Abstract
Innate lymphoid cells (ILCs) are an emerging family of innate immune cells and have been found to have an important role in infection, inflammation and tissue repair. In particular, recent work has identified significant alterations of ILC responses in tumor patients, suggesting potential roles of ILCs in tumor development. In this paper, we have focused on the basic features of ILCs and their interaction with other immune cells. Importantly, as the role of cytotoxic natural killer cells, assigned to ILC1 family, in cancer has been well established, we have summarized the new findings that showcase the potential role and mechanism of helper ILCs in different tumors. Helper ILCs might promote or inhibit tumor growth and metastasis, which depends on tumor type and ILC subset.
Papers of special note have been highlighted as: • of interest; •• of considerable interest
Reference
- 1. Innate lymphoid cells – a proposal for uniform nomenclature. Nat. Rev. Immunol. 13(2), 145–149 (2013).Crossref, Medline, CAS, Google Scholar
- 2. Human intrahepatic ILC2 are IL-13positive amphiregulinpositive and their frequency correlates with model of end stage liver disease score. PLoS ONE 12(12), e0188649 (2017).Crossref, Medline, Google Scholar
- 3. Innate lymphoid cells at the human maternal-fetal interface in spontaneous preterm labor. Am. J. Reprod. Immunol. 79(6), e12820 (2018).Crossref, Medline, Google Scholar
- 4. . Innate lymphoid cells at the interface between obesity and asthma. Immunology 153(1), 21–30 (2018).Crossref, Medline, CAS, Google Scholar
- 5. Respiratory syncytial virus prevents the subsequent development of ovalbumin-induced allergic responses by inhibiting ILC2 via the IL-33/ST2 pathway. Immunotherapy 10(12), 1065–1076 (2018).Link, CAS, Google Scholar
- 6. . NK cell development, homeostasis and function: parallels with CD8(+) T cells. Nat. Rev. Immunol. 11(10), 645–657 (2011).Crossref, Medline, CAS, Google Scholar
- 7. Transcriptional and epigenetic networks of helper T and innate lymphoid cells. Immunol. Rev. 261(1), 23–49 (2014).Crossref, Medline, CAS, Google Scholar
- 8. Intraepithelial type 1 innate lymphoid cells are a unique subset of IL-12- and IL-15-responsive IFN-gamma-producing cells. Immunity 38(4), 769–781 (2013).Crossref, Medline, CAS, Google Scholar
- 9. . Innate lymphoid cells in the initiation, regulation and resolution of inflammation. Nat. Med. 21(7), 698–708 (2015).Crossref, Medline, CAS, Google Scholar
- 10. . Development, differentiation, and diversity of innate lymphoid cells. Immunity 41(3), 354–365 (2014).Crossref, Medline, CAS, Google Scholar
- 11. The transcription factor GATA-3 controls cell fate and maintenance of type 2 innate lymphoid cells. Immunity 37(4), 634–648 (2012).Crossref, Medline, CAS, Google Scholar
- 12. The transcription factor GATA3 is essential for the function of human type 2 innate lymphoid cells. Immunity 37(4), 649–659 (2012).Crossref, Medline, Google Scholar
- 13. Environmental allergens induce allergic inflammation through proteolytic maturation of IL-33. Nat. Immunol. 19(4), 375–385 (2018).Crossref, Medline, CAS, Google Scholar
- 14. IL-25 axis is involved in the pathogenesis of human primary and experimental Sjogren's syndrome. Arthritis Rheumatol.
