JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Repeated exercise in mice alters expression of IL-10 and TNF-alpha in intestinal lymphocytes.

Intestinal inflammation is characterized by mucosal damage that may arise, in part, to imbalances in pro- and anti-inflammatory cytokines. The purpose of this study was to describe the effects of repeated bouts of strenuous exercise on cytokine expression in mouse intestinal lymphocytes (IL). Thirty-four female C57BL/6 mice were randomly assigned to three groups: three repeated bouts of treadmill running separated by 24h followed by sacrifice immediately or after a 24h period or a sedentary (no exercise) control. The pro-inflammatory cytokine, TNF-alpha, and the anti-inflammatory cytokine, IL-10, were measured in IL by Western blotting. IL-10 concentration increased by 48% (p<0.05) in the immediate group compared to the sedentary control. TNF-alpha levels in mouse IL were significantly lower 24h after completion of the exercise protocol compared to the immediate group (p<0.05). The results suggest a possible physiological compensation in which intestinal lymphocytes increase the expression of IL-10 in response to exercise-induced stress.

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