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H2O2 effect on mouse embryonic fibroblasts +/- a deletion in the helicase domain of the Werner Syndrome gene homologue

ABSTRACT: [original Title] Expression profiling of mouse embryonic fibroblasts with or without a deletion in the helicase domain of the Werner Syndrome gene homologue treated with hydrogen peroxide Werner syndrome (WS) is a rare disorder characterized by the premature onset of a number of age-related diseases. The gene responsible for WS is believed to be involved in different aspects of transcription, replication, and/or DNA repair. In addition to genomic instability, WS cells exhibit oxidative stress. In this report, we have examined the impact of exogenous peroxide on the expression profile of mouse embryonic fibroblasts lacking part of the helicase domain of the WRN homologue. This expression profile was compared to hydrogen peroxide treated wild type mouse embryonic fibroblasts. Interestingly, untreated mouse embryonic fibroblasts with a deletion of the helicase domain of Wrn already exhibited down regulation of several biological processes decreased by hydrogen peroxide in wild type cells.

ORGANISM(S): Mus musculus

PROVIDER: GSE19007 | GEO | 2009/11/13

SECONDARY ACCESSION(S): PRJNA120445

REPOSITORIES: GEO

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Project description:Werner syndrome (WS) is a rare disorder characterized by the premature onset of a number of age-related diseases. The gene responsible for WS is believed to be involved in different aspects of transcription, replication, and/or DNA repair. We generated a mouse model with a deletion in the helicase domain of the murine WRN homologue that recapitulates most of the WS phenotypes including an abnormal hyaluronic acid excretion, higher reactive oxygen species (ROS) levels, increased genomic instability and cancer incidence resulting in a 10-15% decreased life span expectancy. In addition, WS patients and Wrn mutant mice show hallmarks of a metabolic syndrome including premature visceral obesity, hypertriglyceridemia, insulin-resistant diabetes type 2 and associated cardiovascular diseases. In this study, we compared the expression profile of liver tissues from 9 months old Wrn mutant treated with a standard diet supplemented with 0.04% resveratrol and wild type animals fed with standard diet only. Resveratrol is a calorie restriction mimetic. Gene set enrichment analysis of the microarray data indicated that reseveratrol-treated Wrn mutant mice exhibited down-regulation of genes normally decreased in several transgenic mouse models of hepatoma. In addition, resvratrol-treated Wrn mutant mice also exhibited a decrease in the expression of genes involved fatty acid metabolism and PPAR signaling pathways. Resvratrol-treated Wrn mutant mice also increased the expression of genes involved in steroid and cholesterol biosynthesis, xenobiotic metabolisms as well as inflammation. Finally, resveratrol improved insulin-resistance and the hyperglycemia but had no impact on dyslipidemia and mean life span of Wrn mutant mice. Microarray analyses were performed on the liver tissues of 9 months old mice. Four independent biological replicates of this experiment (wild type vs resveratrol treated Wrn helicase mutant mice) were carried out with a dye swap on two replicates of each genotype.

Project description:Werner syndrome (WS) is a rare disorder characterized by the premature onset of a number of age-related diseases. The gene responsible for WS is believed to be involved in different aspects of transcription, replication, and/or DNA repair. We generated a mouse model with a deletion in the helicase domain of the murine WRN homologue that recapitulates most of the WS phenotypes including an abnormal hyaluronic acid excretion, higher reactive oxygen species (ROS) levels, increased genomic instability and cancer incidence resulting in a 10-15% decreased life span expectancy. In addition, WS patients and Wrn mutant mice show hallmarks of a metabolic syndrome including premature visceral obesity, hypertriglyceridemia, insulin-resistant diabetes type 2 and associated cardiovascular diseases. In this study, we compared the expression profile of liver tissues from 9 months old Wrn mutant and wild type animals. Gene set enrichment analysis of the microarray data indicated that Wrn mutant mice exhibited down-regulation of genes normally decreased in several transgenic mouse models of hepatoma and during caloric restriction. Wrn mutant mice also altered the expression of genes involved in inflammation as well as in glutathione and xenobiotic metabolisms. These results indicate that Wrn mutant mice respond to the observed oxidative stress by altering the necessary pathways to survive. Vitamin C supplementation rescued the life span expectancy of Wrn mutant mice and reversed several age-related abnormalities in adipose, cardiac, and liver tissues, genomic integrity and inflammatory status. Finally, gene set enrichment analyses revealed that vitamin C decreased genes normally up regulated in human WS fibroblasts and cancers and it increased genes involved in tissue injury response and adipocyte dedifferentiation in obese mice. Experiment Overall Design: Microarray analyses were performed on the liver tissues of 9 months old mice. Four independent biological replicates of this experiment (wild type vs Wrn mutant or wild type vs vitamin C treated mutant mice) were carried out with a dye swap on two replicates of each genotype.

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H2O2 effect on mouse embryonic fibroblasts +/- a deletion in the helicase domain of the Werner Syndrome gene homologue

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