Innate IL-13–producing nuocytes arise during allergic lung inflammation and contribute to airways hyperreactivity

• Published in: Journal of allergy and clinical immunology 2012-01, Vol.129 (1), p.191-198.e4
• Main Authors: Barlow, Jillian L., PhD, Bellosi, Agustin, PhD, Hardman, Clare S., BSc, Drynan, Lesley F., MSc, Wong, See Heng, PhD, Cruickshank, James P, McKenzie, Andrew N.J., PhD
• Format: Article
• Language: English
• Subjects: Administration, Intranasal; Allergies; Allergy and Immunology; Animals; asthma; Asthma - genetics; Asthma - immunology; Asthma - metabolism; Biological and medical sciences; Bronchial Hyperreactivity - genetics; Bronchial Hyperreactivity - immunology; Bronchial Hyperreactivity - metabolism; Chronic obstructive pulmonary disease, asthma; Cloning; Cytokines - administration & dosage; Cytokines - genetics; Cytokines - immunology; Disease Models, Animal; Fundamental and applied biological sciences. Psychology; Fundamental immunology; IL-13; IL-25; IL-33; Immune system; Immunity, Innate; Immunopathology; Interleukin-13 - biosynthesis; Lymphocytes; Medical sciences; Mice; Mice, Inbred BALB C; Mice, Transgenic; Nuocytes; Pneumology; Pneumonia - genetics; Pneumonia - immunology; Pneumonia - metabolism; Sarcoidosis. Granulomatous diseases of unproved etiology. Connective tissue diseases. Elastic tissue diseases. Vasculitis; Studies
• ISSN: 0091-6749; 1097-6825
• DOI: 10.1016/j.jaci.2011.09.041

Background IL-4, IL-5, and IL-13 are thought to be central to the allergic asthmatic response. Previous work supposed that the essential source of these cytokines was CD4+ TH 2 cells. However, more recent studies have suggested that other innate production of type 2 cytokines might be as important. Objectives Nuocytes are a novel population of IL-13–producing innate cells, which are critical for protective immunity in Nippostrongylus brasiliensis infection. Given this, we investigated the potential existence and functional importance of nuocytes in experimental allergic asthma. Methods We generated Il4+/eGFP Il13+/Tomato dual-reporter mice to study cytokine-producing cells during allergic inflammation. We adoptively transferred innate IL-13–producing cells to investigate their role in airways hyperreactivity (AHR). Results We show that allergen-induced nuocytes infiltrate the lung and are a major innate source of IL-13. CD4+ T cells in the lung almost exclusively express only IL-13, whereas IL-4–producing T cells were restricted to the draining lymph nodes. Intranasal administration of IL-25 or IL-33 induced IL-13–producing nuocytes in the BAL fluid. Strikingly, adoptive transfer of wild-type nuocytes, but not Il13−/− nuocytes, into Il13−/− mice, which are normally resistant to IL-25–induced AHR, restored airways resistance and lung cell infiltration. Conclusions These findings identify nuocytes as a novel cell type in allergic lung inflammation and an innate source of IL-13 that can directly induce AHR in the absence of IL-13–producing CD4+ T cells. These data highlight nuocytes as an important new consideration in the development of future allergic asthma therapy.