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Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Rheumatology+(Oxford) 2017 ; 56 (7): 1217-26 Nephropedia Template TP
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Carbamylated albumin is one of the target antigens of anti-carbamylated protein antibodies #MMPMID28398552
Nakabo S; Hashimoto M; Ito S; Furu M; Ito H; Fujii T; Yoshifuji H; Imura Y; Nakashima R; Murakami K; Kuramoto N; Tanaka M; Satoh J; Ishigami A; Morita S; Mimori T; Ohmura K
Rheumatology (Oxford) 2017[Jul]; 56 (7): 1217-26 PMID28398552show ga
Objectives. Anti-carbamylated protein (anti-CarP) antibodies are detected in RA patients. Fetal calf serum is used as an antigen source in anti-CarP ELISA, and the precise target antigens have not been found. We aimed to identify the target antigens of anti-CarP antibodies.Methods. Western blotting of anti-CarP antibodies was conducted. Anti-carbamylated human albumin (CarALB) antibody was detected by in-house ELISA for 493 RA patients and 144 healthy controls (HCs). An inhibition ELISA of anti-CarP antibodies by CarALB and citrullinated albumin (citALB) was performed using eight RA patients? sera. Serum CarALB was detected by liquid chromatography?tandem mass spectroscopy (LC/MS/MS), and the serum MPO concentration was measured by ELISA.Results. We focused on carbamylated albumin because it corresponded to the size of the thickest band detected by western blotting of anti-CarP antibodies. Anti-CarALB antibody was detected in 31.4% of RA patients, and the correlation of the titres between anti-CarALB and anti-CarP was much closer than that between anti-citALB and anti-CCP antibodies (? = 0.59 and ? = 0.16, respectively). The inhibition ELISA showed that anti-CarP antibodies were inhibited by CarALB, but not by citALB. CarALB was detected in sera from RA patients by LC/MS/MS. The serum MPO concentration was correlated with disease activity and was higher in RA patients with anti-CarALB antibody than in those without.Conclusion. We found that carbamylated albumin is a novel target antigen of anti-CarP antibodies, and it is the first reported target antigen that has not been reported as the target of ACPA.