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INFLUENCE OF THE NERVOUS SYSTEM ON THE ACTION OF NEUROTENSIN IN THE SMALL INTESTINE OF RATS

We have reported recently that i.v. infusion of neurotensin (NT) replaces the small intestinal migrating myoelectrical complexes (MMCs), in the small intestine of fasted rats, by irregular spiking activity.’ The motility pattern induced by neurotensin resembles that seen after ingestion of food. In contrast to the effects of neurotensin, several COOHand NH,-fragments of neurotensin do not convert the fasting pattern of the myoelectrical activity, indicating that the effect is produced by the intact neurotensin sequence rather than by small fragments of neurotensin. In the present experiments, the importance of the innervation of the intestine for the effects of NT on the MMCs has been analyzed by means of vagotomy and cholinergic and adrenergic blocking agents.