[The role of short chain fatty acids and lactate in regulation of the gastric secretion].

The investigation was carried out in acute experiments by means of isolated stomach perfusion by Ghosh and Shild and in chronic experiments in dogs with fistula of the stomach and duodenum. In rats with intact nervous system lactulose as the source of short chain fatty acids (SCFAs) diminished basal and stimulated by insulin, pentagastrin and histamine gastric acid secretion. By contrast it did not influence carbachol gastric acid secretion. In dogs with intact nervous system lactulose also suppressed the intensity, debit of acid and pepsin of gastric juice stimulated by insulin and histamine. It suggests that the effect of lactulose does not dependent on kinds of animals. Truncal vagotomy removed the inhibitory action of lactulose on pentagastrin and histamine gastric acid secretion in rats. SCFAs and lactic acid suppressed pentagastrin gastric acid secretion in rats. Lactulose, propionate potassium, lactate potassium enhanced the blood glucose level. Truncal vagotomy did not influence the increase of the blood glucose level evoked by lactulose. It is concluded that SCFAs decreases gastric secretion in the third intestinal phase through central inhibition. The mechanism of inhibitory action of lactic and propionic acids depends on their role in the liver gluconeogenesis which leads to increase of the blood glucose level. Hyperglycemia as it is known suppress gastric secretion through diminishing of neural cholinergic activity of nerves vagus.