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- W2061081286 abstract "The present investigation demonstrates distinct patterns of activation for antioxidant/electrophile-responsive elements (ARE/EpREs) in cells of neuronal versus hepatic origin suggesting the possibility of cell-/tissue-specific signaling pathways and/or transcription factors required for ARE/EpRE activation. The ARE/EpRE is a cis-acting regulatory element found in 5'-flanking regions of numerous genes including NAD(P)H:quinone oxidoreductase (QR) and glutathione S-transferases. Insomuch as ARE/EpRE activation has been studied primarily in hepatoma cell lines there is little information on how these responsive elements and corresponding genes are regulated in brain. ARE/EpRE-reporter constructs were transiently transfected into IMR-32 human neuroblastoma cells. Activation of ARE/EpRE sequences by tert-butylhydroquinone (tBHQ), a redox-cycling compound, in IMR-32 cells (20- to 30-fold) is dramatically different from the minimal response seen in HepG2 human hepatoma cells (2- to 3-fold). beta-napthoflavone, an ARE/EpRE inducer in HepG2 cells, as well as the oxidants hydrogen peroxide and tert-butyl hydroperoxide did not induce the ARE/EpRE in IMR-32 cells. In addition, we show that the core sequence containing a complete 5' palindrome is necessary for maximal activation of the ARE/EpRE in IMR-32 cells. Mutations within this palindromic sequence decrease basal level expression and block induction by tBHQ but not phorbol 12-myristate 13-acetate. Furthermore, activation of the hQR-ARE/EpRE by tBHQ correlates with induction of endogenous QR activity in IMR-32 neuroblastoma cells (15-fold). Thus, elucidating the mechanism of ARE/EpRE activation in this human neuroblastoma cell line may identify unknown transcription factors or signal transduction cascades regulating ARE/EpRE-driven gene expression." @default.
- W2061081286 created "2016-06-24" @default.
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- W2061081286 date "1999-03-01" @default.
- W2061081286 modified "2023-10-08" @default.
- W2061081286 title "Activation of Antioxidant/Electrophile-Responsive Elements in IMR-32 Human Neuroblastoma Cells" @default.
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- W2061081286 doi "https://doi.org/10.1006/abbi.1998.1046" @default.
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