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• W2076096616 abstract "The mdr1b gene is thought to be a stress-responsive gene, however it is unknown if this gene is regulated by p53 in the whole animal. Moreover, it is unknown if overexpression of mdr1b affects cell survival. The dependence of mdr1b upon p53 for upregulation was evaluated in p53 knockout mice. Wild-type (wt) or p53-/- mice were treated singly or in combination with gamma irradiation (IR) and/or the potent DNA damaging agent, diethylnitrosoamine (DEN). Both IR and DEN induced mdr1b in wild-type animals, but not in the p53-/- mice. IR also upregulated endogenous mdr1b in the H35 liver cell line, and the mdr1b promoter was activated by IR and activation correlated with p53 levels; moreover activation required an intact p53 binding site. Colony survival studies revealed that co-transfection of both mdr1b and p53 dramatically reduced colony numbers compared to cells transfected with either p53 or mdr1b alone and cells microinjected with both mdr1b and p53 had a more dramatic loss in viability compared to cells injected with either expression vector alone. Further studies using acridine orange and ethidium bromide to measure apoptosis revealed that mdr1b caused apoptosis and this was enhanced by p53, however the increased apoptosis required a functional p53 transactivation domain. These studies indicate that mdr1b is a downstream target of p53 in the whole animal and expression of mdr1b facilitates p53-mediated cell death." @default.
• W2076096616 created "2016-06-24" @default.
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• W2076096616 date "2001-01-01" @default.
• W2076096616 modified "2023-10-18" @default.
• W2076096616 title "Mdr1b facilitates p53-mediated cell death and p53 is required for Mdr1b upregulation in vivo" @default.
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• W2076096616 doi "https://doi.org/10.1038/sj.onc.1204065" @default.
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