Mol. Hum. Reprod. Advance Access originally published online on July 2, 2004
Molecular Human Reproduction 2004 10(9):677-684; doi:10.1093/molehr/gah088
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Both mitogen-activated protein kinase and phosphatidylinositol 3-kinase signalling are required in epidermal growth factor-induced human trophoblast migration
1Hormones, Growth and Development Program, Ottawa Health Research Institute, Ottawa, Ontario, Divisions of 2Maternal-Fetal Medicine and 3Reproductive Medicine, Department of Obstetrics and Gynecology, University of Ottawa, The Ottawa Hospital, Ottawa, Ontario, Canada
4 To whom correspondence should be addressed at: Division of Maternal–Fetal Medicine, Department of Obstetrics and Gynecology, The Ottawa Hospital, Ottawa, Room 8420, 501 Smyth Road, Ottawa, Ontario, Canada K1H 8L6. Email: agruslin{at}ottawahospital.on.ca
Adequate extravillous trophoblast (EVT) invasion is an essential step for placental formation. The aim of this study was to examine the possible role of phosphatidylinositol 3-kinase (PI3K) and mitogen-activated protein kinase (MAPK) signalling in epidermal growth factor (EGF)-induced EVT migration and to determine if the 70 kDa ribosomal S6 kinase (p70S6K) is involved in this process. In this study, EGF significantly stimulated HTR8/SVneo cell migration and the phosphorylation of AKT, ERK1/2 and p70S6K in a concentration-dependent manner. The MAPK inhibitor U0126 decreased cell migration and ERK phosphorylation, but it did not influence p70S6K phosphorylation in response to EGF. In the presence of PI3K inhibitors (Wortmannin), EGF-stimulated trophoblast migration and phosphorylation of AKT and P70S6K (Thr389 and Thr421/Ser424) were decreased, while EGF-induced ERK phosphorylation was not affected. Expression of an activated AKT (Myr-AKT2) increased basal phospho-p70S6K (Thr389 and Thr421/Ser424) content, but failed to stimulate cell migration. However, it induced cell migration in the presence of EGF and Wortmannin, in which both AKT and MAPK pathways were activated. In addition, there was a concentration-dependent inhibition of cell migration and p70S6K phosphorylation (Thr389 and Thr421/Ser424) in the presence of Rapamycin, a specific inhibitor of the mammalian target of rapamycin (mTOR, a downstream of AKT). Taken together, our data suggest that EGF-induced trophoblast migration involves the coordinated regulation of both PI3K/AKT and MAPK signalling pathways. mTOR/p70S6K is important in PI3K- but not MAPK-mediated trophoblast migration in response to EGF.
Key words: MAPK/migration/p70S6K/PI3K/trophoblast
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