Dietary interventions modulate global non-coding RNA expression: a role for microRNA-chromatin-mRNA crosstalk [Diet_miRNA]
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE87513 | GEO | 2017/12/13
SECONDARY ACCESSION(S): PRJNA344978
REPOSITORIES: GEO
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Project description:Using high-throughput deep sequencing, both coding and long non-coding RNA expression was profiled across six dietary intervention groups, including low fat (LF) or high fat (HF) with or without calorie restriction (LF+CR, HF+CR) or exercise (LF+Ex, HF+Ex).
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Project description:Dietary interventions are effective ways to extend or shorten lifespan. By examining midlife hepatic gene expressions in mice under different dietary conditions, which resulted in different lifespans and aging-related phenotypes, we were able to identify genes and pathways that modulate the aging process. We found that pathways transcriptionally correlated with diet-modulated lifespan and physiological changes were enriched for lifespan-modifying genes. Male C57BL/6J mice at 4 weeks of age were purchased from Shanghai Animal Co, Ltd. Mice were maintained under a 12-hour dark/light cycle (lights on at 6:30 am) at a temperature of 22 ± 3 °C in accredited animal facilities. Prior to the start of experiment, mice were maintained on a low-fat diet (Research Diets Inc., New Brunswick, NJ) for one week. At the age of 5 weeks, animals were randomly assigned to one of the 6 intervention groups (n = 30 for each group): feeding of a low-fat diet (10% fat, D12450B, Research Diets) ad libitum (LF) or with 30% calorie restriction (LF+CR) or with voluntary running exercise (LF+Ex), feeding of a high-fat diet (60% fat, D12492, Research Diets) ad libitum (HF) or with 30% calorie restriction (HF+CR) or with voluntary running exercise (HF+Ex). All mice were housed individually during the study. The daily consumption of food in LF and HF groups was recorded over a week and averaged to determine the amount of food for the following week for the LF+CR and HF+CR groups, respectively. After 1 week acclimation in cage with the locked running wheels, mice in the LF+Ex and HF+Ex groups were allowed free access to a running wheel, and the running distance and time were recorded automatically by the equipment. The hepatic transcriptional level for 3 mice from each intervention group at 62 weeks of age was analyzed using Affymetrix Mouse Genome 430 2.0 Arrays.
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Project description:We studied the effect of dietary fat type, varying in polyunsaturated/saturated fatty acid ratio's (P/S) on development of metabolic syndrome. C57Bl/6J mice were fed purified high-fat diets (45E% fat) containing palm oil (HF-PO; P/S 0.4), olive oil (HF-OO; P/S 1.1) or safflower oil (HF-SO; P/S 7.8) for 8 weeks. A low-fat palm oil diet (LF-PO; 10E% fat) was used as a reference. Additionally, we analyzed diet-induced changes in gut microbiota composition and mucosal gene expression. The HF-PO diet induced a higher body weight gain and liver triglyceride content compared to the HF-OO, HF-SO or LF-PO diet. In the intestine, the HF-PO diet reduced microbial diversity and increased the Firmicutes/Bacteroidetes ratio. Although this fits a typical obesity profile, our data clearly indicate that an overflow of the HF-PO diet to the distal intestine, rather than obesity itself, is the main trigger for these gut microbiota changes. A HF-PO diet-induced elevation of lipid metabolism-related genes in the distal small intestine confirmed the overflow of palm oil to the distal intestine. Some of these lipid metabolism-related genes were previously already associated with the metabolic syndrome. In conclusion, our data indicate that saturated fat (HF-PO) has a more stimulatory effect on weight gain and hepatic lipid accumulation than unsaturated fat (HF-OO and HF-SO). The overflow of fat to the distal intestine on the HF-PO diet induced changes in gut microbiota composition and mucosal gene expression. We speculate that both are directly or indirectly contributive to the saturated fat-induced development of obesity and hepatic steatosis. Keywords: Diet intervention study
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