doi:10.1002/art.40500 (2018) (Epub ahead of print).Crossref, Google Scholar - 15. . Innate immune cell populations function as initiators and effectors in Th2 cytokine responses. Trends Immunol. 31(11), 407–413 (2010).Crossref, Medline, CAS, Google Scholar
- 16. . Development and function of group 2 innate lymphoid cells. Curr. Opin. Immunol. 25(2), 148–155 (2013).Crossref, Medline, CAS, Google Scholar
- 17. Innate lymphoid cells promote lung-tissue homeostasis after infection with influenza virus. Nat. Immunol. 12(11), 1045–1054 (2011).Crossref, Medline, CAS, Google Scholar
- 18. . Differentiation and function of group 3 innate lymphoid cells, from embryo to adult. Int. Immunol. 28(1), 35–42 (2016).Medline, Google Scholar
- 19. A human natural killer cell subset provides an innate source of IL-22 for mucosal immunity. Nature 457(7230), 722–725 (2009).Crossref, Medline, CAS, Google Scholar
- 20. Human fetal lymphoid tissue-inducer cells are interleukin 17-producing precursors to RORC+ CD127+ natural killer-like cells. Nat. Immunol. 10(1), 66–74 (2009).Crossref, Medline, CAS, Google Scholar
- 21. Cross-tissue transcriptomic analysis of human secondary lymphoid organ-residing ILC3s reveals a quiescent state in the absence of inflammation. Cell Rep. 21(3), 823–833 (2017).Crossref, Medline, CAS, Google Scholar
- 22. . New insights into the development of lymphoid tissues. Nat. Rev. Immunol. 10(9), 664–674 (2010).Crossref, Medline, Google Scholar
- 23. Nonredundant function of soluble LTalpha3 produced by innate lymphoid cells in intestinal homeostasis. Science 342(6163), 1243–1246 (2013).Crossref, Medline, CAS, Google Scholar
- 24. Innate lymphoid cells are expanded and functionally altered in chronic lymphocytic leukemia. Haematologica 101(11), e461–e464 (2016).Crossref, Medline, Google Scholar
- 25. CD127+ innate lymphoid cells are dysregulated in treatment naive acute myeloid leukemia patients at diagnosis. Haematologica 100(7), e257–260 (2015).Crossref, Medline, CAS, Google Scholar
- 26. ILC2-modulated T cell-to-MDSC balance is associated with bladder cancer recurrence. J. Clin. Invest. 127(8), 2916–2929 (2017). •• Indicates that ILC2/IL-13/MDSC axis plays a potential role in bladder cancer recurrence through in vitro experiment.Crossref, Medline, Google Scholar
- 27. Tumour-derived PGD2 and NKp30-B7H6 engagement drives an immunosuppressive ILC2-MDSC axis. Nat. Commun. 8(1), 593 (2017). •• Shows the potential role of immunosuppressive ILC2-MDSC axis in acute promyelocytic leukemia development through in vitro and in vivo experiments.Crossref, Medline, Google Scholar
- 28. Changes in bone marrow innate lymphoid cell subsets in monoclonal gammopathy: target for IMiD therapy. Blood Adv. 1(25), 2343–2347 (2017).Crossref, Medline, Google Scholar
- 29. Activated innate lymphoid cell populations accumulate in human tumour tissues. BMC Cancer 18(1), 341 (2018).Crossref, Medline, Google Scholar
- 30. . Molecular detection of uterine innate lymphoid cells in the immunological mouse model of pregnancy loss. Int. Immunopharmacol. 68, 1–6 (2019).Crossref, Medline, CAS, Google Scholar
- 31. Regulated expression of nuclear receptor RORgammat confers distinct functional fates to NK cell receptor-expressing RORgammat(+) innate lymphocytes. Immunity 33(5), 736–751 (2010).Crossref, Medline, CAS, Google Scholar
- 32. A T-bet gradient controls the fate and function of CCR6-RORgammat+ innate lymphoid cells. Nature 494(7436), 261–265 (2013).Crossref, Medline, CAS, Google Scholar
