Low-Dose Vertical Inhibition of the RAF-MEK-ERK Cascade Causes Apoptotic Death of KRAS-mutant Cancers
Ontology highlight
ABSTRACT:
PROVIDER: PRJEB38063 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description: Not available
| S-EPMC7393480 | biostudies-literature
Project description:In this study 14 different RAF, MEK, or ERK inhibitors were tested in ASPC1 and PANC1 PDA cell lines
2024-04-28 | GSE252002 | GEO
Project description:The well-known hepatotoxicity mechanism resulting from alpha-amanitin (-AMA) exposure arises from RNA polymerase II (RNAP II) inhibition. RNAP Ⅱ inhibition occurs through the dysregulation of mRNA synthesis. However, the signaling pathways in hepatocytes that arise from -AMA have not yet been fully elucidated. Here, we identified that the RAS/RAF/ERK signaling pathway was activated through quantitative phosphoproteomic and molecular biological analyses. Bioinformatics analysis showed that AMA exposure increased protein phosphorylation in a time-dependent AMA AMA exposure. In addition, phosphorylation increased not only the components of the ERK signaling pathway but also U2AF65 and SPF45, known splicing factors. Therefore, we propose a novel mechanism of -AMA as follows. The RAS/RAF/ERK signaling pathway involved in aberrant splicing events is activated by -AMA exposure followed by aberrant splicing events leading to cell death.
2023-03-11 | PXD035817 | Pride
Project description:The well-known hepatotoxicity mechanism resulting from alpha-amanitin (-AMA) exposure arises from RNA polymerase II (RNAP II) inhibition. RNAP Ⅱ inhibition occurs through the dysregulation of mRNA synthesis. However, the signaling pathways in hepatocytes that arise from -AMA have not yet been fully elucidated. Here, we identified that the RAS/RAF/ERK signaling pathway was activated through quantitative phosphoproteomic and molecular biological analyses. Bioinformatics analysis showed that AMA exposure increased protein phosphorylation in a time-dependent AMA AMA exposure. In addition, phosphorylation increased not only the components of the ERK signaling pathway but also U2AF65 and SPF45, known splicing factors. Therefore, we propose a novel mechanism of -AMA as follows. The RAS/RAF/ERK signaling pathway involved in aberrant splicing events is activated by -AMA exposure followed by aberrant splicing events leading to cell death.
2023-03-11 | PXD035758 | Pride
Project description:The signaling network of skeletal muscle cells is controlled by a variety of protein kinases. Although many kinases are known players, their downstream targets are still largely unexplored. To gain further knowledge about the PI3K-AKT-mTOR-S6K and the RAF-MEK-ERK-RSK signaling networks in myotubes, we analyzed changes in protein phosphorylation levels upon pathway activation and direct kinase inhibition on a global scale. Based on the phosphoproteomics data, we further examined target relationships of the basophilic kinases AKT, RSK and S6K, which share the substrate recognition motif RxRxxp[ST].
2023-02-22 | PXD029678 | Pride
Project description:Disruption of the MAPK pathway in cancer by kinase inhibition often fails due to pathway reactivation, causing clinical relapse. Among MAPK inhibitors, type I RAF inhibitors are only active against specific BRAF mutants; MEK inhibitor monotherapy is associated with limited clinical benefits but may serve as a foundation for combinatorial therapy. Here, we show that type II RAF plus allosteric MEK inhibitors durably blunt the development of acquired MEK inhibitor resistance among cancers with KRAS, NRAS, NF1, BRAFnon-V600 and BRAFV600 mutations, when compared to a combination of type II RAF plus ERK inhibitors. Type II RAF and MEK (versus ERK) inhibitors also display superior capacity to sequester MEK in RAF complexes and uncouple MEK and ERK interaction in acquired resistant tumor subpopulations. Systemically and intratumorally, type II RAF plus MEK inhibitors expand memory and activated/exhausted CD8+ T-cells. Whereas trametinib alone temporally reduces dominant intra-tumoral T-cell clones, type II RAF inhibitor co-treatment reverses this effect and promotes T-cell clonotypic expansion and convergence. Importantly, durably control of tumors by this combination requires CD8+ T-cells. Thus, the prolonged anti-tumor efficacy of type II RAF plus MEK inhibitors reveals exquisite MAPK addiction in common lethal cancer histologies, and the mechanisms include unexpected allosteric perturbation of the MAPK pathway and engagement of anti-tumor CD8+ T-cell immunity.
