作者: Yunyun Yuan , Saheem A. Zaidi , David L. Stevens , Krista L. Scoggins , Philip D. Mosier
DOI: 10.1016/J.BMC.2015.02.055
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摘要: Abstract A series of 17-cyclopropylmethyl-3,14β-dihydroxy-4,5α-epoxy-6α-(isoquinoline-3′-carboxamido)morphinan (NAQ) analogues were synthesized and pharmacologically characterized to study their structure–activity relationship at the mu opioid receptor (MOR). The competition binding assay showed two-atom spacer aromatic side chain optimal for MOR selectivity. Meanwhile, substitutions 1′- and/or 4′-position isoquinoline ring retained or improved selectivity over kappa while still possessing above 20-fold delta receptor. In contrast, 6′- 7′-position reduced as well efficacy. Among this ligands, compound 11 acted an antagonist when challenged with morphine in warm-water tail immersion produced less significant withdrawal symptoms compared naltrexone morphine-pelleted mice. Compound also antagonized intracellular Ca2+ increase induced by DAMGO. Molecular dynamics simulation studies three receptors indicated orientation 6′-nitro group varied significantly different ‘address’ domains played a crucial role observed affinities Collectively, current findings provide valuable insights future development NAQ-based selective ligands.