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Updated: Jan 15, 2026
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Utilizing Murine Inducible Telomerase Alleles in the Studies of Tissue Degeneration/Regeneration and Cancer
Published on: April 13, 2015
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Burning the candle at both ends: ROS-mediated telomere damage drives T cell dysfunction
Alexander J Wesolowski1, Rahul Roychoudhuri1
1Department of Pathology, University of Cambridge, Cambridge, UK; CRUK Cambridge Centre, Cambridge, UK.
Immunity
|October 15, 2025
Summary
Reactive oxygen species (ROS) are vital for T cell function but can cause damage. In tumors, chronic T cell activation leads to mitochondrial ROS exposure, damaging telomeres and causing T cell dysfunction.
Area of Science:
- Immunology
- Cellular Biology
- Cancer Research
Background:
- Reactive oxygen species (ROS) play a dual role in T cell biology, supporting activation and memory while potentially driving dysfunction.
- Telomeres are critical for genomic stability and cellular lifespan.
- Tumor microenvironments often feature chronic immune cell activation.
Purpose of the Study:
- To investigate the impact of chronic T cell activation on telomeres within the tumor microenvironment.
- To elucidate the role of mitochondrial ROS in T cell dysfunction during chronic activation.
Main Methods:
- Analysis of T cells from tumor tissues.
- Assessment of telomere length and integrity.
- Measurement of mitochondrial reactive oxygen species (ROS) production.
Main Results:
- Chronic T cell activation in tumors exposes telomeres to damage.
- Mitochondrial ROS generated during chronic activation are implicated in telomere damage.
- Telomere damage correlates with T cell dysfunction in the tumor microenvironment.
Conclusions:
- Mitochondrial ROS-induced telomere damage is a mechanism contributing to T cell dysfunction in tumors.
- Targeting ROS or telomere protection may offer strategies to restore T cell function in cancer immunotherapy.
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