Search results for "MEF2 Transcription Factors"

showing 3 items of 3 documents

SOCS2 controls proliferation and stemness of hematopoietic cells under stress conditions and its deregulation marks unfavorable acute leukemias

2015

Abstract Hematopoietic stem cells (HSC) promptly adapt hematopoiesis to stress conditions, such as infection and cancer, replenishing bone marrow–derived circulating populations, while preserving the stem cell reservoir. SOCS2, a feedback inhibitor of JAK–STAT pathways, is expressed in most primitive HSC and is upregulated in response to STAT5-inducing cytokines. We demonstrate that Socs2 deficiency unleashes HSC proliferation in vitro, sustaining STAT5 phosphorylation in response to IL3, thrombopoietin, and GM-CSF. In vivo, SOCS2 deficiency leads to unrestricted myelopoietic response to 5-fluorouracil (5-FU) and, in turn, induces exhaustion of long-term HSC function along serial bone marro…

Cancer ResearchMyeloidSuppressor of Cytokine Signaling ProteinsMice TransgenicNeoplasm ProteinMiceBone MarrowSuppressor of Cytokine Signaling ProteinmedicineAnimalsHumansMEF2 Transcription FactorThrombopoietinSTAT5Cell ProliferationRegulation of gene expressionABLLeukemiabiologyMEF2 Transcription FactorsAnimalMedicine (all)Animals; Bone Marrow; Cell Differentiation; Cell Proliferation; Fluorouracil; Gene Expression Regulation Neoplastic; Hematopoietic Stem Cells; Humans; Leukemia; MEF2 Transcription Factors; Mice; Mice Transgenic; Neoplasm Proteins; Neoplastic Stem Cells; Suppressor of Cytokine Signaling Proteins; Cancer Research; Oncology; Medicine (all)breakpoint cluster regionCell DifferentiationHematopoietic Stem CellHematopoietic Stem CellsNeoplasm ProteinsGene Expression Regulation NeoplasticHaematopoiesismedicine.anatomical_structureOncologyImmunologybiology.proteinCancer researchNeoplastic Stem CellsFluorouracilNeoplastic Stem CellStem cellHuman
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The muscleblind gene participates in the organization of Z-bands and epidermal attachments of Drosophila muscles and is regulated by Dmef2.

1998

We report the embryonic phenotype of muscleblind (mbl), a recently described Drosophila gene involved in terminal differentiation of adult ommatidia. mbl is a nuclear protein expressed late in the embryo in pharyngeal, visceral, and somatic muscles, the ventral nerve cord, and the larval photoreceptor system. All three mbl alleles studied exhibit a lethal phenotype and die as stage 17 embryos or first instar larvae. These larvae are partially paralyzed, show a characteristically contracted abdomen, and lack striation of muscles. Our analysis of the somatic musculature shows that the pattern of muscles is established correctly, and they form morphologically normal synapses. Ultrastructural a…

Central Nervous SystemSomatic cellMuscle Fibers SkeletalNeuromuscular JunctionMuscle ProteinsGenes InsectBiologymuscle attachmentsmuscleblindMesodermTendonsEctodermAnimalsDrosophila ProteinsConnectinRNA MessengerNuclear proteinMuscle SkeletalMolecular BiologyZ-bandsCell NucleusEpidermis (botany)MyogenesisMEF2 Transcription FactorsDrosophila.Gene Expression Regulation DevelopmentalNuclear ProteinsEmbryoCell DifferentiationCell BiologyAnatomybacterial infections and mycosesEmbryonic stem cellPhenotypeCell biologyDNA-Binding ProteinsMyogenic Regulatory FactorsVentral nerve cordMutationInsect ProteinsDrosophilaPhotoreceptor Cells InvertebratemyogenesisDevelopmental BiologyTranscription FactorsDevelopmental biology
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EZH2 mutations are frequent and represent an early event in follicular lymphoma

2013

Gain of function mutations in the H3K27 methyltransferase EZH2 represent a promising therapeutic target in germinal center lymphomas. In this study, we assessed the frequency and distribution of EZH2 mutations in a large cohort of patients with follicular lymphoma (FL) (n = 366) and performed a longitudinal analysis of mutation during the disease progression from FL to transformed FL (tFL) (n = 33). Mutations were detected at 3 recurrent mutation hot spots (Y646, A682, and A692) in 27% of FL cases with variant allele frequencies (VAF) ranging from 2% to 61%. By comparing VAF of EZH2 with other mutation targets (CREBBP, MLL2, TNFRSF14, and MEF2B), we were able to distinguish patients harbori…

endocrine systemTime FactorsMethyltransferasemedicine.medical_treatmentDNA Mutational AnalysisImmunologyFollicular lymphomaKaplan-Meier Estimatemacromolecular substancesBiologymedicine.disease_causeBiochemistryTargeted therapyCohort StudiesGene Frequencyhemic and lymphatic diseasesBiomarkers TumormedicineHumansEnhancer of Zeste Homolog 2 ProteinLymphoma FollicularAllele frequencyMutationLymphoid NeoplasiaMEF2 Transcription FactorsGene Expression ProfilingEZH2Polycomb Repressive Complex 2Germinal centerCell BiologyHematologymedicine.diseaseCREB-Binding ProteinLymphomaMutationDisease ProgressionCancer researchReceptors Tumor Necrosis Factor Member 14Blood
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