- 33. Transcriptional programs define molecular characteristics of innate lymphoid cell classes and subsets. Nat. Immunol. 16(3), 306–317 (2015).Crossref, Medline, CAS, Google Scholar
- 34. . Expansion of human NK-22 cells with IL-7, IL-2, and IL-1beta reveals intrinsic functional plasticity. Proc. Natl Acad. Sci. USA 107(24), 10961–10966 (2010).Crossref, Medline, CAS, Google Scholar
- 35. Human type 1 innate lymphoid cells accumulate in inflamed mucosal tissues. Nat. Immunol. 14(3), 221–229 (2013).Crossref, Medline, CAS, Google Scholar
- 36. Tumor immunoevasion by the conversion of effector NK cells into type 1 innate lymphoid cells. Nat. Immunol. 18(9), 1004–1015 (2017).Crossref, Medline, CAS, Google Scholar
- 37. Peripheral PDGFRalpha(+)gp38(+) mesenchymal cells support the differentiation of fetal liver-derived ILC2. J. Exp. Med. 215(6), 1609–1626 (2018).Crossref, Medline, CAS, Google Scholar
- 38. Differentiation of type 1 ILCs from a common progenitor to all helper-like innate lymphoid cell lineages. Cell 157(2), 340–356 (2014).Crossref, Medline, CAS, Google Scholar
- 39. Lineage relationship analysis of RORgammat+ innate lymphoid cells. Science 330(6004), 665–669 (2010).Crossref, Medline, CAS, Google Scholar
- 40. Innate lymphoid cells: 10 years on. Cell 174(5), 1054–1066 (2018). • Summarizes the nomenclature of innate lymphoid cells (ILCs) and their functions in tissue homeostasis.Crossref, Medline, CAS, Google Scholar
- 41. An Id2(RFP)-reporter mouse redefines innate lymphoid cell precursor potentials. Immunity 50(4), 1054–1068 e1053 (2019).Crossref, Medline, CAS, Google Scholar
- 42. . Innate lymphoid cells. Innate lymphoid cells: a new paradigm in immunology. Science 348(6237), aaa6566 (2015).Crossref, Medline, Google Scholar
- 43. . Human NKp44+IL-22+ cells and LTi-like cells constitute a stable RORC+ lineage distinct from conventional natural killer cells. J. Exp. Med. 207(2), 281–290 (2010).Crossref, Medline, CAS, Google Scholar
- 44. . Notch, Id2, and RORgammat sequentially orchestrate the fetal development of lymphoid tissue inducer cells. J. Exp. Med. 209(4), 729–740 (2012).Crossref, Medline, CAS, Google Scholar
- 45. . A committed precursor to innate lymphoid cells. Nature 508(7496), 397–401 (2014).Crossref, Medline, CAS, Google Scholar
- 46. Single-cell analysis defines the divergence between the innate lymphoid cell lineage and lymphoid tissue-inducer cell lineage. Nat. Immunol. 17(3), 269–276 (2016).Crossref, Medline, CAS, Google Scholar
- 47. . Innate lymphoid cell regulation of adaptive immunity. Immunology 149(2), 123–130 (2016).Crossref, Medline, CAS, Google Scholar
- 48. . Epigenomic views of innate lymphoid cells. Front. Immunol. 8, 1579 (2017).Crossref, Medline, Google Scholar
- 49. . Why innate lymphoid cells? Immunity 48(6), 1081–1090 (2018).Crossref, Medline, CAS, Google Scholar
- 50. Lymphatic endothelial cells control initiation of lymph node organogenesis. Immunity 47(1), 80–92 e84 (2017).Crossref, Medline, CAS, Google Scholar
- 51. . Immune escape mechanisms as a guide for cancer immunotherapy. Clin. Cancer Res. 21(4), 687–692 (2015).Crossref, Medline, CAS, Google Scholar
- 52. Identification of innate IL-5-producing cells and their role in lung eosinophil regulation and antitumor immunity. J. Immunol. 188(2), 703–713 (2012).Crossref, Medline, CAS, Google Scholar
