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Nociception01:44

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Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.
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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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Acute inflammation produces a coordinated set of local and systemic changes that limit injury, eliminate pathogens, and initiate repair. These responses arise within minutes of infection, trauma, or chemical insult and are driven by vascular alterations and leukocyte-derived mediators. When the stimulus resolves, the reaction typically abates within days.Local EffectsAt the site of injury, arteriolar vasodilation increases blood flow, resulting in redness and warmth. Simultaneously, increased...
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Neurokinin 1 (NK1) receptors are distributed across the GI tract, vagal afferents, and key CNS regions including the central vomiting center and chemoreceptor trigger zone (CTZ) Chemotherapy agents stimulate enterochromaffin cells in the gastrointestinal (GI) tract to release large amounts of substance P (SP). SP is a neuropeptide released by specific sensory nerves in response to many different stressors, including those in the GI mucosa affected by chemotherapy.  SP binds and activates...
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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,...
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Development of Recombinant Proteins to Treat Chronic Pain
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Chemokines as peripheral pain mediators.

John M Dawes1, Stephen B McMahon

  • 1Nuffield Department of Clinical Neurosciences, West Wing, Level 6, John Radcliffe Hospital, Oxford OX3 9DU, UK.

Neuroscience Letters
|October 15, 2013
PubMed
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Chemokines, proteins regulating immune cells, may drive chronic pain by sustaining nociceptor activity. Understanding these mediators is key to developing new pain therapies.

Keywords:
ChemokinesHyperalgesiaImmune cellsImmune systemInflammationPeripheral pain mediators

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Area of Science:

  • Neuroscience
  • Immunology
  • Pain Research

Background:

  • Chronic pain often involves ongoing peripheral activity in nociceptors.
  • Peripheral mediators released by damaged tissue are primary drivers of nociceptor activity.
  • Existing analgesics have limited efficacy, suggesting undiscovered pain mediators.

Purpose of the Study:

  • To explore the role of chemokines in sustaining nociceptor activity in persistent pain states.
  • To investigate chemokines as potential therapeutic targets for chronic pain management.

Main Methods:

  • Review of existing evidence on chemokines and nociception.
  • Analysis of the role of chemokines in peripheral pain signaling pathways.

Main Results:

  • Chemokines, known for immune cell regulation, are implicated in abnormal nociceptor activity.
  • Evidence suggests chemokines contribute to the peripheral drive in chronic pain.
  • This points to chemokines as crucial mediators in persistent pain.

Conclusions:

  • Chemokines represent a significant class of mediators involved in chronic pain.
  • Targeting chemokines may offer novel therapeutic strategies for managing persistent pain.
  • Further research into chemokine function in nociception is warranted.