0000000000021757

AUTHOR

C Brachetti

showing 3 related works from this author

Rho GTPases in human breast tumours: expression and mutation analyses and correlation with clinical parameters

2002

In the present study, we addressed the question of a putative relevance of Rho proteins in tumour progression by analysing their expression on protein and mRNA level in breast tumours. We show that the level of RhoA, RhoB, Rac1 and Cdc42 protein is largely enhanced in all tumour samples analysed (n=15) as compared to normal tissues originating from the same individual. The same is true for 32P-ADP-ribosylation of Rho proteins which is catalysed by Clostridium botulinum exoenzyme C3. Also the amount of Rho-GDI and ERK2 as well as the level of overall 32P-GTP binding acvitity was tumour-specific elevated, yet to a lower extent than Rho proteins. Although the amount of Rho proteins was enhance…

rac1 GTP-Binding Proteinrho GTP-Binding ProteinsCancer ResearchRHOAProliferation indexRHOBBlotting WesternDNA Mutational AnalysisRhoCGene ExpressionBreast NeoplasmsRAC1breast tumoursCDC42Polymerase Chain ReactionRho GTPasesRhoB GTP-Binding ProteinHumansBreastRNA Messengercdc42 GTP-Binding ProteinrhoB GTP-Binding Proteinmutation analysisADP Ribose TransferasesMitogen-Activated Protein Kinase 1biologyGenetics and GenomicsMolecular biologyOncologyCdc42 GTP-Binding ProteinMutationtumour progressionDisease Progressionbiology.proteinFemaleGuanosine TriphosphaterhoA GTP-Binding ProteinBritish Journal of Cancer
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Lovastatin causes sensitization of HeLa cells to ionizing radiation‐induced apoptosis by the abrogation of G2 blockage

2003

To investigate the effect of inhibition of Ras/Rho-regulated signalling by 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors (statins) on radiation-induced cell killing and apoptosis.Different human cell lines were pretreated or not with lovastatin before exposure to gamma-rays. Afterwards, radiation-induced cell killing, formation and repair of double-strand breaks, activation of radiation-inducible signal mechanisms (i.e. p53, p21, extracellular-signal-related kinase (ERK), NF-kappaB), changes in cell cycle progression and apoptosis were analysed.As shown by a colony formation assay, lovastatin sensitized HeLa cells to gamma-radiation-induced cell killing. The lovastati…

Cyclin-Dependent Kinase Inhibitor p21G2 PhaseMAPK/ERK pathwayApoptosisBiologyHeLaCyclinspolycyclic compoundsmedicineHumansRadiology Nuclear Medicine and imagingLovastatinSensitizationRadiological and Ultrasound TechnologyKinaseNF-kappa Bnutritional and metabolic diseasesCell cyclebiology.organism_classificationCell biologyCell killingmedicine.anatomical_structureGamma RaysApoptosislipids (amino acids peptides and proteins)LovastatinHydroxymethylglutaryl-CoA Reductase InhibitorsMitogen-Activated Protein KinasesTumor Suppressor Protein p53DNA DamageHeLa Cellsmedicine.drugInternational Journal of Radiation Biology
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Progression of breast tumors is accompanied by a decrease in expression of the Rho guanine exchange factor Tiam1

1994

In this study, we investigated the expression level of Ras-homologous (Rho) GTPases and the Rho guanine exchange factor (GEF) T-cell lymphoma invasion and metastasis 1 (Tiam1) in breast tumor specimens (n=106) by immunohistochemistry. Rho and Rho-GEF expression scores were compared to clinically established diagnostic and prognostic parameters. We found that RhoA and RhoB scores slightly increased with tumor grade, whereas the Rac1 score remained unaffected. The most significant effects were observed for the Rac1-specific GEF Tiam1. Tiam1 expression scores significantly decreased with the increase in tumor grade, tumor spreading and proliferation. Furthermore, Tiam1 expression was inversely…

Cancer ResearchRHOAbiologyRHOBEstrogen receptorGeneral Medicinemedicine.diseaseMetastasischemistry.chemical_compoundOncologychemistryPlasminogen activator inhibitor-1RhoB GTP-Binding ProteinImmunologymedicineCancer researchbiology.proteinGuanine nucleotide exchange factorPlasminogen activatorOncology Reports
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