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Dynamic expression of transcription factors T-bet and GATA-3 by regulatory T cells maintains immunotolerance

Abstract

Regulatory T cells (Treg cells) can express the transcription factors T-bet and GATA-3, but the function of this expression and whether such cells represent stable subsets is still unknown. By using various reporter tools, we found that the expression of T-bet and GATA-3 in Treg cells was dynamically influenced by the cytokine environment. Treg cell–specific deletion of the gene encoding either T-bet (Tbx21) or GATA-3 (Gata3) alone did not result in loss of Treg cell function; however, mice with combined deficiency in both genes in Treg cells developed severe autoimmune-like diseases. Loss of Treg cell function correlated with upregulation of expression of the transcription factor RORγt and reduced expression of the transcription factor Foxp3. Thus, in the steady state, activated Treg cells transiently upregulated either T-bet or GATA-3 to maintain T cell homeostasis.

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Figure 1: The expression of T-bet and GATA-3 in Treg cells can be induced by cytokines.
Figure 2: Dynamic expression of T-bet or GATA-3 in Treg cells in vitro and in vivo.
Figure 3: Confirmation of dynamic expression of T-bet in Treg cells by the T-bet fate-mapping tool.
Figure 4: Treg cells singly devoid of either T-bet or GATA-3 are functional in protecting against T cell–mediated colitis.
Figure 5: Ablation of both T-bet and GATA-3 in Treg cells results in autoimmune lymphoproliferative disease.
Figure 6: Treg cells doubly deficient in both T-bet and GATA-3 do not suppress colitis.
Figure 7: The dysfunction of Tbx21fl/flGata3fl/flFoxp3-Cre Treg cells is cell intrinsic.

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Acknowledgements

We thank J.D. Engel (University of Michigan) for GATA-3–GFP reporter mice on the C57BL/6 background; S. Reiner (University of Columbia) for Tbx21fl/fl mice; A. Rudensky (Memorial Sloan Kettering Cancer Center) for Foxp3-IRES-YFP-Cre mice; D. Jankovic (National Institute of Allergy and Infectious Diseases (NIAID)) for Stat1−/− mice; E. Shevach, Y. Belkaid and W. Paul for critical reading of the manuscript and discussions; A. Thornton for discussions; L. Guo for the help with enzyme-linked immunosorbent assay experiments; N. Cereb and S.Y. Yang (Histogenetics) and S. Reiner (Columbia University) for constructing and providing Tbx21fl/fl mice; and the flow cytometry core facility of the NIAID for cell sorting. Supported by the Division of Intramural Research of the NIAID (US National Institutes of Health).

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Authors and Affiliations

Authors

Contributions

F.Y. performed all experiments; S.S. and J.E. helped in some experiments and made suggestions on the manuscript; L.F. helped make the transgenic mouse strains; and F.Y. and J.Z. designed the experiments, analyzed the data and wrote the paper.

Corresponding author

Correspondence to Jinfang Zhu.

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The authors declare no competing financial interests.

Integrated supplementary information

Supplementary Figure 1 AmCyan is a faithful reporter for T-bet expression.

(a) Splenocytes from the T-bet-AmCyan BAC transgenic mice were sorted for AmCyan+ and AmCyan- populations and then intracellular staining for T-bet expression in these two populations was carried out. (b) Naïve CD4+ (CD4+CD25-CD45RBhiAmCyan-) T cells were isolated by cell sorting from the T-bet-AmCyan BAC transgenic mice and then cultured under TH1 or TH2 polarizing conditions for 4 days. AmCyan was then assessed by flow cytometry. Each number above the gate indicates the percentage of AmCyan positive cells. Data are representative of two independent experiments.

Supplementary Figure 2 Analysis of Treg cell subsets before and after cell sorting.

(a) Splenocytes from the T-bet-AmCyan:GATA3-GFP:Foxp3-mRFP tri-color reporter mice were stained with anti-CD4 and anti-CXCR3. Plot on the left was gated on CD4+Foxp3-RFP+ population; histograms on the right show CXCR3 expression on each Treg subset. (b, c) Treg subsets were separated from the T-bet-AmCyan:GATA3-GFP:Foxp3-RFP tri-color reporter mice by cell sorting. The purity of each sorted population was shown (b). Plots were gated on CD4+Foxp3-RFP+ population. Some sorted cells were first stained with anti-CXCR3 and then fixed. They were then permeabilized and stained intracellularly with anti-T-bet overnight (c). Plots show T-bet and CXCR3 expression by each Treg subset. Data are representative of three (a), more than five (b) and two (c) independent experiments.

Supplementary Figure 3 T-bet expression in Treg cells depends on STAT1-activating cytokines.

Cells from the spleens and lymph nodes of wild type, Stat1-/-, Stat4-/- and IFN-gr1-/- T-bet-ZsGreen mice were fixed and stained for CD4, CD25 and Foxp3 and then analyzed by flow cytometry. Dot plots were gated on CD4+CD25+Foxp3+ population. Data are representative of two independent experiments.

Supplementary Figure 4 Combined deficiency of T-bet and GATA-3 in Treg cells does not affect the development of Treg cells.

(a) Flow cytometric analysis of percentage of CD4+ and CD8+ T cells in the thymi of 8-week old Foxp3-Cre and Tbx21fl/flGata3fl/fl-Foxp3-Cre (DKO) mice. (b) Graphical presentation of percentage of Foxp3+ Treg cells among CD4 single positive thymocytes of 8-week old Foxp3-Cre and DKO mice. Each dot represents an individual mouse. (c) Graphical presentation of percentage of Foxp3+ Treg cells among CD4+ T cells in the spleen and lymph nodes of 8-week old Foxp3-Cre and DKO mice. Data are representative of two independent experiments. Error bars represent standard deviation of the mean (n=6). Statistical significance was determined by an ordinary one-way ANOVA (b and c). ns, not significant, *p<0.05, ****p<0.0001.

Supplementary Figure 5 Combined deficiency in T-bet and GATA-3 in Treg cells does not affect the proliferation or survival of Treg cells.

The splenocytes from 8-week old Foxp3-Cre and Tbx21fl/flGata3fl/fl-Foxp3-Cre (DKO) mice were stained with anti-CD4, anti-Foxp3, anti-CD25 and Ki-67 (a) or Bcl-2 (b). Dot plots were gated on CD4+Foxp3+ live cells. Numbers indicate the percentages in each quadrant. Data are representative of two independent experiments, each experiment with 2-3 mice in each group.

Supplementary Figure 6 Tbx21fl/flGata3fl/flFoxp3-Cre (DKO) Treg cells have normal expression of CD25 and CTLA-4 but lower expression of GITR, CD103 and Nrp-1.

The splenocytes from 8-week old Foxp3-Cre and DKO mice were stained with anti-CD4, anti-Foxp3 and antibodies against various “Treg-specific” cell surface markers. All the stainings were performed without cell permeablization except for CTLA-4 staining. Histograms were gated on CD4+Foxp3+ live cells. Data are representative of two independent experiments, each experiment with 2-3 mice in each group.

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Yu, F., Sharma, S., Edwards, J. et al. Dynamic expression of transcription factors T-bet and GATA-3 by regulatory T cells maintains immunotolerance. Nat Immunol 16, 197–206 (2015). https://doi.org/10.1038/ni.3053

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