Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Comparison of the long-term effects of calorie restriction without malnutrition on global gene expression profiles of rat and human skeletal muscle [Rat]

ABSTRACT: With the population of older and overweight individuals on the rise in the Western world, there is an ever greater need to slow the aging processes and reduce the burden of age-associated chronic disease that would significantly improve the quality of human life and reduce economic costs. Caloric restriction (CR), is the most robust and reproducible intervention known to delay aging and to improve healthspan and lifespan across species (1); however, whether this intervention can extend lifespan in humans is still unknown. Here we report that rats and humans exhibit similar responses to long-term CR at both the physiological and molecular levels. CR induced broad phenotypic similarities in both species such as reduced body weight, reduced fat mass and increased the ratio of muscle to fat. Likewise, CR evoked similar species-independent responses in the transcriptional profiles of skeletal muscle. This common signature consisted of three key pathways typically associated with improved health and survival: IGF-1/insulin signaling, mitochondrial biogenesis and inflammation. To our knowledge, these are the first results to demonstrate that long-term CR induces a similar transcriptional profile in two very divergent species, suggesting that such similarities may also translate to lifespan-extending effects in humans as is known to occur in rodents. These findings provide insight into the shared molecular mechanisms elicited by CR and highlight promising pathways for therapeutic targets to combat age-related diseases and promote longevity in humans. Male Fisher 344 rats (n=54) were randomly assigned to two groups at 2 months of age. One group was kept ad libitum (AL) fed throughout their lifespan while the calorie restriction (CR) group was progressively brought down to a 40% CR. All animals were fed a NIH-31 standard chow (Harlan Teklad, Indianapolis, IN, USA). Rats were singly housed in an environmentally controlled vivarium with unlimited access to water and a controlled photoperiod (12 hr. light;12 hr. dark). Body weights and food intake were recorded biweekly. All rats were maintained between 68-72M-BM-0F according to animal protocols and NIH guidelines. Total RNA was extracted from the vastus lateralis skeletal muscle using Trizol Reagent (Invitrogen, Carlsbad, CA) following the manufacturerM-bM-^@M-^Ys instructions, n=5 from each group. Total RNA samples were biotin labeled and hybridized to RatRef-12 v1 Gene Expression beadchips (Illumina, San Diego, CA) following Illumina protocols. Arrays were washed and scanned using an Illumina BeadArray 500GX reader. Microarray florescent signals were extracted using the Illumina GenomeStudio Gene Expression software(v1.6.0) and any spots at or below the background were filtered using an Illumina detection p-value of 0.02 and above. The natural log of all remaining scores were used to find the avg and std of each array and the z-score normalization was calculated . Correlation analysis, sample clustering analysis and principal component analysis include all of probes are performed to identify/exclude any possible outliners. The resulting dataset was next analyzed with DIANE 6.0, a spreadsheet based microarray analysis program. Gene set enrichment analysis use gene expression values or gene expression change values for all of the genes in the microarray. Parametric analysis of gene set enrichment (PAGE) was used [pubmed 20682848] for gene set analysis. Gene Sets include the MSIG database [Link], Gene Ontology Database [Link], GAD human disease and mouse phenotype gene sets [pubmed: 20092628] were used to explore functional level changes.

ORGANISM(S): Rattus norvegicus

SUBMITTER: Kevin Becker

PROVIDER: E-GEOD-38062 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Calorie restriction in humans inhibits the PI3K/AKT pathway and induces a younger transcription profile.

Mercken Evi M EM Crosby Seth D SD Lamming Dudley W DW JeBailey Lellean L Krzysik-Walker Susan S Villareal Dennis T DT Capri Miriam M Franceschi Claudio C Zhang Yongqing Y Becker Kevin K Sabatini David M DM de Cabo Rafael R de Cabo Rafael R Fontana Luigi L

Aging cell 20130605 4

Caloric restriction (CR) and down-regulation of the insulin/IGF pathway are the most robust interventions known to increase longevity in lower organisms. However, little is known about the molecular adaptations induced by CR in humans. Here, we report that long-term CR in humans inhibits the IGF-1/insulin pathway in skeletal muscle, a key metabolic tissue. We also demonstrate that CR induces dramatic changes of the skeletal muscle transcriptional profile that resemble those of younger individual ...[more]

