Journal: Nature Communications
Article Title: WEE1 inhibitors trigger GCN2-mediated activation of the integrated stress response
doi: 10.1038/s41467-025-66514-0
Figure Lengend Snippet: a Gene set enrichment analysis of RNA-seq data of RPE1 TP53 KO control and EIF2A KO cells (more detailed analysis in Supplementary Fig. ). Circle size represents gene set size (control: n = 3, EIF2A KO : n = 1). b , c SILAC-based proteomics analysis of RPE1 TP53 KO control and EIF2A KO cells, showing differential protein expression at baseline ( b ) and upon AZD1775 treatment for 6, 24 and 48 h ( c ) (n = 2). Red datapoint indicates eIF2A, green datapoints indicate other screen hits. d RPE1 TP53 KO control and EIF2A KO cells were treated with AZD1775 or Debio 0123 (1 µM) for 24 h, followed by a 10’ puromycin pulse. Puromycin incorporation was visualized by immunoblotting (left) and quantified (right). Data represent mean ± SD; RPE1 TP53 KO EIF2A KO treated with Debio 0123 (n = 4); control RPE1 TP53 KO treated with DMSO or AZD1775 (n = 7); Other conditions (n = 5). e RPE1 TP53 KO PAC KO cells were treated with AZD1775 (250 nM) and ISRIB for 24 h and subsequently labeled with L-azidohomoalanine (AHA). Immunoblot of AHA-labeled proteins and quantification is shown. Data represent mean and individual datapoints (n = 2). f Schematic overview of the CRISPR/Cas9 genome-wide AZD1775 resistance screen. g MAGeCK scores for individual genes in the RPE1 TP53 KO AZD1775 positive selection screen (day 12 vs day 0). h Cell confluency analysis of parental RPE1 TP53 KO PAC KO or GCN2 KO cells. Mean ± range, n = 3 for control and GCN2 KO #1, n = 2 for GCN2 KO #2. i Quantification of clonogenic survival assays of parental RPE1 TP53 KO PAC KO and ATF4 KO cells (corresponding images provided in Supplementary Fig. ). Mean ± SD, n = 3 for all conditions. j , k Representative histograms ( j ) and quantification ( k ) of ATF4-mScarlet flow cytometry measurements in RPE1 TP53 KO ATF4-mScarlet reporter cells treated with thapsigargin (1 µM), AZD1775 (1 µM), Debio 0123 (1 µM) and/or A92 (1 µM) for 24 h. Data represent mean ± SD (n = 3). Statistical analysis of ( d , k ): unpaired t-test (two-sided) with p ≤ 0.05 considered significant. All replicates are biological replicates unless indicated otherwise. Source data are provided as a file.
Article Snippet: The chemicals used in this study were AZD1775 (#1494, Axon Medchem or S1525, Selleck Chemicals), Debio 0123 (S9778, Selleckchem), A92 (#2720, Axon Medchem), RP-6306 (gift from Repare Therapeutics), AZD7762 (#1399, Axon Medchem), VE-822 (#2452, Axon Medchem), ZNL 02-096 (7240, Tocris), thapsigargin (T9033, Merck), doxorubicin (sc-280681, Santa Cruz Biotechnology), nocodazole (M1404, Sigma), palbociclib (1505, Axon Medchem), integrated stress response inhibitor (ISRIB; SML0843, Sigma or S7400, Selleckchem), salubrinal (S2923, Selleckchem), GCN2iB (S8929, Selleckchem), neratinib (#1526, Axon Medchem) and Emetine (E521535, Toronto Research Chemicals).
Techniques: RNA Sequencing, Control, Multiplex sample analysis, Expressing, Western Blot, Labeling, CRISPR, Genome Wide, Selection, Flow Cytometry