ArticleRheumatology international2014
Could the complement component C4 or its fragment C4d be a marker of the more severe conditions in patients with primary Sjögren's syndrome?
Article in Rheumatology international, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed, 7 citations in OpenAlex.
- Clinical characteristics and prognosis of primary Sjögren's disease patients with hypocomplementemia: reduced C3 is independently associated with new-onset peripheral cytopenias.Clinical rheumatology · 2026Article
- Chest muscle area, spleen density, CD4 + T%, and C4 to predict the development of interstitial lung disease in patients with Sjögren's syndrome: a clinical prediction model.Clinical rheumatology · 2026Article
- Hypocomplementemia in primary Sjogren's syndrome: association with serological, clinical features, and outcome.Clinical rheumatology · 2022Article
- Meta-Analysis of Autoimmune Regulator-Regulated Genes in Human and Murine Models: A Novel Human Model Provides Insights on the Role of Autoimmune Regulator in Regulating STAT1 and STAT1-Regulated Genes.Frontiers in immunology · 2018Article
- Distribution of Peripheral Lymphocyte Populations in Primary Sjögren's Syndrome Patients.Journal of immunology research · 2015Article
Corrections and comments
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Authors and funding
7 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Our aim is to evaluate the complement component C4 (C4) and its fragment C4d (C4d) levels, focusing on their associations with other markers of B cells' activity in patients with primary Sjögren's syndrome (pSS). Humoral factors C4, C4d, B cell-activating factor (BAFF), κ and λ free light chains (FLCs) and IgG (by immunoassay) were investigated in 58 patients with pSS and in 28 healthy controls. We observed significantly higher levels of BAFF, κ and λ FLC and IgG, and significantly lower level of C4 in pSS patients, while the level of C4d was similar in the both groups. Significantly higher levels of BAFF, κ and λ FLCs, IgG, and significantly lower C4 level were found in anti-SSA/SSB antibodies (Abs) seropositive pSS patients' group comparing with healthy controls. Level of C4d was significantly lower in anti-SSA/SSB Abs seropositive pSS patients comparing with seronegative pSS patients and healthy controls. C4d correlated with C4, anti-SSB Abs level and κ/λ ratio. Significantly higher κ FLC and IgG levels were found in anti-SSA/SSB Abs seronegative pSS patients comparing with healthy controls. Anti-SSA/SSB seropositivity in pSS patients is associated with the decreased level of C4d. These results show that C4d can be an appropriate marker of antibody response and complement activation in pSS patients with Abs, and possibly may show the more severe condition-exhaustion of C4. Further studies are required to determine whether C4d assessment could be a relevant biomarker for the more severe condition and the worse prognosis of pSS.
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