PMID: 23601134

Similar Datasets

Project description:Caloric restriction (CR) without malnutrition is one of the most consistent strategies for increasing mean and maximal lifespan and delaying the onset of age-associated diseases. Stress resistance is a common trait of many long-lived mutants and life-extending interventions, including CR. Indeed, better protection against heat shock and other genotoxic insults have helped explain the pro-survival properties of CR. In this study, both in vitro and in vivo responses to heat shock were investigated using two different models of CR. Murine B16F10 melanoma cells treated with serum from CR-fed rats showed lower proliferation, increased tolerance to heat shock and enhanced HSP-70 expression, compared to serum from ad libitum-fed animals. Similar effects were observed in B16F10 cells implanted subcutaneously in male C57BL/6 mice subjected to CR. Microarray analysis identified a number of genes and pathways whose expression profile were similar in both models. These results suggest that the use of an in vitro model could be a good alternative to study the mechanisms by which CR exerts its anti-tumorigenic effects. KEY WORDS: caloric restriction, heat shock, stress response, tumorigenesis, aging In Vivo: Male C57BL/6 mice (3 month old) were single-housed in duplex caging in a room maintained at a constant temperature (20-22 °C) and humidity (30-70%) in a light:dark 12:12-h schedule, according to established animal protocols and NIH guidelines. They were fed either a standard purified mouse diet (NIH-31) ad libitum (AL; n=10) or maintained on a 40% calorie restriction regimen (CR; n=10) for the six week study. B16F10 melanoma cells (ATCC® CRL-6475™) were purchased from American Type Culture Collection (Manassas, VA); they were cultured in Dulbecco's Modified Essential Medium (DMEM) supplemented with 10% fetal bovine serum and penicillin/streptomycin (Gibco, Gaithersburg, MD) under standard cell culture conditions. One month into the study, 5 mice from each diet group were injected with 1x106 B16F10 melanoma cells in the periscapular region. Fourteen days later, animals were euthanized and tumors were excised and frozen for RNA isolation. In Vitro: B16F10 melanoma cells were incubated in media with 10% serum from either AL- or CR-fed rats, serum was obtained from overnight fasted, anesthetized 6-month-old male Fisher 344 rats. Cells were grown for 96 hours before being harvested, washed and collected for RNA isolation. The RNA was extracted using the RNeasy Mini Kit from Qiagen using standard protocols and labeled with Biotin using the standard Illumina protocol. Samples were hybed overnight to Illumina's Sentrix MouseRef-8 v1.1 Expression BeadChips. Arrays were washed, stained with Cy-3 and scanned at 0.8 micron resolution in a 500 GX Illumina Bead Array Reader.

Project description:With the population of older and overweight individuals on the rise in the Western world, there is an ever greater need to slow the aging processes and reduce the burden of age-associated chronic disease that would significantly improve the quality of human life and reduce economic costs. Caloric restriction (CR), is the most robust and reproducible intervention known to delay aging and to improve healthspan and lifespan across species (1); however, whether this intervention can extend lifespan in humans is still unknown. Here we report that rats and humans exhibit similar responses to long-term CR at both the physiological and molecular levels. CR induced broad phenotypic similarities in both species such as reduced body weight, reduced fat mass and increased the ratio of muscle to fat. Likewise, CR evoked similar species-independent responses in the transcriptional profiles of skeletal muscle. This common signature consisted of three key pathways typically associated with improved health and survival: IGF-1/insulin signaling, mitochondrial biogenesis and inflammation. To our knowledge, these are the first results to demonstrate that long-term CR induces a similar transcriptional profile in two very divergent species, suggesting that such similarities may also translate to lifespan-extending effects in humans as is known to occur in rodents. These findings provide insight into the shared molecular mechanisms elicited by CR and highlight promising pathways for therapeutic targets to combat age-related diseases and promote longevity in humans. Percutaneous biopsy specimens of vastus lateralis muscle were taken from 15 Human subjects from a group of middle-aged (58.7±7.4 yrs.), weight-stable members of the Calorie Restriction Society who have been practicing ~30% CR with adequate nutrition (at least 100% of RDI for each nutrient) for an average of 9.6 years and 10 age matched controls that were eating a typical Western diet. Total RNA was extracted from the skeletal muscle using Trizol Reagent (Invitrogen, Carlsbad, CA) following the manufacturer’s instructions, RNA quality and quantity was checked using an Agilent 2100 Bio-analyzer and the RNA 6000 nano-chips (Agilent Technologies, Palo Alto, CA). Total RNA samples were biotin labeled and hybridized to Sentrix Human HT-12, v3 Expression BeadChips (Illumina, San Diego, CA), following Illumina protocols. Arrays were washed, stained and scanned using an Illumina BeadArray 500GX reader. Microarray florescent signals were extracted using the Illumina GenomeStudio Gene Expression software(v1.6.0) and any spots at or below the background were filtered using an Illumina detection p-value of 0.02 and above. The natural log of all remaining scores were used to find the avg and std of each array and the z-score normalization was calculated . Correlation analysis, sample clustering analysis and principal component analysis include all of probes are performed to identify/exclude any possible outliners. The resulting dataset was next analyzed with DIANE 6.0, a spreadsheet based microarray analysis program. Gene set enrichment analysis use gene expression values or gene expression change values for all of the genes in the microarray. Parametric analysis of gene set enrichment (PAGE) was used [pubmed 20682848] for gene set analysis.

