title: Kappa binding sites in guinea-pig brain membranes: evidence for a dynorphin-resistant subtype.
abstract: Using [3H]ethylketocyclazocine after suppression of mu, delta and sigma binding by 100 nM DAGO + 100 nM DADLE + 10 microM phencyclidine we showed the existence of a subclass of kappa sites insensitive to dynorphins 1-9 and 1-17, and alpha and beta neoendorphins, but sensitive to the non-peptidic opiates. The dynorphin-sensitive site probably corresponds to the "standard" kappa site while the importance of the dynorphin-resistant site remains to be established.
mesh_terms: D000701:Analgesics, Opioid / Q000378:metabolism; D000818:Animals; D001667:Binding, Competitive; D001921:Brain / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism; D003496:Cyclazocine / Q000031:analogs & derivatives / Q000378:metabolism; D016314:Ethylketocyclazocine; D006168:Guinea Pigs; D008297:Male; D010622:Phencyclidine / Q000494:pharmacology; D011957:Receptors, Opioid / Q000187:drug effects / Q000378:metabolism*; D017473:Receptors, Opioid, kappa
chemical_list: D000701:Analgesics, Opioid; D011957:Receptors, Opioid; D017473:Receptors, Opioid, kappa; D016314:Ethylketocyclazocine; D010622:Phencyclidine; D003496:Cyclazocine