Cited by 92T-cell and B-cell ImmunologyTelomeres, Telomerase, and SenescenceGenetics, Aging, and Longevity in Model Organisms

Loss of T cell receptor-induced Bmi-1 in the KLRG1 + senescent CD8 + T lymphocyte

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Heffner, Maike, Fearon, Douglas T.·2007·Proceedings of the National Academy of Sciences

Abstract

Clones of CD8 + T cells specific for viral antigens must avoid replicative senescence to maintain continuous production of new effector cells during chronic viral infections. In the present study, we have determined whether this capability may be related to Bmi-1, a transcriptional repressor that is required for the maintenance of hematopoietic stem cells and certain neural stem cells and that mediates its antisenescence function by inhibiting transcription of the Ink4a / Arf tumor suppressor locus. Ligation of the T cell receptor increased the levels of Bmi-1 mRNA and protein in primary CD8 + T cells. The increased expression was reversible upon removal of antigen but could be maintained by using stimulation with the IL-2 receptor. Specific suppression of Bmi-1 by using a lentivirally encoded short hairpin RNA inhibited the proliferation of IL-2-stimulated CTLL-2 cytotoxic T cells and primary CD8 + T cells. Ectopically expressed Bmi-1 enhanced the expansion of primary CD8 + T cells stimulated by IL-2 and IL-7 in vitro and by homeostatic signals in vivo . Taken together, these findings indicate that Bmi-1 is required for CD8 + T cell clonal expansion and is positively regulated by receptors that mediate this response. Therefore, the observation that the ability of the T cell receptor to induce Bmi-1 is maintained in the subset of replication-competent, antigen-experienced CD8 + T cells that do not express the killer cell lectin-like receptor G1 (KLRG1) but is developmentally switched off in the senescent, KLRG1 + subset suggests that Bmi-1 is a molecular determinant of the capacity of a CD8 + T cell clone to persist during chronic viral infections.

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Crossref · 10.1073/pnas.0706040104

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  • High expression of Tim-3, CD57, and KLRG-1, in addition to low CD28, is thought to be associated with T cell senescence.

    “In addition to low expression of CD28, high expression of Tim-3, CD57, killer cell lectin-like receptor subfamily G, member 1 (KLRG-1) are thought to be associated with T cell senescence [40,60–64](Fig. 2).”

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Authors
Heffner, M., & Fearon, D. T.
Affiliations
University of Cambridge (GB)
Venue
Proceedings of the National Academy of Sciences
Published
2007-08-14
Volume
104
Issue
33
Pages
13414-13419
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2050319872
Cited by
92
References
41
Citations by year
2026: 2 · 2025: 4 · 2024: 3 · 2023: 9 · 2022: 6 · 2021: 5 · 2020: 3 · 2019: 3 · 2018: 3 · 2017: 4 · 2016: 2 · 2015: 5 · 2014: 3 · 2013: 8 · 2012: 7
FWCI
2.73
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Wellcome Trust
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
Keywords
BMI1, CD8+ T cells, T cell receptor signaling, KLRG1, replicative senescence, chronic viral infection, clonal expansion, interleukin-2, IL-7, Ink4a/Arf, transcriptional repressor, cytotoxic T lymphocytes, T cell homeostasis
MeSH terms
Animals, Immunologic Memory, Mice, Inbred C57BL, Nuclear Proteins, Proto-Oncogene Proteins, Receptors, Antigen, T-Cell, Receptors, Immunologic, Repressor Proteins, Cellular Senescence, CD8-Positive T-Lymphocytes, Lectins, C-Type, Cell Proliferation, Mice, Polycomb Repressive Complex 1

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