| First Author | Xu X | Year | 2018 |
| Journal | Nat Immunol | Volume | 19 |
| Issue | 6 | Pages | 547-560 |
| PubMed ID | 29777223 | Mgi Jnum | J:282385 |
| Mgi Id | MGI:6380772 | Doi | 10.1038/s41590-018-0112-4 |
| Citation | Xu X, et al. (2018) CARD9(S12N) facilitates the production of IL-5 by alveolar macrophages for the induction of type 2 immune responses. Nat Immunol 19(6):547-560 |
| abstractText | The adaptor CARD9 functions downstream of C-type lectin receptors (CLRs) for the sensing of microbial infection, which leads to responses by the TH1 and TH17 subsets of helper T cells. The single-nucleotide polymorphism rs4077515 at CARD9 in the human genome, which results in the substitution S12N (CARD9(S12N)), is associated with several autoimmune diseases. However, the function of CARD9(S12N) has remained unknown. Here we generated CARD9(S12N) knock-in mice and found that CARD9(S12N) facilitated the induction of type 2 immune responses after engagement of CLRs. Mechanistically, CARD9(S12N) mediated CLR-induced activation of the non-canonical transcription factor NF-kappaB subunit RelB, which initiated production of the cytokine IL-5 in alveolar macrophages for the recruitment of eosinophils to drive TH2 cell-mediated allergic responses. We identified the homozygous CARD9 mutation encoding S12N in patients with allergic bronchopulmonary aspergillosis and revealed activation of RelB and production of IL-5 in peripheral blood mononuclear cells from these patients. Our study provides genetic and functional evidence demonstrating that CARD9(S12N) can turn alveolar macrophages into IL-5-producing cells and facilitates TH2 cell-mediated pathologic responses. |
