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Antibody responses to de novo identified citrullinated fibrinogen peptides in rheumatoid arthritis and visualization of the corresponding B cells.

Vijay JoshuaLoes SchobersPhilip J TitcombeLena IsraelssonJohan RönnelidMonika HanssonAnca I CatrinaGer J M PruijnVivianne Malmström
Published in: Arthritis research & therapy (2016)
Our data show that several cit-Fib peptides are targeted by autoantibodies in RA, but not in PsA/AS, implicating that these are not due to arthritis but more specific for RA etiology. The RA-associated anti-cit protein response is broad with many parallel immune responses. The association between cit-Fib autoantibodies and the PTPN22 R620W risk allele supports the hypothesis of altered B cell regulation, such as autoreactive B cells evading tolerance checkpoints.
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