T-cell autoreactivity to citrullinated autoantigenic peptides in rheumatoid arthritis patients carrying HLA-DRB1 shared epitope allelesReportar como inadecuado

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Arthritis Research and Therapy

, 14:R118

First Online: 17 May 2012Received: 30 November 2011Revised: 20 January 2012Accepted: 17 May 2012


IntroductionAnti-citrullinated peptide antibodies are found in rheumatoid arthritis RA patients with HLA-DRβ chains encoding the shared epitope SE sequence. Citrullination increases self-antigen immunogenicity, through increased binding affinity to SE-containing HLA-DR molecules. To characterise T-cell autoreactivity towards citrullinated self-epitopes, we profiled responses of SE healthy controls and RA patients to citrullinated and unmodified epitopes of four autoantigens.

MethodsWe compared T-cell proliferative and cytokine responses to citrullinated and native type II collagen 1,237 to 1,249, vimentin 66 to 78, aggrecan 84 to 103 and fibrinogen 79 to 91 in six SE healthy controls and in 21 RA patients with varying disease duration. Cytokine-producing cells were stained after incubation with peptide in the presence of Brefeldin-A.

ResultsAlthough proliferative responses were low, IL-6, IL-17 and TNF were secreted by CD4 T cells of SE RA patients and healthy controls, as well as IFNγ and IL-10 secreted by RA patients, in response to citrullinated peptides. Of the epitopes tested, citrullinated aggrecan was most immunogenic. Patients with early RA were more likely to produce IL-6 in response to no epitope or to citrullinated aggrecan, while patients with longstanding RA were more likely to produce IL-6 to more than one epitope. Cytokine-producing CD4 T cells included the CD45RO and CD45RO and the CD28 and CD28 subsets in RA patients.

ConclusionProinflammatory cytokines were produced by CD4 T cells in SE individuals in response to citrullinated self-epitopes, of which citrullinated aggrecan was most immunogenic. Our data suggest that the T-cell response to citrullinated self-epitopes matures and diversifies with development of RA.

AbbreviationsACPAanti-citrullinated peptide antibody



mAbmonoclonal antibody

P4fourth anchoring pocket

PBperipheral blood

PBMCperipheral blood mononuclear cells

RArheumatoid arthritis

SEshared epitope

TNFtumour necrosis factor.

Electronic supplementary materialThe online version of this article doi:10.1186-ar3848 contains supplementary material, which is available to authorized users.

Soi Cheng Law, Shayna Street contributed equally to this work.

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Fuente: https://link.springer.com/

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