Gastrin releasing peptides increase Fos-like immunoreactivity in the enteric nervous system and the dorsal vagal complex

► GRP reduces food intake by an incompletely known mechanism. ► We quantified enteric and DVC neurons positive for Fos-LI by GRP. ► GRP-10, -27 and -29 increased Fos-LI in the stomach and area postrema. ► The large forms increased Fos in the myenteric plexus of the duodenum. ► Only GRP-29 increased Fos in the submucosal plexus of the duodenum.