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Complement deposition, C4d, on platelets is associated with vascular events in systemic lupus erythematosus.

ABSTRACT: OBJECTIVE:Complement components, including C4d, can be found on activated platelets, a process associated with vascular disease in SLE. We investigated whether platelet C4d (PC4d) adds additional value to traditional and known lupus-associated risk factors when identifying SLE patients with vascular disease. METHODS:This cross-sectional study included 308 well-characterized SLE patients and 308 matched general population controls. PC4d deposition was analysed using flow cytometry. Values >95% of controls were considered as PC4d positive (+). aPL were determined by Luminex, and the LA test was performed by DRVVT. History of vascular disease (composite and as separate outcomes) was defined at inclusion. RESULTS:SLE patients had increased PC4d deposition as compared with population controls (50 vs 5%, P?

SUBMITTER: Svenungsson E

PROVIDER: S-EPMC7590416 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature

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Complement deposition, C4d, on platelets is associated with vascular events in systemic lupus erythematosus.

Svenungsson Elisabet E Gustafsson Johanna T JT Grosso Giorgia G Rossides Marios M Gunnarsson Iva I Jensen-Urstad Kerstin K Larsson Anders A Ekdahl Kristina N KN Nilsson Bo B Bengtsson Anders A AA Lood Christian C

Rheumatology (Oxford, England) 20201101 11

<h4>Objective</h4>Complement components, including C4d, can be found on activated platelets, a process associated with vascular disease in SLE. We investigated whether platelet C4d (PC4d) adds additional value to traditional and known lupus-associated risk factors when identifying SLE patients with vascular disease.<h4>Methods</h4>This cross-sectional study included 308 well-characterized SLE patients and 308 matched general population controls. PC4d deposition was analysed using flow cytometry. ...[more]

PMID: 32259250

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Project description:Anti-phospholipid (aPL) antibodies are important contributors to development of thrombosis in patients with the autoimmune rheumatic disease systemic lupus erythematosus (SLE). The underlying mechanism of aPL antibody-mediated thrombosis is not fully understood but existing data suggest that platelets and the complement system are key components. Complement activation on platelets is seen in SLE patients, especially in patients with aPL antibodies, and has been related to venous thrombosis and stroke. The aim of this study was to investigate if aPL antibodies could support classical pathway activation on platelets in vitro as well as in SLE patients. Furthermore, we investigated if complement deposition on platelets was associated with vascular events, either arterial or venous, when the data had been adjusted for traditional cardiovascular risk factors. Finally, we analyzed if platelet complement deposition, both C1q and C4d, was specific for SLE. We found that aPL antibodies supported C4d deposition on platelets in vitro as well as in SLE patients (p?=?0.001 and p<0.05, respectively). Complement deposition on platelets was increased in SLE patients when compared with healthy individuals (p<0.0001). However, high levels of C4d deposition and a pronounced C1q deposition were also seen in patients with rheumatoid arthritis and systemic sclerosis. In SLE, C4d deposition on platelets was associated with platelet activation, complement consumption, disease activity and venous (OR?=?5.3, p?=?0.02), but not arterial, thrombosis, observations which were independent of traditional cardiovascular risk factors. In conclusion, several mechanisms operate in SLE to amplify platelet complement deposition, of which aPL antibodies and platelet activation were identified as important contributors in this investigation. Complement deposition on platelets was identified as a marker of venous, but not arterial thrombosis, in SLE patients independently of traditional risk factors and aPL antibodies. Further studies are needed to elucidate the role of complement deposition on platelets in development of venous thrombosis.

Dataset Information

Complement deposition, C4d, on platelets is associated with vascular events in systemic lupus erythematosus.

Publications

Complement deposition, C4d, on platelets is associated with vascular events in systemic lupus erythematosus.

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