Cited by 202T-cell and B-cell ImmunologyImmunotherapy and Immune ResponsesHIV Research and Treatment

Differentiation of human CD8 T cells: implications for in vivo persistence of CD8+ CD28− cytotoxic effector clones

Posnett, David N., Edinger, James W., Manavalan, J. Sanil, Irwin, Craig, Marodon, Gilles·1999·International Immunology

Abstract

CD8 T cells contain a distinct subset of CD8+ CD28- cells. These cells are not present at birth and their frequency increases with age. They frequently contain expanded clones using various TCRalphabeta receptors and these clones can represent >50% of all CD8 cells, specially in old subjects or patients with chronic viral infections such as HIV-1. Herein, it is shown that a large fraction of CD8+ CD28- cells expresses intracellular perforin by three-color flow cytometry, in particular when this subset is expanded. Together with their known ability to exert potent re-directed cytotoxicity, this indicates that CD8+ CD28- T cells comprise cytotoxic effector cells. With BrdU labeling, we show that CD8+ CD28- cells derive from CD8+ CD28+ precursors in vitro. In addition, sorted CD8+ CD28+ cells gave rise to a population of CD8+ CD28- cells after allo-stimulation. Moreover, ex vivo CD8+ CD28+ cells contain the majority of CD8 blasts, supporting the notion that they contain the proliferative precursors of CD8+ CD28- cells. CD95 (Fas) expression was lower in CD8+ CD28- cells, and this subset was less prone to spontaneous apoptosis in ex vivo samples and more resistant to activation-induced cell death induced by a superantigen in vitro. Thus, the persistence of expanded clones in vivo in the CD8+ CD28- subset may be explained by antigen-driven differentiation from CD8+ CD28+ memory precursors, with relative resistance to apoptosis as the clones become perforin(+) effector cells.

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Crossref · 10.1093/intimm/11.2.229

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Authors
Posnett, D. N., Edinger, J. W., Manavalan, J. S., Irwin, C., & Marodon, G.
Affiliations
Cornell University (US)
Corresponding author
Posnett, David N.
Venue
International Immunology
Published
1999-02
Volume
11
Issue
2
Pages
229-241
ISSN
  • 0953-8178 (ISSN-L)
  • 1460-2377
OpenAlex
W2117623957
Cited by
202
References
58
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2022: 4 · 2021: 4 · 2020: 2 · 2019: 8 · 2018: 3 · 2017: 6 · 2016: 3 · 2015: 2 · 2014: 5 · 2012: 5
FWCI
6.06
Type
journal article
Language
en
Open access
closed
Locations
  • International Immunology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Drug Abuse
  • National Institute of Allergy and Infectious Diseases (AI-22333)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
  • Life Sciences › Immunology and Microbiology › Virology › HIV Research and Treatment
Keywords
CD8+CD28- T cells, T cell differentiation, cytotoxic effector cells, perforin, apoptosis resistance, Fas/CD95, T cell clonal expansion, HIV-1, chronic viral infection, T cell persistence
MeSH terms
Adult, Aged, Aging, Cell Differentiation, Clone Cells, Humans, Membrane Glycoproteins, Middle Aged, T-Lymphocytes, Cytotoxic, T-Lymphocyte Subsets, Receptors, Antigen, T-Cell, alpha-beta, Apoptosis, Superantigens, CD28 Antigens, CD8-Positive T-Lymphocytes, Pore Forming Cytotoxic Proteins, Perforin

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