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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

Authors
Min, KJ; Lee, JT; Joe, EH; Kwon, TK
Citation
Cellular signalling, 23(9):1505-1513, 2011
Journal Title
Cellular signalling
ISSN
0898-65681873-3913
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.
MeSH terms
Analysis of VarianceElectrophoretic Mobility Shift AssayGene Expression RegulationGlutathione/pharmacologyHT29 CellsHeme Oxygenase-1/*metabolismHumansImmunohistochemistryLeupeptins/pharmacologyNF-E2-Related Factor 2/metabolismNF-kappa B/antagonists & inhibitorsNitriles/*pharmacologyPhosphatidylinositol 3-Kinases/metabolismPhosphorylationProline/analogs & derivatives/pharmacologyProto-Oncogene Proteins c-akt/metabolismRNA, Messenger/metabolismReactive Oxygen Species/*metabolismResponse Elements*Signal TransductionSulfones/*pharmacologyThiocarbamates/pharmacologyTransfection
DOI
10.1016/j.cellsig.2011.05.013
PMID
21620964
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Pharmacology
AJOU Authors
조, 은혜
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