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Decrease of gastrointestinal mucosal damage by salicyluric acid compared with salicylic acid in rabbits.

J Nakamura1, M Katayama, M Kido

  • 1School of Pharmaceutical Sciences, Nagasaki University, Japan.

The Journal of Pharmacy and Pharmacology
|November 1, 1991
PubMed
Summary
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Salicyluric acid causes less gastrointestinal damage than salicylic acid in rabbits. Intestinal microbes metabolize salicyluric acid to salicylic acid, suggesting prodrugs could reduce stomach irritation.

Area of Science:

  • Gastroenterology
  • Pharmacology
  • Microbiology

Background:

  • Salicylic acid is a common NSAID known to cause gastrointestinal mucosal damage.
  • Salicyluric acid is a metabolite of aspirin, but its direct effects on gastrointestinal mucosa are less understood.

Purpose of the Study:

  • To compare the gastrointestinal mucosal damage induced by oral administration of salicylic acid versus salicyluric acid in rabbits.
  • To investigate the potential of salicyluric acid as a prodrug to mitigate gastrointestinal side effects.

Main Methods:

  • Oral administration of salicylic acid and salicyluric acid to rabbits.
  • Scanning electron microscopy examination of gastric and intestinal mucosal tissues at 6 and 24 hours post-administration.
  • Comparison of morphological changes between treatment groups and control.

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Main Results:

  • Salicylic acid treatment led to significant gastric mucosal damage at 6 and 24 hours.
  • Salicyluric acid treatment resulted in minimal severe damage to the gastric mucosa after 24 hours.
  • While salicylic acid caused some duodenal, jejunal, and ileal damage, salicyluric acid showed minimal impact on the surface character of these and other intestinal tissues.

Conclusions:

  • Salicyluric acid exhibits a significantly better gastrointestinal safety profile compared to salicylic acid.
  • The metabolism of salicyluric acid to salicylic acid by intestinal microorganisms may play a role in its reduced toxicity.
  • Prodrug strategies utilizing salicyluric acid's metabolic pathway could offer a way to reduce NSAID-induced gastrointestinal damage.