ICOS regulates the pool of group 2 innate lymphoid cells under homeostatic and inflammatory conditions in mice

European Journal of Immunology
Daniela PaclikChiara Romagnani

Abstract

Group 2 innate lymphoid cells (ILC2s) are innate effectors playing an important role in the defense against helminthic infections and in the pathogenesis of allergic inflammation. Cytokines have been identified as the major stimuli driving ILC2 activation and expansion. Conversely, it is unclear whether costimulatory molecules contribute to regulation of ILC2 functions. ILC2s display high expression of inducible T-cell costimulator (ICOS), which belongs to the CD28 superfamily, and which has been shown to control late effector T-cell functions, and is of utmost importance for the humoral immune response. However, the biological function of ICOS expression on ILC2s is unknown. Here, we show that ICOS signaling in mice regulates ILC2 homeostasis independently of T cells and B cells, by promoting proliferation and accumulation of mature ILC2s in lung and intestine. In a model of IL-33-induced airway inflammation, ICOS controls ILC2 activation and eosinophil infiltration in the lung. Our data identify a role of ICOS in innate immunity and indicate that not only cytokines, but also costimulatory pathways such as those involving ICOS, can contribute to regulate the ILC2 pool. Thus, ICOS costimulation blockade, which is currently unde...Continue Reading

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Related Concepts

Eosinophil
Pathogenic Aspects
Biochemical Pathway
T-Lymphocyte
Pathogenesis
Lung
Regulation of Biological Process
CD28 gene
Lymphoid Cells
ICOS protein, human

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