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P2X receptors and nociception.

B A Chizh1, P Illes

  • 1Department of Pharmacology, Grünenthal GmbH Research Centre, Aachen, Germany.

Pharmacological Reviews
|December 6, 2001
PubMed
Summary

Peripheral P2X receptors, particularly P2X(3) and P2X(2/3) subtypes, are key targets for novel analgesics. Targeting these receptors may offer new pain relief strategies by blocking ATP-mediated nociception.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Pain Research

Background:

  • Adenosine triphosphate (ATP) acts as a signaling molecule in pain pathways.
  • P2X receptors, ionotropic ATP receptors, are implicated in nociception.
  • ATP release occurs in various pain states, suggesting a role for P2X receptors.

Purpose of the Study:

  • To investigate the distinct roles of P2X receptors in central and peripheral pain mechanisms.
  • To identify specific P2X receptor subtypes involved in nociception.
  • To evaluate the therapeutic potential of targeting P2X receptors for pain management.

Main Methods:

  • Review of recent findings on P2X receptor involvement in pain.
  • Analysis of in vivo studies on peripheral and central ATPergic mechanisms.
  • Examination of evidence linking ATP and P2X receptors to visceral and neuropathic pain.

Main Results:

  • Peripheral ATP excites nociceptive afferents via homomeric P2X(3) or heteromeric P2X(2/3) receptors.
  • Central P2X receptors (e.g., P2X(2), P2X(4), P2X(6)) modulate central pain transmission.
  • Peripheral ATPergic mechanisms are crucial in acute injury and inflammation.

Conclusions:

  • Peripheral P2X receptors, especially P2X(3) and P2X(2/3), are promising targets for analgesics.
  • Developing selective P2X receptor antagonists for systemic use is a potential strategy for novel pain therapies.
  • Further research is needed to clarify the role of ATP in visceral and neuropathic pain.

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