Abstract
TCRαβ thymocytes differentiate into either CD8αβ(+) cytotoxic T lymphocytes or CD4(+) helper T cells. This functional dichotomy is controlled by key transcription factors, including the helper T cell master regulator ThPOK, which suppresses the cytolytic program in major histocompatibility complex (MHC) class II-restricted CD4(+) thymocytes. ThPOK continues to repress genes of the CD8 lineage in mature CD4(+) T cells, even as they differentiate into effector helper T cell subsets. Here we found that the helper T cell fate was not fixed and that mature, antigen-stimulated CD4(+) T cells terminated expression of the gene encoding ThPOK and reactivated genes of the CD8 lineage. This unexpected plasticity resulted in the post-thymic termination of the helper T cell program and the functional differentiation of distinct MHC class II-restricted CD4(+) cytotoxic T lymphocytes.
Original language | English |
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Pages (from-to) | 281-9 |
Number of pages | 9 |
Journal | Nature immunology |
Volume | 14 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2013 |
Keywords
- Animals
- Cell Differentiation
- Cell Lineage
- Citrobacter rodentium
- Histocompatibility Antigens Class II
- Homeodomain Proteins
- Interleukin-7
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- T-Lymphocytes, Cytotoxic
- T-Lymphocytes, Helper-Inducer
- Thymocytes
- Transcription Factors