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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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Related Experiment Video

Updated: Apr 29, 2026

The Spared Nerve Injury SNI Model of Induced Mechanical Allodynia in Mice
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The Spared Nerve Injury SNI Model of Induced Mechanical Allodynia in Mice

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Mechanical allodynia.

Stéphane Lolignier1, Niels Eijkelkamp, John N Wood

  • 1Molecular Nociception Group, Wolfson Institute for Biomedical Research, University College London, London, WC1E 6BT, UK, s.lolignier@ucl.ac.uk.

Pflugers Archiv : European Journal of Physiology
|May 22, 2014
PubMed
Summary

Mechanical allodynia causes pain from light touch and lacks protective value. Understanding its complex mechanisms, involving nerve damage and channels like Piezo2, is crucial for developing effective treatments.

Area of Science:

  • Neuroscience
  • Pain Research

Background:

  • Mechanical allodynia involves pain from non-painful stimuli, unlike protective inflammatory hyperalgesia.
  • This condition is linked to nerve damage (e.g., diabetes) and presents a growing clinical challenge.

Purpose of the Study:

  • To review the underlying mechanisms of mechanical allodynia.
  • To explore the roles of mechanosensitive channels (e.g., Piezo2) and nervous system pathways in allodynia.

Main Methods:

  • Literature review of current research on mechanical allodynia.
  • Examination of evidence implicating peripheral and central nervous system mechanisms.

Main Results:

  • Evidence suggests involvement of mechanosensitive channels like Piezo2.

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  • Peripheral and central nervous system alterations contribute to allodynia.

    • Conclusions:

    • The mechanistic basis of allodynia is complex and incompletely understood.
    • Multiple redundant mechanisms, including altered mechanotransduction and CNS changes, complicate therapeutic interventions.