Anti-C1q antibodies and systemic lupus erythematosus in the Tunisian population |
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Authors: | B. Trad H. Ben Hassine M. Khalifa N. Idriss F. Slama F. Bahri C. Laouani kechrid J. Boukadida R. Sghiri |
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Affiliation: | 1. Laboratory of Microbiology-Immunology, Farhat Hached Hospital, Ibn Al Jazzar street, 4000 Sousse, Tunisia;2. Laboratory of Immunology, Research Unit UR 807, Faculty of Medicine of Sousse, Sousse, Tunisia;3. Department of Internal Medicine and Infectious Diseases, Farhat Hached Hospital, Sousse, Tunisia;4. Department of Internal Medicine, Sahloul Hospital, Sousse, Tunisia |
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Abstract: | ObjectivesThe presence of a wide variety of autoantibodies is a characteristic feature of systemic lupus erythematosus (SLE). Although non-specific, anti-complement C1q (anti-C1q) were shown to correlate with the occurrence of active nephritis. The present study aimed to investigate the prevalence of anti-C1q in Tunisian SLE patients and their association with clinical manifestations, especially renal involvement.Patients and methodsIgG anti-C1q antibodies were assessed by Elisa in 98 SLE patients, 55 patients with rheumatoid arthritis (RA) and 65 healthy individuals (HI).ResultsAnti-C1q were found in 53 (54.1%) patients with SLE, three (5%) patients with RA and six (9.3%) HI. Among the 65 patients with renal involvement, anti-C1q were present in 35 (53.8%) patients. There was no significant association between anti-C1q and renal or extrarenal manifestations. In addition, there was no correlation between anti-C1q titer and SLEDAI index. Anti-C1q were significantly associated with anti-nucleosome (P = 0.001), anti-Sm (P = 0.01) and a low C4 level (P = 0.046). Concomitant presence of anti-C1q and anti-dsDNA antibodies was not associated with renal manifestations.ConclusionOur study shows that prevalence of anti-C1q was comparable with that previously reported in Caucasian populations. These antibodies were associated with a low C4 level. However, there was no association between anti-C1q and renal involvement or severity of nephritis. |
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