Narcotic antagonistic potency of bivalent ligands which contain beta-naltrexamine. Evidence for bridging between proximal recognition sites.

Abstract:

:Two-bivalent ligands (P-X-P) containing the beta-naltrexamine pharmacophore (P) and a connecting oligoethylene glycol spanner (X) were synthesized and evaluated for narcotic antagonistic activity in the guinea pig ileum (GPI) and mouse vas deferens (MVD). The bivalent ligand 2 whose spanner contains three ethylene units possessed 10-fold greater antagonistic potency than its monovalent analogue (4) in antagonizing the effects of ethylketazocine (EK) on the GPI, while no differential antagonism of morphine was observed among the compounds. In the MVD, 2 was not substantially more potent than 4 as an antagonist against [D-Ala2,D-Leu5]enkephalin (DADLE). The bivalent ligand 3, whose spanner contains six ethylene units, exhibited 15 times greater potency in antagonizing the agonist effects of DADLE on the MVD than its monovalent ligand 4. No marked increase in the ability of 3 to antagonize the effects of morphine or EK on the GPI was observed. The data indicate that mu, kappa, and delta opioid receptors exhibit different selectivity toward bivalent ligands whose spanner lengths differ. The enhanced potency associated with different receptor interactions is consistent with simultaneous occupation of proximal recognition sites. Whether such proximal recognition sites are identical or different remains to be clarified. The distance between proximal sites appears to depend on the opioid receptor subtype involved.

journal_name

J Med Chem

authors

Erez M,Takemori AE,Portoghese PS

doi

10.1021/jm00349a016

subject

Has Abstract

pub_date

1982-07-01 00:00:00

pages

847-9

issue

7

eissn

0022-2623

issn

1520-4804

journal_volume

25

pub_type

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