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[Histoenzymatic study of the effects of aluminium phosphate on the gastric mucosa (author's transl)].

Gastric biopsies were performed before and after a 1-month aluminium phosphate gel treatment on 12 patients with gastritis or peptic ulcer requiring endoscopy. The sections were stained with various dyes used in histoenzymatic techniques, and colour intensity was evaluated double-blind by means of 0 to 5 scores. Compared with pretreatment levels, there was a statistically significant rise in PAS-toluidine blue activity, which measures mucus secretion (p less than 0.001) and in succinic dehydrogenase activity, an enzyme associated with cell respiration (p less than 0.05). The meaning of these changes is discussed. The mode of action of aluminum phosphate gels on the gastric mucosa remains hypothetical, but a direct contact induction mechanism seems more acceptable than an indirect mechanism involving non-specific reduction in intragastric acidity. Provided the results are statistically evaluated on a sufficient number of samples, PAS-toluidine blue and succinic dehydrogenase stains appear to constitute an easily measurable potential index of intracellular metabolic activity within the gastric mucosa. They could be used as markers to study the efficacy and biochemical mode of action of old and new drugs for gastro-duodenal disorders.