The G-protein-biased agents PZM21 and TRV130 are partial agonists of μ-opioid receptor-mediated signalling to ion channels

Yevgen Yudin, Tibor Rohacs

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Background and Purpose: Opioids remain the most efficient medications against severe pain; they act on receptors that couple to heterotrimeric G-proteins in the Gαi/o family. Opioids exert many of their acute effects through modulating ion channels via Gβγ subunits. Many of their side effects are attributed to β-arrestin recruitment. Several biased agonists that do not recruit β-arrestins, but activate G-protein-dependent pathways, have recently been developed. While these compounds have been proposed to be full agonists of G-protein signalling in several high throughput pharmacological assays, their effects were not studied on ion channel targets. Experimental Approach: Here, we used patch-clamp electrophysiology and Ca2+ imaging to test the effects of TRV130, PZM21, and herkinorin, three G-protein-biased agonists of μ-opioid receptors, on ion channel targets of Gαi/o/Gβγ signalling. We also studied G-protein dissociation using a FRET-based assay. Key Results: All three biased agonists induced smaller activation of G-protein-coupled inwardly rectifying K+ channels (Kir3.2) and smaller inhibition of transient receptor potential melastatin (TRPM3) channels than the full μ receptor agonist DAMGO. Co-application of TRV130 or PZM21, but not herkinorin, alleviated the effects of DAMGO on both channels. PZM21 and TRV130 also decreased the effect of morphine on Kir3.2 channels. The CaV2.2 channel was also inhibited less by PZM21 and TRV130 than by DAMGO. We also found that TRV130, PZM21, and herkinorin were less effective than DAMGO at inducing dissociation of the Gαi/Gβγ complex. Conclusion and Implications: TRV130, PZM21, and potentially herkinorin are partial agonists of μ receptors.

Original languageEnglish (US)
Pages (from-to)3110-3125
Number of pages16
JournalBritish Journal of Pharmacology
Volume176
Issue number17
DOIs
StatePublished - 2019

All Science Journal Classification (ASJC) codes

  • Pharmacology

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