Abstract
Fibroblast growth factor-2 (FGF-2) is a potent mitogen expressed widely during embryogenesis and in tissues of the human fetus. It is recognized as an endothelial cell mitogen and is angiogenic in vivo. Expression of FGF-2 mRNA has also been shown within the human term placenta, and FGF-2 isolated from placental tissue, suggesting a role in placental growth including angiogenesis. The purpose of this study was to quantify and localize the sites of expression of FGF-2 and its high-affinity receptor, FGFR1, within placentae from normal term human pregnancies (n=8, 39-42 weeks), and pregnancies complicated by pregestational, type 1 diabetes (n=8, 36-40 weeks). Tissues were collected immediately following delivery and were either snap-frozen for RNA isolation, or fixed for either in situ hybridization using a 35S-labelled cRNAs encoding human FGF-2 or FGFR1, or immunocytochemistry using antibodies against human FGF-2 or FGFR1. Northern blot hybridization showed a significantly increased abundance of mRNAs for both FGF-2 and FGFR1 in placentae from diabetic women compared to those from normal women. In normal term placenta FGF-2 mRNA was present at low abundance in fetal villous tissue, in the vascular endothelium of blood vessels, ...Continue Reading
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