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Related Experiment Videos

Gonadectomy induces site-specific differences in nociception in rats.

J Pajot1, C Ressot, I Ngom

  • 1Recherche Universite D'Auvergne, 11, Bd Charles de Gualle, Clermont-Ferrand, France.

Pain
|July 12, 2003
PubMed
Summary

Ovarian hormones influence pain sensitivity, particularly in the face. Removing these hormones in female rats increased facial pain sensitivity, suggesting a site-specific effect possibly mediated by estrogen receptors in the brainstem and spinal cord.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Pain Research

Background:

  • Chronic orofacial pain is more prevalent in women, with links to ovarian hormone fluctuations.
  • Ovarian hormone effects on nociception (pain sensing) appear more pronounced in the orofacial region compared to other body areas.

Purpose of the Study:

  • To investigate if ovarian hormones affect nociception in a site-specific manner in rats.
  • To determine the role of ovarian hormones in orofacial pain sensitivity.

Main Methods:

  • Gonadectomy (removal of ovaries/testes) or sham surgery was performed on male and female rats.
  • Nociceptive responses were tested using formalin injections in the upper lip and hindpaw.
  • Duration of nociceptive behaviors (rubbing/licking) and estrogen receptor expression were measured.

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Main Results:

  • Gonadectomized female rats showed a significant 54% increase in upper lip rubbing (orofacial pain) but not hindpaw licking.
  • Castrated male rats exhibited a tendency towards increased hindpaw licking but no change in upper lip rubbing.
  • Ovariectomized rats displayed increased estrogen receptor expression in the trigeminal sensory complex and spinal dorsal horn.

Conclusions:

  • The absence of ovarian hormones specifically increases sensitivity to orofacial nociceptive stimulation in female rats.
  • Upregulation of estrogen receptors in the trigeminal nucleus and upper spinal cord may contribute to this heightened orofacial pain sensitivity.