Abstract
Pre-eclampsia is often associated with inadequate cytotrophoblast invasion and remodelling of the uterine spiral arteries. Examining a first trimester, 2D in vitro explant culture model which mimics in vivo placentation, including trophoblast column formation and extravillous cytotrophoblast (EVT) migration, we previously suggested that excessive maternal decidual natural killer cell interferon (IFN-gamma) limits EVT migration. Types-1 and -2 insulin-like growth factor (IGF-1, IGF-2) are trophic for EVT, act through their surface receptors, IGFR-1 and IGFR-2, and are regulated by the IGF-binding proteins (IGFBPs). Could the observed IFN-gamma-mediated inhibition of EVT outgrowth and migration be related to either expression changes of IGF-1 or IGF-2, their receptors, their binding proteins, or apoptosis? Using the 2D explant culture model, we examined the effect of IFN-gamma exposure on IGF-1 and -2, IGFR-1 and -2, IGFBPs and apoptosis. IFN-gamma relatively increased IGF-1 and -2 secretion. In EVT, IFN-gamma decreased IGFR-2, but not IGFR-1 expression. IGBP-2, -3 and -4 production were not influenced by IFN-gamma. IFN-gamma induced trophoblast apoptosis measured by the highly sensitive M30 neo-epitope, but not caspase 3 activit...Continue Reading
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