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Exercise suppresses macrophage antigen presentation.

M A Ceddia1, J A Woods

  • 1Physical Fitness Research Laboratory, Department of Kinesiology, University of Illinois, Urbana, Illinois 61801, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|December 22, 1999
PubMed
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Exhaustive exercise significantly suppresses macrophage antigen presentation to T cells, potentially explaining increased infection risk after overtraining. Moderate exercise showed only a temporary reduction in this immune function.

Area of Science:

  • Immunology
  • Exercise Physiology
  • Cellular Biology

Background:

  • Macrophages (Mphi) play a crucial role in immune response by presenting antigens to T cells.
  • Exercise can modulate immune function, but its specific effects on macrophage antigen presentation (AP) require further elucidation.
  • Understanding exercise-induced changes in Mphi AP is vital for explaining exercise-related infection susceptibility.

Purpose of the Study:

  • To determine the impact of different exercise intensities and durations on macrophage antigen presentation to T cells.
  • To investigate the underlying mechanisms, if any, responsible for exercise-induced alterations in Mphi AP.
  • To correlate findings with the increased incidence of infection observed after strenuous physical activity.

Main Methods:

Related Experiment Videos

  • Balb/c mice were subjected to home cage control, moderate exercise, exhaustive exercise, or treadmill control conditions for 4 days.
  • Peritoneal macrophages were isolated and incubated with chicken ovalbumin (C-OVA).
  • Macrophage-T cell co-cultures were analyzed for interleukin-2 production via ELISA to quantify antigen presentation capacity.

    • Main Results:

    • Exhaustive exercise led to a significant suppression (25-34%) of Mphi AP immediately, 3, and 24 hours post-exercise.
    • Moderate exercise resulted in a transient reduction in Mphi AP only at 3 hours post-exercise.
    • Reductions in Mphi AP were not attributable to changes in Mphi number, viability, or expression of key AP molecules (ICAM-1, B7-2, MHC II).

    Conclusions:

    • Prolonged exhaustive exercise impairs macrophage antigen presentation, potentially contributing to increased susceptibility to infections.
    • Moderate exercise has a less pronounced and more transient effect on Mphi AP.
    • These findings provide a cellular basis for understanding the immune suppression associated with overtraining and prolonged strenuous exercise.