High-intensity exercise elicits the mobilization of senescent T lymphocytes into the peripheral blood compartment in human subjects
Abstract
Clonal expansion of T lymphocytes in response to antigenic stimulation is a fundamental process of adaptive immunity. As a consequence of clonal expansion, some T lymphocytes acquire a senescent phenotype, fail to replicate in response to further antigenic stimulation, and express the killer cell lectin-like receptor G1 (KLRG1) and/or CD57. Physical exercise elicits a mobilization of large numbers of T lymphocytes into the bloodstream from peripheral lymphoid compartments, but the frequency of senescent cells in the mobilized population is not known. Eight male runners (age: 29 ± 9 yr; maximal O 2 uptake 62 ± 6 ml·kg −1 ·min −1 ) performed an intensive treadmill-running protocol at 80% maximal O 2 uptake to volitional exhaustion. Blood lymphocytes isolated before, immediately after, and 1 h after exercise were assessed for cell surface expression of KLRG1, CD57, CD28, CD45RA, CD45RO, CD62L, and lymphocyte subset markers (CD3, CD4, CD8, CD56) by flow cytometry. The percentage of all CD3 + T lymphocytes expressing KLRG1 and CD57 increased with exercise ( P < 0.01). The change in T-lymphocyte KLRG1 expression was attributed to both CD4 + and CD8 bright T cells, with the relative change being greater for the CD8 bright population ( P < 0.01). Mobilized T-lymphocyte populations expressing KLRG1 and CD57 appeared to extravasate the peripheral blood compartment after 1 h of recovery. In conclusion, T lymphocytes with a senescent phenotype are mobilized and subsequently removed from the bloodstream in response to acute high-intensity exercise. This suggests that T lymphocytes contained within the peripheral lymphoid compartments that are mobilized by exercise are likely to be at a more advanced stage of biological aging and have a reduced capacity for clonal expansion than blood-resident T cells.
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- Authors
- Simpson, R. J., Florida-James, G. D., Cosgrove, C., Whyte, G. P., Macrae, S., Pircher, H., & Guy, K.
- Affiliations
- Edinburgh Napier University (GB)
- Liverpool John Moores University (GB)
- University of Freiburg (DE)
- Venue
- Journal of Applied Physiology
- Publisher
- American Physiological Society
- Published
- 2007-07
- Volume
- 103
- Issue
- 1
- Pages
- 396-401
- ISSN
- 0161-7567 (ISSN-L)
- 8750-7587
- 1522-1601
- OpenAlex
- W2048687381
- Cited by
- 101
- References
- 30
- Citations by year
- 2026: 3 · 2025: 3 · 2024: 4 · 2023: 2 · 2022: 2 · 2021: 4 · 2020: 2 · 2019: 2 · 2018: 11 · 2017: 6 · 2016: 4 · 2015: 7 · 2014: 10 · 2013: 7 · 2012: 7
- FWCI
- 7.93
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Applied Physiology (publishedVersion)
- PubMed (publishedVersion)
- Edinburgh Napier Research Repository (Edinburgh Napier University) (submittedVersion)
- Topics
- Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
- Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
- Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
- Keywords
- high-intensity exercise, KLRG1, CD57, T cell mobilization, clonal expansion, CD4+ T cells, lymphocyte migration, endurance runners, treadmill running, lymphocyte subsets
- MeSH terms
- Adult, Cell Movement, Flow Cytometry, Humans, Lymphocyte Activation, Male, Oxygen Consumption, Receptors, Immunologic, Time Factors, Cohort Studies, Exercise, CD4-Positive T-Lymphocytes, Trans-Activators, Immunophenotyping, Cellular Senescence, CD3 Complex, Leukocyte Common Antigens, CD28 Antigens, CD8-Positive T-Lymphocytes, Muscle Fatigue, CD57 Antigens, L-Selectin, Lectins, C-Type
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