alexa Anti-citrullinated collagen type I antibody is a target of autoimmunity in rheumatoid arthritis.
Immunology

Immunology

International Journal of Inflammation, Cancer and Integrative Therapy

Author(s): Suzuki A, Yamada R, OhtakeYamanaka M, Okazaki Y, Sawada T,

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Abstract Rheumatoid arthritis (RA) is one of the most common autoimmune diseases, but its autoimmune mechanisms are not clearly understood. Recently, anti-citrullinated peptide antibodies have been specifically observed in sera of RA patients. Furthermore, we identified RA-susceptible variant in a gene encoding citrullinating enzyme, peptidylarginine deiminase type 4 (PADI4). Therefore, we hypothesized that proteins which are modified in RA synovium by PADI4 act as autoantigens. Subsequently, we obtained human collagen type I (huCI) as one of the autoantigens using a RA synoviocyte cDNA library by immunoscreening. We also investigated that the levels of anti-citrullinated huCI were significantly higher in RA patient sera than in normal control sera with high specificity (99\%) and positively correlated with the levels of anti-cyclic citrullinated peptide (anti-CCP) antibodies. We concluded that huCI is a novel substrate protein of PADIs and that citrullinated huCI is a candidate autoantigen of RA. This article was published in Biochem Biophys Res Commun and referenced in International Journal of Inflammation, Cancer and Integrative Therapy

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