E-2078, a potent, selective and stable dynorphin analog with preferential activity for the kappa-opioid receptor subtype on the mouse vas deferens neuroeffector junction.
The profile of opioid activity of E-2078, a synthetic stable dynorphin analog, was examined in the mouse vas deferens bioassay and compared to that of methionine enkephalin and nonpeptide kappa agonists in the absence and in the presence of selective antagonists for the mu-, kappa- and delta-opioid receptor subtypes. The inhibitory action of E-2078 and related kappa agonists was specifically and potently antagonized only by norbinaltorphimine, revealing the presence of kappa receptors in this tissue and the predominant kappa activity of E-2078.
Department of Physiology, Faculty of Biological Sciences, P. Catholic University of Chile, Santiago.
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Valenzuela
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Tachibana
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JP
Huidobro-Toro
D000818:Animals; D004399:Dynorphins / Q000031:analogs & derivatives* / Q000494:pharmacology; D004744:Enkephalin, Methionine / Q000494:pharmacology; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D009271:Naltrexone / Q000031:analogs & derivatives / Q000494:pharmacology; D009469:Neuromuscular Junction / Q000187:drug effects; D010446:Peptide Fragments / Q000494:pharmacology*; D011758:Pyrroles / Q000494:pharmacology; D011957:Receptors, Opioid / Q000187:drug effects*; D017473:Receptors, Opioid, kappa; D009435:Synaptic Transmission / Q000187:drug effects; D013876:Thiophenes / Q000494:pharmacology; D014649:Vas Deferens / Q000187:drug effects
D010446:Peptide Fragments; D011758:Pyrroles; D011957:Receptors, Opioid; D017473:Receptors, Opioid, kappa; D013876:Thiophenes; C061285:E 2078; C054718:PD 117302; D004744:Enkephalin, Methionine; D009271:Naltrexone; C024524:beta-funaltrexamine; D004399:Dynorphins