Abstract
Purpose
Mucosal associated invariant T (MAIT) cells have properties of the innate and acquired immune systems. While the response to vigorous exercise has been established for most leukocytes, MAIT cells have not been investigated. Therefore, the purpose was to determine if MAIT cell lymphocytosis occurs with acute maximal aerobic exercise and if this response is influenced by exercise duration, cardiovascular fitness, or body composition.
Methods
Twenty healthy young males with moderate fitness levels performed an extended graded exercise test until volitional fatigue. Peripheral blood mononuclear cells were isolated from venous blood obtained prior and immediately after exercise and were labeled to identify specific T cell populations using flow cytometry.
Results
The percentage of MAIT cells relative to total T cells significantly increased from 3.0 to 3.8% and absolute MAIT cell counts increased by 2.2-fold following maximal exercise. MAIT cell subpopulation proportions were unchanged with exercise. Within cytotoxic T lymphocytes (CTL), MAIT cells consisted of 8% of these cells and this remained constant after exercise. MAIT cell counts and changes with exercise were not affected by body composition, VO2peak, or exercise duration.
Conclusions
Maximal exercise doubled MAIT cell numbers and showed preferential mobilization within total T cells but the response was not influenced by fitness levels, exercise duration, or body composition. These results suggest that acute exercise could be used to offset MAIT cell deficiencies observed with certain pathologies. MAIT cells also make up a substantial proportion of CTLs, which may have implications for cytotoxicity assays using these cells.
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Abbreviations
- 7-AAD:
-
7-Amino-actinomycin D
- CTL:
-
Cytotoxic T lymphocyte
- GXT:
-
Graded exercise test
- HbA1C:
-
Glycated hemoglobin
- MAIT cells:
-
Mucosal associated invariant T cell
- PBMC:
-
Peripheral blood mononuclear cell
- TCR:
-
T cell receptor
- VO2peak :
-
Peak oxygen uptake
- W:
-
Watts
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Acknowledgements
The authors would like to thank the volunteers for their involvement in this study and Ms. Shadney Que and Ms. Chantelle Blythe for their assistance in the laboratory.
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This work was supported by the Collaborative Research Network from the Department of Industry, Innovation, and Science of Australia.
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Communicated by Fabio Fischetti.
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Supplemental Fig. 1 Immunofluorescence gating strategy for the identification of the proportion of (relative to the parent population) and the absolute numbers of MAIT cells with acute exercise. A) Gating of single PBMCs, B) the inclusion of CD45+ cells, C) identifying lymphocytes, and D) gating for T (CD3+) and the E) CD4+ and CD8+ T cell subpopulations. Subsequently, cells that express Vα7.2 and CD161 were determined from F) cytotoxic T lymphocytes CDLs (CD8+) and G) CD4. H) From the total T cell population (panel D), Vα7.2+CD161+ MAIT cells were identified and the G) MAIT cell subpopulations of CD4+ and CD8+ (PDF 145 kb)
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Hanson, E.D., Danson, E., Nguyen-Robertson, C.V. et al. Maximal exercise increases mucosal associated invariant T cell frequency and number in healthy young men. Eur J Appl Physiol 117, 2159–2169 (2017). https://doi.org/10.1007/s00421-017-3704-z
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DOI: https://doi.org/10.1007/s00421-017-3704-z