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As important pharmacological probes, highly selective opioid receptor antagonists are essential in opioid receptor structural characterization and opioid agonist functional studies. At present, a nonpeptidyl, highly selective, and reversible mu opioid receptor antagonist is still not available. Among a series of novel naltrexamine derivatives that have been designed and synthesized following molecular modeling studies, two compounds, NAP and NAQ, were identified as leads based on the results of in vitro and in vivo pharmacological assays. Both of them displayed high binding affinity and selectivity to the mu opioid receptor. Further pharmacokinetic and functional characterization revealed that NAP seems to be a peripheral nervous system agent while NAQ seems to be a central one. Such characteristics provide two distinguished potential application routes for these two agents and their derivatives. These results also supported our hypothesis that they may serve as leads to develop more potent and selective antagonists for the mu opioid receptor.

acs chemical neuroscience

Characterization of 6α- and 6β-<i>N</i>-Heterocyclic Substituted Naltrexamine Derivatives as Novel Leads to Development of Mu Opioid Receptor Selective Antagonists

Characterization of 6α- and 6β-N-Heterocyclic Substituted Naltrexamine Derivatives as Novel Leads to Development of Mu Opioid Receptor Selective Antagonists