6-N,N-Dimethylamino-2,3-naphthalimide: A New Environment-Sensitive Fluorescent Probe in δ- and μ-Selective Opioid Peptides
摘要:
new environment-sensitive fluorophore, 6-N,N-(dimethylamino)-2,3-naphthalimide (6DMN) was introduced in the delta-selective opioid peptide agonist H-Dmt-Tic-Glu-NH2 and in the mu-selective opioid peptide agonist endomorphin-2 (H-Tyr-Pro-Phe-Phe-NH2). Environment-sensitive fluorophores are a special class of chromophores that generally exhibit a low quantum yield in aqueous solution but become highly fluorescent in nonpolar solvents or when bound to hydrophobic sites in proteins or membranes. New fluorescent delta-selective irreversible antagonists (H-Dmt-Tic-Glu-NH-(CH2)(5)-CO-Dap(6DMN)-NH2 (1) and H-Dmt-Tic-Glu-Dap(6DMN)-NH2 ( 2)) were identified as potential fluorescent probes showing good properties for use in studies of distribution and internalization of delta receptors by confocal laser scanning microscopy.
A new opioid designed multiple ligand derived from the μ opioid agonist endomorphin-2 and the δ opioid antagonist pharmacophore Dmt-Tic
作者:Severo Salvadori、Claudio Trapella、Stella Fiorini、Lucia Negri、Roberta Lattanzi、Sharon D. Bryant、Yunden Jinsmaa、Lawrence H. Lazarus、Gianfranco Balboni
DOI:10.1016/j.bmc.2007.08.047
日期:2007.11
Opioid compounds with mixed mu agonist/delta antagonist properties could be used as analgesics with low propensity to induce tolerance and dependence. Here we report the synthesis of a new designed multiple ligand deriving from the p selective agonist endomorphin-2 and the delta selective antagonist pharmacophore Dmt-Tic. As predicted, the resulting bivalent ligand showed a p agonist/delta antagonist profile deriving fi-om the corresponding activities of each pharmacophore. (C) 2007 Elsevier Ltd. All rights reserved.