Abstract
The effect of leptin on gastric emptying of glucose was studied in freely moving rats bearing intragastric fistulas. Leptin (0.39 microg and 3.9 microg) injected into the fourth ventricle inhibited gastric emptying significantly, whereas s.c. administration of leptin (10 microg/kg) had no effect. Leptin receptor immunoreactivity, revealed by an antiserum that recognizes all leptin receptor isoforms, was demonstrated in choline acetyltransferase (ChAT)-containing neurones of the dorsal motor nucleus of the vagus nerve (DMX). The data indicate that leptin acts centrally to suppress gastric emptying possibly via leptin receptors located on cholinergic DMX neurones.
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