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Expression of the blood-group-related antigens Sialyl Lewis a, Sialyl Lewis x and Lewis y in term placentas of normal, preeclampsia, IUGR- and HELLP-complicated pregnancies

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Abstract

Lewis antigens belong to the blood group of antigens and mediate cellular adhesion through interaction with selectins. Invasive trophoblasts use an array of adhesion molecules to facilitate cell–cell and cell–extracellular matrix interactions. Here, we examined immunohistochemically the expression of Sialyl Lewis a (sLea), Sialyl Lewis x (sLex) and Lewis y (Ley) in term placentas obtained from cases of normal, intrauterine growth retardation (IUGR), preeclamptic (PE) and hemolysis, elevated liver enzymes and low platelets syndrome (HELLP) pregnancies. We report the expression of sLex in third trimester extravillous trophoblasts (EVT). sLex was significantly decreased in IUGR and moderately decreased in PE compared to normal placentas. sLex was additionally found in syncytiotrophoblast, without however any significant differences in staining intensity between normal and pathological cases. sLea was restricted to amnion epithelium. Finally, Ley was expressed in cytotrophoblasts and villous endothelial cells. Ley expression was significantly upregulated in IUGR and HELLP, whereas there was a trend toward increase in PE compared to normal placentas. The present study suggests that downregulation of sLex in EVT might be associated with IUGR and PE. Furthermore, Ley, which was recently described as a potent angiogenic factor, is upregulated in placental villi in conditions associated with placental malperfusion.

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Acknowledgments

This work was supported by a project and grant from the German (DAAD) & Greek State Scholarships Foundation (IKYDA 2003)

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Correspondence to Ioannis Mylonas.

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U. Jeschke and A. Makrigiannakis have contributed equally.

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Minas, V., Mylonas, I., Schiessl, B. et al. Expression of the blood-group-related antigens Sialyl Lewis a, Sialyl Lewis x and Lewis y in term placentas of normal, preeclampsia, IUGR- and HELLP-complicated pregnancies. Histochem Cell Biol 128, 55–63 (2007). https://doi.org/10.1007/s00418-007-0293-7

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