The inhibitory effects of peripheral administration of peptide YY3-36 and glucagon-like peptide-1 on food intake are attenuated by ablation of the vagal-brainstem-hypothalamic pathway

The vagus nerve forms a neuro-anatomical link between the gastrointestinal tract and the brain. A number of gastrointestinal hormones, including cholecystokinin and ghrelin, require an intact vagal-brainstem-hypothalamic pathway to affect CNS feeding circuits. We have shown that the effects of peripheral administration of both peptide YY3-36 (PYY3-36) and glucagon-like peptide-1 (GLP-1) on food intake and activation of hypothalamic arcuate feeding neurones are abolished following either bilateral sub-diaphragmatic total truncal vagotomy or brainstem-hypothalamic pathway transectioning in rodents. These findings suggest that the vagal-brainstem-hypothalamic pathway may also play a role in the effects of circulating PYY3-36 and GLP-1 on food intake.