Serum BAFF and thyroid autoantibodies in autoimmune thyroid disease

Background: This study investigated the association of serum B-lymphocyte activating factor (BAFF) levels with autoimmune thyroid disease (AITD) in a Chinese population. Materials and methods: We enrolled 221 patients with AITD [170 patients with Graves' disease (GD), 51 patients with Hashimoto's thyroiditis (HT)], and 124 healthy controls. Serum BAFF levels, thyroid function and thyroid autoantibody (TAb) levels, including of thyroid-stimulating hormone receptor antibody (TSHRAb), anti-thyroid peroxidase antibody (Anti-TPO Ab), and antithyroglobulin antibody (ATA), were measured at baseline. Results: Serum BAFF levels were higher in the GD, HT, and AITD groups than in the control group. Significant correlations were observed between BAFF and TSHRAb levels (r = 0.238, p = 0.018), between BAFF and Anti-TPO Ab levels (p = 0.038), and between BAFF and ATA titers (p = 0.025) in women but not in men. In addition, serum BAFF levels were significantly associated with free thyroxine (r = 0.430, p = 0.004) and TSHRAb (r = 0.495, p = 0.001) levels in women with active GD but not in those with inactive GD. Conclusions: Serum BAFF levels are increased in GD, HT, and AITD. The correlation between serum BAFF and TAb levels exhibits a dimorphic pattern, particularly in active GD. (C) 2016 Elsevier B.V. All rights reserved.