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Opioid Receptors: Overview01:22

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Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2, D-Pen5]-enkephalin or DPDPE for...
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Related Experiment Video

Updated: Jun 16, 2026

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

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RACK1, a potential target to decrease morphine reward in mice.

Q F Liu1, X Wang, Q Yuan

  • 1Key Laboratory of Chronobiology, Ministry of Health (Sichuan University), Sichuan University, Chengdu, China.

Archives Italiennes De Biologie
|February 19, 2010
PubMed
Summary
This summary is machine-generated.

Receptor for activated C-kinase 1 (RACK1) protein levels change during morphine reexposure. Overexpressing RACK1 in mice reduced morphine reward and decreased extracellular signal-regulated kinase (ERK) levels, suggesting RACK1 as a potential remedy.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • Morphine reexposure alters protein levels in the brain, including decreased receptor for activated C-kinase 1 (RACK1) in the frontal cortex.
  • RACK1 interacts with key kinases in the extracellular signal-regulated kinase (ERK) pathway, which is implicated in drug reward.

Purpose of the Study:

  • To investigate the impact of RACK1 overexpression on conditioned place preference (CPP) and p-ERK levels in mice undergoing morphine reexposure.
  • To explore the therapeutic potential of RACK1 in mitigating morphine reward.

Main Methods:

  • Mice received subcutaneous morphine injections followed by saline.
  • Following the establishment of place preference, RACK1 was administered via intraventricular injection during morphine reexposure.
  • Conditioned place preference (CPP) was assessed, and p-ERK levels were measured.

Main Results:

  • Morphine reexposure altered RACK1 levels in specific brain regions (frontal cortex, striatum, hippocampus, nucleus accumbens), with these changes reversed by RACK1 administration.
  • RACK1 overexpression significantly decreased p-ERK levels and abolished CPP in morphine-reexposed mice.
  • No significant effects were observed in saline-reexposed mice administered RACK1.

Conclusions:

  • RACK1 plays a critical role in the neurobiological mechanisms underlying morphine reward and reexposure.
  • RACK1 administration effectively reduces morphine-induced CPP and associated ERK pathway activation.
  • RACK1 demonstrates potential as a novel therapeutic agent for treating morphine addiction.