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Original Articles: Hormones and Reproductive Health |
5ß1 Integrin via Mitogen-Activated Protein Kinase Pathway1
Departments of Anatomy and Cell Biology (L.M.G., T.M., P.K.L.) and Pathology (C.C.), The University of Western Ontario, London, Ontario, Canada N6C 5C1
Address all correspondence and requests for reprints to: Peeyush K. Lala, M.D., Department of Anatomy and Cell Biology, Medical Science Building, The University of Western Ontario, London, Ontario, Canada N6A 5C1. E-mail: pklala{at}julian.uwo.ca
Abstract
A highly migratory subpopulation of the human placental trophoblast,
known as the extravillous trophoblast (EVT), invades the uterus and its
vasculature, to establish adequate exchange of key molecules between
the maternal and fetal circulations. During their formation, EVT cells
selectively acquire
5ß1 integrin. We had shown that
5ß1 is
required for their migratory function, and that EVT cell migration is
stimulated by insulin-like growth factor-binding protein (IGFBP)-1
produced by the uterine decidua. The present study examined whether
this stimulation is dependent on binding of the Arg-Gly-Asp (RGD)
domain of IGFBP-1 to an RGD binding site on the
5ß1 integrin,
followed by activation of focal adhesion kinase (FAK) and stimulation
of the mitogen-activated protein kinase (MAPK) pathway. IGFBP-1
treatment increased migration of EVT cells, whereas an anti-
5ß1
integrin antibody blocked migration regardless of IGFBP-1 treatment.
Migration stimulation by IGFBP-1 was abrogated by pretreatment with a
Gly-Arg-Gly-Asp-Ser-Pro (GRGDSP), but not a
Gly-Arg-Gly-Glu-Ser-Pro (GRGESP) hexapeptide, and by mutation of the
RGD domain of IGFBP-1 to Trp-Gly-Asp (WGD). IGFBP-1 treatment caused a
rapid localization of immunoreactive FAK to cellular lamellipodia, a
rapid increase in phosphorylation of FAK and extracellular-signal
regulated kinases 1 and 2. Preincubation of EVT cells with Herbimycin
A, a tyrosine kinase inhibitor, abrogated IGFBP-1 effects; whereas an
MAPK kinase inhibitor, PD 98059, reduced migration regardless of
IGFBP-1 treatment. These results indicate that IGFBP-1 stimulation of
EVT cell migration occurs by binding of its RGD domain to the
5ß1
integrin, leading to activation of FAK and stimulation of MAPK pathway.
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