Abstract
Regulatory T cells (Treg cells) express members of the tumor-necrosis factor (TNF) receptor superfamily (TNFRSF), but the role of those receptors in the thymic development of Treg cells is undefined. We found here that Treg cell progenitors had high expression of the TNFRSF members GITR, OX40 and TNFR2. Expression of those receptors correlated directly with the signal strength of the T cell antigen receptor (TCR) and required the coreceptor CD28 and the kinase TAK1. The neutralization of ligands that are members of the TNF superfamily (TNFSF) diminished the development of Treg cells. Conversely, TNFRSF agonists enhanced the differentiation of Treg cell progenitors by augmenting responsiveness of the interleukin 2 receptor (IL-2R) and transcription factor STAT5. Costimulation with the ligand of GITR elicited dose-dependent enrichment for cells of lower TCR affinity in the Treg cell repertoire. In vivo, combined inhibition of GITR, OX40 and TNFR2 abrogated the development of Treg cells. Thus, expression of members of the TNFRSF on Treg cell progenitors translated strong TCR signals into molecular parameters that specifically promoted the development of Treg cells and shaped the Treg cell repertoire.
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Acknowledgements
We thank C. Riccardi (Universita Di Perugia) and E. Shevach (US National Institutes of Health) for Gitr−/− mice; R. Schreiber (Washington University) for neutralizing antibody to TNFR2; G. Hubbard, A. Kne and C. Reis for assistance with animal husbandry; T. Martin, J. Motl and P. Champoux for cell sorting and maintenance of the Flow Cytometry Core Facility at the University of Minnesota (5P01AI035296); and C. Katerndahl, A. Moran, A. Pagán, G. Stritesky, K. Pauken, L. Heltemes-Harris and K. Berquam-Vrieze for comments and for reviewing the manuscript. Supported by the Immunology Training Program of the University of Minnesota (2T32AI007313 to S.A.M. and J.M.S.), the University of Minnesota Medical Scientist Training Program (5T32GM008244 to S.A.M. and J.M.S.), the US National Institutes of Health (F30DK096844 and F30DK100159 to S.A.M. and J.M.S.; HL062683 to J.S.B. and J.M.G.; AI101407 and NS64599 to H.C. and Y.W.; AI088209 to K.A.H. and Y.X.; and CA154998, CA151845 and AI061165 to M.A.F.), the US National Cancer Institute (1F31CA183226 to L.S.M.), the University of Minnesota Undergraduate Research Opportunities Program (H.M.S.) and the Leukemia and Lymphoma Society (M.A.F.).
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S.A.M. designed and did experiments and wrote the manuscript; L.S.M., H.M.S., Y.X., Y.W., D.L.O., J.M.S. and J.S.B. did some experiments and contributed intellectually to the work; J.M.G., H.Y., H.C. and K.A.H. provided reagents and/or animals and intellectual contributions; M.A.F. designed experiments, supervised research and assisted in the preparation of the manuscript; and all authors read the manuscript and helped with final revisions.
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Supplementary Figure 1 TNFRSF expression during thymocyte development.
Thymocytes from Foxp3-GFP reporter mice were harvested and evaluated by flow cytometry for expression of GITR, OX40, TNFR2, and CD27. Gates used to identify the indicated populations were as follows; DN thymocytes: CD4−CD8− (grad shaded histograms), DP thymocytes: CD4+CD8+ (black lines), conventional CD4SP: CD4+CD8−CD25−Foxp3− (red lines), Treg cell progenitors were CD25+Foxp3− (green lines), and mature Treg cells were CD25+Foxp3+ (blue lines).
Supplementary Figure 2 GITR and OX40 are diminished on Treg cell progenitors from Cd28-/- mice on the C57BL/6 background.
Histograms plotted in the top panels showing GITR and OX40 expression are derived by gating on Treg cell progenitors from Cd28-/- mice (red histograms) and their wild type littermates (B6 background; blue histograms). In the lower panels, cumulative data are shown for the expression of GITR and OX40 on Treg cell progenitors from CD28-deficient mice in comparison to wild type littermates (mean ± SEM, n=3, p-values generated by student's T-test).
Supplementary Figure 3 Frequency of CD25+Foxp3− Treg cell progenitors in dominant-negative mixed−bone marrow chimeras.
Cells in gates drawn in Fig. 6b were evaluated for CD25 and Foxp3 expression to determine the frequencies of CD25+Foxp3− Treg cell progenitors. The percentage of Treg cell progenitors within CD4SP in each group is plotted as a scatter plot (mean ± SEM, n ≥ 3).
Supplementary Figure 4 CD25−FOXP3lo Treg cell progenitors express TNFRSF in proportion to TCR signal strength and are responsive to TNFRSF costimulation
(a,b) CD25+Foxp3− Treg cell progenitors, and the alternately described population of Treg cell progenitors which are CD25−Foxp3lo are gated in red and blue, respectively, and are compared to conventional CD4SP (CD25−Foxp3−; gray shaded histogram) for expression of GITR and OX40. Raw values for GITR and Nur77-GFP from (c) CD25+Foxp3− and (d) CD25−Foxp3lo Treg cell progenitors were plotted and used to calculate Pearson correlation coefficients. P-values assess whether the degree of correlation was statistically significant. (e) CD25−Foxp3lo Treg cell progenitors were sorted from Foxp3-RFP x Nur77-GFP reporter mice and incubated with 1 U/mL IL-2 and increasing concentrations of GITRL-Fc. The percentage of cells which upregulated CD25 and converted into mature CD25+Foxp3+ Treg cells after 72h are shown in the scatter plot with a regression line applied. (f) The MFI of Nur77-GFP in newly formed CD25+Foxp3+ Treg cells is shown after sorting CD25−Foxp3lo Treg cell progenitors from Foxp3-RFP x Nur77-GFP reporter mice and stimulating for 72h with 1 U/mL IL-2 and increasing concentrations of GITRL-Fc.
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Mahmud, S., Manlove, L., Schmitz, H. et al. Costimulation via the tumor-necrosis factor receptor superfamily couples TCR signal strength to the thymic differentiation of regulatory T cells. Nat Immunol 15, 473–481 (2014). https://doi.org/10.1038/ni.2849
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DOI: https://doi.org/10.1038/ni.2849
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