期刊
ANNALS OF THE RHEUMATIC DISEASES
卷 74, 期 12, 页码 2224-2235出版社
BMJ PUBLISHING GROUP
DOI: 10.1136/annrheumdis-2014-205496
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- Deutsche Forschungsgemeinschaft [AN372/9-2, LE2621/3-1, GRK 1202]
Objectives The NLRP3/ASC inflammasome drives host defence and autoinflammatory disorders by activating caspase-1 to trigger the secretion of mature interleukin (IL)-1 beta/IL-18, but its potential role in autoimmunity is speculative. Methods We generated and phenotyped Nlrp3-deficient, Asc-deficient, Il-1r-deficient and Il-18-deficient C57BL/6-lpr/lpr mice, the latter being a mild model of spontaneous lupus-like autoimmunity. Results While lack of IL-1R or IL-18 did not affect the C57BL/6-lpr/lpr phenotype, lack of NLRP3 or ASC triggered massive lymphoproliferation, lung T cell infiltrates and severe proliferative lupus nephritis within 6 months, which were all absent in age-matched C57BL/6-lpr/lpr controls. Lack of NLRP3 or ASC increased dendritic cell and macrophage activation, the expression of numerous proinflammatory mediators, lymphocyte necrosis and the expansion of most T cell and B cell subsets. In contrast, plasma cells and autoantibody production were hardly affected. This unexpected immunosuppressive effect of NLRP3 and ASC may relate to their known role in SMAD2/3 phosphorylation during tumour growth factor (TGF)-beta receptor signalling, for example, Nlrp3-deficiency and Asc-deficiency significantly suppressed the expression of numerous TGF-beta target genes in C57BL/6-lpr/lpr mice and partially recapitulated the known autoimmune phenotype of Tgf-beta 1-deficient mice. Conclusions These data identify a novel non-canonical immunoregulatory function of NLRP3 and ASC in autoimmunity.
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