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Structural and functional interactions between six-transmembrane μ-opioid receptors and β2-adrenoreceptors modulate

Alexander Samoshkin1,2, Marino Convertino3, Chi T Viet4

  • 1Alan Edwards Centre for Research on Pain, McGill University, Montreal, QC, H3A 0G1, Canada.

Scientific Reports
|December 15, 2015
PubMed

Insights

The six-transmembrane μ-opioid receptor (6TM-MOR) moves to the cell surface when interacting with β2-adrenergic receptors (β2-ARs). This interaction reveals new opioid signaling pathways and potential therapeutic targets for pain management.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • The μ-opioid receptor (MOR) is the main target for clinical opioids.
  • The MOR gene also produces a six-transmembrane (6TM) isoform with unclear biological roles.

Purpose of the Study:

  • To investigate the cellular localization and function of the 6TM-MOR isoform.
  • To explore the interaction between 6TM-MOR and β2-adrenergic receptors (β2-ARs).

Main Methods:

  • Coexpression of 6TM-MOR and β2-AR in neuroblastoma cells and primary neurons.
  • Assessment of calcium responses to 6TM-MOR ligands.
  • Behavioral studies in rodent models of analgesia and hyperalgesia.

Main Results:

  • 6TM-MOR translocates to the plasma membrane upon coexpression with β2-AR via interaction with its helices 5 and 6.
  • Coexpression potentiates calcium responses to 6TM-MOR ligands, blocked by β2-antagonists.
  • Co-administration of 6TM-MOR and β2-AR ligands shows analgesic synergy and reverses opioid-induced hyperalgesia.

Conclusions:

  • Heterodimerization of 6TM-MOR with β2-AR mediates distinct cellular signaling.
  • This pathway offers a novel mechanism for opioid action and a target for pain therapy, potentially blocking hyperalgesia.

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