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Background  Pre-treatment with the corticotropin-releasing factor antagonist α-helical CRF9-41 prevents inhibition of gastric emptying by cocaine-and amphetamine-regulated transcript peptide at a dorsal hindbrain level, but its inhibition of sucrose intake is not affected. This is suggestive of separable underlying mechanisms of action in the caudal brainstem for cocaine-and amphetamine-regulated transcript peptide with regard to food intake and gastrointestinal functions. Here we further examine cocaine-and amphetamine-regulated transcript peptide—corticotropin-releasing factor receptor interactions in caudal brainstem controls of solid food intake. Injections of combinations of vehicle, cocaine-and amphetamine-regulated transcript peptide (0.5 μg or 1 μg) or α-helical CRF9-41 were given into the fourth cerebral ventricle of rats. Nocturnal solid food intake was recorded over 22 h.    Results  Pre-treatment with α-helical CRF9-41 into the fourth ventricle significantly increased the responsivity to cocaine-and amphetamine-regulated transcript peptide on hypophagia. In a separate control experiment, α-helical CRF9-41 pre-treatment blocked CRF-induced food intake inhibition indicative of its antagonistic effectiveness.    Conclusions  We conclude that an endogenous Corticotropin-releasing factor agonist may modulate suppression of food intake caused by cocaine-and amphetamine-regulated transcript peptide at a dorsal hindbrain level in the absence of stress. A potential caudal brainstem mechanism whereby cocaine-and amphetamine-regulated transcript peptide effects on food intake is attenuated via corticotropin-releasing factor receptor activity causing tonic inhibition, is suggested.

Pretreatment with a CRF antagonist amplifies feeding inhibition induced by fourth ventricular cocaine- and amphetamine-regulated transcript peptide