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Drug-induced Sensitization of Adenylyl Cyclase: Assay Streamlining and Miniaturization for Small Molecule and siRNA Screening Applications
09:39

Drug-induced Sensitization of Adenylyl Cyclase: Assay Streamlining and Miniaturization for Small Molecule and siRNA Screening Applications

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EGFR dependent subcellular communication was responsible for morphine mediated AC superactivation

Hui Zhao1, Gencheng Wu, Xiaoding Cao

  • 1Department of Integrative Medicine and Neurobiology, National Key lab of Medical Neurobiology, Institute of Brain Research Sciences, Shanghai Medical College, Fudan University, PR China. zhaohui07054@fudan.edu.cn

Cellular Signalling
|November 13, 2012
PubMed

Insights

Morphine tolerance and dependence involve EGFR-mediated signaling. Chronic morphine sensitizes EGFR, promoting CRT-MOR tethering and adenylyl cyclase superactivation, crucial for synaptic organization and drug adaptation.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • Compensatory adenylyl cyclase (AC) superactivation is linked to morphine tolerance and dependence.
  • This mechanism involves c-Src-dependent upregulation of AC5 within lipid rafts.

Purpose of the Study:

  • To investigate the role of EGFR signaling in morphine tolerance and dependence.
  • To elucidate the mechanism of CRT-MOR tethering and AC5 superactivation.

Main Methods:

  • Examined EGFR phosphorylation and translocation into the ER following chronic morphine treatment.
  • Investigated the role of EGFR phosphorylation in CRT-MOR tethering within lipid rafts.
  • Assessed the impact of EGFR signaling on AC5 superactivation and synaptic clustering.

Main Results:

  • Chronic morphine treatment sensitized EGFR signaling, increasing EGFR phosphorylation and ER translocation.
  • EGFR phosphorylation was essential for CRT-MOR tethering in lipid rafts, leading to AC5 superactivation.
  • Synaptic clustering of CRT-MOR depended on EGFR phosphorylation, suggesting a role in synaptic organization.

Conclusions:

  • Adaptive changes in MOR and EGFR signaling establish CRT-related subcellular communication.
  • The proposed signaling network within the brain synaptic zone implicates in morphine tolerance and dependence.

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