazocine > (+)-3-PPP > DTG > (-)pentazocine > rimcazole. (+)-[3H]-3-PPP autoradiography confirmed these binding data. It is concluded that the kappa opioids tested moderately inhibit (+)-[3H]-3-PPP binding to sigma 1-receptors in guinea-pig brain, liver and spleen tissue with Ki values comparable to some selective sigma ligands and therefore are not opioid selective." @default.
• W2003256310 created "2016-06-24" @default.
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• W2003256310 date "1996-07-01" @default.
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• W2003256310 title "Kappa opioid receptor agonists inhibit sigma-1 (σ1) receptor binding in guinea-pig brain, liver and spleen: autoradiographical evidence" @default.
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• W2003256310 doi "https://doi.org/10.1016/0006-8993(96)00170-9" @default.
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