Search results for "Mad2 Proteins"

showing 4 items of 4 documents

MAD2 depletion triggers premature cellular senescence in human primary fibroblasts by activating a P53 pathway preventing aneuploid cells propagation.

2012

The spindle assembly checkpoint (SAC) is a cellular surveillance mechanism that ensures faithful chromosome segregation during mitosis and its failure can result in aneuploidy. Previously, it was suggested that reduction of the MAD2 gene, encoding a major component of the SAC, induced aneuploidy in human tumor cells. However, tumor cell lines contain multiple mutations that might affect or exacerbate the cellular response to Mad2 depletion. Thus, the scenario resulting by Mad2 depletion in primary human cells could be different and more complex that the one depicted so far. We used primary human fibroblasts (IMR90) and epithelial breast cells (MCF10A) to gain further insight on the effects …

Genome instabilityCyclin-Dependent Kinase Inhibitor p21Cell cycle checkpointMad2PhysiologyClinical BiochemistryMAD2 depletion Aneuploidy Premature cellular senescence TP53Cell Cycle ProteinsBiologyCyclin-dependent kinaseChromosome instabilityChromosomal InstabilityTumor Suppressor Protein p14ARFHumansGene SilencingRNA Small InterferingMitosisCells CulturedCellular SenescenceCell ProliferationCalcium-Binding ProteinsCell BiologyCell Cycle CheckpointsFibroblastsAneuploidybeta-GalactosidaseCell biologyRepressor ProteinsSpindle checkpointSettore BIO/18 - GeneticaGene Expression RegulationMad2 Proteinsbiology.proteinM Phase Cell Cycle CheckpointsTumor Suppressor Protein p53Cell agingSignal Transduction
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p14(ARF) Prevents Proliferation of Aneuploid Cells by Inducing p53-Dependent Apoptosis.

2014

Weakening the Spindle Assembly Checkpoint by reduced expression of its components induces chromosome instability and aneuploidy that are hallmarks of cancer cells. The tumor suppressor p14(ARF) is overexpressed in response to oncogenic stimuli to stabilize p53 halting cell progression. Previously, we found that lack or reduced expression of p14(ARF) is involved in the maintenance of aneuploid cells in primary human cells, suggesting that it could be part of a pathway controlling their proliferation. To investigate this aspect further, p14(ARF) was ectopically expressed in HCT116 cells after depletion of the Spindle Assembly Checkpoint MAD2 protein that was used as a trigger for aneuploidy. …

Mad2 ProteinApoptosis; M Phase Cell Cycle Checkpoints; Mad2 Proteins; RNA Interference; Tumor Suppressor Protein p14ARF; AneuploidyApoptosiMitosisApoptosisM Phase Cell Cycle CheckpointAneuploidyHCT116 CellsSettore BIO/18 - GeneticaGene Knockout TechniquesMad2 ProteinsTumor Suppressor Protein p14ARFHumansM Phase Cell Cycle CheckpointsRNA InterferenceTumor Suppressor Protein p53Cell ProliferationJournal of cellular physiology
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Expression of spindle assembly checkpoint proteins BubR1 and Mad2 expression as potential biomarkers of malignant transformation of oral leukoplakia:…

2021

Background The Spindle Assembly Checkpoint (SAC) is a surveillance mechanism essential to ensure the accuracy of chromosome segregation during mitosis. Our aim was to evaluate the expression of SAC proteins in oral carcinogenesis, and to assess their potential in predicting malignant transformation of oral leukoplakia. Material and Methods We analysed the immunoexpression of BubR1, Mad2, Bub3, and Spindly proteins in 64 oral biopsies from 52 oral leukoplakias and 12 normal tissues. Univariate and multivariate analysis were performed to evaluate predictive factors for malignant transformation (MT). Results We observed that BubR1 and Mad2 were more highly expressed in high dysplasia grade les…

Mad2BUB3medicine.disease_causeMalignant transformationOral Cancer and Potentially malignant disordersmedicineoral dysplasiawnt ligandsHumansGeneral DentistryMitosisUNESCO:CIENCIAS MÉDICASLeukoplakiadestruction complexbusiness.industryResearchoral cancermedicine.disease?-cateninSpindle checkpointstomatognathic diseasesCell Transformation NeoplasticOtorhinolaryngologyDysplasiaMad2 ProteinsCancer researchM Phase Cell Cycle CheckpointsSurgeryLeukoplakia OralbusinessCarcinogenesisBiomarkersMedicina Oral, Patología Oral y Cirugía Bucal
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Aneuploid IMR90 cells induced by depletion of pRB, DNMT1 and MAD2 show a common gene expression signature

2019

Chromosome segregation defects lead to aneuploidy which is a major feature of solid tumors. How diploid cells face chromosome mis-segregation and how aneuploidy is tolerated in tumor cells are not completely defined yet. Thus, an important goal of cancer genetics is to identify gene networks that underlie aneuploidy and are involved in its tolerance. To this aim, we induced aneuploidy in IMR90 human primary cells by depleting pRB, DNMT1 and MAD2 and analyzed their gene expression profiles by microarray analysis. Bioinformatic analysis revealed a common gene expression profile of IMR90 cells that became aneuploid. Gene Set Enrichment Analysis (GSEA) also revealed gene-sets/pathways that are …

DNA (Cytosine-5-)-Methyltransferase 1AneuploidyBiologyMicroarrayReal-Time Polymerase Chain ReactionRetinoblastoma ProteinCell LineRNA interferenceGene expressionProtein Interaction MappingGeneticsmedicineHumansGeneOligonucleotide Array Sequence AnalysisMicroarray analysis techniquesGene Expression ProfilingBioinformatics analysiChromosomeFibroblastsmedicine.diseaseAneuploidyGene Expression RegulationRNAiMad2 ProteinsDNMT1Cancer researchKIF4ARNA InterferenceTranscriptomeIMR90 human fibroblast
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