Maintaining Tolerance in CD4 T Cells
Author Information
Author(s): LARA J. AUSUBEL, ANNA CHODOS, NYREE BEKARIAN, ABUL K. ABBAS, LUCY S.K. WALKER
Primary Institution: University of California San Francisco
Hypothesis
How do self-reactive CD4 T cells interact with self-proteins in peripheral tissues without causing autoimmune disease?
Conclusion
Functional tolerance is maintained in CD4 T cells despite their encounter with self-antigen in the pancreas, unless the CTLA-4 pathway is blocked.
Supporting Evidence
- Transferred T cells proliferated specifically in the pancreatic lymph node.
- Naìˆve T cells did not induce diabetes in recipient mice unless activated in vitro.
- Blocking the CTLA-4 pathway led to rapid diabetes induction after immunization.
Takeaway
The study shows that some immune cells can recognize their own body's proteins without causing harm, but blocking a specific pathway can lead to disease.
Methodology
An adoptive transfer system was used to study HEL-specific CD4 T cells in mice expressing HEL protein in the pancreas.
Limitations
The study primarily focuses on a specific model and may not fully represent all mechanisms of T cell tolerance.
Participant Demographics
Mice aged 6 to 12 weeks were used in the study.
Digital Object Identifier (DOI)
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