4.5 Article

A critical role of Dectin-1 in hypersensitivity pneumonitis

Journal

INFLAMMATION RESEARCH
Volume 65, Issue 3, Pages 235-244

Publisher

SPRINGER BASEL AG
DOI: 10.1007/s00011-015-0910-1

Keywords

Dectin-1; Hypersensitivity pneumonitis; Th17; Trichosporon asahii

Funding

  1. Kanazawa Medical University (PR)
  2. Ministry of Education, Culture, Sports, Science and Technology of Japan [22590431, 2546060]
  3. Grants-in-Aid for Scientific Research [16K09703, 22590431, 25460601, 15K21745, 15H05935] Funding Source: KAKEN

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Objectives and design Hypersensitivity pneumonitis (HP) is a pulmonary disease caused by repeated exposure to various aspiration antigens, including bacteria and fungi. Although TLRs are known to be required for the generation of HP triggered by bacteria, the significance of fungal receptors remains unclear. The present study aimed to investigate whether Dectin-1 and Dectin-2 contribute to the development of experimental HP triggered by the fungus Trichosporon asahii (T. asahii) that causes summer-type HP. Materials and methods We investigated the binding between Dectin-Fc protein and T. asahii by a dot blot assay. We performed the histological and flow cytometric analysis in the HP model using Dectin-1-deficient (Dectin-1(-/-)) and Dectin-2(-/-) mice. We also investigated Th17/Th1 responses in lung cells, and measured an IL-17-promoting cytokine IL-23 from bone marrow-derived dendritic cells (BMDCs) by ELISA. Results Dectin-1 bound more strongly to T. asahii than Dectin-2. Dectin-1(-/-) mice barely developed HP, whereas both wild-type mice and Dectin-2(-/-) mice developed similar lung diseases. Dectin-1 deficiency decreased the infiltration of neutrophils and monocyte-derived macrophages and repressed the expansion of lung CD4(+)IL-17A(+) cells. The production of IL-23 p19 was reduced in Dectin-1(-/-) BMDCs. Conclusions These data suggested Dectin-1 plays a critical role in the development of fungus-induced HP.

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