Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Late life rapamycin treatment reverses age-related heart dysfunction

ABSTRACT: We report the mRNA profile of aged mice (24 months old) fed either a control diet or a diet containing Rapamycin (14 ppm) for 3 months. After drug treatement, the hearts of the mice were removed and total mRNA was removed from the tissue. Analysis revealed that there were 700 significantly differentially expressed genes between the control fed group and the Rapamycin diet group by our analysis. Heart tissue samples from age-matched control mice (n=10) and rapamycin fed mice (n=10) were extracted for total RNA. The samples were sequenced using Illumina HiSeq 2000 (50 basepair paired-end sequencing). The sequencing yielded quality scores greater than 30 with an average of 10 million reads per sample. 34,293 genes were mapped back to the MGSCv37 C57BL/6J mouse genome (maximum paired distance=300 and minimum=130, minimum number of reads per mapping = 5, maximum number of mismatches= 2, with the reads being mapped to unique sites in the genome).

ORGANISM(S): Mus musculus

SUBMITTER: Simon Melov

PROVIDER: E-GEOD-48043 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Late-life rapamycin treatment reverses age-related heart dysfunction.

Flynn James M JM O'Leary Monique N MN Zambataro Christopher A CA Academia Emmeline C EC Presley Michael P MP Garrett Brittany J BJ Zykovich Artem A Mooney Sean D SD Strong Randy R Rosen Clifford J CJ Kapahi Pankaj P Nelson Michael D MD Kennedy Brian K BK Melov Simon S

Aging cell 20130707 5

Rapamycin has been shown to extend lifespan in numerous model organisms including mice, with the most dramatic longevity effects reported in females. However, little is known about the functional ramifications of this longevity-enhancing paradigm in mammalian tissues. We treated 24-month-old female C57BL/6J mice with rapamycin for 3 months and determined health outcomes via a variety of noninvasive measures of cardiovascular, skeletal, and metabolic health for individual mice. We determined that ...[more]

PMID: 23734717

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Project description:Beef represents a major diet component and one of the major sources of protein in human. The beef industry in the United States is currently undergoing changes and is facing increased demands especially for natural grass-fed beef. The grass-fed beef obtained their nutrients directly from pastures, which contained limited assimilable energy but abundant amount of fiber. On the contrary, the grain-fed steers received a grain-based regime that served as an efficient source of high-digestible energy. Lately, ruminant animals have been accused to be a substantial contributor for the green house effect. Therefore, the concerns from environmentalism, animal welfare and public health have driven consumers to choose grass-fed beef. Rumen is one of the key workshops to digest forage constituting a critical step to supply enough nutrients for animals’ growth and production. We hypothesize that rumen may function differently in grass- and grain-fed regimes. The objective of this study was to find the differentially expressed genes in the ruminal wall of grass-fed and grain-fed steers, and then explore the potential biopathways. In this study, the RNA Sequencing (RNA-Seq) method was used to measure the gene expression level in the ruminal wall. The total number of reads per sample ranged from 24,697,373 to 36,714,704. The analysis detected 342 differentially expressed genes between ruminal wall samples of animals raised under different regimens. The Fisher’s exact test performed in the Ingenuity Pathway Analysis (IPA) software found 16 significant molecular networks. Additionally, 13 significantly enriched pathways were identified, most of which were related to cell development and biosynthesis. Our analysis demonstrated that most of the pathways enriched with the differentially expressed genes were related to cell development and biosynthesis. Our results provided valuable insights into the molecular mechanisms resulting in the phenotype difference between grass-fed and grain-fed cattle. Ruminal wall samples from two randomly chosen animals per group were obtained, totaling four samples. The animals were born, raised and maintained at the Wye Angus farm. This herd, which has been closed for almost 75 years and yielded genetically similar progenies, constitutes an excellent resource to perform transcriptomic analysis. The genetic resemblance among individuals permits us to better control the cause of variation between experimental clusters and individuals. The randomly chosen pairs of animals were part of larger sets of steers that received a particular treatment. All animals received the same diet until weaning. The grain group received conventional diet consisting of corn silage, shelled corn, soy bean and trace minerals. The grass fed steers consumed normally grazed alfalfa; during wintertime, bailage was utilized. The alfalfa has been harvested from land without any fertilizers, pesticides or other chemicals. The steers ate no animal, agricultural or industrial byproducts and never receive any type of grain. Then, the calves were randomly assigned to one diet and exclusively received that regimen until termination. Grain–fed animals reached the market weight around the age of 14 month-old, however, grass-fed steers required approximately 200 additional days to achieve the same weight. Immediately after termination at the Old Line Custom Meat Company (Baltimore, MD) a small piece of ruminal wall was excised, cleaned and preserved at -80°C for posterior processing.

Dataset Information

Late life rapamycin treatment reverses age-related heart dysfunction

Publications

Late-life rapamycin treatment reverses age-related heart dysfunction.

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