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Am J Physiol Cell Physiol 280: C769-C774, 2001;
0363-6143/01 $5.00
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Vol. 280, Issue 4, C769-C774, April 2001

Circulating monocytes are not the source of elevations in plasma IL-6 and TNF-alpha levels after prolonged running

R. L. Starkie1, J. Rolland2, D. J. Angus1, M. J. Anderson1, and M. A. Febbraio1

1 Exercise Physiology and Metabolism Laboratory, Department of Physiology, University of Melbourne, Parkville 3052, Victoria; and 2 Department of Pathology and Immunology, Monash Medical School, Prahran 3181, Victoria, Australia

The present study was undertaken to examine the effect of prolonged running on monocyte intracellular cytokine production and plasma cytokine concentration. Blood samples were collected 1 h before, immediately after, 2 h after, and 24 h after a competitive marathon run. There was no change in the number of cells spontaneously producing tumor necrosis factor (TNF)-alpha ; however, there was a decrease in the number of cells producing interleukin (IL)-1alpha and IL-6 (P < 0.01) postexercise. In contrast, there was an increase in the number of monocytes that responded to lipopolysaccharide stimulation by producing IL-1alpha , TNF-alpha , and IL-6 (P < 0.01) immediately and 2 h postexercise; however, these cells contained less cytokine (P < 0.05). Plasma IL-6, TNF-alpha , epinephrine, norepinephrine, and cortisol concentrations were markedly increased (P < 0.01) postexercise. These data demonstrate that circulating monocytes are not the source of elevated levels of plasma IL-6 and TNF-alpha after prolonged running. In addition, it is likely that stress hormones result in a decrease in the amount of cytokine produced by LPS-stimulated cells postexercise.

flow cytometry; epinephrine; cortisol


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