title: Characterization of solubilized human and rat brain beta-endorphin-receptor complex.
abstract: Opioid receptors have been solubilized from human striatal and rat whole-brain membranes by use of 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate (CHAPS). Tritiated human beta-endorphin (3H-beta h-EP) binding revealed high-affinity competition by morphine, naloxone, and various beta-EP analogues, suggesting predominantly mu-type binding. Lack of high-affinity competition by (+/-)-3,4-dichloro-N-methyl-N-[2-(1-pyrrolidinyl)cyclohexyl]benzeneaceta mide methanesulfonate (U50-488, Upjohn) indicated that kappa sites were not labeled by 3H-beta h-EP under these conditions. Affinities were similar in both soluble and membrane preparations except for [Met]enkephalin, which appears to be rapidly degraded by the solubilized extract. Size differences between human and rat solubilized 3H-beta h-EP-receptor complexes were revealed by exclusion chromatography.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000818:Animals; D001667:Binding, Competitive; D001921:Brain / Q000378:metabolism*; D002421:Caudate Nucleus / Q000378:metabolism; D002462:Cell Membrane / Q000378:metabolism; D002793:Cholic Acids; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D003342:Corpus Striatum / Q000378:metabolism; D004723:Endorphins / Q000378:metabolism*; D004744:Enkephalin, Methionine / Q000378:metabolism; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009020:Morphine / Q000378:metabolism; D009270:Naloxone / Q000378:metabolism; D011699:Putamen / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D011957:Receptors, Opioid / Q000378:metabolism*; D012995:Solubility; D001615:beta-Endorphin
chemical_list: D002793:Cholic Acids; D004723:Endorphins; D011957:Receptors, Opioid; D009270:Naloxone; D004744:Enkephalin, Methionine; D001615:beta-Endorphin; D009020:Morphine; C028213:3-((3-cholamidopropyl)dimethylammonium)-1-propanesulfonate