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EFFECT OF 5-HT3 ANTAGONIST ONDANSETRON ON WRAP-RESTRAINT AND CONDITIONED EMOTIONAL STRESS INDUCED DEFECATION.

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Area of Science:

  • Pharmacology
  • Gastroenterology
  • Neuroscience

Background:

  • Colonic hypermotility is a common symptom in gastrointestinal disorders.
  • Stress is a known trigger for gastrointestinal dysfunction.
  • Ondansetron is a serotonin 5-HT3 receptor antagonist with antiemetic properties.

Purpose of the Study:

  • To investigate the efficacy of ondansetron in mitigating stress-induced colonic hypermotility in a rat model.
  • To compare the effects of ondansetron in different stress paradigms: wrap-restraint and footshock stress.

Main Methods:

  • Rats were subjected to wrap-restraint stress or conditioned emotional (footshock) stress.
  • Ondansetron was administered subcutaneously at doses of 0.1, 0.5, and 1 mg/kg.
  • Fecal output was measured as an indicator of colonic hypermotility.
  • Diazepam and atropine were used as comparator drugs.

Main Results:

  • Ondansetron dose-dependently reduced fecal output in the wrap-restraint stress model, normalizing it to baseline levels.
  • Ondansetron did not significantly affect the increased fecal output induced by footshock stress.
  • Diazepam and atropine reduced fecal output in both stress models.

Conclusions:

  • Ondansetron demonstrates efficacy in reducing colonic hypermotility associated with physical restraint stress.
  • The anti-hypermotility effects of ondansetron appear to be stress-specific, as it was ineffective against footshock-induced stress.
  • These findings suggest distinct pathways mediating gastrointestinal responses to different types of stress, with implications for ondansetron's therapeutic applications.