Project description:Astrocytes are key cells in brain aging, helping neurons to undertake healthy aging or otherwise letting them enter into a spiral of neurodegeneration. We aimed to characterize astrocytes cultured from senescence-accelerated prone 8 (SAMP8) mice, a mouse model of brain pathological aging, along with the effects of caloric restriction, the most effective rejuvenating treatment known so far. Analysis of the transcriptomic profiles of SAMP8 astrocytes cultured in control conditions and treated with caloric restriction serum was performed using mRNA microarrays. A decrease in mitochondrial and ribosome mRNA, which was restored by caloric restriction, confirmed the age-related profile of SAMP8 astrocytes and the benefits of caloric restriction. An amelioration of antioxidant and neurodegeneration-related path- ways confirmed the brain benefits of caloric restriction. Studies of oxidative stress and mitochondrial function demonstrated a reduction of oxidative damage and partial improvement of mito- chondria after caloric restriction. In summary, caloric restriction showed a significant tendency to normalize pathologically aged astrocytes through the activation of pathways that are protective against the age-related deterioration of brain physiology. Key words: astrocytes; caloric restriction; mitochondria; oxidative stress; RNA microarrays; SAMP8. Primary cultures enriched in astrocytes were obtained from cerebral cortical tissue from 2-day-old SAMP8 and SAMR1 mice. Astrocyte cultures were established and experiments were routinely carried out after 21 days in culture. Established astrocyte cultures of both SAMR1 and SAMP8 consisted of 85-90% astrocytes, 10-15% microglia and 0.1-1% oligodendroglia. Sera from rats subjected to ad libitum (AL) diet and to CR were obtained as described for the establishment of the CR in vitro model (de Cabo et al., 2003). Serum was heat inactivated at 56°C prior to use in astrocyte culture experiments. Treatment in vitro was performed by adding 10% volume CR or AL serum onto the astrocyte culture medium for 48 h, the cells were harvested and RNA was extracted for the microarray studies. Three biological replicates for each condition were done and RNA was extracted for the microarray studies. Please note that SAM models were developed from AKR/J by Kyoto University. Five litters with severe senescence were selected to further propagate and examine these characteristics. Litters that showed normal aging were selected as a senescence-resistant series (R-series). The genetic background of the SAM mice became suspect after the pathological findings were different from the AKR/J mouse. Each SAM model is genetically different. Each SAM colony was acquired by Harlan by Takeda Chemical Ltd. in 2002. And here is the link to the company site. http://www.harlan.com/products_and_services/research_models_and_services/research_models/sam_inbred_mice/samp8tahsd.hl

