To evaluate blood-borne endothelial microparticles (EMPs) in women with SLE and correlated these to disease activity as defined by the SLEDAI-2K score. The study takes cross-sectional design. A total of 90 age-matched women were recruited including: G1 (healthy volunteers, n = 30), G2 (women with SLE and low disease activity (SLEDAI-2K score ≤4; n = 30) and G3 (women with SLE and moderate/high disease activity (SLEDAI-2K score >4; n = 30). Blood was collected in 3.2% sodium citrate. Subsequently, the microparticles were purified by ultracentrifugation and labeled with anti-CD51/61 and anti-Annexin-V antibodies. Quantification and phenotyping were performed using flow cytometry. The number of EMPs was significantly higher in SLE patients compared with controls (P = 0.0178). When SLE patients were stratified according to disease activity, the number of EMPs was significantly increased in women with moderate-to-high disease activity compared with controls (P = 0.0074). We observed a correlation between the number of EMPs and age (r = −0.34; P = 0.0123) and between the number of EMPs and SLEDAI-2K score (r = 0.30; P = 0.04). Our results suggest that the SLE causes increased EMPs release, especially in patients with SLEDAI-2K score greater than 4. Although measurement of the EMPs could be useful in distinguishing patients with SLE from health controls, they have limited value in differentiating between SLE subtypes.
Blood Coagulation & Fibrinolysis – Wolters Kluwer Health
Published: Mar 1, 2018
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