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- W2016324532 abstract "The glucocorticoid receptor (GR) is a ligand-dependent transcription factor capable of stimulating and inhibiting the expression of target genes. To better understand the biological action of glucocorticoids and the function of GR, we have utilized the tetracycline (Tc)-regulated mammalian expression system to develop a novel cell line, E8.2/GR3, derived from GR null mouse L929 fibroblasts, that exhibits conditional expression of rat GR. The intracellular concentration of rGR in E8.2/GR3 cells — from undetectable levels to levels more than 10-fold greater than that observed in wild-type L929 cells — could be manipulated by varying the Tc concentration in the culture media. Similarly, dexamethasone (DEX)-dependent transactivation of the mouse mammary tumor virus long terminal repeat and transrepression of the cadmium-induced activity of the mouse heme oxygenase-1 gene enhancer, SX2, were strictly dependent on the presence of rGR, and the levels of these activities could be modulated by Tc. Similar levels of Tc, and thus rGR, were required for half-maximal transactivation and transrepression whereas a 6-fold lower concentration of DEX was required for half-maximal transrepression than for transactivation. RU486 inhibited both DEX-dependent transactivation and transrepression. DEX decreased the steady-state level of rGR mRNA and protein in a Tc dependent manner. DEX also induced morphological changes in E8.2/GR3 cells that were dependent on rGR as no alterations were observed in the presence of Tc. These cells provide a powerful system for examining the various activities of GR, particularly as a function of different intracellular receptor concentrations." @default.
- W2016324532 created "2016-06-24" @default.
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- W2016324532 date "1998-02-01" @default.
- W2016324532 modified "2023-10-17" @default.
- W2016324532 title "Modulation of hormone-dependent glucocorticoid receptor function using a tetracycline-regulated expression system" @default.
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- W2016324532 doi "https://doi.org/10.1016/s0022-1759(97)89907-3" @default.
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