Project description:Increased expression of SIRT1 extends the lifespan of lower organisms and delays the onset of age-related diseases in mammals. Here, we show that SRT2104, a synthetic small molecule activator of SIRT1, extends both mean and maximal lifespan of mice fed a standard diet. This is accompanied by improvements in health, including enhanced motor coordination, performance, bone mineral density and insulin sensitivity associated with higher mitochondrial content and decreased inflammation. Short-term SRT2104 treatment preserves bone and muscle mass in an experimental model of atrophy. These results demonstrate it is possible to design a small molecule that can slow aging and delay multiple age-related diseases in mammals, supporting the therapeutic potential of SIRT1 activators in humans. Key words: Sirtuins, lifespan, healthspan, osteoporosis, muscle wasting, inflammation Groups of 28 week old male C57BL6/J mice were maintained for the rest of their lives or until sacrifice on either an ad libitum AIN-93G SD diet, an ad libitum AIN-93G diet supplemented with SRT2104 or a caloric restricted AIN-93G diet consisting of 60% of what the ad lib animals ate. SRT2104 was added at a dose of 1.33 g drug per kg of chow, formulated to provide daily doses of approximately 100 mg drug per kg bodyweight to the mice. 5 mice from each group were selected after 41 weeks and RNA was extracted from both muscle and liver tissue using 1.0mm glass beads in a Precellys 24 Tissue Homogenizer and Qiagen RNeasy Mini Kits for Fibrous Tissue according to manufacturer's specifications. Quality and quantity of the total RNA was checked with the Agilent 2100 bioanalyzer using RNA 6000 Nano chips. RNA samples were labeled using the Illumina TotalPrep RNA Amplification Kit. In short, 0.5ug of total RNA was first converted into single-stranded cDNA with reverse transcriptase using an oligo-dT primer containing the T7 RNA polymerase promoter site and then copied to produce double-stranded cDNA molecules. The double stranded cDNA was cleaned and concentrated with the supplied columns and used in an overnight in-vitro transcription reaction where single-stranded RNA (cRNA) was generated and labeled by incorporation of biotin-16-UTP. Arrays were hybridized using a total of 0.75ug of biotin-labeled cRNA at 58 degrees C for 16 hours to Illumina's Sentrix MouseRef-8 v2 Expression BeadChips. Each BeadChip has ~24,000 well-annotated RefSeq transcripts with approximately 30-fold redundancy. The arrays were washed, blocked and the biotin labeled cRNA was detected by staining with streptavidin-Cy3. Arrays were scanned at a resolution of 0.8um using the Beadstation 500 X from Illumina and the data was extracted using the Illumina GenomeStudio software(v1.6.0). Any spots at or below the background were filtered out using an Illumina detection p value of 0.02 and above. The natural log of all remaining scores were used to find the avg and std of each array and the z-score normalization was calculated and presented below. Z-score = (raw value - avg)/std.

Project description:The prevention or delay of the onset of age-related diseases prolongs survival and improves quality of life while reducing the burden on the health care system. Activation of sirtuin 1 (SIRT1), an NAD+ deacetylase, improves metabolism and confers protection against physiological and cognitive disturbances in old age. SRT1720 is a specific SIRT1 activator that has health and lifespan benefits in adult mice fed a highfat diet. We found extension in lifespan, delayed onset of age-related metabolic diseases, and improved general health in mice fed a standard diet after SRT1720 supplementation. Inhibition of pro-inflammatory gene expression both in the liver and muscle of SRT1720-treated animals was noted. SRT1720 lowered phosphorylation of NF-κB pathway regulators in vitro only when SIRT1 was functionally present. Combined with our previous work, the current study further supports the beneficial effects of SRT1720 on health across the lifespan in mice. Groups of 28 week old male C57BL/6J mice were maintained on ad libitum AIN-93G SD diet, or an ad libitum AIN-93G diet supplemented with SRT1720 for the rest of their lives. SRT1720 was added at a dose of 1.33 g drug per kg of chow, formulated to provide daily doses of approximately 100 mg drug per kg bodyweight to the mice. 5 mice from each group were selected and RNA was extracted from both muscle and liver tissue using 1.0mm glass beads in a Precellys 24 Tissue Homogenizer and Qiagen RNeasy Mini Kits for Fibrous Tissue according to manufacturer's specifications. Quality and quantity of the total RNA was checked with the Agilent 2100 bioanalyzer using RNA 6000 Nano chips. RNA samples were labeled using the Illumina TotalPrep RNA Amplification Kit. In short, 0.5ug of total RNA was first converted into single-stranded cDNA with reverse transcriptase using an oligo-dT primer containing the T7 RNA polymerase promoter site and then copied to produce double-stranded cDNA molecules. The double stranded cDNA was cleaned and concentrated with the supplied columns and used in an overnight in-vitro transcription reaction where single-stranded RNA (cRNA) was generated and labeled by incorporation of biotin-16-UTP. Arrays were hybridized using a total of 0.75ug of biotin-labeled cRNA at 58 degrees C for 16 hours to Illumina's Sentrix MouseRef-8 v2 Expression BeadChips. Each BeadChip has ~24,000 well-annotated RefSeq transcripts with approximately 30-fold redundancy. The arrays were washed, blocked and the biotin labeled cRNA was detected by staining with streptavidin-Cy3. Arrays were scanned at a resolution of 0.8um using the Beadstation 500 X from Illumina and the data was extracted using the Illumina GenomeStudio software(v1.6.0). Any spots at or below the background were filtered out using an Illumina detection p value of 0.02 and above. The natural log of all remaining scores were used to find the avg and std of each array and the z-score normalization was calculated and presented below. Z-score = (raw value - avg)/std.

