Affinity profiles of novel delta-receptor selective benzofuran derivatives of non-peptide opioids.

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Spetea M, Nevin ST, Hosztafi S, Ronai AZ, Toth G, Borsodi A

Affinity profiles of novel delta-receptor selective benzofuran derivatives of non-peptide opioids.

Neurochem Res. 1998 Sep;23(9):1211-6.

PubMed ID

9712193 [ View in PubMed

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Abstract

Highly selective heterocyclic opioid ligands with potent delta-antagonist activity have been developed on the basis of the "message-address" concept. Using this strategy, benzofuran derivatives corresponding to the non-selective opioid antagonist, naloxone, and to the mu-opioid receptor selective agonists, oxymorphone and oxycodone, were synthesized. In vitro opioid receptor binding profiles and agonist/antagonist character of these compounds were determined in rat brain membrane preparations with highly selective radioligands. All three benzofuran derivatives displayed high affinities for the delta-opioid receptor, much less potency toward the mu-binding site, and were the least effective at the kappa-site. The results indicated that the addition of the bezofuran moiety to these fused ring opioids confers delta-receptor selectivity. The Na+ indices suggested a partial agonist character for oxymorphone- and oxycodone-benzofuran, and an antagonist character for naloxone-benzofuran. These compounds were capable of irreversible inhibition of opioid binding sites in a dose-dependent.

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Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Oxymorphone	Mu-type opioid receptor	Protein	Humans	Yes	Agonist	Details