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- W2034383694 abstract "Phosphatidylinositol 3-kinase (PI-3 kinase) has been implicated in the regulation of many cellular processes, including growth and transformation. We describe the effect of glucocorticoids on cell growth, phosphoinositide formation and PI-3 kinase activity in Rous sarcoma virus-transformed hamster fibroblasts (HET-SR). Using a prolonged dexamethasone treatment of HET-SR cells we have selected a new glucocorticoid receptor-positive cell subline, HET-SR(h), that was resistant to growth inhibitory action of dexamethasone and/or non-hormonal drugs (vinblastine, adriamycin) and was characterized by higher levels of phosphoinositide formation and increased PI-3 kinase activity. Study of the short-term hormone action has shown that both dexamethasone-sensitive and -resistant sublines responded to hormone by a decrease in phospholipid turnover rate. At the same time, in both cell lines activation of PI-3 kinase after dexamethasone addition was revealed. Dexamethasone-dependent activation of PI-3 kinase was more significant and maintained for a longer period in HET-SR(h) cells than in parent HET-SR cells. Finally, by transfecting p110*, a constitutively active catalytic subunit of PI-3 kinase, into hormone-sensitive HET-SR cells, we have found a marked increase in cell resistance to growth inhibitory dexamethasone action. These results suggest that PI-3 kinase may serve as one of the factors providing cell resistance to cytostatic drugs." @default.
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- W2034383694 date "1999-07-01" @default.
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- W2034383694 title "The role of phosphatidylinositol 3-kinase in the regulation of cell response to steroid hormones" @default.
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- W2034383694 doi "https://doi.org/10.1016/s0167-4889(99)00066-x" @default.
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