2021-06-06 | GSE158608 | GEO
Project description:Disruption of the MAPK pathway in cancer by kinase inhibition often fails due to pathway reactivation, causing clinical relapse. Among MAPK inhibitors, type I RAF inhibitors are only active against specific BRAF mutants; MEK inhibitor monotherapy is associated with limited clinical benefits but may serve as a foundation for combinatorial therapy. Here, we show that type II RAF plus allosteric MEK inhibitors durably blunt the development of acquired MEK inhibitor resistance among cancers with KRAS, NRAS, NF1, BRAFnon-V600 and BRAFV600 mutations, when compared to a combination of type II RAF plus ERK inhibitors. Type II RAF and MEK (versus ERK) inhibitors also display superior capacity to sequester MEK in RAF complexes and uncouple MEK and ERK interaction in acquired resistant tumor subpopulations. Systemically and intratumorally, type II RAF plus MEK inhibitors expand memory and activated/exhausted CD8+ T-cells. Whereas trametinib alone temporally reduces dominant intra-tumoral T-cell clones, type II RAF inhibitor co-treatment reverses this effect and promotes T-cell clonotypic expansion and convergence. Importantly, durably control of tumors by this combination requires CD8+ T-cells. Thus, the prolonged anti-tumor efficacy of type II RAF plus MEK inhibitors reveals exquisite MAPK addiction in common lethal cancer histologies, and the mechanisms include unexpected allosteric perturbation of the MAPK pathway and engagement of anti-tumor CD8+ T-cell immunity.
2021-06-06 | GSE158607 | GEO
Project description:Disruption of the MAPK pathway in cancer by kinase inhibition often fails due to pathway reactivation, causing clinical relapse. Among MAPK inhibitors, type I RAF inhibitors are only active against specific BRAF mutants; MEK inhibitor monotherapy is associated with limited clinical benefits but may serve as a foundation for combinatorial therapy. Here, we show that type II RAF plus allosteric MEK inhibitors durably blunt the development of acquired MEK inhibitor resistance among cancers with KRAS, NRAS, NF1, BRAFnon-V600 and BRAFV600 mutations, when compared to a combination of type II RAF plus ERK inhibitors. Type II RAF and MEK (versus ERK) inhibitors also display superior capacity to sequester MEK in RAF complexes and uncouple MEK and ERK interaction in acquired resistant tumor subpopulations. Systemically and intratumorally, type II RAF plus MEK inhibitors expand memory and activated/exhausted CD8+ T-cells. Whereas trametinib alone temporally reduces dominant intra-tumoral T-cell clones, type II RAF inhibitor co-treatment reverses this effect and promotes T-cell clonotypic expansion and convergence. Importantly, durably control of tumors by this combination requires CD8+ T-cells. Thus, the prolonged anti-tumor efficacy of type II RAF plus MEK inhibitors reveals exquisite MAPK addiction in common lethal cancer histologies, and the mechanisms include unexpected allosteric perturbation of the MAPK pathway and engagement of anti-tumor CD8+ T-cell immunity.
2021-06-06 | GSE158609 | GEO
Project description:Various protein kinases are regulating the intracellular signaling network of skeletal muscle cells. Despite that many of the involved kinases are known, their downstream targets have remained largely unexplored. To deepen our understanding of the PI3K-AKT-mTOR-S6K and the RAF-MEK-ERK-RSK signaling network in myotubes, we globally analyzed changes in protein phosphorylation levels upon kinase inhibition within these pathways. The phosphoproteomics data were used to define potential targets of the kinases AKT, RSK and S6K, which share the substrate recognition motif RxRxxp[ST].
2023-02-22 | PXD018667 | Pride
Project description:Although KRAS mutation is a hallmark of pancreatic ductal adenocarcinoma (PDA), mutated KRAS remains an intractable pharmacological target. Consequently, an understanding of the RAS effector pathway(s) required for PDA maintenance is critical for improved strategies to treat this disease. Here we demonstrate that expression of BRAFV600E, but not PIK3CAH1047R, in the mouse pancreas led to PanIn lesions. Moreover, concomitant expression of BRAFV600E and TP53R270H resulted in lethal PDA. A large panel of PDA cell line panel was deployed to derive genomic classifiers of MEK inhibitor sensitivity. This classifier correctly predicted survival benefit in two novel in vivo syngeneic, orthotopic models of PDA. Consequently, we conclude that RAF?MEK?ERK signaling is central to the initiation, progression and maintenance of PDA and propose predictive biomarkers of response to MEK inhibition. These data further emphasize the value of leveraging multiple experimental systems to prioritize pathways for intervention in human PDA. RNA was extracted from human PDA cell line samples and hybridized on Affymetrix U133 plus 2.0 microarrays. The CEL files were processed using R based Bioconductor and normalized values were obtained using RMA. RNA was extracted from mouse PDA cell lines and hybridized on Affymetrix Mouse 430a 2.0 microarrays. The CEL files were processed using R based Bioconductor and normalized values were obtained using RMA.
2012-07-09 | E-GEOD-30562 | biostudies-arrayexpress