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Oliphant, Christopher J.; Hwang, You Yi; Walker, Jennifer A.; Salimi, Maryam; Wong, See Heng; Brewer, James M.; Englezakis, Alexandros; Barlow, Jillian L.; Hams, Emily; Scanlon, Seth T.; Ogg, Graham S.; Fallon, Padraic G.; McKenzie, Andrew N.J.
Immunity (Cambridge, Mass.), 08/2014, Letnik: 41, Številka: 2Journal Article
Group 2 innate lymphoid cells (ILC2s) release interleukin-13 (IL-13) during protective immunity to helminth infection and detrimentally during allergy and asthma. Using two mouse models to deplete ILC2s in vivo, we demonstrate that T helper 2 (Th2) cell responses are impaired in the absence of ILC2s. We show that MHCII-expressing ILC2s interact with antigen-specific T cells to instigate a dialog in which IL-2 production from T cells promotes ILC2 proliferation and IL-13 production. Deletion of MHCII renders IL-13-expressing ILC2s incapable of efficiently inducing Nippostrongylus brasiliensis expulsion. Thus, during transition to adaptive T cell-mediated immunity, the ILC2 and T cell crosstalk contributes to their mutual maintenance, expansion and cytokine production. This interaction appears to augment dendritic-cell-induced T cell activation and identifies a previously unappreciated pathway in the regulation of type-2 immunity. Display omitted •Genetic ablation of ILC2s impairs type-2 immunity•MHCII-expressing ILC2s potentiate Th2 responses•IL-2 from T cells promotes ILC2 proliferation and expression of type-2 cytokines•MHCII and IL-13 expression by ILC2s is important for N. brasiliensis expulsion Type-2 innate lymphoid cells proliferate and release interleukin-13 during protective immunity to helminth infection and detrimentally during allergy and asthma. McKenzie and colleagues establish that these activities are potentiated through an MHC class II-mediated dialogue with T cells.
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