[The effects of pirenzepine on regenerating parietal cells].

In this work, we have carried out a stereological and ultrastructural study in order to verify the action of pirenzepine on regenerating parietal cells. We have used a control group and operated or nonoperated groups treated with 1, 5 and 25 mg/kg/day pirenzepine. In operated groups an ulcer was provoked by cauterization with a metallic plate in the gastric fundus. Parietal cells in operated groups showed mitochondria with altered crests, a fine granular matrix and a large number of tubulo-vesicles. The comparative stereological analysis demonstrates a generalized decrease in the mitochondria, canaliculi and lysosomal volume density, and an increase in the tubulo-vesicle volume density. Changes detected in these cellular structures would originate a decrease in the production of HCl [correction of ClH].