Search results for "RPTOR"

showing 4 items of 4 documents

PTEN status is a crucial determinant of the functional outcome of combined MEK and mTOR inhibition in cancer

2017

AbstractCombined MAPK/PI3K pathway inhibition represents an attractive, albeit toxic, therapeutic strategy in oncology. Since PTEN lies at the intersection of these two pathways, we investigated whether PTEN status determines the functional response to combined pathway inhibition. PTEN (gene, mRNA, and protein) status was extensively characterized in a panel of cancer cell lines and combined MEK/mTOR inhibition displayed highly synergistic pharmacologic interactions almost exclusively in PTEN-loss models. Genetic manipulation of PTEN status confirmed a mechanistic role for PTEN in determining the functional outcome of combined pathway blockade. Proteomic analysis showed greater phosphoprote…

0301 basic medicineMAPK/ERK pathwayPTENRNA interferenceprotein Kinase inhibitorsRNA Small InterferinghumansPhosphoinositide-3 Kinase InhibitorsAnimals; cell line tumor; drug synergism; everolimus; female; humans; Janus Kinase 1; MAP Kinase Kinase Kinases; mice; neoplastic stem cells; PTEN phosphohydrolase; phosphatidylinositol 3-Kinases; protein Kinase inhibitors; proto-oncogene Proteins c-akt; Pyridones; Pyrimidinones; RNA Interference; RNA Small Interfering; STAT3 Transcription Factor; TOR Serine-Threonine KinasesMultidisciplinaryMAPK/PI3K pathway inhibitiononcology MAPK/PI3K pathway inhibitionTOR Serine-Threonine Kinasescell lineMAPK/PI3K inhibition oncology. inhibition. PTEN gene mRNA cancer cell lines MEK/mTORMAP Kinase Kinase KinasesfemaleoncologymTORRNA InterferenceSTAT3 Transcription FactortumormicePyridonesMice NudePyrimidinonesBiologyphosphatidylinositol 3-KinasesSmall InterferingArticle03 medical and health sciencesMediatorSettore MED/04 - PATOLOGIA GENERALECell Line TumormedicinePTENAnimalsPI3K/AKT/mTOR pathwaydrug synergismSettore MED/06 - ONCOLOGIA MEDICAneoplastic stem cellsRPTORCancerJanus Kinase 1medicine.diseaseeverolimusproto-oncogene Proteins c-aktBlockade030104 developmental biologyCancer researchbiology.proteinRNAPTEN phosphohydrolase
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Novel pathway in Bcr-Abl signal transduction involves Akt-independent, PLC-γ1-driven activation of mTOR/p70S6-kinase pathway

2009

In chronic myeloid leukemia, activation of the phosphoinositide 3-kinase (PI3K)/Akt pathway is crucial for survival and proliferation of leukemic cells. Essential downstream molecules involve mammalian target of rapamycin (mTOR) and S6-kinase. Here, we present a comprehensive analysis of the molecular events involved in activation of these key signaling pathways. We provide evidence for a previously unrecognized phospholipase C-gamma1 (PLC-gamma1)-controlled mechanism of mTOR/p70S6-kinase activation, which operates in parallel to the classical Akt-dependent machinery. Short-term imatinib treatment of Bcr-Abl-positive cells caused dephosphorylation of p70S6-K and S6-protein without inactivat…

Cancer ResearchBlotting WesternMedizinFusion Proteins bcr-ablApoptosisProtein Serine-Threonine KinasesBiologyPiperazinesMiceLeukemia Myelogenous Chronic BCR-ABL Positivehemic and lymphatic diseasesGeneticsAnimalsHumansRNA Small InterferingProtein Kinase InhibitorsMolecular BiologyProtein kinase BCAMKPI3K/AKT/mTOR pathwayPhospholipase C gammaCell growthKinaseTOR Serine-Threonine KinasesRPTORIntracellular Signaling Peptides and ProteinsRibosomal Protein S6 Kinases 70-kDaCell biologyEnzyme ActivationPyrimidinesBenzamidesembryonic structuresImatinib MesylateCancer researchPhosphorylationSignal transductionProto-Oncogene Proteins c-aktSignal TransductionOncogene
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From Targets to Targeted Therapies in Hepatocellular Carcinoma

2014

MAPK/ERK pathwaybusiness.industrymedicine.medical_treatmentRPTORmedicine.diseaseBiochemistryTargeted therapyHepatocellular carcinomaGeneticsCancer researchMolecular MedicineMedicinebusinessBiotechnologyForum on Immunopathological Diseases and Therapeutics
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Synergistic Growth Inhibitory Activity of Combined Mek/Mtor Pathway Blockade in Pten-Null Cancers

2014

ABSTRACT Aim: We have recently shown that induction of PTEN expression plays an integral role in MEK inhibitors' antitumor activity. Here we hypothesize that PTEN status critically influences the functional outcome of combined MEK and PI3K/mTOR inhibition. Methods: Single and combined MEK (trametinib, T) and mTOR (everolimus, E) blockade were assessed in a panel of cancer cell lines and in patient-derived lung and colon cancer stem cells (L- or C-CSC). Pharmacologic interactions were analyzed by conservative isobologram analysis. PTEN role was assessed by shRNA-mediated silencing or overexpression by stable transfection. Treatment-induced changes in the phosphoproteome were analyzed by anti…

MEK/MTORMAPK/ERK pathwayTrametinibPhosphoinositide 3-kinasebiologyKinaseRPTORHematologyOncologySettore MED/04 - PATOLOGIA GENERALEbiology.proteinCancer researchPTENProtein kinase BPI3K/AKT/mTOR pathwayAnnals of Oncology
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