Related Experiment Video

Updated: Jan 23, 2026

Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
07:23

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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The Emerging Perspective of Morphine Tolerance: MicroRNAs

Teng J Zhang1, Yong Qiu1, Zhen Hua1

  • 1Department of Anesthesiology, Beijing Hospital, National Center of Gerontology, Beijing 100730, China.

Pain Research & Management
|June 12, 2019
PubMed

Insights

MicroRNAs are key regulators in morphine tolerance, impacting gene expression and neuroplasticity. Understanding these noncoding RNAs is crucial for developing new pain management therapies.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • Morphine is a widely used analgesic, but its efficacy is limited by the development of analgesic tolerance.
  • Morphine tolerance, characterized by reduced pain relief and increased dosage requirements, involves complex adaptive changes at multiple biological levels.
  • The precise molecular mechanisms driving morphine tolerance are not fully understood, hindering the development of effective therapeutic strategies.

Purpose of the Study:

  • To review the significant roles of microRNAs in the development of morphine tolerance.
  • To highlight the involvement of microRNAs in regulating gene expression, synaptic plasticity, and neuroplasticity.
  • To identify current limitations in understanding the physiological functions of microRNAs in morphine tolerance.

Main Methods:

  • Literature review of studies investigating microRNA involvement in opioid tolerance.
  • Analysis of research on microRNA regulation of mu opioid receptors (MORs).
  • Examination of evidence linking microRNAs to synaptic, cellular, and circuit-level adaptations.

Main Results:

  • MicroRNAs (noncoding RNAs) are implicated in posttranscriptional gene regulation, affecting MOR expression and function.
  • MicroRNAs play critical roles in modulating synaptic plasticity and neuroplasticity in response to chronic morphine exposure.
  • Evidence suggests microRNAs are integral components of the adaptive processes underlying morphine tolerance.

Conclusions:

  • MicroRNAs represent a significant, yet incompletely understood, layer of regulation in morphine tolerance.
  • Further research into microRNA functions is essential for developing novel therapeutic approaches to manage pain and overcome opioid tolerance.
  • Targeting microRNA pathways may offer a promising strategy to enhance and sustain the analgesic effects of morphine.

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