c-Fos Expression in Rat Brain and Brainstem Nuclei in Response to Treatments That Alter Food Intake and Gastric Motility

Molecular and Cellular Neurosciences
B R OlsonJ G Verbalis

Abstract

Expression of the proto-oncogene protein c-Fos was evaluated immunocytochemically in individual brain cells as a marker of treatment-related neuronal activation following pharmacological and physiological treatments that are known to alter food intake and gastric motility in rats. c-Fos expression in response to each treatment was analyzed in the brainstem dorsal vagal complex, the limbic system, and the hypothalamus, representing the areas thought to be involved in coordinating the autonomic, behavioral, and neuroendocrine responses that occur during conditions of stimulated or inhibited food intake. Our results indicate that the patterns of brain c-Fos expression associated with treatments that inhibit food intake differ significantly from the patterns produced by treatments that potentiate food intake. Treatments that inhibited food intake (administration of the anorexigenic agents cholecystokinin, LiCl, and hypertonic saline, and food ingestion following fasting or insulin treatment) were associated with widespread stimulation of c-Fos expression in cells in the nucleus tractus solitarius (NTS), and to a more variable degree the area postrema (AP), but without significant activation of neurons in the dorsal motor nucleus of...Continue Reading

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