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Physical Fitness Research Laboratory, Department of Kinesiology, University of Illinois, Urbana, Illinois 61801
This study
determined the effects of exercise on the ability of macrophages (M
)
to present antigen to T cells. Pathogen-free male Balb/c mice (8 ± 2 wk of age) were randomly assigned to either home cage control, moderate exercise (Mod; 18 m/min, 5% grade, 0.5 h/day), exhaustive exercise (Exh, 18-30 m/min, 3 h/day), or treadmill control groups. The mice underwent treatments for 4 days
during peritoneal thioglycolate inflammation. Peritoneal M
were
harvested, purified, and incubated with chicken ovalbumin (C-OVA;
0-10 mg/ml) for 18 h. M
were then cocultured with
C-OVA-specific T cells for 48 h, and the supernatants were analyzed via
ELISA for interleukin-2 as an indication of M
antigen presentation (AP). Exh exhibited suppressed (~25-34%) M
AP across a wide
range of C-OVA doses when measured immediately, 3, and 24 h
postexercise. In contrast, Mod had reduced M
AP only at 3 h
postexercise. M
AP was also lower in the treadmill control
(4-27%) compared with the home cage control group, but was
significantly higher than Exh. The reduction in M
AP was not due to
exercise-induced differences in M
number, percentage, or expression
of intercellular adhesion molecule-1, B7-2, or major
histocompatability complex II, molecules important in AP. In
conclusion, our data lend evidence that may help explain the increased
incidence of infection observed after prolonged exhaustive exercise or overtraining.
immunity; stress; T lymphocytes; interleukin-2; mice; intercellular adhesion molecule-1
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