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We examined the effect of ammonia on the gastric mucosal barrier by measuring the changes in transmucosal fluxes of H+, Na+ and K+. In rats, ammonia at concentrations of 0.1 to 0.5% increased the H+ loss from the lumen and 0.2 to 0.5% concentrations of ammonia increased both Na+ and K+ influxes into the lumen. In dogs, in an exactly similar manner to rats, ammonia at concentrations of 0.1 to 0.5% increased H+ loss, and ammonia at concentration of 0.5% increased both Na+ and K+ influxes into the lumen. These results suggest that ammonia breaks the gastric mucosal barrier.
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