title: IL-17 production is dominated by gammadelta T cells rather than CD4 T cells during Mycobacterium tuberculosis infection.
abstract: IL-17 is a cytokine produced by T cells in response to IL-23. Recent data support a new subset of CD4 Th cells distinct from Th1 or Th2 cells that produce IL-17 and may contribute to inflammation. In this study, we demonstrate that, in naive mice, as well as during Mycobacterium tuberculosis infection, IL-17 production is primarily from gammadelta T cells and other non-CD4(+)CD8(+) cells, rather than CD4 T cells. The production of IL-17 by these cells is stimulated by IL-23 alone, and strongly induced by the cytokines, including IL-23, produced by M. tuberculosis-infected dendritic cells. IL-23 is present in the lungs early in infection and the IL-17-producing cells, such as gammadelta T cells, may represent a central innate protective response to pulmonary infection.
authors.affiliation: Department of Molecular Genetics and Biochemistry, Biomedical Science Tower, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA.
authors.forename: Euan
authors.initials: E
authors.lastname: Lockhart
authors.forename: Angela M
authors.initials: AM
authors.lastname: Green
authors.forename: JoAnne L
authors.initials: JL
authors.lastname: Flynn
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000276:immunology / Q000382:microbiology; D005260:Female; D005434:Flow Cytometry; D020381:Interleukin-17 / Q000096:biosynthesis*; D053759:Interleukin-23; D053760:Interleukin-23 Subunit p19; D007378:Interleukins / Q000276:immunology / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D009169:Mycobacterium tuberculosis / Q000276:immunology; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000276:immunology / Q000378:metabolism*; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D014376:Tuberculosis / Q000276:immunology*
chemical_list: C508841:Il23a protein, mouse; D020381:Interleukin-17; D053759:Interleukin-23; D053760:Interleukin-23 Subunit p19; D007378:Interleukins; D016692:Receptors, Antigen, T-Cell, gamma-delta