PMID: 15383579Sep 24, 2004Paper

CpG DNA induces IgG class switch DNA recombination by activating human B cells through an innate pathway that requires TLR9 and cooperates with IL-10

The Journal of Immunology : Official Journal of the American Association of Immunologists
Bing HeAndrea Cerutti

Abstract

TLRs are pattern recognition receptors that initiate innate immune responses. TLR9 detects microbial DNA with hypomethylated CpG motifs and in humans is preferentially expressed by IFN-alpha-producing plasmacytoid dendritic cells and B cells. In addition to favoring IFN-alpha release, TLR9 signals B cell activation, proliferation, and IgM production. Recent findings suggest that CpG DNA-TLR9 interaction plays a key role in systemic lupus erythematosus and rheumatoid arthritis, two autoimmune disorders characterized by dysregulated production of DNA-reactive IgG. We show that CpG DNA initiates germline C(gamma)1, C(gamma)2, and C(gamma)3 gene transcription by activating B cells through a TLR9-mediated NF-kappaB-Rel-dependent innate pathway that cooperates with IL-10 through STAT proteins and IFN-responsive factors. This pathway is inhibited by chloroquine, a drug that attenuates the clinical manifestations of IgG-mediated autoimmune disorders. Germline C(gamma) gene transcription is associated with up-regulation of activation-induced cytidine deaminase, a key element of the B cell class switch-inducing machinery, and is followed by class switch DNA recombination from C(micro) to C(gamma)1, C(gamma)2, and C(gamma)3. Subsequent Ig...Continue Reading

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