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The anti-inflammatory cytokine interleukin (IL)-10 is important for regulating inflammation in the periphery and brain, but whether it protects against infection- or age-related psychomotor disturbances and fatigue is unknown. Therefore, the present study evaluated motor coordination, time to fatigue, and several central and peripheral proinflammatory cytokines in male young adult (3-mo-old) and middle-aged (12-mo-old) wild-type (IL-10(+/+)) and IL-10-deficient (IL-10(-/-)) mice after intraperitoneal injection of lipopolysaccharide (LPS) or saline. No age-related differences were observed; therefore, data from the two ages were pooled and analyzed to determine effects of genotype and treatment. LPS treatment increased IL-1beta, IL-6, and TNFalpha mRNA in all brain areas examined in IL-10(+/+) and IL-10(-/-) mice, but to a greater extent and for a longer time in IL-10(-/-) mice. Plasma IL-1beta and IL-6 were increased similarly in IL-10(+/+) and IL-10(-/-) mice 4 h after LPS but remained elevated longer in IL-10(-/-) mice, whereas TNFalpha was higher in IL-10(-/-) mice throughout after LPS treatment. Motor performance and motor learning in IL-10(+/+) mice were not affected by LPS treatment; however, both were reduced in IL-10(-/-) mice treated with LPS compared with those treated with saline. Furthermore, although LPS reduced the time to fatigue in IL-10(+/+) and IL-10(-/-) mice, the effects were exacerbated in IL-10(-/-) mice. Thus the increased brain and peripheral inflammation induced by LPS in IL-10(-/-) mice was associated with increased coordination deficits and fatigue. These data suggest that IL-10 may inhibit motor deficits and fatigue associated with peripheral infections via its anti-inflammatory effects.

american journal of physiology. regulatory, integrative and comparative physiology/american journal of physiology. regulatory, integrative, and comparative physiology

Exacerbated fatigue and motor deficits in interleukin-10-deficient mice after peripheral immune stimulation