[The significance of human gastric juice gastrin to acid secretion (author's transl)].

Gastrin 1--17 protected against physiological proteolysis does not change gastric acid secretion and serum gastrin level even if present in the duodenal and gastric lumen in excessive amounts. Consequently gastric juice gastrin has no local effect on the parietal cell. There is no measurable resorption of gastrin from the gastric or duodenal lumen. Gastrin 1--17 does not liberate endogenous gastrin from the antral and duodenal mucosa. Thus, an indirect systemic influence of gastric juice gastrin on the function of the parietal cell can be excluded. Gastric juice gastrin seems to be a waste-product of a bidirectional G-cell secretion. Gel filtration and starch block electrophoresis revealed considerable amounts of immunoreactive material in the duodenal perfusate resembling gastrin 1--34. Thus, the duodenal G-cells seem to liberate gastrin into the duodenal lumen.