- 53. . Group 2 innate lymphoid cells and CD4+ T cells cooperate to mediate type 2 immune response in mice. Allergy 69(10), 1300–1307 (2014).Crossref, Medline, CAS, Google Scholar
- 54. MHCII-mediated dialog between group 2 innate lymphoid cells and CD4(+) T cells potentiates type 2 immunity and promotes parasitic helminth expulsion. Immunity 41(2), 283–295 (2014).Crossref, Medline, CAS, Google Scholar
- 55. Type 2 innate lymphoid cells drive CD4+ Th2 cell responses. J. Immunol. 192(5), 2442–2448 (2014).Crossref, Medline, CAS, Google Scholar
- 56. CD1a presentation of endogenous antigens by group 2 innate lymphoid cells. Sci. Immunol. 2(18),
eaan5918 (2017).Crossref, Medline, Google Scholar - 57. Identity, regulation and in vivo function of gut NKp46+RORgammat+ and NKp46+RORgammat- lymphoid cells. EMBO J. 30(14), 2934–2947 (2011).Crossref, Medline, CAS, Google Scholar
- 58. Innate lymphoid cells regulate CD4+ T-cell responses to intestinal commensal bacteria. Nature 498(7452), 113–117 (2013).Crossref, Medline, CAS, Google Scholar
- 59. . T cell anergy. Annu. Rev. Immunol. 21, 305–334 (2003).Crossref, Medline, CAS, Google Scholar
- 60. Interleukin-33 and interferon-gamma counter-regulate group 2 innate lymphoid cell activation during immune perturbation. Immunity 43(1), 161–174 (2015).Crossref, Medline, CAS, Google Scholar
- 61. Cutting edge: maresin-1 engages regulatory T cells to limit type 2 innate lymphoid cell activation and promote resolution of lung inflammation. J. Immunol. 194(3), 863–867 (2015).Crossref, Medline, CAS, Google Scholar
- 62. IL-33-mediated protection against experimental cerebral malaria is linked to induction of type 2 innate lymphoid cells, M2 macrophages and regulatory T cells. PLoS Pathog. 11(2), e1004607 (2015).Crossref, Medline, Google Scholar
- 63. Group 2 innate lymphoid cells are critical for the initiation of adaptive T helper 2 cell-mediated allergic lung inflammation. Immunity 40(3), 425–435 (2014).Crossref, Medline, CAS, Google Scholar
- 64. IgE promotes type 2 innate lymphoid cells in murine food allergy. Clin. Exp. Allergy 48(3), 288–296 (2018).Crossref, Medline, CAS, Google Scholar
- 65. Basophils promote innate lymphoid cell responses in inflamed skin. J. Immunol. 193(7), 3717–3725 (2014).Crossref, Medline, CAS, Google Scholar
- 66. Basophil-derived interleukin-4 controls the function of natural helper cells, a member of ILC2s, in lung inflammation. Immunity 40(5), 758–771 (2014).Crossref, Medline, CAS, Google Scholar
- 67. Increased ILC2s in the eosinophilic nasal polyp endotype are associated with corticosteroid responsiveness. Clin. Immunol. 155(1), 126–135 (2014).Crossref, Medline, CAS, Google Scholar
- 68. Group 2 innate lymphocytes (ILC2) are enriched in active eosinophilic esophagitis. J. Allergy Clin. Immunol. 136(3), 792–794 e793 (2015).Crossref, Medline, CAS, Google Scholar
- 69. . Bone marrow type 2 innate lymphoid cells: a local source of interleukin-5 in interleukin-33-driven eosinophilia. Immunology 153(2), 268–278 (2018).Crossref, Medline, CAS, Google Scholar
- 70. Innate lymphoid cells integrate stromal and immunological signals to enhance antibody production by splenic marginal zone B cells. Nat. Immunol. 15(4), 354–364 (2014).Crossref, Medline, CAS, Google Scholar
- 71. Human CD40 ligand-expressing type 3 innate lymphoid cells induce IL-10-producing immature transitional regulatory B cells. J.Allergy Clin. Immunol.
