Development of VU6019650: A Potent, Highly Selective, and Systemically Active Orthosteric Antagonist of the M5 Muscarinic Acetylcholine Receptor for the Treatment of Opioid Use Disorder

J Med Chem. 2022 Apr 28;65(8):6273-6286. doi: 10.1021/acs.jmedchem.2c00192. Epub 2022 Apr 13.

Abstract

The muscarinic acetylcholine receptor (mAChR) subtype 5 (M5) represents a novel potential target for the treatment of multiple addictive disorders, including opioid use disorder. Through chemical optimization of several functional high-throughput screening hits, VU6019650 (27b) was identified as a novel M5 orthosteric antagonist with high potency (human M5 IC50 = 36 nM), M5 subtype selectivity (>100-fold selectivity against human M1-4) and favorable physicochemical properties for systemic dosing in preclinical addiction models. In acute brain slice electrophysiology studies, 27b blocked the nonselective muscarinic agonist oxotremorine-M-induced increases in neuronal firing rates of midbrain dopamine neurons in the ventral tegmental area, a part of the mesolimbic dopaminergic reward circuitry. Moreover, 27b also inhibited oxycodone self-administration in male Sprague-Dawley rats within a dose range that did not impair general motor output.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Dopaminergic Neurons
  • Male
  • Opioid-Related Disorders*
  • Rats
  • Rats, Sprague-Dawley
  • Receptor, Muscarinic M1
  • Receptor, Muscarinic M5*
  • Receptors, Muscarinic

Substances

  • Receptor, Muscarinic M1
  • Receptor, Muscarinic M5
  • Receptors, Muscarinic