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Autoantibodies Against Albumin in Patients With Systemic Lupus Erythematosus

Nehring, Josephine
Schirmbeck, Lucia A
Friebus-Kardash, Justa
Dubler, Denise
Huynh-Do, Uyen
Trendelenburg, Marten
Published in Frontiers in Immunology. 2018, vol. 9, p. 2090
Abstract Objectives: Autoantibodies and aberrant immune complexes are pathological hallmarks of systemic lupus erythematosus (SLE). This study aimed to determine the occurrence of IgG autoantibodies against human serum albumin (anti-HSA IgG) and their potential association with antibodies against bovine serum albumin (anti-BSA IgG) in patients with SLE. Methods: Sera of 180 SLE patients included to the Swiss SLE Cohort Study and 188 age- and sex-matched healthy controls were evaluated. Levels of anti-HSA IgG and anti-BSA IgG were quantified by ELISA. Selected samples were further characterized using serum fractions obtained by fast liquid chromatography (FPLC). Results: SLE patients had increased levels of anti-HSA IgG (p = 0.002) but similar levels of anti-BSA IgG compared to matched healthy controls. Anti-HSA IgG levels correlated with the SLE Disease Activity Index (SLEDAI), which was more pronounced in patients with an physician's global assessment (PGA) of ≥ 1 (r = 0.309, p = 0.0066). Anti-HSA IgG was partially complexed with serum albumin but also occurred as monomeric autoantibodies in highly positive SLE patients. A positive correlation between anti-HSA IgG and anti-BSA IgG was found that was stronger in SLE patients than in healthy controls (r = 0.3172, p < 0.001 vs. r = 0.2122, p < 0.0035). Binding of anti-BSA IgG was inhibited partially in the presence of HSA in samples with double positivity for anti-HSA and anti-BSA (median inhibition 47.9%, range 0.9-100%) and vice versa. Conclusion: In SLE patients there is an increased prevalence of anti-HSA IgG antibodies that are associated with SLE disease activity.
PMID: 30333817
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NEHRING, Josephine et al. Autoantibodies Against Albumin in Patients With Systemic Lupus Erythematosus. In: Frontiers in Immunology, 2018, vol. 9, p. 2090. https://archive-ouverte.unige.ch/unige:111275

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Deposited on : 2018-11-21

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