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Expression data from epididymal fat tissues of diet induced obese rats

ABSTRACT: Analysis of gene expression profiles of epididymal fat from DIO rats We applied a comparative functional genomics approach to evaluate diet-induced obese (DIO) rats as an obesity model Keywords: single time point, comparison control animal vs. diet induced obese animal

ORGANISM(S): Rattus norvegicus

PROVIDER: GSE8700 | GEO | 2007/08/07

SECONDARY ACCESSION(S): PRJNA101929

REPOSITORIES: GEO

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Project description:Analysis of gene expression profiles of epididymal fat from DIO rats; We applied a comparative functional genomics approach to evaluate diet-induced obese (DIO) rats as an obesity model Experiment Overall Design: Gene expression profiles from DIO and lean rats were generated and compared. A private colony of male Long-Evans rats was set up at Harlan (Harlan-Sprague Dawley, Indianapolis, IN). The animals had been on either a high fat/high sucrose diet (TD95217, Harlan Takled, Madison, WI) or a regular chow (Purina 5008; Ralston-Purina, St. Louis, MO) since weaning. Rats were shipped at 14-weeks of age to our facility and maintained on a 12:12-hour light-dark photoperiod (light on 10:00 PM). They were individually housed throughout the study at ambient temperature, and had free access to diets and water. After 2 weeks acclimation to the facility, body weight of the rats and weight of food consumed in the last 7 days were measured once a week. Body fat mass was analyzed by nuclear magnetic resonance (NMR) using an Echo Medical System (Houston, TX) instrument 3 times throughout the study. Fat free mass is the difference between body mass and fat mass. All animal studies were conducted in compliance with approved institutional animal care and use protocols according to NIH guidelines (NIH publication No. 86-23, 1985). OGTT was conducted after an overnight fasting when animals were 21 weeks of age. After a baseline blood collection (time 0), animals were dosed orally with 1.5 gram/kg glucose. Subsequence blood samples were collected at 30, 60, and 120 minutes post glucose challenge for the determination of plasma glucose and insulin levels. At 25 weeks of age, blood was collected by tail bleeding after overnight fasting. Rats were killed a week later at 09:00am by rapid decapitation. Trunk blood was collected and epididymal fat tissue excised. Various circulating metabolic parameters were measured under fasted (week 25) and fed conditions (week 26). Total RNA from rat epididymal fat was isolated with RNA STAT-60 (Tel-Test) according to the manufacturer's protocol. 5 micrograms of total RNA were labeled and hybridized to Affymetrix RAE230_2 arrays according to the Affymetrix protocol.

Project description:To profile the expression of circulating miRNAs in a mouse model of diet-induced obesity (DIO) with subsequent weight-reduction with low-fat diet (LFD), eighteen C57BL/6 male mice were grouped into three subgroups as: (1) Control: the mice fed with the standard AIN-76A (fat: 11.5 kcal%) diet for 12 wks; (2) DIO: the mice fed with 58 kcal% high-fat diet for 12 wks; (3) DIO+LFD: the mice fed with high-fat diet for 8 wks to induce obesity, then changed to 10.5 kcal% low-fat diet for subsequent 4 wks. C57BL/6 mice were purchased from BioLasco (Taipei, Taiwan). All housing conditions were maintained, and surgical procedures, including analgesia, were performed in an Association for Assessment and Accreditation of Laboratory Animal Care International (AAALAC)-accredited SPF facility according to national and institutional guidelines. In this experiment, eighteen C57BL/6 wild type male mice were randomly grouped into three subgroups (n=6 in each group): (1) Control: the control mice were fed ad libitum a standard AIN-76A (fat: 11.5 kcal%) diet for 12 wks; (2) DIO: the mice were fed ad libitum a 58 kcal% HFD (D12331; Research Diets Inc., New Brunswick, NJ) for 12 wks to induce obesity; (3) DIO+LFD: the mice fed ad libitum a 58 kcal% HFD (D12331) for 8 wks to induce obesity, then continued the feeding of 10.5 kcal% LFD (D 12329; Research Diets Inc.) for additional 4 wks. Weight measurements were performed on a weekly basis to for these three groups of mice. Evaluation of blood glucose levels was performed at the beginning and in the end of the experiment to confirm that the HFD-fed mice developed an obese and insulin resistant phenotype. After the end of experiment at 12w, all mice were killed. The abdominal WAT of each mice was removed and weighted. Paraffin-embedded abdominal WAT was sectioned at 5 M-NM-<m and stained with hematoxylin and eosin to measure mean adipocyte area. A volume of 1 mL of whole blood was collected into a plain tube and allowed to clot for 1 hour. The sera samples were aliquoted after centrifugation at 3,000 M-CM-^W g for 10 minutes and stored at M-bM-^HM-^R80M-BM-0C until further analysis.

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Expression data from epididymal fat tissues of diet induced obese rats

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