doi:10.1016/j.jaci.2017.07.046 (2017) (Epub ahead of print).Medline, Google Scholar - 72. Microbiota-dependent crosstalk between macrophages and ILC3 promotes intestinal homeostasis. Science 343(6178), 1249288 (2014).Crossref, Medline, Google Scholar
- 73. Commensal lactobacillus controls immune tolerance during acute liver injury in mice. Cell Rep. 21(5), 1215–1226 (2017).Crossref, Medline, CAS, Google Scholar
- 74. Intestinal epithelial tuft cells initiate type 2 mucosal immunity to helminth parasites. Nature 529(7585), 226–230 (2016).Crossref, Medline, CAS, Google Scholar
- 75. Tuft cells, taste-chemosensory cells, orchestrate parasite type 2 immunity in the gut. Science 351(6279), 1329–1333 (2016).Crossref, Medline, CAS, Google Scholar
- 76. . Tuft-cell-derived IL-25 regulates an intestinal ILC2-epithelial response circuit. Nature 529(7585), 221–225 (2016).Crossref, Medline, CAS, Google Scholar
- 77. . Group 2 innate lymphoid cells utilize the IRF4-IL-9 module to coordinate epithelial cell maintenance of lung homeostasis. Mucosal Immunol. 9(1), 275–286 (2016).Crossref, Medline, CAS, Google Scholar
- 78. Pulmonary epithelial cell-derived cytokine TGF-beta1 is a critical cofactor for enhanced innate lymphoid cell function. Immunity 43(5), 945–958 (2015).Crossref, Medline, CAS, Google Scholar
- 79. Group 2 innate lymphoid cells express functional NKp30 receptor inducing type 2 cytokine production. J. Immunol. 196(1), 45–54 (2016).Crossref, Medline, CAS, Google Scholar
- 80. Induction of human regulatory innate lymphoid cells from group 2 innate lymphoid cells by retinoic acid. J. Allergy Clin. Immunol.
doi:10.1016/j.jaci.2018.12.1018 (2019) (Epub ahead of print).Crossref, Google Scholar - 81. Regulation of interleukin-33 and thymic stromal lymphopoietin in human nasal fibroblasts by proinflammatory cytokines. Laryngoscope 122(6), 1185–1192 (2012).Crossref, Medline, CAS, Google Scholar
- 82. Intratumor T helper type 2 cell infiltrate correlates with cancer-associated fibroblast thymic stromal lymphopoietin production and reduced survival in pancreatic cancer. J. Exp. Med. 208(3), 469–478 (2011).Crossref, Medline, Google Scholar
- 83. Thymic stromal lymphopoietin fosters human breast tumor growth by promoting type 2 inflammation. J. Exp. Med. 208(3), 479–490 (2011).Crossref, Medline, CAS, Google Scholar
- 84. . Immune suppressive mechanisms in the tumor microenvironment. Curr. Opin. Immunol. 39, 1–6 (2016).Crossref, Medline, CAS, Google Scholar
- 85. . NK cells and cancer: you can teach innate cells new tricks. Nat. Rev. Cancer 16(1), 7–19 (2016). • Introduces the role of natural killer (NK) cells in immune surveillance against cancer and summarizes new therapeutic approaches for tumor treatment through targeting NK cells.Crossref, Medline, CAS, Google Scholar
- 86. . Control of metastasis by NK cells. Cancer Cell 32(2), 135–154 (2017).Crossref, Medline, CAS, Google Scholar
- 87. . Leveraging natural killer cells for cancer immunotherapy. Immunotherapy 9(6), 487–497 (2017).Link, CAS, Google Scholar
- 88. Polarization of ILC2s in peripheral blood might contribute to immunosuppressive microenvironment in patients with gastric cancer. J. Immunol. Res. 2014, 923135 (2014).Crossref, Medline, Google Scholar
- 89. Mast cells promote small bowel cancer in a tumor stage-specific and cytokine-dependent manner. Proc. Natl Acad. Sci. USA 115(7), 1588–1592 (2018).Crossref, Medline, CAS, Google Scholar
- 90. Mist1 expressing gastric stem cells maintain the normal and neoplastic gastric epithelium and are supported by a perivascular stem cell niche. Cancer Cell 28(6), 800–814 (2015).Crossref, Medline, CAS, Google Scholar
