Anti-endothelial cell antibody binding makes negatively charged phospholipids accessible to antiphospholipid antibodies

Anne Bordron, Maryvonne Dueymes, Yair Levy, Christophe Jamin, Lea Ziporen, Jean Charles Piette, Yehuda Shoenfeld, Pierre Youinou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


Objective. Anti-endothelial cell autoantibodies (AECA) are often associated with antibodies to anionic phospholipids (PL), such as phosphatidylserine (PS). Yet, β2-glycoprotein I (β2GPI)-dependent anti- PL antibodies (aPL) do not have access to their target antigens on the membrane of endothelial cells (EC). Given that AECA are capable of exposing PS and, thereby, initiating apoptosis, we explored the relationships between AECA, β2GPI, and aPL on the surface of EC. Methods. Human EC were incubated with mouse AECA monoclonal antibodies, and the translocation of PS was established through the binding of annexin V, which binds specifically to PS. A rabbit anti-β2GPI antibody and biotin-conjugated F(ab')2 aPL derived from 3 patients were also used to detect β2GPI on the cells. Results. Twenty percent to 36% of the cells expressed anionic PL following incubation with AECA, as revealed by the binding of annexin V and β2GPI. The proportion of anionic PL-expressing EC (up to 90%) correlated with the period of incubation of EC with AECA and depended on the dose of AECA. Bound aPL resided exclusively within the AECA-positive EC population. Conclusion. Based on our findings, AECA may be pathogenic. Some of them may even have the potential to induce production of aPL.

Original languageEnglish
Pages (from-to)1738-1747
Number of pages10
JournalArthritis and Rheumatism
Issue number10
StatePublished - Oct 1998
Externally publishedYes


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