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- W164060757 abstract "Placental growth factor (PlGF) is a pro-angiogenic and inflammatory mediator that promotes many pathological conditions including, diabetes, atherosclerosis and cancer. In mouse models, the loss of PlGF or inhibition of vascular endothelial growth factor receptor-1 (VEGFR-1) activity suppresses these disorders. Hyperglycaemia plays a fundamental role in the pathogenesis of type-2 diabetes and associated conditions, resulting in a loss of PI3 kinase (PI3K) signalling and dysfunction in endothelial cells. Using pharmacological inhibitors, siRNA, and adenoviral constructs to modulate the PI3K/Akt signalling activity, I found that the induction of PlGF expression in human umbilical vein endothelial cells (HUVEC) by hyperglycaemia is PI3K/Akt-dependent. Using similar approaches, the FOXO1 transcription factor was identified as the downstream target of Akt involved in the regulation of both PlGF and VEGFR-1 expression. FOXO1 was found to interact directly with the VEGFR-1 gene promoter in vitro, and over-expression of constitutively-active FOXO1 promotes PlGF expression in vivo. Although VEGF activates PI3K/Akt, it stimulates robust PlGF release in endothelial cells. Here I show that this effect is both VEGFR-2 and PKC-dependent, but independent of PI3K/Akt. The PI3K/Akt/FOXO1 axis is an important regulator of vascular homeostasis and stress responses and the identification of its involvement in PlGF expression may provide new therapeutic targets for disorders characterised by endothelial dysfunction." @default.
- W164060757 created "2016-06-24" @default.
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- W164060757 date "2011-07-01" @default.
- W164060757 modified "2023-09-26" @default.
- W164060757 title "Molecular regulation of Placental Growth Factor (PlGF) expression in endothelial cells" @default.
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