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- W2145890361 abstract "Reactive oxygen species (ROS) are important signaling molecules in cells. Excessive ROS induce expression of inflammatory mediators, such as iNOS and COX2. Antioxidant enzymes, such as, heme oxygenase-1 (HO-1), tightly regulate ROS levels within cells. Here, we show that Bay 11-7082 (Bay) increased HO-1 mRNA and protein expression in human colon cancer HT29 cells. Bay induced translocation of NF-E2-related factor 2 (Nrf2) into nuclei and increased the binding activity of the antioxidant response element (ARE). In addition, PI3K/Akt inhibitor (LY294002) blocked Bay-induced HO-1 expression. Pretreatment with anti-oxidants (N-acetylcysteine (NAC) or glutathione) significantly reduced Bay-induced HO-1 mRNA/protein expression, nuclear translocation of Nrf2 and phosphorylation of Akt. However, PI3K/Akt signaling was independent of Bay-induced Nrf2 translocation and ARE binding activity. Furthermore, other NF-κB inhibitors, such as pyrrolidine dithiocarbamate (PDTC) and MG132, also increased HO-1 mRNA and protein expression. However, although overexpression of dominant negative inhibitory κB (IκB) reduced NF-κB-driven transcriptional activity, IκB overexpression did not increase HO-1 expression. Taken together, our results suggest that in human colon cancer HT29 cells, Bay induces HO-1 expression by increasing ROS production in an Nrf2–ARE and PI3K dependent manner, but Bay acts independently of NF-κB." @default.
- W2145890361 created "2016-06-24" @default.
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- W2145890361 date "2011-09-01" @default.
- W2145890361 modified "2023-10-02" @default.
- W2145890361 title "An IκBα phosphorylation inhibitor induces heme oxygenase-1(HO-1) expression through the activation of reactive oxygen species (ROS)–Nrf2–ARE signaling and ROS–PI3K/Akt signaling in an NF-κB-independent mechanism" @default.
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- W2145890361 doi "https://doi.org/10.1016/j.cellsig.2011.05.013" @default.
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