Abstract
The present study was carried out to investigate the effects of Interleukin-1 (IL-1) on gastric pepsin secretion in conscious pylorus-ligated rats. The intraperitoneal (ip) injection of IL-1 resulted in a dose-related inhibition of gastric pepsin output. The intracerebroventricular (icv) injection of IL-1 similarly reduced pepsin secretion at 100 times smaller doses than ip IL-1, suggesting that this inhibitory action of IL-1 is mediated by the central nervous system (CNS). In addition, it was found that the antisecretory action of IL-1, both peripherally and centrally administered, lasted throughout the periods observed (2 hr through 8 hr after injection). These results strongly indicate that IL-1 is involved in the CNS regulation of gastric secretion, especially under certain pathophysiological conditions which activate the immune system to release various cytokines including IL-1.
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