Eman Eissa1, Botros Morcos1, Dalia Dorgham2, Naglaa Kholoussi1

1Department of Immunogenetics, National Research Centre, Cairo, Egypt
2Department of Rheumatology and Rehabilitation, Faculty of Medicine, Cairo University, Cairo, Egypt

Keywords: Complement factor H, factor H autoantibodies, juvenile-onset systemic lupus erythematosus, nephritis.


Objectives: This study aims to evaluate the expression pattern of factor H in peripheral blood and the frequency of factor H autoantibodies in plasma of juvenile-onset systemic lupus erythematosus (jSLE) patients compared to healthy controls.

Patients and methods: Between March 2019 and October 2019, a total of 30 healthy individuals (3 males, 27 females; mean age: 26±7.4 years; range, 18 to 40 years) and 65 jSLE patients (age of onset ≤16 years) (2 males, 63 females; mean age: 23.4±7 years; range, 15 to 38 years) were included. Factor H expression pattern was examined in blood of all subjects using quantitative real-time polymerase chain reaction and the frequency of factor H autoantibodies was estimated in plasma using enzyme-linked immunosorbent assay.

Results: Factor H expression was significantly downregulated in jSLE patients compared to healthy controls (p<0.01). A significant underexpression of factor H was observed in jSLE patients with nephritis compared to those without nephritis (p<0.03), while there was no association of factor H expression levels with any of the other clinical and serological features, disease activity or disease damage index of patients. Only 5% of jSLE patients were positive for factor H autoantibodies without any correlations with the clinical data or disease activity of patients.

Conclusion: Our study results suggest that factor H expression can be dysregulated in jSLE patients.

Citation: Eissa E, Morcos B, Dorgham D, Kholoussi N. Dysregulation of complement factor H in juvenile-onset systemic lupus erythematosus patients. Arch Rheumatol 2022;37(3):417-423.

Ethics Committee Approval

The study protocol was approved by the National Research Centre, Cairo, Egypt Ethics Committee (16/109). The study was conducted in accordance with the principles of the Declaration of Helsinki.

Author Contributions

Conception and design, laboratory analysis: E.E.; Laboratory analysis, drafting manuscript: B.M.; Collecting, drafting manuscript: D.D.; Supervision, revising, the article approving the final version: N.K.

Conflict of Interest

The authors declared no conflicts of interest with respect to the authorship and/or publication of this article.

Financial Disclosure

This study was funded by the National Research Centre, Cairo, Egypt.