- 91. Innate lymphoid cells sustain colon cancer through production of interleukin-22 in a mouse model. J. Exp. Med. 210(5), 917–931 (2013). •• Demonstrates that in murine model, ILCs promote the development of colon cancer through producing IL-22, which induces Stat3 phosphorylation and proliferation.Crossref, Medline, CAS, Google Scholar
- 92. Card9-dependent IL-1beta regulates IL-22 production from group 3 innate lymphoid cells and promotes colitis-associated cancer. Eur. J. Immunol. 47(8), 1342–1353 (2017).Crossref, Medline, CAS, Google Scholar
- 93. Interleukin-23 is sufficient to induce rapid de novo gut tumorigenesis, independent of carcinogens, through activation of innate lymphoid cells. Mucosal Immunol. 7(4), 842–856 (2014).Crossref, Medline, CAS, Google Scholar
- 94. . IL-12 initiates tumor rejection via lymphoid tissue-inducer cells bearing the natural cytotoxicity receptor NKp46. Nat. Immunol. 11(11), 1030–1038 (2010).Crossref, Medline, CAS, Google Scholar
- 95. Requirement for innate immunity and CD90(+) NK1.1(-) lymphocytes to treat established melanoma with chemo-immunotherapy. Cancer Immunol. Res. 3(3), 296–304 (2015).Crossref, Medline, CAS, Google Scholar
- 96. Tissue microenvironment dictates the fate and tumor-suppressive function of type 3 ILCs. J. Exp. Med. 214(8), 2331–2347 (2017).Crossref, Medline, CAS, Google Scholar
- 97. . Induction of lymphoidlike stroma and immune escape by tumors that express the chemokine CCL21. Science 328(5979), 749–752 (2010).Crossref, Medline, CAS, Google Scholar
- 98. Langerhans cells facilitate UVB-induced epidermal carcinogenesis. J. Invest. Dermatol. 135(11), 2824–2833 (2015).Crossref, Medline, CAS, Google Scholar
- 99. Intratumorally establishing type 2 innate lymphoid cells blocks tumor growth. J. Immunol. 196(5), 2410–2423 (2016).Crossref, Medline, CAS, Google Scholar
- 100. RORgammat(+) innate lymphoid cells promote lymph node metastasis of breast cancers. Cancer Res. 77(5), 1083–1096 (2017). •• Shows the role of ILC3 in promoting lymphatic metastasis of breast cancer by modulating local chemokine milieu in tumor microenvironment through in vitro and in vivo experiments.Crossref, Medline, CAS, Google Scholar
- 101. Interleukin-33/ST2 axis promotes breast cancer growth and metastases by facilitating intratumoral accumulation of immunosuppressive and innate lymphoid cells. Int. J. Cancer 134(7), 1669–1682 (2014).Crossref, Medline, CAS, Google Scholar
- 102. Enhanced circulating ILC2s and MDSCs may contribute to ensure maintenance of Th2 predominant in patients with lung cancer. Mol. Med. Rep. 15(6), 4374–4381 (2017).Crossref, Medline, CAS, Google Scholar
- 103. Type 2 innate lymphocytes actuate immunity against tumours and limit cancer metastasis. Sci. Rep. 8(1), 2924 (2018).Crossref, Medline, Google Scholar
- 104. NCR(+)ILC3 concentrate in human lung cancer and associate with intratumoral lymphoid structures. Nat. Commun. 6, 8280 (2015).Crossref, Medline, CAS, Google Scholar
- 105. Biliary repair and carcinogenesis are mediated by IL-33-dependent cholangiocyte proliferation. J. Clin. Invest. 124(7), 3241–3251 (2014).Crossref, Medline, CAS, Google Scholar
- 106. A distinct innate lymphoid cell population regulates tumor-associated T cells. Nat. Med. 23(3), 368–375 (2017).Crossref, Medline, CAS, Google Scholar
- 107. Activated innate lymphoid cells are associated with a reduced susceptibility to graft-versus-host disease. Blood 124(5), 812–821 (2014).Crossref, Medline, CAS, Google Scholar
- 108. . Group 3 innate lymphoid cells in tissue damage and graft-versus-host disease pathogenesis. Curr. Opin. Hematol. 23(4), 410–415 (2016).Crossref, Medline, CAS, Google Scholar
- 109. Interleukin-22 protects intestinal stem cells from immune-mediated tissue damage and regulates sensitivity to graft versus host disease. Immunity 37(2), 339–350 (2012).Crossref, Medline, CAS, Google Scholar


