Khan WA. 16 α-Hydroxyestrone induced adduct generate high affinity autoantibodies in SLE.
Adv Med Sci 2019;
64:72-78. [PMID:
30530105 DOI:
10.1016/j.advms.2018.11.002]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Revised: 10/23/2018] [Accepted: 11/23/2018] [Indexed: 11/19/2022]
Abstract
PURPOSE
Increased 16 α-hydroxyestrone (16 α-OHE1) and autoantibodies against histone H1 (H1) have been well described in systemic lupus erythematosus (SLE), but the combination effects of 16 α-OHE1 and H1 remains unclear. Here, we tried to assess the affinity and binding specificity of SLE autoantibodies against the 16 α-OHE1-H1 adduct. IgG was induced against this adduct and was also used as immunochemical probe for the estimation of 16 α-OHE1 in the serum of SLE patients.
MATERIALS AND METHODS
The affinity and binding specificities of SLE autoantibodies against 16 α-OHE1-H1 were determined by direct binding and inhibition ELISA as well as quantitative precipitation titration in 60 patients and 30 control subjects.
RESULTS
Purified SLE autoantibodies showed greater recognition to 16 α-OHE1-H1 over H1 (p < 0.05) or 16 α-OHE1 (p < 0.001). The relative affinity of SLE autoantibodies for 16 α-OHE1-H1, H1 and 16 α-OHE1 was 1.41 × 10-7, 1.31 × 10-6, and 1.03 × 10-6, respectively. The concentration of 16 α-OHE1 in the sera of SLE patients was significantly higher than controls (p < 0.05) as estimated by anti-16 α-OHE1-H1 antibodies.
CONCLUSIONS
High affinity of 16 α-OHE1-H1 with SLE autoantibodies might suggest an antigenic role of this adduct in the production of these autoantibodies. The anti-16 α-OHE1-H1 antibody is a good immunochemical probe to measure 16 α-OHE1 in different SLE sera.
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