Abstract
Among the features that distinguish type 1 innate lymphoid cells (ILC1s) from natural killer (NK) cells is a gene signature indicative of 'imprinting' by cytokines of the TGF-β family. We studied mice in which ILC1s and NK cells lacked SMAD4, a signal transducer that facilitates the canonical signaling pathway common to all cytokines of the TGF-β family. While SMAD4 deficiency did not affect ILC1 differentiation, NK cells unexpectedly acquired an ILC1-like gene signature and were unable to control tumor metastasis or viral infection. Mechanistically, SMAD4 restrained non-canonical TGF-β signaling mediated by the cytokine receptor TGFβR1 in NK cells. NK cells from a SMAD4-deficient person affected by polyposis were also hyper-responsive to TGF-β. These results identify SMAD4 as a previously unknown regulator that restricts non-canonical TGF-β signaling in NK cells.
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Acknowledgements
We thank the Genome Technology Access Center in the Department of Genetics at Washington University School of Medicine for help with genomic analysis; H.-R. Rodewald (DKZF, Heidelberg, Germany) for Il7rCre mice; and M. Rabinovitch (Stanford University, USA) for Bmpr2f/f mice. Supported by the US National Institutes of Health (U01 AI095542, R01 DE025884 and R01 DK103039 to M. Colonna; R01 CA176695 to M. Cella; and 5T32CA009547-30 to V.S.C.), the Crohn's & Colitis Foundation of America (274415) and Cancer Research Institute (J.K.B.).
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V.S.C., T.K.U., L.C-B., J.K.B., Q.W., S.G. and M. Cella performed experiments and analyzed the data; V.S.C., M.L.R., and M. Cella performed in silico analysis; A.J.W. provided materials and clinical expertise; V.S.C., M. Cella and M. Colonna designed the experiments; and V.S.C., S.G., M. Cella and M. Colonna wrote the manuscript.
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Integrated supplementary information
Supplementary Figure 1 Marker expression by NK cells and from Smad4f/f and Smad4f/fNcr1iCre mice.
(a) Representative plots displaying pre-sort and post-sort purity of splenic NK cells from Smad4f/f and Smad4f/f x Ncr1iCre mice. (b) Quantification of surface expression of the indicated markers by splenic NK cells from Smad4f/f and Smad4f/f x Ncr1iCre mice. (c) Representative histograms showing expression of the indicated proteins by splenic NK cells from WT and SMAD4-deficient mice. (d) Representative plots and quantification of siLP ILC3 populations in WT and SMAD4-deficient mice. (e) Representative plots and quantification of intracellular IL-22 by siLP NKp46+ ILC3 after stimulation by IL-23. (f) Representative histograms of cell surface expression of CD49a in NKp46− or NKp46+ NK cells from the bone marrow of Smad4+/+ x Il7rCre and Smad4f/f x Il7rCre mice. **P<0.01, ***P < 0.001; (unpaired Student's t-test). Data are pooled from four (b) or two (d,e,f) independent experiments with 1-2 mice of each genotype for each independent experiment (error bars represent mean ± s.d. in b,d,e).
Supplementary Figure 2 Apoptosis of Smad4f/f and Smad4f/fNcr1iCre NK cells during MCMV infection or in vitro culture.
(a) Representative plots of Ly49H+ and Ly49H− splenic NK cells (gated on CD3−CD19−) from naïve Smad4f/f and Smad4f/f x Ncr1iCre mice. (b) Ly49H+ splenic NK cells from Smad4f/f and Smad4f/f x Ncr1iCre mice positive for Annexin V at days 3 and 6 of MCMV infection. (c) Splenic NK cells from Smad4f/f and Smad4f/f x Ncr1iCre mice positive for Annexin V ex vivo or after 24 and 48 h of culture with IL-2. Data are pooled (b, c) from two independent experiments with at least 1-2 mice of each genotype for each independent experiment (error bars represent mean ± s.d. in b, c).
Supplementary Figure 3 Culture of Smad4f/f and Smad4f/fNcr1iCre NK cells with cytokines of the TGF-β-family.
Representative histograms and quantification of CD49a, CD73, and TRAIL surface expression by (a) Smad4f/f and (b) Smad4f/f x Ncr1iCre NK cells after 48 h of culture with TGF-β1 + IL-2, BMP4 + IL-2, activin A + IL-2, or IL-2 alone. **P<0.01, ***P < 0.001 (unpaired Student's t-test). Data are pooled from three independent experiments with 1-2 mice of each genotype for each independent experiment (error bars represent mean ± s.d.).
Supplementary Figure 4 Effect of deficiency in SMAD4, DKO deficiency, deficiency in TGFβR2 or deficiency in BMPR2 on conventional NK cells and SG ILC1s.
(a) Representative histograms of TGFβR2 expression by splenic NK cells from Smad4f/f, Smad4f/f x Ncr1iCre, DKO, and Tgfbr2f/f x Ncr1iCre mice ex vivo. (b) Representative histograms intracellular phospho-SMAD2/3 and phospho-SMAD1/8 in splenic NK cells after 60 min of culture with TGF-β1 and IL-2. (c) Representative histograms and quantification of CD49a expression by SG ILC1 from Smad4f/f, Smad4f/f x Ncr1iCre, DKO, and Tgfbr2f/f x Ncr1iCre mice. (d) Arbitrary units of gene expression of type II receptors by splenic NK cells of wild-type mice (Immgen.org). (e) Representative histograms of cell surface expression of CD49a, CD73, and TRAIL (after 48 h of culture with IL-2) by splenic NK cells from Smad4f/f, Smad4f/f x Ncr1iCre, Tgfbr2f/f x Ncr1iCre, and Bmpr2f/f x Ncr1iCre mice. (f) Quantification of Annexin V+ NK cells from Smad4f/f, Smad4f/f x Ncr1iCre, DKO, and Tgfbr2f/f x Ncr1iCre mice after 48 h of culture with IL-2 or TGF-β1 plus IL-2 and DMSO or SB431542. ***P < 0.001 (unpaired Student's t-test). Data are pooled from at least two independent experiments with 1-2 mice of each genotype for each independent experiment (error bars represent mean ± s.d.).
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Cortez, V., Ulland, T., Cervantes-Barragan, L. et al. SMAD4 impedes the conversion of NK cells into ILC1-like cells by curtailing non-canonical TGF-β signaling. Nat Immunol 18, 995–1003 (2017). https://doi.org/10.1038/ni.3809
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DOI: https://doi.org/10.1038/ni.3809
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