Search results for "DNA repair"

showing 5 items of 295 documents

Mouse CSB protein is important for gene expression in the presence of a single-strand break in the non-transcribed DNA strand.

2010

CSB protein is required for strand-specific repair of bulky DNA lesions in transcribed genes and mediates transcription recovery after exposure to DNA-damaging agents. We enzymatically generated DNA single-strand breaks (SSBs) with 3'-OH and 5'-phosphate termini in defined positions of a plasmid-borne gene and measured their effect on transcription in cell lines with different statuses of the Csb gene. A single SSB in the transcribed region of the gene caused significant decrease of gene expression. In all tested cell lines of mouse and human origin, a SSB in the transcribed DNA strand was less harmful for gene expression than a SSB situated in the opposing DNA strand. CSB deficiency exhibi…

musculoskeletal diseasesBase SequenceDNA damageDNA Single-StrandedGene ExpressionCell BiologyBiologyBiochemistryMolecular biologychemistry.chemical_compoundMiceDNA Repair EnzymeschemistryTranscription (biology)Cell cultureCoding strandGene expressionAnimalsPoly-ADP-Ribose Binding ProteinsMolecular BiologyGeneDNATranscription bubbleDNA DamageDNA PrimersDNA repair
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A global DNA repair mechanism involving the Cockayne syndrome B (CSB) gene product can prevent the in vivo accumulation of endogenous oxidative DNA b…

2002

The Cockayne syndrome B (CSB) gene product is involved in the repair of various types of base modifications in actively transcribed DNA sequences. To investigate its significance for the repair of endogenous oxidative DNA damage, homozygous csb(-/-)/ogg1(-/-) double knockout mice were generated. These combine the deficiency of CSB with that of OGG1, a gene coding for the mammalian repair glycosylase that initiates the base excision repair of 7,8-dihydro-8-oxoguanine (8-oxoG). Compared to ogg1(-/-) mice, csb(-/-)/ogg1(-/-) mice were found to accumulate with age severalfold higher levels of oxidited purine modifications in hepatocytes, splenocytes and kidney cells. In contrast, the basal (ste…

musculoskeletal diseasescongenital hereditary and neonatal diseases and abnormalitiesCancer ResearchDNA RepairTranscription GeneticDNA damageDNA repairBiologyGene productMicechemistry.chemical_compoundGeneticsAnimalsPoly-ADP-Ribose Binding ProteinsMolecular BiologyGeneDNA PrimersMice KnockoutBase SequenceHomozygoteDNA HelicasesDeoxyguanosinenutritional and metabolic diseasesBase excision repairMolecular biologyOxidative StressDNA Repair EnzymesBiochemistrychemistry8-Hydroxy-2'-DeoxyguanosineDNA glycosylaseDNADNA DamageNucleotide excision repairOncogene
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Influence of aryl hydrocarbon- (Ah) receptor and genotoxins on DNA repair gene expression and cell survival of mouse hepatoma cells

2009

The aryl hydrocarbon receptor (AhR) mediates toxicity of a variety of environmental pollutants such as polycyclic aromatic hydrocarbons (PAHs) and dioxins. However, the underlying mechanisms and genetic programmes regulated by AhR to cause adverse effects but also to counteract poisoning are still poorly understood. Here we analysed the effects of two AhR ligands, benzo[a]pyrene (B[a]P), a DNA damaging tumour initiator and promotor and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), a pure tumour promoter, on cell survival and on nucleotide excision repair (NER) gene expression. NER deals with so called "bulky" DNA adducts including those generated by enzymatically activated B[a]P. Therefore, t…

p53Aryl hydrocarbon receptor nuclear translocatorDNA RepairTumor suppressor geneCell SurvivalDNA damageDNA repairBlotting WesternDNA-Directed DNA Polymerasecis-PlatinBiologyToxicologyMiceLiver Neoplasms ExperimentalCell Line TumorGene expressionAnimals2378-Tetrachlorodibenzo-p-dioxinGeneAryl hydrocarbon receptorGene Expression ProfilingAryl Hydrocarbon Receptor Nuclear TranslocatorGenes p53Aryl hydrocarbon receptorMolecular biologyNucleotide excision repairBenzo[a]pyreneGene Expression RegulationReceptors Aryl HydrocarbonBiochemistrybiology.proteinEnvironmental PollutantsMutagensNucleotide excision repairToxicology
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Late Activation of Stress-activated Protein Kinases/c-Jun N-terminal Kinases Triggered by Cisplatin-induced DNA Damage in Repair-defective Cells

2011

Although stress-activated protein kinases/c-Jun N-terminal kinases (SAPK/JNK) are rapidly activated by genotoxins, the role of DNA damage in this response is not well defined. Here we show that the SEK1/MKK4-mediated dual phosphorylation of SAPK/JNK (Thr-183/Tyr-185) correlates with the level of cisplatin-DNA adducts at late times (16–24 h) after drug treatment in both human and mouse cells. Transfection of platinated plasmid DNA also caused SAPK/JNK activation. A defect in transcription-coupled nucleotide excision repair resting on a mutation in Cockayne syndrome group B protein promoted the late SAPK/JNK activation following cisplatin exposure. Signaling to SAPK/JNK was accompanied by act…

rho GTP-Binding ProteinsDNA RepairMAP Kinase Kinase 4DNA repairDNA damageDNA damage response; DNA repair; cisplatin-DNA adducts; SAPK/JNKp38 mitogen-activated protein kinasesAntineoplastic AgentsCell Cycle ProteinsAtaxia Telangiectasia Mutated ProteinsProtein Serine-Threonine KinasesDNA and ChromosomesBiologyBiochemistryAtaxia Telangiectasia Mutated ProteinsDNA AdductsMiceRadiation IonizingAnimalsHumansDNA Breaks Double-StrandedMolecular BiologyReplication protein ACells CulturedMice KnockoutKinaseTumor Suppressor ProteinsJNK Mitogen-Activated Protein KinasesCell BiologyMolecular biologyDNA-Binding ProteinsEnzyme Activationc-Jun N-terminal kinasesbiology.proteinCisplatinSignal TransductionNucleotide excision repairJournal of Biological Chemistry
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MutSa expression predicts a lower disease-free survival in malignant salivary gland tumors:an immunohistochemical study

2021

Appropriate DNA replication is vital to maintain cell integrity at the genomic level. Malfunction on DNA repair mechanisms can have implications related to tumor behavior. Our aim was to evaluate the expression of key complexes of the DNA mismatch-repair system MutS? (hMSH2-hMSH6) and MutS? (hMSH2-hMSH3) in a panel comprising the most common benign and malignant salivary gland tumors (SGT), and to determine their association with disease-free survival. Ten cases of normal salivary gland (NSG) and 92 of SGT (54 benign and 38 malignant) were retrieved. Immunohistochemistry was performed for hMSH2, hMSH3, hMSH6. Scanned slides were digitally analyzed based on the percentage of positive cells w…

sheepDNA Repairmetallic implantsbone-to-implant contactosseointegrationSalivary Gland NeoplasmsImmunohistochemistryDisease-Free SurvivalMutS Homolog 2 ProteinOtorhinolaryngologylow density bonesgrowth hormoneHumansSurgeryGeneral DentistryUNESCO:CIENCIAS MÉDICAS
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