4.5 Article

Screening Citrullinated Proteins in Synovial Tissues of Rheumatoid Arthritis Using 2-dimensional Western Blotting

Journal

JOURNAL OF RHEUMATOLOGY
Volume 40, Issue 3, Pages 219-227

Publisher

J RHEUMATOL PUBL CO
DOI: 10.3899/jrheum.120751

Keywords

RHEUMATOID ARTHRITIS; CITRULLINATED PROTEINS; AUTOANTIBODY; PROTEOMICS; 2-D WESTERN BLOTTING

Categories

Funding

  1. National Natural Science Foundation of China [30972720, 81171990]
  2. National Basic Research Program of China [2010CB529105]
  3. Shandong Taishan Scholarship

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Objective. Citrullination, a reaction converting arginine residue into citrulline residue, is essential for autoimmunity of rheumatoid arthritis (RA). We conducted 2-dimensional Western blot analyses (2-D WB) to screen for novel citrullinated proteins in synovial tissues from patients with RA. Methods. Total proteins were extracted from the synovial membranes of patients with RA (n = 10) and pooled. Four identical 2-D electrophoresis (2-DE) gels were prepared, and 2 gels were trans-blotted to polyvinylidene fluoride membranes that were separately probed with sera from patients with RA (n = 10) or an anticitrulline antibody. The protein profiles of the 2-DE gels were compared with the hybridization results on a global level. The immunoreactive protein spots were collected from the 2-DE gels and identified using mass spectrometry. Proteins that were detected by both RA sera and anticitrulline antibody were considered citrullinated proteins. The result was confirmed through routine WB, immunoprecipitation, and ELISA. Autoantibodies against these potential antigens were also examined in the blood of patients with RA by ELISA. Results. RA sera and the anticitrulline antibody on 2-D WB detected alpha-1-antitrypsin (A1AT), dynein heavy-chain 3, fibrinogen beta chain, keratin type II cuticular Hb4 (KRT84), lumican, tubulin beta-chain (TUBB), and vimentin. A1AT, KRT84, and TUBB had high expression in the synovial membranes (n = 5) of patients with RA and A1AT and KRT84 had high expression in RA synovial fluids (n = 40). A1AT, KRT84, and TUBB immunoprecipitated from synovial tissues showed citrullination. A high level of autoantibodies against KRT84 was detected in the blood of patients with RA (n = 92) compared to that of healthy controls (n = 92). Conclusion. Our study identified some new citrullinated proteins in RA synovial tissues using 2-D WB. (First Release Dec 15 2012; J Rheumatol 2013;40:219-27; doi:10.3899/jrheum.120751)

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