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Gender-dependent effect on nociceptive response induced by chronic variable stress.

G D Gamaro1, I L S Torres2, G Laste2

  • 1Departamento de Bioquímica, Centro de Ciências Químicas, Farmacêuticas e de Alimentos, UFPel, Campus Capão do Leão S/N, Prédio 29 sala 303 Caixa Postal 354, 96010-900, Pelotas, RS, Brazil.

Physiology & Behavior
|June 8, 2014
PubMed
Summary

Chronic variable stress impacts pain sensitivity differently in male and female rats. Male rats showed increased pain sensitivity (hyperalgesia), while females exhibited reduced pain sensitivity (analgesia).

Keywords:
Chronic variable stressEstrous cycleGenderNociceptionRatsStress

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Area of Science:

  • Neuroscience
  • Behavioral Science
  • Endocrinology

Background:

  • Stress-induced hyperalgesia is a known phenomenon.
  • Previous studies indicated sex differences in stress responses, with males showing hyperalgesia and females not.
  • The influence of the estrous cycle on these responses remained unclear.

Purpose of the Study:

  • To investigate the sex-specific effects of chronic variable stress (CVS) on nociception.
  • To determine if the estrous cycle influences stress-induced changes in pain perception in female rats.
  • To compare the nociceptive responses of male and female rats to prolonged stress.

Main Methods:

  • Adult male and female rats were subjected to chronic variable stress for 40 days.
  • Nociception threshold was measured using the tail-flick latency test.
  • The estrous cycle phase was monitored in female rats.

Main Results:

  • Chronically stressed male rats exhibited a significant decrease in tail-flick latency, indicating hyperalgesia.
  • Chronically stressed female rats showed a significant increase in tail-flick latency, indicating analgesia.
  • The observed analgesic effect in females was independent of their estrous cycle phase.

Conclusions:

  • Chronic variable stress induces sexually dimorphic changes in nociception.
  • Male rats develop stress-induced hyperalgesia, while females show stress-induced analgesia.
  • The estrous cycle does not appear to modulate stress-induced analgesia in female rats, suggesting other mechanisms are involved.