Anti-tubulin-α-1C autoantibody in systemic lupus erythematosus: a novel indicator of disease activity and vasculitis manifestations.

A variety of autoantibodies has been involved in the pathogenesis of systemic lupus erythematosus (SLE), some of which are well known and applied as disease biomarkers. This study aimed to determine the prevalence of a novel autoantibody, anti-tubulin-α-1C, in patients with SLE and investigate its clinical significance. Anti-tubulin-α-1C autoantibody levels were determined by enzyme-linked immunosorbent assay (ELISA) in 128 SLE patients, 38 primary Sjögren's syndrome (pSS) patients, and 106 healthy controls (HCs).White blood cell (WBC) count, erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), IgM, IgG, C3, C4, RF, ANA, dsDNA, Sm, AnuA, aCL, anti-SSA, and anti-SSB were measured by standard laboratory techniques. SLE Disease Activity Index (SLEDAI) was evaluated accordingly. Anti-tubulin-α-1C antibody levels were significantly increased in SLE patients. Elevated anti-tubulin-α-1C were correlated with higher levels of SLEDAI, increased titers of anti-Sm antibody, and decreased titers of anti-dsDNA antibody and significantly associated with cutaneous and mucosal vasculitis and milder renal involvement. Anti-tubulin-α-1C may become a novel biomarker indicative of active vasculitis in SLE and could be applied in future clinical practice.