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Related Experiment Videos

Orexin-A, an hypothalamic peptide with analgesic properties.

S Bingham1, P T Davey, A J Babbs

  • 1Neuroscience Research, SmithKline Beecham Pharmaceuticals, New Frontiers Science Park North, 3rd Avenue, Essex CM19 5AW, Harlow, UK. sharon_bingham-l@sbphrd.com

Pain
|April 27, 2001
PubMed
Summary

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The orexinergic system, involving orexin-A, plays a role in pain modulation. Orexin-A demonstrated analgesic effects, distinct from the opiate system, in pain models.

Area of Science:

  • Neuroscience
  • Pain Research
  • Pharmacology

Background:

  • The hypothalamic peptide orexin-A and its receptor are implicated in pain processing.
  • Localization of orexin-A and orexin-1 receptor in the spinal cord and dorsal root ganglion is relevant to nociception.

Purpose of the Study:

  • To investigate the role of orexin-A and the orexin-1 receptor in nociceptive transmission.
  • To determine the analgesic efficacy and mechanism of orexin-A in pain models.

Main Methods:

  • Confirmed localization of orexin-A and orexin-1 receptor in the spinal cord and dorsal root ganglion.
  • Administered orexin-A intravenously (i.v.) and subcutaneously (s.c.) in mouse and rat models of nociception and hyperalgesia.
  • Utilized hotplate and carrageenan-induced hyperalgesia tests, along with orexin-1 receptor antagonist SB-334867 and naloxone to assess mechanisms.

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Main Results:

  • Orexin-A produced analgesia when administered i.v. but not s.c., comparable to morphine in certain pain tests.
  • The analgesic effects of orexin-A were blocked by the orexin-1 receptor antagonist SB-334867, not naloxone, indicating no opiate system involvement.
  • Orexin-1 receptor antagonists showed pro-hyperalgesic effects under inflammatory conditions, suggesting a tonic inhibitory role.

Conclusions:

  • The orexinergic system, through orexin-A and orexin-1 receptors, modulates nociceptive transmission.
  • Orexin-A possesses analgesic properties independent of the opiate system.
  • A tonic inhibitory orexin drive may exist in certain inflammatory pain states.