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Am J Physiol Regul Integr Comp Physiol 274: R1454-R1459, 1998;
0363-6119/98 $5.00
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Vol. 274, Issue 5, R1454-R1459, May 1998

Exercise effects on lung tumor metastases and in vitro alveolar macrophage antitumor cytotoxicity

J. M. Davis, M. L. Kohut, D. A. Jackson, L. H. Colbert, E. P. Mayer, and A. Ghaffar

Department of Exercise Science, School of Public Health; and Department of Microbiology and Immunology, School of Medicine, University of South Carolina, Columbia, South Carolina 29208

This study examined the effects of moderate and prolonged exercise on 1) lung tumor metastases and 2) alveolar macrophage antitumor response in vitro. C57Bl/6 mice were assigned to either Ex-30 (30-min run), Ex-F (run to fatigue), Ex-F-24 h (run to fatigue 24 h before tumor injection), or Con (rested in lanes above the treadmill). Mice received intravenous injections of syngeneic B16 melanoma cells 30 min postexercise. Lungs were removed 7 or 10 days later, and tumor foci were counted. Ex-F had fewer tumors than either Ex-30 or Con, whereas Ex-F-24 h also showed a strong trend toward fewer tumors. The initial localization of tumor cells in the lungs after injection was not different among groups. For the in vitro experiment, mice were killed immediately after exercise or 8 h later. Alveolar macrophages were removed and cultured in vitro with B16 melanoma cells. The growth of the tumors cultured with macrophages from Ex-F was lower than Con after exercise and, to a lesser extent, 8 h later. In Ex-30, this effect was only found immediately after exercise. The data suggest that prolonged exercise has a protective effect on lung tumor metastases and enhances alveolar macrophage antitumor cytotoxicity.

B16 melanoma; cancer; mice; immunity; running


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