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Serum antibodies to human leucocyte antigen (HLA)?E, HLA?F and HLA?G in patients with systemic lupus erythematosus (SLE) during disease flares: Clinical relevance of HLA?F autoantibodies #MMPMID26440212
Jucaud V; Ravindranath MH; Terasaki PI; Morales?Buenrostro LE; Hiepe F; Rose T; Biesen R
Clin Exp Immunol 2016[Mar]; 183 (3): 326-40 PMID26440212show ga
T lymphocyte hyperactivity and progressive inflammation in systemic lupus erythematosus (SLE) patients results in over?expression of human leucocyte antigen (HLA)?Ib on the surface of lymphocytes. These are shed into the circulation upon inflammation, and may augment production of antibodies promoting pathogenicity of the disease. The objective was to evaluate the association of HLA?Ib (HLA?E, HLA?F and HLA?G) antibodies to the disease activity of SLE. The immunoglobulin (Ig)G/IgM reactivity to HLA?Ib and ?2m in the sera of 69 German, 29 Mexican female SLE patients and 17 German female controls was measured by multiplex Luminex®?based flow cytometry. The values were expressed as mean florescence intensity (MFI). Only the German SLE cohort was analysed in relation to the clinical disease activity. In the controls, anti?HLA?G IgG predominated over other HLA?Ib antibodies, whereas SLE patients had a preponderance of anti?HLA?F IgG over the other HLA?Ib antibodies. The disease activity index, Systemic Lupus Erythematosus Disease Activity Index (SLEDAI)?2000, was reflected only in the levels of anti?HLA?F IgG. Anti?HLA?F IgG with MFI level of 500?1999 was associated with active SLE, whereas inactive SLE revealed higher MFI (>2000). When anti?HLA?F IgG were cross?reactive with other HLA?Ib alleles, their reactivity was reflected in the levels of anti?HLA?E and ?G IgG. The prevalence of HLA?F?monospecific antibodies in SLE patients was also associated with the clinical disease activity. Anti?HLA?F IgG is possibly involved in the clearance of HLA?F shed from lymphocytes and inflamed tissues to lessen the disease's severity, and thus emerges as a beneficial immune biomarker. Therefore, anti?HLA?Ib IgG should be considered as a biomarker in standard SLE diagnostics.