Abstract:
OBJECTIVE:To compare anti-malondialdehyde-acetaldehyde (MAA) antibody concentrations between rheumatoid arthritis (RA) patients and healthy and rheumatic disease controls. METHODS:Anti-MAA antibody (IgA, IgM, IgG) was measured using ELISA and banked serum from patients with RA (n = 284), osteoarthritis (OA, n = 330), spondyloarthropathy (SpA, n = 50), and systemic lupus erythematosus (SLE, n = 88) as well as healthy controls (n = 82). Anti-MAA antibody concentrations and the frequency of positivity were compared across groups. Multivariable linear regression analysis limited to RA and OA patients (due to sample size and data availability) was used to identify factors associated with anti-MAA antibody concentrations. RESULTS:Although RA patients demonstrated among the highest circulating concentrations across isotypes, only IgA anti-MAA antibody was significantly higher than all other groups (p ≤ 0.02). Proportions (7% to 74%) of OA and SLE (less so for SpA) samples were positive for anti-MAA antibody, limiting the discriminatory capacity of anti-MAA antibody in RA (positive in 18% to 80%). In analyses limited to those with RA or OA, factors associated with higher anti-MAA antibody concentrations included RA case status, younger age (IgM), male sex (IgG), African American race (IgA, IgG) and current smoking (IgA). C-reactive protein levels and comorbidities were not associated with anti-MAA antibody concentrations. CONCLUSION:With the possible exception of the IgA isotype, serum anti-MAA antibodies measured with currently available assays do not appear to adequately discriminate RA from other rheumatic conditions. With the identification of specific proteins that are MAA-modified in diseased tissues and requisite assay refinement, anti-MAA antibody holds potential promise as a biomarker in RA.
journal_name
Int Immunopharmacoljournal_title
International immunopharmacologyauthors
Mikuls TR,Duryee MJ,England BR,Anderson DR,Hearth-Holmes M,Su K,Michaud K,Payne JB,Sayles H,Hunter C,McGowan JD,Klassen LW,Thiele GMdoi
10.1016/j.intimp.2018.01.022subject
Has Abstractpub_date
2018-03-01 00:00:00pages
113-118eissn
1567-5769issn
1878-1705pii
S1567-5769(18)30022-5journal_volume
56pub_type
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