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The behavioral effects of peripherally administered interleukin-1beta (IL-1beta) are mediated by the production of cytokines and other proinflammatory mediators at the level of the blood-brain interface and by activation of neural pathway. To assess whether this action is mediated by NFkappaB activation, rats were injected into the lateral ventricle of the brain with a specific inhibitor of NFkappaB activation, the NEMO Binding Domain (NBD) peptide that has been shown previously to abolish completely IL-1beta-induced NFkappaB activation and Cox-2 synthesis in the brain microvasculature. NFkappaB pathway inactivation significantly blocked the behavioral effects of intraperitoneally administered IL-1beta in the form of social withdrawal and decreased food intake, and dramatically reduced IL-1beta-induced c-Fos expression in various brain regions as paraventricular nucleus, supraoptic nucleus, and lateral part of the central amygdala. These findings strongly support the hypothesis that IL-1beta-induced NFkappaB activation at the blood-brain interface is a crucial step in the transmission of immune signals from the periphery to the brain that underlies further events responsible of sickness behavior.

Inactivation of the Cerebral NFκB Pathway Inhibits Interleukin-1β-Induced Sickness Behavior and c-Fos Expression in Various Brain Nuclei