Search results for "Cytogenetic Techniques"

showing 4 items of 4 documents

MET-EGFR dimerization in lung adenocarcinoma is dependent on EGFR mtations and altered by MET kinase inhibition

2017

Advanced lung cancer has poor survival with few therapies. EGFR tyrosine kinase inhibitors (TKIs) have high response rates in patients with activating EGFR mutations, but acquired resistance is inevitable. Acquisition of the EGFR T790M mutation causes over 50% of resistance; MET amplification is also common. Preclinical data suggest synergy between MET and EGFR inhibitors. We hypothesized that EGFR-MET dimerization determines response to MET inhibition, depending on EGFR mutation status, independently of MET copy number. We tested this hypothesis by generating isogenic cell lines from NCI-H1975 cells, which co-express L858R and T790M EGFR mutations, namely H1975L858R/T790M (EGFR TKI resista…

0301 basic medicineLung NeoplasmsKinase InhibitorsCancer Treatmentlcsh:MedicinePhysical ChemistryBiochemistryFluorophotometryT790MSpectrum Analysis Techniques0302 clinical medicineFluorescence Resonance Energy TransferMedicine and Health SciencesPhosphorylationEnzyme Inhibitorslcsh:ScienceExtracellular Signal-Regulated MAP KinasesEGFR inhibitorsStainingMice Inbred BALB CMultidisciplinaryFluorescent in Situ HybridizationPhysicsCell StainingProto-Oncogene Proteins c-metPrecipitation TechniquesErbB ReceptorsChemistryOncologySpectrophotometry030220 oncology & carcinogenesisPhysical SciencesErlotinibDimerizationProtein BindingResearch Articlemedicine.drugChemical physicsMice NudeMolecular Probe TechniquesAdenocarcinoma of LungAdenocarcinomaBiologyResearch and Analysis Methods03 medical and health sciencesGefitinibGrowth factor receptorCell Line TumormedicineAnimalsHumansImmunoprecipitationMolecular Biology TechniquesLung cancerProtein Kinase InhibitorsMolecular BiologyCell ProliferationCell growthlcsh:RReproducibility of ResultsBiology and Life SciencesDimers (Chemical physics)medicine.diseaseMolecular biologyIsogenic human disease modelsProbe Hybridizationrespiratory tract diseasesHEK293 Cells030104 developmental biologyChemical PropertiesSpecimen Preparation and TreatmentFocal Adhesion Protein-Tyrosine KinasesMutationEnzymologylcsh:QProtein MultimerizationProto-Oncogene Proteins c-aktCytogenetic TechniquesPLOS ONE
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Value of nude mice xenografts in the expression of cell heterogeneity of human sarcomas of bone and soft tissue.

1988

Summary Nude mice xenotransplants have been performed on human primary sarcomas of bone and soft tissues in order to delve into the cell heterogeneity of these neoplasms. Particular emphasis has been given to the group of small round blue cell sarcomas (Ewing's sarcomas and peripheral neuroectodermal tumors). Out of 31 xenotransplanted sarcomas, 16 cases have grown positively, and many of them continue to be transferred into nude mice on a regular time basis, being presently considered as fully established nude lines. Here we report the results of such a system, which has been followed with optical, electron microscopical, immunohistochemical and cytogenetic techniques. Osteosarcomas make u…

MalePathologymedicine.medical_specialtyCellTransplantation HeterologousMice NudeBone NeoplasmsSoft Tissue NeoplasmsSarcoma EwingBiologyPathology and Forensic MedicineMicemedicineAnimalsOsteosarcomaHistiocytoma Benign FibrousMesenchymal stem cellSoft tissueCell Biologymedicine.diseaseCytokeratin positivemedicine.anatomical_structureImmunohistochemistrySarcomaNeoplasm TransplantationCytogenetic TechniquesPathology, research and practice
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Metilazione del DNA in artrite reumatoide

2005

Lo stato di metilazione del DNA genomico e del gene PTHrP è stato valutato con tecniche molecolari e citogenetiche in artrite reumatoide (AR), patologia autoimmune caratterizzata anche da alta incidenza di linfomi e da ipercalcemia per overespressione del gene PTHrP. La metilazione del DNA, infatti, ha un ruolo critico nello sviluppo delle malattie neoplastiche; il gene PTHrP avendo tre promotori uno dei quali contiene un’isola CpG è un buon candidato per la deregolazione da alterato pattern di metilazione locale. Le indagini sulla metilazione genomica, condotte su DNA estratto da sangue periferico di pazienti e di donatori e amplificato in reazioni di Methylation-Sensitive Arbitrarily Prim…

Settore BIO/18 - Geneticainstead chromosomes of controls were almost uniformly decorated by brilliant grains. Studies on methylation of PTHrP gene promoter 2 performed on five CpG island internal sites using the Methylation-Sensitive Restriction Endonuclease Multiplex (MSREM)-PCR showed that one of the sites nearest the trascription starting point is heavy methylated in a significantly high number of RA patients. Thus RA seems to be characterized by genomewide hypomethylation associated with local hypermethylation like the most part of tumors. This result raises the possibility that susceptibility to lymphomas is related to abnormal DNA methylation levels and suggests the opportunity to evaluate the DNA methylation status in RA patientin fact the demethylating therapies together with diet and life style can act towards an increase of tumor risk. Future studies using a larger number of subjects could confirm these findings.Rheumatoid Arthritis (RA) is a chronic multisystem inflammatory disease characterized by high recurrence of lymphomas as well as hypercalcemia due to PTHrP overexpression. Because of DNA methylation plays a critical role in development of neoplasias we determined in RA patients the global DNA methylation status and local methylation pattern of the CpG island of one of the three promoters of PTHrP gene utilizing molecular and cytogenetic techniques. Investigations performed on DNA from peripheral blood of patients and donors amplified by Methylation-Sensitive Arbitrarily Primed (MeS-AP)-PCR indicated that RA is strongly associated with global DNA hypomethylation. Similarly chromosomal DNA methylation pattern analysis by indirect immunofluorescence technique with anti 5-methylcitosine antibody showed all peripheral lymphocyte metaphases from RA patients with chromosomes weakly fluorescent without discrete grain
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Interstitial Telomeric-like Repeats (ITR) in Seed Plants as Assessed by Molecular Cytogenetic Techniques: A Review.

2021

The discovery of telomeric repeats in interstitial regions of plant chromosomes (ITRs) through molecular cytogenetic techniques was achieved several decades ago. However, the information is scattered and has not been critically evaluated from an evolutionary perspective. Based on the analysis of currently available data, it is shown that ITRs are widespread in major evolutionary lineages sampled. However, their presence has been detected in only 45.6% of the analysed families, 26.7% of the sampled genera, and in 23.8% of the studied species. The number of ITR sites greatly varies among congeneric species and higher taxonomic units, and range from one to 72 signals. ITR signals mostly occurs…

in situ hybridisationEcologyPhylogenetic treeRange (biology)chromosomal landmarksBotanyChromosomePlant ScienceReviewBiologybiology.organism_classificationIntraspecific competitionGymnospermkaryological evolutionEvolutionary biologyQK1-989Plant chromosomesHomologous chromosomeinterstitial telomeric repeatsEcology Evolution Behavior and SystematicsCytogenetic TechniquesPlants (Basel, Switzerland)
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