Abstract
Group 2 innate lymphoid cells (ILC2s) secrete type 2 cytokines, which protect against parasites but can also contribute to a variety of inflammatory airway diseases. We report here that interleukin 1β (IL-1β) directly activated human ILC2s and that IL-12 induced the conversion of these activated ILC2s into interferon-γ (IFN-γ)-producing ILC1s, which was reversed by IL-4. The plasticity of ILCs was manifested in diseased tissues of patients with severe chronic obstructive pulmonary disease (COPD) or chronic rhinosinusitis with nasal polyps (CRSwNP), which displayed IL-12 or IL-4 signatures and the accumulation of ILC1s or ILC2s, respectively. Eosinophils were a major cellular source of IL-4, which revealed cross-talk between IL-5-producing ILC2s and IL-4-producing eosinophils. We propose that IL-12 and IL-4 govern ILC2 functional identity and that their imbalance results in the perpetuation of type 1 or type 2 inflammation.
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Acknowledgements
We thank B. Hooibrink for help with flow cytometry; staff of the Bloemenhove clinic in Heemstede, the Netherlands, for fetal tissues; K. Weijer for processing fetal material; B. Dierdorp and T. Dekker for performing the multiplex assay; E. van Rijnstra for help with the animal experiments; E. de Groot, D. van Egmond and Britt-Marie Nilsson for immunohistochemical staining; C. Loftus (Medetect AB) for computer simulations of spatial cell distributions. Y. Pineros for isolating eosinophils, and J. Fergusson for critical reading of the manuscript. Supported by the European Research Council (Advanced ERC grant 341038-AsthmaVir).
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S.M.B. and J.H.B. designed the study, did experiments, analyzed the data and wrote the manuscript; M.N., J.G. and M.M.S. did experiments and analyzed the data; K.G., M.B., J.V. and J.M.M. did experiments; C.M.v.D. and W.F. provided nasal tissue; R.L. provided BAL fluid cells and analyzed data; R.E.J. and P.H. provided lung tissue; J.S.E. performed histological assessments; H.S. designed the study, analyzed data and wrote the manuscript ; X.R.R. designed the study, did experiments, analyzed the data and wrote the manuscript; and all authors critically read the manuscript.
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Integrated supplementary information
Supplementary Figure 1 Gating strategy for the detection of ILCs in human lungs and nasal polyps, and the expression of cell-surface proteins on nasal-polyp ILCs.
(a) Flow cytometry analysis of human lung and nasal polyp tissue of CD45, Lin (CD1a, CD3, CD14, CD16, CD19, CD34, CD123, BDCA2, FcɛR1α, TCRαβ, TCRγδ), CD127, CD161, c-Kit, CRTH2, and NKp44 to detect ILC1 (CRTH2- c-Kit- NKp44-), ILC2 (CRTH2+ c-Kit+/-), and ILC3 (CRTH2- c-Kit+ NKp44+/-). (b) Flow cytometry analyzing the expression of CRTH2, IL7Rα, CD161, ST2, TSLPR, IL17RB, CD25, KLRG1, IL4R, IL9R and ICOS in ILC1 (black), ILC2 (red) and ILC3 (grey line) from nasal polyp tissue. Isotype-matched control antibody is shown as grey shaded curve. Data are representative of at least three different donors (a,b).
Supplementary Figure 2 Repopulation of Il2rg–/– NOD-SCID mice with human hematopoietic stem cells and purity of expanded ILC2 populations.
(a) Flow cytometry analysis of human and murine CD45 expression in blood, lung and spleen of Il2rg–/– NOD-SCID mice eight weeks after engraftment with human hematopoietic stem cells. (b) c-Kit and CRTH2 expression after resorting of ILC2 that were expanded for four weeks with irradiated allogeneic peripheral blood mononuclear cells, irradiated Epstein-Barr virus–transformed JY human B cells, phytohemagglutinin and IL-2. (c) CRTH2 expression after culturing CTV labeled ILC2 for 4 days with IL-2. Data are representative of six mice (a) or five different experiments (b).
Supplementary Figure 3 Reactivation of ILC2 cells with IL-33 and TSLP and transdifferentiation of lung ILC2 cells.
(a) Flow cytometry analysis of c-Kit and CRTH2 expression on blood ILC2 (left panel) and IL-5 and IL-13 production (right panel) upon stimulation for five days with IL-2, IL-2 + IL-33 + TSLP. Cells were washed and stimulated for another four days with IL-2 + IL-33 + TSLP. (b) Expression of IL12RB2 on ILC1, ILC2, ILC3 and NK cells as measured by qPCR. (c) IL-5 and IL-13 production by blood ILC2, ILC1, and ILC2 expanded with IL-2, IL-1β and IL-12 after culture for 4 days with IL-2, IL-33, and TSLP, (d) intracellular IL-5 and IFN-γ production by cells as under cafter culture for 4 days with IL-2, IL-12, and IL-18. (e) Flow cytometry analysis of c-Kit and CRTH2 expression on lung ILC2 directly after isolation and upon stimulation with IL-2, IL-33, and IL-12 for seven days and IFN-γ production of lung c-Kit- ex-ILC2 obtained upon stimulation with IL-2, IL-33, and IL-12 for seven days. (f) Isolated ILC2 from lung cultured for 6 days either with IL-2, or IL-2, IL-33, and TSLP, or with IL-2, IL-33, TSLP, and IL-12. Cells were analyzed for c-Kit and CRTH2 expression (left panels), percentage of c-Kit- ex-ILC2 generated in above mentioned activation conditions (right panel). Data are representative of three (a,c,d,e,f) or four (b) different donors.
Supplementary Figure 4 Stimulation of ILC1 and ILC3 cells with IL-4, and gating strategy for BAL-fluid ILCs.
(a) Flow cytometry analysis of c-Kit and CRTH2 expression on blood ILC1 and ILC3 upon stimulation for five days with IL-2 or IL-2 and IL-4. (b) Gating strategy for ILC detection and ILC distribution in bronchoalveolar lavage (BAL) fluid. Data are representative of three individual experiments (a) or five different samples (b).
Supplementary Figure 5 Gating strategy for basophils, mast cells and eosinophils in nasal-polyp and turbinate tissue.
Polyp and turbinate tissue was analyzed by flow cytometry for CD45, CD3, CD123, FcɛRI, c-Kit, CD203c and Siglec8. Basophils were gated as CD3- CD123+ FcɛRI+ CD203c+, mast cells as c-Kit+ FcɛRI+ CD203c+, and eosinophils as SSChigh Siglec8+. Data are representative of five polyp and two turbinate samples.
Supplementary Figure 6 ILC2 spatial distribution.
Using the known x,y coordinates for each eosinophil, the true observed accumulated eosinophil counts within a fixed close space surrounding each ILC2 cell were calculated and compared to computer simulations of random ILC distributions. The true accumulated eosinophils count within a 300 µm radius around each of the 20 ILC in Figure 8b (n=668 ILC-associated eosinophils) was compared to the combined eosinophil counts calculated for simulated 250 000 cases of computer-generated random distributions of the same number of fictive ILCs (mean combined eosinophil count = 139, range 35-452).
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Bal, S., Bernink, J., Nagasawa, M. et al. IL-1β, IL-4 and IL-12 control the fate of group 2 innate lymphoid cells in human airway inflammation in the lungs. Nat Immunol 17, 636–645 (2016). https://doi.org/10.1038/ni.3444
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DOI: https://doi.org/10.1038/ni.3444
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