Abstract
Transcription factors that regulate the quiescence, proliferation and homing of lymphocytes are critical for effective immune system function. Here we demonstrate that the transcription factor ELF4 directly activated the tumor suppressor KLF4 'downstream' of T cell antigen receptor signaling to induce cell cycle arrest in naive CD8+ T cells. Elf4- and Klf4-deficient mice accumulated CD8+CD44hi T cells during steady-state conditions and generated more memory T cells after immunization. The homeostatic population expansion of CD8+CD44hi T cells in Elf4-null mice resulted in a redistribution of cells to nonlymphoid tissue because of lower expression of the transcription factor KLF2 and the surface proteins CCR7 and CD62L. Our work describes the combinatorial effect of lymphocyte-intrinsic factors on the homeostasis, activation and homing of T cells.
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Acknowledgements
We thank M. Finegold for support; T. Matano for support from the Japanese Foundation for AIDS prevention (to T.Y.); S. Nimer (Memorial Sloan-Kettering Cancer Center) for Elf4−/− and Vav-ELF4 mice; T. Tan (Baylor College of Medicine) for CD4-Cre mice. K. Kaestner (University of Pennsylvania) for mice with loxP-flanked Klf4; M. Puppi and L. Bae for assistance; M. Cubbage, C. Threeton and T. Goltsova for cell sorting; the Gulf Coast Digestive Disease Morphology Core and T.-A. Mistretta for microarray analysis; and C. Rooney for critical review of the manuscript. Supported by the National Cancer Institute of the US National Institutes of Health (KO1 CA099156-01 to H.D.L.), the Dan Duncan Cancer Center at Baylor College of Medicine (H.D.L.), the Curtis Hankamer Basic Research Fund (H.D.L.) and the US National Institute of Allergy and Infectious Diseases (1RO1AI077536-01 to H.D.L.).
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T.Y. designed and did most experiments, analyzed data and assisted in writing the manuscript; C.S.P. contributed to promoter assays, deletion of Klf4 and reviewed manuscript; M.M. contributed to promoter assays, detected CCR7 in CD4+ and CD8+ T cells by flow cytometry and reviewed manuscript; and H.D.L. conceived the research, designed experiments, directed the project as principal investigator, wrote the manuscript and funded the research.
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Yamada, T., Park, C., Mamonkin, M. et al. Transcription factor ELF4 controls the proliferation and homing of CD8+ T cells via the Krüppel-like factors KLF4 and KLF2. Nat Immunol 10, 618–626 (2009). https://doi.org/10.1038/ni.1730
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DOI: https://doi.org/10.1038/ni.1730
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