Facilitation of μ-Opioid Receptor Activity by Preventing δ-Opioid Receptor-Mediated Codegradation

نویسندگان

  • Shao-Qiu He
  • Zhen-Ning Zhang
  • Ji-Song Guan
  • Hong-Rui Liu
  • Bo Zhao
  • Hai-Bo Wang
  • Qian Li
  • Hong Yang
  • Jie Luo
  • Zi-Yan Li
  • Qiong Wang
  • Ying-Jin Lu
  • Lan Bao
  • Xu Zhang
چکیده

δ-opioid receptors (DORs) form heteromers with μ-opioid receptors (MORs) and negatively regulate MOR-mediated spinal analgesia. However, the underlying mechanism remains largely unclear. The present study shows that the activity of MORs can be enhanced by preventing MORs from DOR-mediated codegradation. Treatment with DOR-specific agonists led to endocytosis of both DORs and MORs. These receptors were further processed for ubiquitination and lysosomal degradation, resulting in a reduction of surface MORs. Such effects were attenuated by treatment with an interfering peptide containing the first transmembrane domain of MOR (MOR(TM1)), which interacted with DORs and disrupted the MOR/DOR interaction. Furthermore, the systemically applied fusion protein consisting of MOR(TM1) and TAT at the C terminus could disrupt the MOR/DOR interaction in the mouse spinal cord, enhance the morphine analgesia, and reduce the antinociceptive tolerance to morphine. Thus, dissociation of MORs from DORs in the cell membrane is a potential strategy to improve opioid analgesic therapies.

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عنوان ژورنال:
  • Neuron

دوره 69  شماره 

صفحات  -

تاریخ انتشار 2011