Abstract
Systemic administration of the bacterial endotoxin lipopolysaccharide (LPS) has profound depressive effects on behavior that are mediated by the inducible expression of proinflammatory cytokines such as interleukin-1 (IL-1), IL-6 and tumor necrosis factor-alpha (TNF-alpha) in the brain. To assess the regulatory effects of the anti-inflammatory cytokine IL-13 on LPS-induced sickness behavior, rats injected i.p. with LPS were administered rat recombinant IL-13 i.c.v. IL-13 (300 ng) potentiated the behavioral effects of LPS (125 microg/kg) when both molecules were co-injected. Administration of IL-13 (300 ng) 12 h prior to LPS (150 microg/kg) did not block the depressing effects of LPS on social exploration. These results indicate that IL-13 acts as a proinflammatory cytokine in the brain.
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