Project description:Metformin, a commonly used drug prescribed to treat type-2 diabetes, has been found to extend health span and delay cancer incidence and progression. Here, we report that starting chronic treatment with low dose of metformin (0.1% w/w in diet) at one year of age extends health and lifespan in male mice, while a higher dose (1% w/w) was toxic. Treatment with low dose metformin mimicked some of the benefits of calorie restriction, such as improved physical performance, increased insulin sensitivity, and reduced LDL and cholesterol levels. At a molecular level, metformin increased AMP-activated protein kinase activity without attenuation of the mitochondrial electron transport chain activities. Metformin treatment resulted in lower chronic inflammation and increased antioxidant protection, suggesting that the ability of metformin to improve health of laboratory animals may stem from these factors. Our results support that metformin supplementation could be beneficial in extending health and lifespan in humans. Groups of one-year old male B6C57/J mice were maintained on ad libitum AIN-93G SD diet, or a 40% caloric restriction of the AIN-93G SD diet, or an ad libitum AIN-93G diet supplemented with 0.1% w/w metformin for the rest of their lives. 5 mice from each of these 3 groups were selected and RNA was extracted from both muscle and liver tissue using 1.0mm glass beads in a Precellys 24 Tissue Homogenizer and Qiagen RNeasy Mini Kits for Fibrous Tissue according to manufacturer's specifications. Quality and quantity of the total RNA was checked with the Agilent 2100 bioanalyzer using RNA 6000 Nano chips. RNA samples were labeled using the Illumina TotalPrep RNA Amplification Kit. In short, 0.5g of total RNA was first converted into single-stranded cDNA with reverse transcriptase using an oligo-dT primer containing the T7 RNA polymerase promoter site and then copied to produce double-stranded cDNA molecules. The double stranded cDNA was cleaned and concentrated with the supplied columns and used in an overnight in-vitro transcription reaction where single-stranded RNA (cRNA) was generated and labeled by incorporation of biotin-16-UTP. Arrays were hybridized using a total of 0.75ug of biotin-labeled cRNA at 58 degrees C for 16 hours to Illumina's Sentrix MouseRef-8 v2 Expression BeadChips. Each BeadChip has ~24,000 well-annotated RefSeq transcripts with approximately 30-fold redundancy. The arrays were washed, blocked and the biotin labeled cRNA was detected by staining with streptavidin-Cy3. Arrays were scanned at a resolution of 0.8um using the Beadstation 500 X from Illumina and the data was extracted using the Illumina GenomeStudio software(v1.6.0). Any spots at or below the background were filtered out using an Illumina detection p value of 0.02 and above. The natural log of all remaining scores were used to find the avg and std of each array and the z-score normalization was calculated and presented below. Z-score = (raw value - avg)/std.

Dataset Information

Comparison of the long-term effects of calorie restriction without malnutrition on global gene expression profiles of rat and human skeletal muscle [Rat]

Publications

Calorie restriction in humans inhibits the PI3K/AKT pathway and induces a younger transcription profile.

Similar Datasets

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