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Exercise training and mouse mammary tumour metastasis
L Hoffman-Goetz1, K M May, Y Arumugam
1Department of Health Studies and Gerontology, Faculty of Applied Health Sciences, University of Waterloo, Ontario, Canada.
Anticancer Research
|November 1, 1994
Summary
Exercise impacts immune cell activity but not overall tumor burden in mice. While continuous exercise showed a trend towards higher tumor multiplicity, stopping exercise increased specific immune responses.
Area of Science:
- Immunology
- Exercise Physiology
- Cancer Metastasis
Background:
- Exercise is known to modulate immune function.
- The effect of exercise timing on experimental metastasis and immune cell activity requires further investigation.
Purpose of the Study:
- To investigate how exercise influences experimental metastasis of mouse mammary tumors.
- To determine the impact of exercise onset timing on Natural Killer (NK) and Lymphokine-Activated Killer (LAK) cell activity.
Main Methods:
- Mice underwent 8 weeks of treadmill or wheel running exercise, or remained sedentary.
- Tumor cells were injected intravenously, followed by different exercise/sedentary conditions for 3 weeks.
- NK and LAK cell activity, and lung tumor multiplicity were assessed.
Main Results:
- No significant difference in average lung tumor number across activity conditions.
- Continuous treadmill exercise showed a trend towards higher tumor multiplicity.
- Spleen LAK activity was significantly elevated in mice that stopped exercising post-tumor injection.
- NK activity decreased in mice that ceased exercise after tumor cell injection.
Conclusions:
- Exercise influences in vitro immune cytotoxic mechanisms, but this may not lead to significant changes in tumor burden.
- The dissociation between immune response and tumor outcome might be due to tumor cell resistance to NK cell lysis.
- Further research is needed to explore IL-2 infusion effects in exercise-trained animals.