Abstract
The aim of the present study was to investigate the mode of the inhibitory effect of somatostatin on gastric acid secretion. This was done in Heidenhain-pouch dogs studying the effect of somatostatin on cumulative dose response curves of pentagastrin, carbachol and histamine. Somatostatin inhibited gastric secretion after all three stimuli, with decreasing potency against carbachol, pentagastrin and histamine. The pentagastrin-stimulated acid secretion was inhibited in a noncompetitive way; in contrary to this the carbachol and also the histamine-stimulated secretion was inhibited in a competitive way.
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