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Area of Science:

  • Pharmacology
  • Cell Biology
  • Neuroscience

Background:

  • Opioid receptor function is regulated by post-activation events like endocytosis.
  • The role of endocytosed peptides and processing enzymes in receptor regulation is understudied.
  • Endothelin-converting enzyme 2 (ECE2) processes neuropeptides, including opioid peptides, in intracellular compartments.

Purpose of the Study:

  • To investigate the role of ECE2 in modulating μ opioid receptor recycling and resensitization.
  • To determine if ECE2 activity affects opioid receptor signaling and antinociception.

Main Methods:

  • Inhibition of ECE2 using a selective inhibitor (S136492).
  • Assessment of peptide hydrolysis, μ opioid receptor trafficking (ELISA, microscopy), and receptor signaling (cAMP assay).
  • Evaluation of in vivo antinociception using the tail-flick assay.

Main Results:

  • ECE2 inhibition impaired μ opioid receptor recycling and signaling for ECE2 substrates in various cell types.
  • Inhibition of ECE2 attenuated antinociception mediated by ECE2 substrate opioid peptides.
  • Effects were observed in both heterologous and endogenously expressing cells.

Conclusions:

  • ECE2 selectively processes endogenous opioid peptides in the endocytic compartment.
  • ECE2 plays a significant role in modulating opioid receptor activity and downstream effects like antinociception.