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Published on: June 12, 2021
T Cell Exhaustion as a Regulated Differentiation Programme
Marc Veldhoen1,2, Cristina Ferreira1
1Gulbenkian Institute for Molecular Medicine, Lisbon, Portugal.
European Journal of Immunology
|June 17, 2026
Summary
T cell exhaustion is a structured differentiation process, not fatigue. Immune checkpoint blockade expands progenitor exhausted cells (TPEX), aiding therapeutic strategies for chronic infections and tumors.
Area of Science:
- Immunology
- Cellular Biology
- Cancer Research
Background:
- T cell exhaustion is traditionally viewed as cellular fatigue.
- Recent evidence suggests it's an antigen-driven differentiation program.
- Understanding this process is crucial for treating chronic infections and cancer.
Purpose of the Study:
- To reframe T cell exhaustion as a differentiation process.
- To elucidate the hierarchical states of T cell differentiation.
- To clarify the mechanism of action for immune checkpoint blockade.
Main Methods:
- Analysis of T cell differentiation states.
- Investigation of epigenetic architecture.
- Integration of data from chronic infection, tumor immunology, and tissue adaptation models.
Main Results:
- CD8+ T cells differentiate into progenitor exhausted (TPEX), intermediate (TEXint), and terminally exhausted (TEX term) states.
- TPEX cells retain self-renewal and responsiveness to immune checkpoint blockade.
- Exhaustion shares mechanisms with tissue-resident memory (TRM) cells but are distinct entities.
Conclusions:
- T cell exhaustion is a hierarchical differentiation program crucial for immune surveillance and limiting tissue damage.
- Immune checkpoint blockade primarily expands TPEX cells.
- This framework reframes therapeutic strategies for antigen-driven diseases.
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