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Int J Sports Med 2011; 32(11): 889-895
DOI: 10.1055/s-0031-1279780
Immunology
Georg Thieme Verlag KG Stuttgart · New York

Freewheel Training Alters Mouse Hippocampal Cytokines

N. Pervaiz
1   University of Waterloo, Health Studies and Gerontology, Waterloo, Ontario, Canada
,
L. Hoffman-Goetz
1   University of Waterloo, Health Studies and Gerontology, Waterloo, Ontario, Canada
› Author Affiliations
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Publication History



accepted after revision 12 May 2011

Publication Date:
11 October 2011 (online)

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Abstract

The effects of 16 weeks of voluntary wheel running in healthy female mice on hippocampal expression of pro-(TNF-α, IL-1β, IL-12) and anti-(IL-10, IL-1ra) inflammatory and pleiotropic (IL-6) cytokines and apoptotic status of specific cell subsets (CD45+, CD11b+) were studied. Mice were assigned to wheel running (WR; n=20) or a control condition (No WR; n=22) and sacrificed after the 16 weeks. Data collected included measures of training status (running volume, body weight, run-to-exhaustion time, and skeletal muscle cytochrome c oxidase activity), flow cytometric analysis of cell phenotypes and apoptosis (CD45+, CD11b+, Annexin+, Annexin+/PI+, PI+), and cytokine concentrations in cell lysates. WR mice had measurable training effects and significantly lower TNF-α (p<0.05) and higher IL-6 (p<0.05), IL-1ra (p<0.05) and IL-12 (p<0.05) expression in the hippocampus compared to controls. IL-1β, IL-10, and the percent of apoptotic and dead cells did not change due to training. Taken together, and in relation to the complex interactions between cytokines, the results suggest a possible mechanism whereby exercise training may buffer from dementia and cognitive decline through changes in the central cytokine milieu in the hippocampus.

Key words

voluntary exercise - hippocampus - microglia - TNF-α - IL-6 - IL-1ra
 

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