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- W2016196104 abstract "Insulin-like-growth factor binding protein 2 (IGFBP-2) is thought to be a marker for the phosphatase and tensin homolog (PTEN) status and activity of the phosphatidylinositol 3-kinase (PI3K)/AKT/mammalian target of rapamycin (mTOR) pathway. We aimed to evaluate whether or not lipoma cells of a patient with a heterozygous deletion in the PTEN gene would produce more IGFBP-2 than PTEN non deficient control cells. Moreover, we analysed the influence of pharmacological inhibitors of the PI3K/AKT/mTOR pathway on IGFBP-2 production. PTEN deficient preadipocytes and control PTEN non deficient preadipocytes were differentiated in vitro and treated with the respective inhibitors. PTEN was transiently down regulated by siRNA in human preadipocytes. IGFBP-2 mRNA and protein expression and IGFBP-2 in culture supernatant were measured. PTEN deficient lipoma cells were found to produce IGFBP-2 during in vitro differentiation in comparable amounts to PTEN non deficient cells. In contrast, acute down regulation of PTEN in preadipocytes resulted in enhanced production of IGFBP-2. Incubation with the PI3K inhibitors LY294002 and wortmannin decreased IGFBP-2 mRNA and protein. Neither the mTOR complex 1 inhibitor rapamycin nor PD98059, an inhibitor of MEK (mitogen-activated protein kinase kinase), showed a significant effect on IGFBP-2 production. IGFBP-2 production in PTEN deficient preadipocytes was not influenced by PTEN deficiency or by inhibition of mTORC1 and MAPK. In contrast, inhibition of PI3K decreased IGFBP-2 expression and secretion." @default.
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- W2016196104 date "2015-06-01" @default.
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- W2016196104 title "Phosphatidylinositol 3-kinase (PI3K) signalling regulates insulin-like-growth factor binding protein-2 (IGFBP-2) production in human adipocytes" @default.
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- W2016196104 doi "https://doi.org/10.1016/j.ghir.2015.03.003" @default.
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