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 IIârestricted 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 IIârestricted CD4+ cytotoxic T lymphocytes.
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Acknowledgements
We thank A. Larange and I. Vicente-Suarez for discussions and critical reading of the manuscript; M. Cheroutre for contributions in conceiving of the project; Y. Wang-Zhu for preparing tetramers of the thymic leukemia antigen and breeding Rag1â/â mice; C. Kim and K. Van Gunst for cell sorting; D. Littman (New York University) for E8I-deficient mice; and D. Kappes (Fox Chase Cancer Center) for Thpok vectors. Supported by the US National Institutes of Health (R01 AI050265 and DP1 OD006433 to H.C.; F32 DK082249 to J.-W.S.; and P01 DK46763 to M.K. and H.C.), the Research Center for Allergy and Immunology (H.C. and I.T.), the Japan Society for the Promotion of Science (I.T.), Ter Meulen fund (F.v.W.) and the Crohn's & Colitis Foundation of America (D.M.). This is manuscript 1263 from the La Jolla Institute for Allergy and Immunology.
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H.C., I.T., M.K., D.M. and M.M.H. conceived of the project; M.M.H., D.M. and F.v.W. generated the phenotypic and functional data; I.T., S.M., Y.N. and C.M. generated the data on fate mapping and deletion of the Thpok silencer and did the ChIP assays; R.S. transfected cells; Y.H. provided the data on IL-7R-deficient mice; B.S.R., M.D. and A.A. generated the gene arrays; G.K., F.L. and C.J.L. transferred cells and analyzed mice; J.-W.S. and D.M. infected mice with citrobacter; K.A. and K.H. reconstituted germ-free mice; S.S. generated the data on the role of MAZR; Y.P. analyzed Myd88â/â mice; P.W., D.M., F.v.W., B.S.R. and H.C. analyzed the gene-array data; T.N. and W.E. provided expertise; M.K. provided conceptual advice and helped with data analysis and writing of the manuscript; I.T. and H.C. generated concepts, designed experiments, analyzed data and wrote the manuscript; and all authors contributed to the writing of the manuscript and provided advice.
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Mucida, D., Husain, M., Muroi, S. et al. Transcriptional reprogramming of mature CD4+ helper T cells generates distinct MHC class IIârestricted cytotoxic T lymphocytes. Nat Immunol 14, 281â289 (2013). https://doi.org/10.1038/ni.2523
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DOI: https://doi.org/10.1038/ni.2523
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