SM019 - Infection with SARS MA15 of C57BL/6J mice and Tnfrsf1b knockout mice
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE40824 | GEO | 2012/09/13
SECONDARY ACCESSION(S): PRJNA175045
REPOSITORIES: GEO
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Project description:Comparing the host response of C57BL/6J mice to Tnfrsf1b knockouts in the same strain of mice. Groups of 10-week-old C57BL/6 mice or Tnfrsf1a/1b knockout mice were infected with SARS MA15 at a dose of 10^5 PFU or mock infected. Mice were euthanized on days 4 and 7 post-infection to measure virus load and isolate samples for measurement of virus load, lung pathology, transcriptional analysis and proteomics analysis. Mock-infected animals were also harvested at each time point. Mice were weighed every 24 hours to measure general disease progression and any mouse approaching 30% weight loss was euthanized.
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Project description:Defects in homocysteine and folate metabolism are associated with increased risks for neural tube and congenital heart defects, cardiovascular disease and stroke, cancers, and neurodegeneration. In many but not all cases, dietary supplementation with folate significantly reduces the severity and incidence of these conditions. Common polymorphisms modulate these metabolic pathways and disease risks, but do not fully account for the particular birth defects and adult diseases that occur in at-risk individuals. To test whether other pathways contribute to disease pathogenesis, we analyzed global and pathway-specific changes in gene expression and levels of selected metabolites after depletion and repletion of dietary folate in two genetically distinct inbred strains of mice. Compared to the C57BL/6J strain, A/J showed greater homeostatic response to folate perturbation by retaining a higher serum folate level and minimizing global gene expression changes. Remarkably, folate perturbation led to systematic strain-specific differences only in the expression profile of the cholesterol biosynthesis pathway and translated to changes in levels of serum and liver total cholesterol. By genetically increasing serum and liver total cholesterol levels in APOE deficient mice, we modestly but significantly improved folate retention during folate depletion, suggesting an interplay between homocysteine and folate metabolism and cholesterol metabolism. Absence of measurable changes in global methylation patterns or amelioration of effects with supplementation with an alternative methyl donor suggest that dietary folate perturbations do not act through large-scale or general changes in methylation. These results suggest that homeostatic responses in cholesterol metabolism contribute to the beneficial effects of dietary folate supplementation. Keywords: time course, stress response, diet, genetic, homeostasis Six-week old female C57BL/6J and B6.129P2-Apoetm1Unc/J (Piedrahita et al. 1992) mice were purchased from the Jackson Laboratory. All mice were raised on a control diet containing four ppm folic acid (Basal Diet 5755, TestDiet) for one week before the start of studies. Mice were then placed on folic acid deficient diet (58C3, TestDiet) containing 1% succinylsulfathiazole, a non-absorbable antibiotic commonly used to suppress folate production by bacteria in the intestine, for 14 days. A subset of these mice were placed back on control diet for 7 days after 14 day depletion. There were three groups of mice that underwent folic acid depletion and repletion. ApoE knockout mice on C57BL/6J background, C57BL/6J mice supplemented with 25mM choline and 50mM saccharine in drinking water, and C57BL/6J mice supplemented with 50mM saccharine. Saccharine was used to reduce the bitter taste of choline in the drinking water. We also had C57BL/6J mice on the control diet for 14 days and 21 days. These mice served as controls for treated mice from each time point during hybridization. The folate level in the control diet for this study was significantly lower than the previous study (GSE9242) due to greater loss of folic acid by irradiation of the diet. There were eight replicate mice per treatment group per folic acid perturbation protocol. An equal amount (by weight) of liver tissue from eight replicate mice was separated into two pools of four replicate tissues each. Pooled RNA from treated mice and pooled RNA from control mice for each time point were aminoallyl labeled with Cy3 and Cy5 in duplicate with reversing of dyes.
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