Current rheumatology reports
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This article reviews current understanding of the relationship between antiphospholipid antibodies and the endothelium. In vitro antiphospholipid antibodies produce endothelial cell activation. Clinical data in this area are scanty and worthy of future research, which could lead to new therapies in the management of antiphospholipid syndrome.
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The antiphospholipid antibody syndrome is an autoimmune condition in which venous or arterial thrombosis and recurrent pregnancy losses occur in patients having serologic evidence of antibodies against anionic phospholipid-protein complexes. The pathophysiologic mechanisms of this syndrome have not yet been established. ⋯ We propose that thrombosis and pregnancy loss in the antiphospholipid syndrome may be caused by disruption of this Annexin-V shield by antiphospholipid (and cofactor) antibodies, thereby increasing the net quantity of thrombogenic phospholipids exposed to the circulating blood. The data accumulated from tissue immunohistochemistry, trophoblast and endothelial cell culture studies, coagulation studies using noncellular phospholipids, and competition studies on artificial phospholipid bilayer are consistent with the hypothesis that interference with the binding of Annexin-V to anionic phospholipid surfaces is an important mechanism of thrombosis and pregnancy loss in the antiphospholipid syndrome.