title: Intraepithelial type 1 innate lymphoid cells are a unique subset of IL-12- and IL-15-responsive IFN-γ-producing cells.
abstract: Mucosal innate lymphoid cell (ILC) subsets promote immune responses to pathogens by producing distinct signature cytokines in response to changes in the cytokine microenvironment. We previously identified human ILC3 distinguished by interleukin-22 (IL-22) secretion. Here we characterized a human ILC1 subset that produced interferon-γ (IFN-γ) in response to IL-12 and IL-15 and had a unique integrin profile, intraepithelial location, hallmarks of TGF-β imprinting, and a memory-activated phenotype. Because tissue-resident memory CD8(+) T cells share this profile, intraepithelial ILC1 may be their innate counterparts. In mice, intraepithelial ILC1 were distinguished by CD160 expression and required Nfil3- and Tbx21-encoded transcription factors for development, but not IL-15 receptor-α, indicating that intraepithelial ILC1 are distinct from conventional NK cells. Intraepithelial ILC1 were amplified in Crohn's disease patients and contributed to pathology in the anti-CD40-induced colitis model in mice. Thus, intraepithelial ILC1 may initiate IFN-γ responses against pathogens but contribute to pathology when dysregulated.
authors: Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA.
authors: Anja
authors: A
authors: Fuchs
authors: William
authors: W
authors: Vermi
authors: Jacob S
authors: JS
authors: Lee
authors: Silvia
authors: S
authors: Lonardi
authors: Susan
authors: S
authors: Gilfillan
authors: Rodney D
authors: RD
authors: Newberry
authors: Marina
authors: M
authors: Cella
authors: Marco
authors: M
authors: Colonna
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000008:administration & dosage; D019013:CD40 Antigens / Q000276:immunology; D003092:Colitis / Q000139:chemically induced / Q000276:immunology*; D003424:Crohn Disease / Q000276:immunology*; D004195:Disease Models, Animal; D005260:Female; D006801:Humans; D018928:Immunity, Mucosal; D007371:Interferon-gamma / Q000378:metabolism; D018664:Interleukin-12 / Q000378:metabolism; D019409:Interleukin-15 / Q000378:metabolism; D007413:Intestinal Mucosa / Q000276:immunology*; D016131:Lymphocyte Subsets / Q000276:immunology*; D008214:Lymphocytes / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout
chemical_list: D000911:Antibodies, Monoclonal; D019013:CD40 Antigens; D019409:Interleukin-15; D018664:Interleukin-12; D007371:Interferon-gamma