DRUG ABSORPTION FROM THE GASTROINTESTINAL TRACT AND IMMUNITY : THE MECHANISM OF THE DECREASED ABSORPTION OF SALICYLIC ACID DURING SYSTEMIC ANAPHYLAXIS.I

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Previous studies have demonstrated the decrease of intestinal salicylic acid absorption in ovalbumin-immunized rats during systemic anaphylaxis. In the present study, the mechanism whereby systemic anaphylaxis interferes with the intestinal absorption of salicylic acid was studied. The pH of the luminal solution was not affected by the intravenous challenge with ovalbumin. A significant increase of the intraluminal protein was observed in rats under systemic anaphylaxis. However, there was no significant difference between ovalbumin-treated rats and saline-treated ones on the binding of salicylic acid with intraluminal macromolecular substances. Enhanced mucus release in the perfusate was also observed in sensitized rats but the extent of decrease in absorption of salicylic acid did not correlate with the increase in amount of the intraluminal mucus in the same animals. In addition, no significant effect was observed on the uptake by the intestinal everted sac of rats with systemic anaphylaxis. These findings suggested that mucus as well as protein is not responsible for the decrease of absorption of salicylic acid induced by systemic anaphylaxis. From these observations, it would appear that the circulatory changes in the gastrointestinal tract may play an important role in the decreased absorption of salicylic acid during systemic anaphylaxis.
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