Set9 inhibits oxidative stress‐induced neuronal cell death via methylation of FOXO3. Set9 inhibits oxidative stress‐induced neuronal cell death via methylation.

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Set9 inhibits oxidative stress‐induced neuronal cell death via methylation of FOXO3. Set9 inhibits oxidative stress‐induced neuronal cell death via methylation of FOXO3. (A) CGNs were transfected with the FOXO3, Set9 WT, Set9 H297A or control vector together with FKRE‐luciferase reporter gene and tk‐renilla reporter. Set9 significantly inhibits FOXO3's transcriptional activity in CGNs (t‐test, P<0.01, n=3). (B) CGNs were transfected with the FOXO3 or the control vector with or without Set9 shRNA plasmid (#1 or #2), together with FKRE‐luciferase/tk‐renilla reporter. Knockdown of Set9 considerably increases the transcriptional activity of FOXO3 (t‐test, P<0.01, n=3). (C) Total RNA was isolated from cultured Neuro2A cells and cDNA was synthesized by reverse transcription, followed by real‐time PCR. Knockdown of Set9 considerably increases the expression of Bim (t‐test, P<0.01, n=3). (D) CGNs transfected with the Set9 RNAi plasmid (sh‐Set9 #1 and #2) or control vector (sh‐Luc) together with GFP vector were treated with H2O2. Yellow arrowhead stands for the healthy cells and red arrowhead indicates apoptotic cells. Set9 knockdown increases cell apoptosis upon H2O2 treatment (ANOVA followed by Fisher's PLSD post hoc, P<0.01, n=4). (E) CGNs transfected with the Set9 RNAi plasmid (sh‐Set9 #1) or control vector (sh‐Luc), FOXO3 RNAi plasmid (U6/FOXO3) or its control vector U6 together with GFP vector were treated with H2O2. Set9 knockdown increases FOXO‐dependent cell apoptosis upon H2O2 treatment (ANOVA followed by Fisher's PLSD post hoc, P<0.01, n=3). (F) Left panel: CGNs transfected with the FOXO3 RNAi plasmid (U6/FOXO3) together with indicated plasmids were treated with H2O2, and cell death was analysed as in E. Data are presented as mean±s.e.m. (ANOVA followed by Fisher's PLSD post hoc, P<0.01, n=3). Right panel: Lysates of 293T cells transfected with indicated plasmids were immunoblotted with anti‐GFP or ERK1/2 antibody. ANOVA, analysis of variance; cDNA, complimentary DNA; CGN, cerebellar granule neuron; FKRE, forkhead response element; GFP, green fluorescent protein; mRNA, messenger RNA; RNAi, RNA‐mediated interference; shRNA, small hairpin RNA. Qi Xie et al. EMBO Rep. 2012;13:371-377 © as stated in the article, figure or figure legend