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

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.

journal_name

Bioorg Med Chem

authors

Fujii H,Narita M,Mizoguchi H,Murachi M,Tanaka T,Kawai K,Tseng LF,Nagase H

doi

10.1016/j.bmc.2004.05.024

subject

Has Abstract

pub_date

2004-08-01 00:00:00

pages

4133-45

issue

15

eissn

0968-0896

issn

1464-3391

pii

S0968089604003840

journal_volume

12

pub_type

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