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Analgesia and Pain Management01:25

Analgesia and Pain Management

Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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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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Pain01:20

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The Sciatic Nerve Cuffing Model of Neuropathic Pain in Mice
07:09

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Published on: July 16, 2014

Opioids and sensory nerves.

Christoph Stein1, Christian Zöllner

  • 1Klinik für Anaesthesiologie und operative Intensivmedizin, Freie Universität Berlin, Charité - Campus Benjamin Franklin, 12200 Berlin, Germany. christoph.stein@charite.de

Handbook of Experimental Pharmacology
|August 6, 2009
PubMed
Summary

Peripheral opioid receptors in sensory neurons are upregulated during inflammation, enhancing pain relief. Leukocytes release endogenous opioids, activating these receptors for localized analgesia without central side effects.

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Area of Science:

  • Neuroscience
  • Immunology
  • Pharmacology

Background:

  • Opioid receptors are expressed in sensory neurons.
  • Inflammation affects opioid receptor expression and function.
  • Leukocytes are a source of endogenous opioid ligands.

Purpose of the Study:

  • To review opioid receptor expression and regulation in sensory neurons.
  • To examine interactions between opioid receptors and ligands.
  • To understand the enhanced analgesic efficacy of peripheral opioids during inflammation.

Main Methods:

  • Review of scientific literature on opioid receptors, sensory neurons, and inflammation.
  • Analysis of molecular mechanisms of opioid receptor regulation.
  • Investigation of leukocyte-mediated opioid release and action.

Main Results:

  • Peripheral inflammation upregulates opioid receptors in sensory neurons.
  • Leukocytes synthesize and release endogenous opioids in inflamed tissues.
  • Peripheral opioid receptor activation by endogenous or exogenous ligands provides analgesia without central side effects.

Conclusions:

  • Peripheral opioid systems offer a promising avenue for pain management.
  • Targeting leukocyte-derived opioids and peripheral receptors may yield novel analgesics.
  • Future research aims to develop peripherally restricted opioids and targeted delivery systems.