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ORIGINAL ARTICLE: Antiphospholipid Antibodies Limit Trophoblast Migration by Reducing IL‐6 Production and STAT3 Activity -
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- Publisher
- Wiley
- Copyright
- © 2010 John Wiley & Sons A/S
- ISSN
- 1046-7408
- eISSN
- 1600-0897
- DOI
- 10.1111/j.1600-0897.2009.00805.x
- pmid
- 20132164
- Publisher site
- See Article on Publisher Site
Abstract
Citation Mulla MJ, Myrtolli K, Brosens JJ, Chamley LW, Kwak‐Kim JY, Paidas MJ, Abrahams VM. Antiphospholipid antibodies limit trophoblast migration by reducing IL‐6 production and STAT3 activity. Am J Reprod Immunol 2010 Problem Women with antiphospholipid antibodies (aPL) are at risk of recurrent miscarriage and pre‐eclampsia. aPL target the placenta by binding to β2‐glycoprotein I (β2 GPI) expressed by the trophoblast. The objective of this study was to evaluate if and how aPL affect first trimester trophoblast migration. Method of study First trimester trophoblast cells were treated with anti‐β2 GPI monoclonal antibodies. Migration was determined using a two‐chamber assay. Interleukin (IL)‐6 production was evaluated by RT‐PCR and enzyme‐linked immunosorbent assay, and signal transducer and activator of transcription 3 (STAT3) activation was assessed by western blot. Results Trophoblast cells constitutively secreted IL‐6 in a time‐dependent manner and this directly correlated with STAT3 phosphorylation. In the presence of anti‐β2 GPI Abs, trophoblast IL‐6 mRNA levels and secretion was downregulated in a Toll‐like receptor 4/MyD88‐independent manner and this correlated with a reduction in phosphorylated STAT3 levels. In addition, the anti‐β2 GPI Abs reduced the migratory potential of trophoblast. Heparin was able to reverse aPL‐dependent inhibition of trophoblast IL‐6 secretion and migration. Conclusion This study demonstrates that aPL limit trophoblast cell migration by downregulating trophoblast IL‐6 secretion and STAT3 activity. As heparin was unable to prevent these effects, our findings may explain why women with antiphospholipid syndrome, treated with heparin, remain at risk of developing obstetrical syndromes, associated with impaired deep placentation, such as pre‐eclampsia.
Journal
American Journal of Reproductive Immunology – Wiley
Published: May 1, 2010