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Interaction of the mu-opioid receptor with synaptophysin influences receptor trafficking and signaling

Ying-Jian Liang1, Dai-Fei Wu, Li-Quan Yang

  • 1Department of Pharmacology and Toxicology, Otto-von-Guericke University, Leipziger Str. 44, 39120 Magdeburg, Germany.

Molecular Pharmacology
|September 29, 2006
PubMed

Insights

Synaptophysin binds to and enhances the endocytosis of mu-opioid receptors (MOPr). This interaction influences MOPr trafficking, desensitization, and resensitization, revealing synaptophysin

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Opioid receptor signaling is modulated by associated proteins.
  • Identifying proteins that regulate mu-opioid receptor (MOPr) endocytosis is crucial.

Purpose of the Study:

  • To investigate the role of synaptophysin in MOPr trafficking and signaling.
  • To determine if synaptophysin interacts with and affects MOPr endocytosis.

Main Methods:

  • Yeast two-hybrid assay to identify binding partners.
  • Coimmunoprecipitation and bioluminescence resonance energy transfer (BRET) assays to confirm interactions.
  • Overexpression studies in human embryonic kidney 293 cells to assess functional effects.

Main Results:

  • Synaptophysin binds to MOPr.
  • Overexpression of synaptophysin enhances MOPr endocytosis.
  • Synaptophysin recruits dynamin, facilitating clathrin-coated vesicle fission.
  • A synaptophysin mutant disrupting dynamin interaction prevents MOPr endocytosis.
  • Synaptophysin affects MOPr desensitization and resensitization.

Conclusions:

  • Synaptophysin plays a significant role in regulating MOPr trafficking.
  • Synaptophysin influences MOPr endocytosis and downstream signaling events.
  • The synaptophysin-dynamin interaction is critical for MOPr endocytosis.

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