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Identification and characterization of novel candidate compounds targeting 6- and 7-transmembrane μ-opioid receptor isoforms.

Publication ,  Journal Article
Muralidharan, A; Samoshkin, A; Convertino, M; Piltonen, MH; Gris, P; Wang, J; Jiang, C; Klares, R; Linton, A; Ji, R-R; Maixner, W; Mogil, JS ...
Published in: Br J Pharmacol
July 2021

BACKGROUND AND PURPOSE: The μ-opioid receptor (μ receptor) is the primary target for opioid analgesics. The 7-transmembrane (TM) and 6TM μ receptor isoforms mediate inhibitory and excitatory cellular effects. Here, we developed compounds selective for 6TM- or 7TM-μ receptors to further our understanding of the pharmacodynamic properties of μ receptors. EXPERIMENTAL APPROACH: We performed virtual screening of the ZINC Drug Now library of compounds using in silico 7TM- and 6TM-μ receptor structural models and identified potential compounds that are selective for 6TM- and/or 7TM-μ receptors. Subsequently, we characterized the most promising candidate compounds in functional in vitro studies using Be2C neuroblastoma transfected cells, behavioural in vivo pain assays using various knockout mice and in ex vivo electrophysiology studies. KEY RESULTS: Our virtual screen identified 30 potential candidate compounds. Subsequent functional in vitro cellular assays shortlisted four compounds (#5, 10, 11 and 25) that demonstrated 6TM- or 7TM-μ receptor-dependent NO release. In in vivo pain assays these compounds also produced dose-dependent hyperalgesic responses. Studies using mice that lack specific opioid receptors further established the μ receptor-dependent nature of identified novel ligands. Ex vivo electrophysiological studies on spontaneous excitatory postsynaptic currents in isolated spinal cord slices also validated the hyperalgesic properties of the most potent 6TM- (#10) and 7TM-μ receptor (#5) ligands. CONCLUSION AND IMPLICATIONS: Our novel compounds represent a new class of ligands for μ receptors and will serve as valuable research tools to facilitate the development of opioids with significant analgesic efficacy and fewer side-effects.

Duke Scholars

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Published In

Br J Pharmacol

DOI

EISSN

1476-5381

Publication Date

July 2021

Volume

178

Issue

13

Start / End Page

2709 / 2726

Location

England

Related Subject Headings

  • Receptors, Opioid, mu
  • Protein Isoforms
  • Pharmacology & Pharmacy
  • Pain
  • Mice, Knockout
  • Mice
  • Animals
  • Analgesics, Opioid
  • 3214 Pharmacology and pharmaceutical sciences
  • 1115 Pharmacology and Pharmaceutical Sciences
 

Citation

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Muralidharan, A., Samoshkin, A., Convertino, M., Piltonen, M. H., Gris, P., Wang, J., … Diatchenko, L. (2021). Identification and characterization of novel candidate compounds targeting 6- and 7-transmembrane μ-opioid receptor isoforms. Br J Pharmacol, 178(13), 2709–2726. https://doi.org/10.1111/bph.15463
Muralidharan, Arjun, Alexander Samoshkin, Marino Convertino, Marjo Hannele Piltonen, Pavel Gris, Jian Wang, Changyu Jiang, et al. “Identification and characterization of novel candidate compounds targeting 6- and 7-transmembrane μ-opioid receptor isoforms.Br J Pharmacol 178, no. 13 (July 2021): 2709–26. https://doi.org/10.1111/bph.15463.
Muralidharan A, Samoshkin A, Convertino M, Piltonen MH, Gris P, Wang J, et al. Identification and characterization of novel candidate compounds targeting 6- and 7-transmembrane μ-opioid receptor isoforms. Br J Pharmacol. 2021 Jul;178(13):2709–26.
Muralidharan, Arjun, et al. “Identification and characterization of novel candidate compounds targeting 6- and 7-transmembrane μ-opioid receptor isoforms.Br J Pharmacol, vol. 178, no. 13, July 2021, pp. 2709–26. Pubmed, doi:10.1111/bph.15463.
Muralidharan A, Samoshkin A, Convertino M, Piltonen MH, Gris P, Wang J, Jiang C, Klares R, Linton A, Ji R-R, Maixner W, Dokholyan NV, Mogil JS, Diatchenko L. Identification and characterization of novel candidate compounds targeting 6- and 7-transmembrane μ-opioid receptor isoforms. Br J Pharmacol. 2021 Jul;178(13):2709–2726.
Journal cover image

Published In

Br J Pharmacol

DOI

EISSN

1476-5381

Publication Date

July 2021

Volume

178

Issue

13

Start / End Page

2709 / 2726

Location

England

Related Subject Headings

  • Receptors, Opioid, mu
  • Protein Isoforms
  • Pharmacology & Pharmacy
  • Pain
  • Mice, Knockout
  • Mice
  • Animals
  • Analgesics, Opioid
  • 3214 Pharmacology and pharmaceutical sciences
  • 1115 Pharmacology and Pharmaceutical Sciences