[Antihistones antibodies in systemic lupus erythematosus, comparison of three assays: Elisa, dot blot and immunoblot].
OBJECTIVE
The purpose of our study is to determine and compare the sensitivity of an enzyme linked immunosorbent assay (ELISA), a dot blot assay and an immunoblot assay for the detection of the IgG class antihistones antibodies in a population of systemic lupus erythematosus. The correlation between antihistones antibodies and the main clinical features of SLE or between antihistones antibodies and the presence of anti-double-stranded-DNA antibodies were analysed.


METHODS
Serum samples from 126 systemic lupus erythematosus patients, classified according to the criteria of the American College of Rheumatology, were analysed for the presence of antihistones antibodies using a dot blot assay and an ELISA. Antihistones subfractions antibodies were assessed using the immunoblot technique on 88 out of the 126 sera. Serum samples from 50 blood-donors were analyzed as negative controls.


RESULTS
The sensitivity of antihistones antibodies assessed by dot blot assay and ELISA was 69% and 54% respectively, and was lower than that of anti-double-stranded-DNA antibodies (83%). The sensitivity of the immunoblot assay for the detection of antihistones antibodies was 72%. Incidence of autoantibodies against histones H1, H2 A, H2B, H3 and H4 was 60%, 53%, 48%, 36% and 29.5% respectively. We found a correlation between the presence of antihistones antibodies, detected by the dot blot assay and ELISA, and the presence of anti-double-stranded-DNA antibodies. Antihistones antibodies detected by ELISA were correlated with renal disease in systemic lupus erythematosus; they showed a specificity, a positive and a negative predictive value for renal disease in systemic lupus erythematosus higher than those of anti-double-stranded-DNA antibodies.


CONCLUSIONS
The sensitivity of the dot blot assay for the detection of antihistones antibodies is better than that of ELISA, but the latter technique could detect some cases negative by ELISA. Antihistones antibodies detected by ELISA have an important predictive value in the renal complications in systemic lupus erythematosus, better than that of AdsDNA. Antibodies to histone H1 were the most frequent antihistones autoandibodies in systemic lupus erythematosus and they were highly correlated with anti-double-stranded-DNA antibodies and renal disease.
Ghedira
I
I
Service d'Immunologie, Hôpital Farhat-Hached, rue Ibn-El-Jazzar, 4000 Sousse, Tunisie. i_ghedira@yahoo.fr
Landolsi
H
H
Mankai
A
A
Fabien
N
N
Jeddi
M
M
D001323:Autoantibodies / Q000097:blood*; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D006657:Histones / Q000276:immunology*; D006801:Humans; D015151:Immunoblotting / Q000379:methods; D008180:Lupus Erythematosus, Systemic / Q000097:blood / Q000276:immunology*; D012680:Sensitivity and Specificity
D001323:Autoantibodies; D006657:Histones