Abstract
Release of neurotensin from the small intestine in response to administration of fat directly into the duodenum and ileum was examined in conscious dogs. The present results show that: (1) intraduodenal administration of fat causes a diphasic release of neurotensin which is mediated, at least in part, by cholinergic mechanisms, and (2) both a fatty acid (sodium oleate) and a triglyceride, when infused directly into an isolated ileal loop, stimulate a significant release of neurotensin. Our findings indicate that release of neurotensin is triggered by mechanisms originating in the proximal small intestine and by a direct contact of nutrients with the ileal mucosa.
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