Journal
AGING CELL
Volume 15, Issue 2, Pages 291-300Publisher
WILEY
DOI: 10.1111/acel.12435
Keywords
Aging; CD8(+) T cells; T-cell exhaustion; Tim-3; PD-1
Categories
Funding
- Mid-career Researcher Program of the National Research Foundation(NRF) [2015R1A2A1A10055844]
- Ministry of Science, CT and Future Planning
- National R&D Program for Cancer Control of the Ministry of Health and Welfare [0720500]
- National Research Foundation of Korea [2015R1A2A1A10055844] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Aging is accompanied by altered T-cell responses that result in susceptibility to various diseases. Previous findings on the increased expression of inhibitory receptors, such as programmed cell death protein 1 (PD-1), in the T cells of aged mice emphasize the importance of investigations into the relationship between T-cell exhaustion and aging-associated immune dysfunction. In this study, we demonstrate that T-cell immunoglobulin mucin domain-3 (Tim-3), another exhaustion marker, is up-regulated on aged T cells, especially CD8(+) T cells. Tim-3-expressing cells also produced PD-1, but Tim-3(+)PD-1(+) CD8(+) T cells had a distinct phenotype that included the expression of CD44 and CD62L, from Tim-3(-)PD-1(+) cells. Tim-3(+)PD-1(+) CD8(+) T cells showed more evident properties associated with exhaustion than Tim-3(-)PD-1(+) CD8(+) T cells: an exhaustion-related marker expression profile, proliferative defects following homeostatic or TCR stimulation, and altered production of cytokines. Interestingly, these cells produced a high level of IL-10 and induced normal CD8(+) T cells to produce IL-10, which might contribute to immune dysregulation in aged mice. The generation of Tim-3-expressing CD8(+) T cells in aged mice seems to be mediated by encounters with antigens but not by specific infection, based on their high expression of CD49d and their unbiased TCR V usage. In conclusion, we found that a CD8(+) T-cell population with age-associated exhaustion was distinguishable by its expression of Tim-3. These results provide clues for understanding the alterations that occur in T-cell populations with age and for improving dysfunctions related to the aging of the immune system.
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