Document Detail

Stimulation of syncytium formation in vitro in human trophoblast cells by galectin-1.
MedLine Citation:
PMID:  20656349     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Galectin-1 (gal-1), a member of the mammalian beta-galactoside-binding proteins, exerts biological effects by recognition of glycan ligands, including those involved in cell adhesion and growth regulation. In trophoblast cells, gal-1 binds to cell surface glycoproteins (e.g., Mucin1). It has been demonstrated that gal-1 recognizes appropriate glycotopes on the syncytiotrophoblast and extravillous trophoblast from second trimester human placenta and choriocarcinoma cells BeWo, which reveal two coexisting phenotypes, the cytotrophoblast-like and the syncytiotrophoblast-like phenotype. So the aim of this study was to investigate the effect of gal-1 on syncytium formation in BeWo and human villous trophoblasts (HVT) cells.
MATERIALS AND METHODS: The effect of gal-1 on syncytium formation was investigated with immunocytochemical and double immunofluorescence stainings, cell-labelling and Real-time RT-PCR. BeWo choriocarcinoma and HVT cells were incubated in vitro for 24 and 48 h in the absence (controls) and presence of gal-1 and forskolin and stained with antibodies against Ki67, beta-catenin, E-cadherin and syncytin. BeWo and HVT cells were incubated with 60 microg/ml gal-1 for 48 h (BeWo) or 96 h (HVT) and cell fusion was detected by fluorescent cell-labelling solution. Finally, BeWo cells were incubated for 1 h or 48 h in the absence and presence of 60 microg/ml gal-1 and Real-time RT-PCR was performed.
RESULTS: We showed with immunocytochemical staining a downregulation of beta-catenin expression in the 24 h BeWo cell culture and with double immunofluorescence staining an inhibition of the beta-catenin and E-cadherin expression in the 48 h BeWo cell culture stimulated with gal-1 or forskolin. The inhibition of E-cadherin was demonstrated on mRNA level in the 1 h BeWo cell culture too. Increased cell fusion was also showed with DiO and DiI fluorescent cell-labelling solution in the 48 h BeWo cell culture. In addition, we demonstrated the downregulation of Ki67 protein expression in the 24 h BeWo cell culture and on mRNA level in the 1 h BeWo cell culture. We also showed the upregulation of syncytin protein and mRNA expression after incubation of the 48 h BeWo cell culture with gal-1 or forskolin. Similar results were obtained with HVT cells: the amount of cell fusion was significantly increased in the gal-1 treated 48 h HVT cell culture in vitro compared to untreated cells as demonstrated with beta-catenin and E-cadherin double immunofluorescence staining. This increase was also shown by fluorescent cell-labelling with DiO and DiI in the 96 h HVT cell culture compared to untreated cells.
CONCLUSION: Our data suggest that gal-1 stimulates the syncytium formation in choriocarcinoma cells BeWo and HVT cells in vitro and inhibits the expression of beta-catenin, E-cadherin and in addition Ki67 in BeWo cells. Therefore gal-1 may be a major trigger for the process of trophoblast cell fusion.
I Fischer; S Redel; S Hofmann; C Kuhn; K Friese; H Walzel; U Jeschke
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-07-24
Journal Detail:
Title:  Placenta     Volume:  31     ISSN:  1532-3102     ISO Abbreviation:  Placenta     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-09-06     Completed Date:  2010-12-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8006349     Medline TA:  Placenta     Country:  England    
Other Details:
Languages:  eng     Pagination:  825-32     Citation Subset:  IM    
Copyright Information:
Copyright 2010. Published by Elsevier Ltd.
Ludwig Maximilians University of Munich, Department of Obstetrics and Gynecology, Maistrasse 11, 80337 Munich, Germany.
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MeSH Terms
Cadherins / antagonists & inhibitors
Cell Fusion
Cell Line, Tumor
Forskolin / pharmacology
Galectin 1 / pharmacology*,  physiology
Gene Products, env / biosynthesis
Giant Cells / drug effects*,  metabolism
Pregnancy Proteins / biosynthesis
Trophoblasts / cytology*
Reg. No./Substance:
0/Cadherins; 0/Galectin 1; 0/Gene Products, env; 0/Pregnancy Proteins; 0/syncytin; 66428-89-5/Forskolin

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