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• W2003642703 abstract "Mammalian Stanniocalcin-1 (STC1) is a glycoprotein that has been implicated in various biological processes including angiogenesis. Aberrant STC1 expression has been reported in breast, ovarian and prostate cancers, but the significance of this is not well understood. Here, we report that oxidative stress caused a 40-fold increase in STC1 levels in mouse embryo fibroblasts (MEFs). STC1−/− MEFs were resistant to growth inhibition and cell death induced by H2O2 or by 20% O2 (which is hyperoxic for most mammalian cells); this is the first phenotype reported for STC1-null cells. STC1−/− cells had higher levels of activated MEK and ERK1/2 than their wild-type (WT) counterparts, and these levels were all reduced by stable expression of exogenous STC1 in STC1−/− cells. Furthermore, pharmacological inhibition by PD98059 or UO126 of MEK and therefore of ERK1/2 activation restored sensitivity of STC1−/− cells to oxidative stress. We also found that H2O2-induced STC1 expression in WT cells was abolished by inhibition of ERK1/2 activation. Thus, the ERK1/2 signaling pathway upregulates STC1 expression, which in turn downregulates the level of activated MEK and consequently ERK1/2 in a novel negative feedback loop. Therefore, STC1 expression downregulates prosurvival ERK1/2 signaling and reduces survival under conditions of oxidative stress." @default.
• W2003642703 created "2016-06-24" @default.
• W2003642703 creator A5005955416 @default.
• W2003642703 creator A5041519459 @default.
• W2003642703 creator A5050482798 @default.
• W2003642703 date "2009-04-06" @default.
• W2003642703 modified "2023-10-16" @default.
• W2003642703 title "Stanniocalcin-1 acts in a negative feedback loop in the prosurvival ERK1/2 signaling pathway during oxidative stress" @default.
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• W2003642703 doi "https://doi.org/10.1038/onc.2009.65" @default.
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