Abstract
Rheumatoid arthritis is an autoimmune disease with 1% prevalence in the industrialized world. The contributions of the inflammasome components Nlrp3, ASC, and caspase-1 in the pathogenesis of collagen-induced arthritis have not been characterized. Here, we show that ASC(-/-) mice were protected from arthritis, whereas Nlrp3(-/-) and caspase-1(-/-) mice were susceptible to collagen-induced arthritis. Unlike Nlrp3(-/-) and caspase-1(-/-) mice, the production of collagen-specific antibodies was abolished in ASC(-/-) mice. This was due to a significantly reduced antigen-specific activation of lymphocytes by ASC(-/-) dendritic cells. Antigen-induced proliferation of purified ASC(-/-) T cells was restored upon incubation with wild type dendritic cells, but not when cultured with ASC(-/-) dendritic cells. Moreover, direct T cell receptor ligation with CD3 and CD28 antibodies induced a potent proliferation of ASC(-/-) T cells, indicating that ASC is specifically required in dendritic cells for antigen-induced T cell activation. Therefore, ASC fulfills a hitherto unrecognized inflammasome-independent role in dendritic cells that is crucial for T cell priming and the induction of antigen-specific cellular and humoral immunity and the onset of collagen-induced arthritis.
MeSH Terms
Animals
Apoptosis Regulatory Proteins
Arthritis, Experimental/etiology,immunology,pathology
Autoantibodies/biosynthesis
CARD Signaling Adaptor Proteins
Carrier Proteins/genetics,immunology
Caspase 1/deficiency,genetics,immunology
Collagen/immunology
Cytoskeletal Proteins/deficiency,genetics,immunology
Dendritic Cells/immunology
Humans
Lymphocyte Activation
Mice
Mice, Inbred C57BL
Mice, Knockout
NLR Family, Pyrin Domain-Containing 3 Protein
T-Lymphocytes/immunology
Chemicals
Apoptosis Regulatory Proteins
Autoantibodies
CARD Signaling Adaptor Proteins
Carrier Proteins
Cytoskeletal Proteins
NLR Family, Pyrin Domain-Containing 3 Protein
Nlrp3 protein, mouse
Pycard protein, mouse
Collagen
Caspase 1
Authors & Affiliations
11 authors, click to expand affiliations / ORCID
Ippagunta Sirish K
Department of Immunology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.
Brand David D
Luo Jiwen
Boyd Kelli L
Calabrese Christopher
Stienstra Rinke
Van de Veerdonk Frank L
Netea Mihai G
Joosten Leo A B
Lamkanfi Mohamed
Kanneganti Thirumala-Devi
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