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Effects of bilateral nephrectomy on endocrine cells of rat stomach [proceedings].

It has previously been shown that in the rat nephrectomy is followed by hypergastrinemia, elevated histidine decarboxylase activity, and lowered histamine content in the gastric mucosa; paradoxically this is accompanied by low gastric acid secretion and lack of response to pentagastrin. The present report deals with the morphological changes in the histamine-containing cells, gastrin (G) cells, and the parietal cells after nephrectomy. The number of gastric enterochromaffin, enterochromaffin-like and G cells was assessed by fluorescence histochemistry. In addition, the concentration of 5-HT in the pyloric mucosa and of histamine in the oxyntic mucosa was determined. Under the fluorescence microscope the enterochromaffin-like cells appeared reduced in number (p < 0.001) corresponding with significant lowering of gastric mucosal histamine content (p < 0.01) after nephrectomy. The number of enterochromaffin cells and gastrin cells was not affected, neither was the 5-HT content. The histamine-containing enter...