title: Drug design and synthesis of epsilon opioid receptor agonist: 17-(cyclopropylmethyl)-4,5alpha-epoxy-3,6beta-dihydroxy-6,14-endoethenomorphinan-7alpha-(N-methyl-N-phenethyl)carboxamide (TAN-821) inducing antinociception mediated by putative epsilon opioid receptor.
abstract: Here we report the new drug design and synthesis of a series of 6,14-endoethenomorphinan-7-carboxamide derivatives as a putative epsilon opioid receptor agonist. One of these compounds, 17-(cyclopropylmethyl)-4,5alpha-epoxy-3,6beta-dihydroxy-6,14-endoethenomorphinan-7alpha-(N-methyl-N-phenethyl)carboxamide (TAN-821), showed agonistic activity for a putative epsilon opioid receptor (IC(50) = 71.71nM) in the rat vas deferens (RVD) preparations. TAN-821 stimulated the binding of the nonhydrolyzable guanosine 5'-triphosphate analog, guanosine 5'-(gamma-thio)-triphosphate (GTPgammaS), to the mouse pons/medulla membrane via the activation of putative epsilon opioid receptor. Moreover, TAN-821 given intracerebroventricularly (i.c.v.) produced a marked antinociception in the tail-flick test (ED(50) = 1.73 microg) and the hot-plate test (ED(50) = 2.05 microg) in a dose-dependent manner. The antinociception induced by TAN-821 administered i.c.v. was blocked by the i.c.v.-pretreatment with a putative epsilon opioid receptor partial agonist beta-endorphin [1-27], but not a mu opioid receptor antagonist beta-FNA, a delta opioid receptor antagonist NTI, or a kappa opioid receptor antagonist nor-BNI. The present results suggest that TAN-821 may be a useful tool for the investigation on the pharmacological properties of the putative epsilon opioid receptor.
authors.affiliation: Pharmaceutical Research Laboratories, Toray Industries Inc., 1111Tebiro, Kamakura, Kanagawa 248-8555, Japan. hideaki_fujii@nts.toray.co.jp
authors.forename: Hideaki
authors.initials: H
authors.lastname: Fujii
authors.forename: Minoru
authors.initials: M
authors.lastname: Narita
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Mizoguchi
authors.forename: Miho
authors.initials: M
authors.lastname: Murachi
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Tanaka
authors.forename: Koji
authors.initials: K
authors.lastname: Kawai
authors.forename: Leon F
authors.initials: LF
authors.lastname: Tseng
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nagase
mesh_terms: D000081:Acetamides / Q000138:chemical synthesis* / Q000494:pharmacology*; D000818:Animals; D001665:Binding Sites; D004305:Dose-Response Relationship, Drug; D015195:Drug Design; D016244:Guanosine 5'-O-(3-Thiotriphosphate) / Q000819:agonists / Q000378:metabolism; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D008968:Molecular Conformation; D009019:Morphinans / Q000138:chemical synthesis* / Q000494:pharmacology; D009130:Muscle, Smooth / Q000187:drug effects; D010147:Pain Measurement / Q000187:drug effects; D017288:Pain Threshold / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D011957:Receptors, Opioid / Q000819:agonists*; D013997:Time Factors
chemical_list: C496009:17-(cyclopropylmethyl)-4,5alpha-epoxy-3,6beta-dihydroxy-6,14-endoethenomorphinan-7alpha-(N-methyl-N-phenethyl)carboxamide; D000081:Acetamides; D009019:Morphinans; D011957:Receptors, Opioid; C043460:epsilon receptor; D016244:Guanosine 5'-O-(3-Thiotriphosphate)