Significance of Anti-oxidized LDL Antibody and Monocyte-derived Microparticles in Anti-phospholipid Antibody Syndrome

Abstract

Monocytes, platelets, endothelial cells and oxidized LDL could be very important in development of vascular complication in thrombotic diseases. We measured and compared the levels of plasma monocyte-derived microparticles (MDMPs), platelet-derived microparticles (PDMPs), and anti-oxidized LDL antibody, to develop a better understanding of their potential contribution to vascular complications in antiphospholipid antibody syndrome (APS). The concentration of MDMP in APS patients was significantly higher (p < 0.01) than that in normal subjects and SLE patients. When levels of PDMPs and plt-P-selectin were compared between the control and APS patients, levels of PDMPs and plt-P-selectin were significantly higher (p < 0.01 for each) in APS patients than in controls. In addition, these levels of platelet activation markers correlated with MDMP in APS patients. Twenty one of the 37 APS patients (56.8%) had elevated levels of anti-oxLDL antibody. In addition, a significant increase in MDMP was observed in anti-oxLDL antibody-positive APS patients (p < 0.01). These findings suggest that elevated MDMPs may be a sign of vascular complication in APS patients, particularly those who are detected anti-oxLDL antibodies.