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The uric acid crystal receptor Clec12A potentiates type I interferon responses.
Proc. Natl. Acad. Sci. U.S.A. 116, 18544-18549 (2019)
The detection of microbes and damaged host cells by the innate immune system is essential for host defense against infection and tissue homeostasis. However, how distinct positive and negative regulatory signals from immune receptors are integrated to tailor specific responses in complex scenarios remains largely undefined. Clec12A is a myeloid cell-expressed inhibitory C-type lectin receptor that can sense cell death under sterile conditions. Clec12A detects uric acid crystals and limits proinflammatory pathways by counteracting the cell-activating spleen tyrosine kinase (Syk). Here, we surprisingly find that Clec12A additionally amplifies type I IFN (IFN-I) responses in vivo and in vitro. Using retinoic acid-inducible gene I (RIG-I) signaling as a model, we demonstrate that monosodium urate (MSU) crystal sensing by Clec12A enhances cytosolic RNA-induced IFN-I production and the subsequent induction of IFN-I-stimulated genes. Mechanistically, Clec12A engages Src kinase to positively regulate the TBK1-IRF3 signaling module. Consistently, Clec12A-deficient mice exhibit reduced IFN-I responses upon lymphocytic choriomeningitis virus (LCMV) infection, which affects the outcomes of these animals in acute and chronic virus infection models. Thus, our results uncover a previously unrecognized connection between an MSU crystal-sensing receptor and the IFN-I response, and they illustrate how the sensing of extracellular damage-associated molecular patterns (DAMPs) can shape the immune response.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Clec12a ; Type I Interferon ; C-type Lectin Receptor ; Tbk1-irf3 Signaling ; Lcmv; Pattern-recognition; Tyrosine Kinase; Immunity; Virus; Dcir; Activation; Micl; Identification; Inflammation; Components
ISSN (print) / ISBN
0027-8424
e-ISSN
1091-6490
Quellenangaben
Volume: 116,
Issue: 37,
Pages: 18544-18549
Publisher
National Academy of Sciences
Publishing Place
2101 Constitution Ave Nw, Washington, Dc 20418 Usa
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Virology (VIRO)