title: Natural inhibitors of blood coagulation and fibrinolysis in patients with lupus anticoagulant.
abstract: We studied the natural inhibitors (NI) of blood coagulation and fibrinolysis in 50 patients with lupus anticoagulant (LA), in order to identify possible alterations of these NI, that could favour thrombotic manifestations. We found no statistically significant difference in antithrombin III, protein C and alpha 2-antiplasmin between controls and patients with LA, irrespective of their clinical manifestations. We found an increase of plasminogen activator inhibitor (PAI, P < 0.001) and a decrease of free protein S (PSf, P < 0.001) and total protein S (PSt, 0.01 < P < 0.05) in the patients with LA when compared with the control group. We found no difference in the levels of NI between patients with thrombosis (n = 19) and without thrombosis (n = 31) nor between patients with (n = 25) or without thrombosis and/or foetal loss (n = 25). In contrast, we observed a decrease of PSf in women with foetal loss (n = 10) as compared with women without foetal loss (n = 22, 0.01 < P < 0.05) and a decrease of PSf when comparing 19 patients with systemic lupus erythematosus (SLE) with 31 patients without SLE (0.01 < P < 0.05). These findings show that the patients with LA had several abnormalities in the NI system, but there was no significant association between levels of PAI, PSf, PSt and a history of thrombosis.
authors: Department of Biological Chemistry, School of Exact and Natural Sciences, University of Buenos Aires, Argentina.
authors: L C
authors: LC
authors: Kordich
authors: R R
authors: RR
authors: Forastiero
authors: E
authors: E
authors: Basilotta
authors: P
authors: P
authors: Porterie
authors: L O
authors: LO
authors: Carreras
mesh_terms: D000026:Abortion, Habitual / Q000097:blood*; D000293:Adolescent; D000328:Adult; D000990:Antithrombin III / Q000032:analysis; D001327:Autoimmune Diseases / Q000097:blood*; D001777:Blood Coagulation; D002648:Child; D005260:Female; D005342:Fibrinolysis; D006402:Hematologic Diseases / Q000097:blood; D006801:Humans; D007239:Infections / Q000097:blood; D016682:Lupus Coagulation Inhibitor / Q000097:blood*; D008180:Lupus Erythematosus, Systemic / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000097:blood; D017395:Plasminogen Activator Inhibitor 1 / Q000032:analysis; D011247:Pregnancy; D011486:Protein C / Q000032:analysis; D017293:Protein S / Q000032:analysis; D013927:Thrombosis / Q000097:blood*; D000979:alpha-2-Antiplasmin / Q000032:analysis
chemical_list: D016682:Lupus Coagulation Inhibitor; D017395:Plasminogen Activator Inhibitor 1; D011486:Protein C; D017293:Protein S; D000979:alpha-2-Antiplasmin; D000990:Antithrombin III