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Annexin A2 mediates anti-β2GPI/β2GPI-induced tissue factor expression on monocytes

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Growing evidence suggests that autoantibodies directly contribute to hypercoagulability in the antiphospholipid syndrome (APS). One proposed mechanism is the antibody-induced expression of tissue factor (TF) by blood monocytes. Annexin A2 (ANX2), a mediator of cell surface-specific plasmin generation, was identified to mediate endothelial cell activation by anti-β2-glycoprotein I (anti-β2GPI) antibody. Our previous study suggested that ANX2 was also involved in anti-β2GPI/β2GPI-induced TF expression on monocytes. In the current study, it was further demonstrated that β2GPI interacts with ANX2 not only in a cell-dependent form but also in a cell-free system. To further confirm the effects of ANX2 on anti-β2GPI/β2GPI-induced TF expression, an ANX2 cDNA-containing vector was transfected into HEK 293T cells which had originally little ANX2, then cells were treated by anti-β2GPI/β2GPI complex. It was found that transfected HEK 293T cells could express more TF both at mRNA and protein levels than that of no-transfected cells. On the other hand, the TF expression was dramatically decreased in the THP-1 cells in which the ANX2 RNA interference was performed. In conclusion, these results indicate that ANX2 on cell surface functions as a mediator boosting TF expression on monocytes induced by anti-β2GPI/β2GPI complex, which is contributed to the thrombotic events in APS.
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Document Type: Research Article

Affiliations: Department of Clinical Laboratory and Hematology, Jiangsu University, Jiangsu 212013, P.R. China., Email: [email protected]

Publication date: January 1, 2009

More about this publication?
  • The International Journal of Molecular Medicine is a monthly, peer-reviewed journal devoted to the publication of high quality studies related to the molecular mechanisms of human disease. The journal welcomes research on all aspects of molecular and clinical research, ranging from biochemistry to immunology, pathology, genetics, human genomics, microbiology, molecular pathogenesis, molecular cardiology, molecular surgery and molecular psychology.

    The International Journal of Molecular Medicine aims to provide an insight for researchers within the community in regard to developing molecular tools and identifying molecular targets for the diagnosis and treatment of a diverse number of human diseases.
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