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Discovery of a Potent and Efficacious Peptide Derivative for δ/μ Opioid Agonist/neurokinin 1 Antagonist Activity with a 2',6'-dimethyl-L-tyrosine: in Vitro, in Vivo, and NMR-based Structural Studies

Overview
Journal J Med Chem
Specialty Chemistry
Date 2011 Mar 4
PMID 21366266
Citations 14
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Abstract

Multivalent ligands with δ/μ opioid agonist and NK1 antagonist activities have shown promising analgesic potency without detectable sign of toxicities, including motor skill impairment and opioid-induced tolerance. To improve their biological activities and metabolic stability, structural optimization was performed on our peptide-derived lead compounds by introducing 2',6'-dimethyl-L-tyrosine (Dmt) instead of Tyr at the first position. The compound 7 (Dmt-D-Ala-Gly-Phe-Met-Pro-Leu-Trp-NH-[3',5'-(CF(3))(2)-Bzl]) showed improved multivalent bioactivities compared to those of the lead compounds, had more than 6 h half-life in rat plasma, and had significant antinociceptive efficacy in vivo. The NMR structural analysis suggested that Dmt(1) incorporation in compound 7 induces the structured conformation in the opioid pharmacophore (N-terminus) and simultaneously shifts the orientation of the NK1 pharmacophore (C-terminus), consistent with its affinities and activities at both opioid and NK1 receptors. These results indicate that compound 7 is a valuable research tool to seek a novel analgesic drug.

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