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Updated: Dec 27, 2025

Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
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Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities

Published on: July 29, 2014

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MicroRNA-146a attenuates the development of morphine analgesic tolerance in a rat model

Ying Wang1, Wei Jiang1, Bin Xia1

  • 1Department of Anesthesiology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, Shandong, China.

Neurological Research
|March 6, 2020
PubMed

Insights

MicroRNA 146a (miR-146a) reduces morphine tolerance by downregulating IRAK1/TRAF6 in the TLR4 pathway. This finding offers a potential strategy to overcome morphine resistance in pain management.

Area of Science:

  • Pharmacology
  • Molecular Biology
  • Pain Research

Background:

  • Morphine is crucial for severe pain relief but long-term use causes drug resistance.
  • MicroRNA 146a (miR-146a) is a known negative regulator in morphine tolerance.
  • Understanding miR-146a's role is key to addressing morphine resistance.

Purpose of the Study:

  • To investigate the effect of miR-146a on the development of morphine analgesic tolerance.
  • To elucidate the molecular mechanisms underlying miR-146a's influence on morphine tolerance.

Main Methods:

  • Established a morphine-tolerant rat model through continuous morphine administration.
  • Assessed pain sensitivity using the paw withdrawal latency test.
  • Analyzed miR-146a, IRAK1, and TRAF6 expression in spinal cord tissue via Q-PCR and Western blotting.

Main Results:

  • Morphine-tolerant rats exhibited significantly decreased miR-146a expression.
  • Overexpression of miR-146a reduced morphine resistance and downregulated IRAK1/TRAF6 in the TLR4 pathway.
  • Inhibition of miR-146a decreased pain latency and increased IRAK1/TRAF6 expression.

Conclusions:

  • miR-146a attenuates morphine tolerance by inhibiting IRAK1/TRAF6 within the TLR4 pathway.
  • This mechanism provides a potential target for managing morphine resistance.
  • Findings offer an experimental basis for addressing morphine resistance issues in clinical practice.
Keywords:
IRAK1TLR4TRAF6miR-146amorphine

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