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- W1998697946 abstract "Abstract Stat1 has been known as a regulator of gene expression and a mediator of IFNγ signaling in mammalian cells, while its effect in a heat shock response remains unclear. We used RNAi knockdown, point mutations, ChIP and promoter activity assays to study the effect of Stat1 on the heat‐shock induction of the hsp90α gene under heat shock conditions. We found that Stat1 regulates the heat shock induction of its target genes, the hsp90α gene in a heat shock response while the constitutive activity of the gene remains unaffected. The result of Stat1 in complex with Stat3 and HSF1 that bound at the GAS to lead a moderate heat shock induction was designated as an “intrinsic” induction of the hsp90α gene. Additionally a reduced or an elevated level of heat shock induction was also controlled by the Stat1 on hsp90α. These diverse effects on the hsp90α gene were a “reduced” induction with over‐expressed Stat1 elicited by transfection of wild‐type Stat1 or IFNγ treatment, bound at the GAS as homodimer; and an “enhanced” heat shock induction with a mutation‐mediated prohibition of Stat1/GAS binding. In conclusion, the status and efficacy of Stat1 bound at the GAS of its target gene are pivotal in determining the impact of Stat1 under heat shock. The results provided the first evidence on the tumor suppressor Stat1 that it could play diverse roles on its target genes under heat shock that also shed lights on patients with fever or under thermotherapy. J. Cell. Biochem. 102: 1059–1066, 2007. © 2007 Wiley‐Liss, Inc." @default.
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- W1998697946 date "2007-04-11" @default.
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- W1998697946 title "Diverse effects of Stat1 on the regulation of hsp90α gene under heat shock" @default.
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- W1998697946 doi "https://doi.org/10.1002/jcb.21342" @default.
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