Cited by 175Telomeres, Telomerase, and SenescenceT-cell and B-cell ImmunologyGenetics, Aging, and Longevity in Model Organisms

Loss of CD28 expression on T lymphocytes: A marker of replicative senescence

Effros, Rita B.·1997·Developmental & Comparative Immunology

Abstract

The CD28 molecule, a disulfide-linked homodimer expressed on peripheral T cells and thymocytes, mediates an essential costimulatory signal following engagement of the T cell receptor (TCR). Increased proportions of CD28- T cells have been observed during aging and in situations of chronic immune stimulation, but the origin and functional characteristics of these cells have been unclear. T cells which reach replicative senescence in culture after multiple rounds of cell division have shortened telomeres, respond poorly to stress stimuli, and no longer express CD28, suggesting that CD28- T cells observed in vivo may be the progeny of memory cells which have been repeatedly stimulated. This review describes the features of T cell replicative senescence, presents several possible mechanisms for the generation of senescent T cells in vivo, and proposes that replicative senescence may explain immune exhaustion.

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Crossref · 10.1016/s0145-305x(97)00027-x

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32 of 32 references verified0 citation errors · 0 not checkable

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  • Oligoclonal expanded CD8+ memory T cells in humans are distinguished by loss of CD28 expression and impaired immune function.

    “These oligoclonal expanded CD8 + memory T cells are further distinguished in humans by loss of expression of the CD28 co-stimulatory molecule (47,48) and impaired immune function.”

    From Causes, consequences, and reversal of immune system aging (2013) · cites this paper as [47]

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Authors
Effros, R. B.
Affiliations
University of California, Los Angeles (US)
Corresponding author
Effros, Rita B.
Venue
Developmental & Comparative Immunology
Publisher
Elsevier BV
Published
1997-11
Volume
21
Issue
6
Pages
471-478
ISSN
0145-305X (ISSN-L)
OpenAlex
W2032253593
Cited by
175
References
33
Citations by year
2026: 5 · 2025: 3 · 2024: 5 · 2023: 6 · 2022: 2 · 2021: 5 · 2020: 7 · 2019: 7 · 2018: 8 · 2017: 2 · 2016: 4 · 2015: 10 · 2014: 3 · 2013: 9 · 2012: 5
FWCI
2.44
Type
journal article
Language
en
Open access
closed
Locations
  • Developmental & Comparative Immunology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute on Aging (AG-10415, P60AG010415)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
Keywords
CD28, immunosenescence, immune exhaustion, T cell costimulation, telomere shortening, memory T cells, chronic immune stimulation, T cell receptor signaling
MeSH terms
Cell Division, Humans, T-Lymphocytes, Biomarkers, Telomere, Cellular Senescence, CD28 Antigens

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