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Published on: April 21, 2015
Interferon-Gamma-Producing CD8+ Tissue Resident Memory T Cells Are a Targetable Hallmark of Immune Checkpoint
Sarah C Sasson1, Stephanie M Slevin1, Vincent T F Cheung1
1Translational Gastroenterology Unit, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom; National Institute for Health Research Oxford Biomedical Research Centre, Oxford University Hospitals National Health Service Foundation Trust, John Radcliffe Hospital, Oxford, United Kingdom.
Immune checkpoint inhibitor (ICI)-colitis is driven by CD8+ tissue-resident memory T cells. These cells, producing interferon-gamma, are a key target for treating ICI-colitis.
Area of Science:
- Immunology
- Gastroenterology
- Oncology
Background:
- Immune checkpoint inhibitor (ICI)-colitis pathogenesis is not fully understood.
- Identifying cellular drivers and therapeutic targets for ICI-colitis is crucial.
Purpose of the Study:
- To identify key cellular drivers of ICI-colitis.
- To compare ICI-colitis with idiopathic ulcerative colitis.
- To find novel therapeutic targets for ICI-colitis.
Main Methods:
- Cross-sectional and longitudinal study designs.
- Multiparameter and spectral flow cytometry, spectral immunofluorescence microscopy.
- Targeted gene panels, bulk and single-cell RNA sequencing.
Main Results:
- CD8+ tissue-resident memory T (T_RM) cells are the dominant activated T cell subset in ICI-colitis.
- ICI-colitis immunopathology differs from ulcerative colitis at immune and epithelial levels.
- Activated CD8+ T_RM cells express checkpoint inhibitors and interferon-gamma, correlating with disease severity.
Conclusions:
- Interferon gamma-producing CD8+ T_RM cells are a pathological hallmark of ICI-colitis.
- These CD8+ T_RM cells represent a novel therapeutic target for ICI-colitis.
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