Prothrombotic Effect of Anti-beta-2 Glycoprotein-1 Antibodies on the Expression of Tissue Factor, Thrombomodulin, and Plasminogen Activator Inhibitor-1 in Endothelial Cells

Rikarni, Rahayuningsih Dharma, Karmel Lindow Tambunan, Harry Isbagyo, Betty E. Dewi, Nuzirwan Acang, Rianto Setiabudy, Adi K. Aman

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AIM: to analyse the effects of immunoglobulin(Ig)G and IgM anti-beta-2 glycoprotein-1 (anti-2GP1) on the expression of tissue factor (TF), thrombomodulin (TM), and plasminogen activator inhibitor-1(PAI-1) of endothelial cells in the messenger RNA level.

METHODS: laboratory experimental study in human umbilical vein endothelial cells (HUVEC) was done at Cipto Mangunkusumo Hospital/Faculty of Medicine, Universitas Indonesia. Samples are purified IgG anti-2GP1 from six antiphospholipid syndrome (APS) patients serum and IgM anti-2GP1 from six APS patients serum. For controls, purified IgG from six normal human serum (IgM-NHS) and purified IgM from six normal human serum (IgM-NHS) were used. HUVEC were treated with purified IgG anti-2GP1, IgM anti-2GP1, IgG-NHS, IgM-NHS for four hours of incubation. We measured TF, TM, and PAI-1 of HUVEC in mRNA relative expression levels (before and after treatment) by real time reverse transcription polymerase chain reaction.

RESULTS: the mean value of TF, TM, and PAI-1 mRNA levels in HUVEC after treated with IgG anti-2GP1 compared to Ig-NHS were 3.14 (0.93)-, 0.31 (0.13)-, 5.33 (2.75)-fold respectively. In other hand, after treated with IgM anti-2GP1 compared to IgM-NHS, mRNA levels of TF, TM, and PAI-1 were 4.33 (1.98)-, 0.33 (0.22)-, 5.47 (2.64)-fold respectively. Before and after treatment with IgG anti-2GP1 showed significant differences of TF mRNA levels {1.09 (0.76) versus 3.14 (0.93), p=0.003}, TM mRNA levels {0.91 (0.11) versus 0.31(0.13), p=0.001}, and PAI-1 mRNA levels 0.93 (0.13) versus 5.33 (2.75), p=0.013}. Before and after treatment with IgM anti-2GP1 showed significant differences of TF mRNA levels {1.03 (0.11) versus 4.33 (1.98), p=0.008}, TM mRNA levels {0.93 (0.08) versus 0.33 (0.22, p=0.003}, and PAI-1 mRNA levels {1.02 (0.10) versus 5.47 (2.64), p=0.01}.

CONCLUSION: IgG anti-2GP1 and IgM anti-2GP1 increased TF and PAI-1 mRNA levels. However, IgG anti-2GP1 and IgM anti-2GP1 decreased TM mRNA levels. It proved that the mechanism of thrombosis in APS occurs through coagulation activation, reduction of fibrinolysis activity, and reduction of anticoagulant activity.

Original languageEnglish
Pages (from-to)31-37
Number of pages7
JournalActa medica Indonesiana
Issue number1
Publication statusPublished - 1 Jan 2015


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