TY - JOUR
T1 - IL-2 is a critical regulator of group 2 innate lymphoid cell function during pulmonary inflammation
AU - Roediger, Ben
AU - Kyle, Ryan
AU - Tay, Szun S.
AU - Mitchell, Andrew J.
AU - Bolton, Holly A.
AU - Guy, Thomas V.
AU - Tan, Sioh Yang
AU - Forbes-Blom, Elizabeth
AU - Tong, Philip L.
AU - Köller, Yasmin
AU - Shklovskaya, Elena
AU - Iwashima, Makio
AU - McCoy, Kathy D.
AU - Le Gros, Graham
AU - Fazekas De St Groth, Barbara
AU - Weninger, Wolfgang
PY - 2015/12/1
Y1 - 2015/12/1
N2 - Background Group 2 innate lymphoid cells (ILC2) have been implicated in the pathogenesis of allergic lung diseases. However, the upstream signals that regulate ILC2 function during pulmonary inflammation remain poorly understood. ILC2s have been shown to respond to exogenous IL-2, but the importance of endogenous IL-2 in ILC2 function in vivo remains unclear. Objective We sought to understand the role of IL-2 in the regulation of ILC2 function in the lung. Methods We used histology, flow cytometry, immunohistochemistry, ELISA, and quantitative PCR with knockout and reporter mice to dissect pulmonary ILC2 function in vivo. We examined the role of ILC2s in eosinophilic crystalline pneumonia, an idiopathic type 2 inflammatory lung condition of mice, and the effect of IL-2 deficiency on this disease. We determined the effect of IL-2 administration on pulmonary ILC2 numbers and function in mice in the steady state and after challenge with IL-33. Results We discovered an unexpected role for innate cell-derived IL-2 as a major cofactor of ILC2 function during pulmonary inflammation. Specifically, we found that IL-2 was essential for the development of eosinophilic crystalline pneumonia, a type 2 disease characterized by increased numbers of activated ILC2s. We show that IL-2 signaling serves 2 distinct functions in lung ILC2s, namely promoting cell survival/proliferation and serving as a cofactor for the production of type 2 cytokines. We further demonstrate that group 3 innate lymphoid cells are an innate immune source of IL-2 in the lung. Conclusion Innate cell-derived IL-2 is a critical cofactor in regulating ILC2 function in pulmonary type 2 pathology.
AB - Background Group 2 innate lymphoid cells (ILC2) have been implicated in the pathogenesis of allergic lung diseases. However, the upstream signals that regulate ILC2 function during pulmonary inflammation remain poorly understood. ILC2s have been shown to respond to exogenous IL-2, but the importance of endogenous IL-2 in ILC2 function in vivo remains unclear. Objective We sought to understand the role of IL-2 in the regulation of ILC2 function in the lung. Methods We used histology, flow cytometry, immunohistochemistry, ELISA, and quantitative PCR with knockout and reporter mice to dissect pulmonary ILC2 function in vivo. We examined the role of ILC2s in eosinophilic crystalline pneumonia, an idiopathic type 2 inflammatory lung condition of mice, and the effect of IL-2 deficiency on this disease. We determined the effect of IL-2 administration on pulmonary ILC2 numbers and function in mice in the steady state and after challenge with IL-33. Results We discovered an unexpected role for innate cell-derived IL-2 as a major cofactor of ILC2 function during pulmonary inflammation. Specifically, we found that IL-2 was essential for the development of eosinophilic crystalline pneumonia, a type 2 disease characterized by increased numbers of activated ILC2s. We show that IL-2 signaling serves 2 distinct functions in lung ILC2s, namely promoting cell survival/proliferation and serving as a cofactor for the production of type 2 cytokines. We further demonstrate that group 3 innate lymphoid cells are an innate immune source of IL-2 in the lung. Conclusion Innate cell-derived IL-2 is a critical cofactor in regulating ILC2 function in pulmonary type 2 pathology.
KW - eosinophilic crystalline pneumonia
KW - Group 2 innate lymphoid cells
KW - IL-13
KW - IL-2
KW - pulmonary inflammation
UR - http://www.scopus.com/inward/record.url?scp=84946056259&partnerID=8YFLogxK
U2 - 10.1016/j.jaci.2015.03.043
DO - 10.1016/j.jaci.2015.03.043
M3 - Article
C2 - 26025126
AN - SCOPUS:84946056259
SN - 0091-6749
VL - 136
SP - 1653
EP - 1663
JO - Journal of Allergy and Clinical Immunology
JF - Journal of Allergy and Clinical Immunology
IS - 6
ER -