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Updated: Sep 14, 2025
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Tailoring In Vivo Cytotoxicity Assays to Study Immunodominance in Tumor-specific CD8+ T Cell Responses
Published on: May 6, 2019
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Tissue origin and virus specificity shape human CD8+ T cell cytotoxicity
Julia Niessl1, Thomas R Müller1, Christian Constantz1
1Center for Infectious Medicine, Department of Medicine Huddinge, Karolinska Institutet, Stockholm, Sweden.
Science Immunology
|July 18, 2025
Summary
Cytotoxic CD8+ T cell molecule expression varies by location and memory status. Tissue residency reduces conventional cytotoxic molecules but environmental cues can modulate killing activity.
Area of Science:
- Immunology
- Cellular Biology
Background:
- CD8+ T cells are known for cytotoxic activity.
- The compartmentalization of cytotoxic programs across tissues and memory subsets remains unclear.
Purpose of the Study:
- To investigate the regulation of cytotoxic molecule expression in human CD8+ T cells.
- To understand how tissue residency and environmental factors influence T cell cytotoxicity.
Main Methods:
- Analysis of a human organ donor cohort.
- In vitro studies using a tonsil system with transforming growth factor-β and interleukin-15.
Main Results:
- Conventional cytotoxic molecules (granulysin, perforin, granzyme B) were highest in circulating memory CD8+ T cells and decreased with tissue residency.
- Expression of other granzymes varied across tissues, with coordinated expression in virus-specific T cells.
- Transforming growth factor-β and interleukin-15 modulated cytotoxic molecule expression, proliferation, and redirected killing activity.
Conclusions:
- Human memory CD8+ T cell cytotoxicity is compartmentalized and influenced by tissue location.
- Environmental cues, including cytokines, play a critical role in regulating T cell effector functions.
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