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Molecular Regulation of Human Placental Growth Factor (PlGF) Gene Expression in Placental Villi and Trophoblast Cells is Mediated via the Protein Kinase A Pathway

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Depoix, C. Tee, M. K. Taylor, R. N.

Cyclic 3',5'-adenosine monophosphate (cAMP) is a critical second messenger for human trophoblasts and regulates the expression of numerous genes. It is known to stimulate in vitro the fusion and differentiation of BeWo choriocarcinoma cells, which acquire characteristics of syncytiotrophoblasts. A DNA microarray analysis of BeWo cells undergoing forskolin-induced syncytialization revealed that among the induced genes, placental growth factor (PlGF) was 10-fold upregulated. We verified this result in two choriocarcinoma cell lines, BeWo and JEG-3, and also in first trimester placental villous explants by quantifying PlGF mRNA (real time PCR) and PlGF protein secreted into the supernatant (ELISA). Similar effects were noted for vascular endothelial growth factor (VEGF) mRNA and protein expression. Treatment with cholera toxin and the use of a specific inhibitor of protein kinase A (PKA) blocked these effects, indicating that the cAMP/PKA pathway is responsible for the cAMP-induced upregulation of PlGF and that one or more G protein coupled receptor(s) was involved. We identified two functional cAMP responsive elements (CRE) in the PlGF promoter and demonstrated that the CRE binding protein, CREB, contributes to the regulation of PlGF gene expression. We speculate that defects in this signaling pathway may lead to abnormal secretion of PlGF protein as observed in the pregnancy-related diseases preeclampsia and intrauterine growth restriction.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2010
Language Anglais
Journal information "Reproductive Sciences" - Vol. 18, no.3, p. 219-228 (2010)
Peer reviewed yes
Publisher Sage Publications, Inc. (Thousand Oaks)
issn 1933-7191
e-issn 1933-7205
Publication status Publié
Affiliation UCL - SSS/IREC - Institut de recherche expérimentale et clinique
Links
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Bibliographic reference Depoix, C. ; Tee, M. K. ; Taylor, R. N.. Molecular Regulation of Human Placental Growth Factor (PlGF) Gene Expression in Placental Villi and Trophoblast Cells is Mediated via the Protein Kinase A Pathway. In: Reproductive Sciences, Vol. 18, no.3, p. 219-228 (2010)
Permanent URL http://hdl.handle.net/2078.1/150825