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Caloric Restriction engages hepatic RNA processing mechanisms in rhesus monkeys

ABSTRACT: Caloric Restriction (CR) extends lifespan and delays the onset of age-related disorders in diverse species. Metabolic regulatory pathways have been implicated in the mechanisms of CR, but the molecular details have not been elucidated. Here we show that CR engages RNA processing of genes associated with a highly integrated reprogramming of hepatic metabolism. We conducted molecular profiling of liver biopsies collected from adult male rhesus monkeys (Macaca mulatta) at baseline and after 2 years on control or CR (30% restricted) diet. Quantitation of over 20,000 molecules from the hepatic transcriptome, proteome, and metabolome, indicated that metabolism and RNA processing are major features of the response to CR. Predictive models identified lipid, branched chain amino acid, and short-chain carbon metabolic pathways, with alternate transcript use for over half of the genes in the CR network. We conclude that RNA-based mechanisms are central to the CR response and integral in metabolic reprograming.

ORGANISM(S): Macaca mulatta

PROVIDER: GSE104234 | GEO | 2018/03/14

REPOSITORIES: GEO

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Caloric restriction impacts plasma microRNAs in rhesus monkeys

Project description:Caloric restriction (CR) is one of the most robust interventions shown to delay aging in diverse species, including rhesus monkeys (Macaca mulatta). Identification of factors involved in CR brings a promise of translatability to human health and aging. Here, we show that CR induced a profound change in abundance of circulating microRNAs (miRNAs) linked to growth and insulin signaling pathway, suggesting that miRNAs are involved in CR’s mechanisms of action in primates. Deep sequencing of plasma RNA extracts enriched for short species revealed a total of 243 unique species of miRNAs including 47 novel species. Approxi- mately 70% of the plasma miRNAs detected were conserved between rhesus monkeys and humans. CR induced or repressed 24 known and 10 novel miRNA species. Regression analysis revealed correlations between bodyweight, adiposity, and insulin sensitivity for 10 of the CR-regulated known miRNAs. Sequence alignment and target identification for these 10 miRNAs identify a role in signaling downstream of the insulin receptor. The highly abundant miR-125a-5p correlated positively with adiposity and negatively with insulin sensitivity and was negatively regulated by CR. Putative target pathways of CR- associated miRNAs were highly enriched for growth and insulin signaling that have previously been implicated in delayed aging. Clustering analysis further pointed to CR-induced miRNA regula- tion of ribosomal, mitochondrial, and spliceosomal pathways. These data are consistent with a model where CR recruits miRNA- based homeostatic mechanisms to coordinate a program of delayed aging.

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Caloric Restriction engages hepatic RNA processing mechanisms in rhesus monkeys

Project description:Caloric Restriction engages hepatic RNA processing mechanisms in rhesus monkeys

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Caloric Restriction Engages Hepatic RNA Processing Mechanisms in Rhesus Monkeys.

Project description:Caloric restriction (CR) extends lifespan and delays the onset of age-related disorders in diverse species. Metabolic regulatory pathways have been implicated in the mechanisms of CR, but the molecular details have not been elucidated. Here, we show that CR engages RNA processing of genes associated with a highly integrated reprogramming of hepatic metabolism. We conducted molecular profiling of liver biopsies collected from adult male rhesus monkeys (Macaca mulatta) at baseline and after 2 years on control or CR (30% restricted) diet. Quantitation of over 20,000 molecules from the hepatic transcriptome, proteome, and metabolome indicated that metabolism and RNA processing are major features of the response to CR. Predictive models identified lipid, branched-chain amino acid, and short-chain carbon metabolic pathways, with alternate transcript use for over half of the genes in the CR network. We conclude that RNA-based mechanisms are central to the CR response and integral in metabolic reprogramming.

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Project description:MicroRNAs are small non-coding RNAs that are critical in post-transcriptional regulation. According to the latest miRBase (v22), there are 617 annotated pre-miRNAs in Macaca mulatta, which is much less than 1917 in human, although both of these two species are primates. To improve the annotation of miRNAs in Macaca mulatta, we generated 12 small RNA profiles from 8 tissues and perform comprehensive analysis of these profiles. We identified 613 conserved pre-miRNAs that have not been reported in Macaca mulatta and 25 novel miRNAs. Furthermore, we identified 996 editing sites with significant editing levels from 250 pre-miRNAs after analyzing the 12 self-generated and 58 additional published sRNA-seq profiles from different types of organs or tissues. Our results show that the distribution of different miRNA editing types in Macaca mulatta is different from that in human brains. Particularly, there are much more small indel events in miRNAs of Macaca mulatta than in human brains. These results significantly increase our understanding of miRNAs and their editing events in Macaca mulatta.

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Project description:Transposable elements (TE) account for more than 50% of human genome. It has been reported that some types of TEs are dynamically regulated in the reprogramming of human cell lines. However, it is largely unknown whether some TEs in Macaca mulatta are also regulated during the reprogramming of cell lines of monkey. Here, we systematically examined the transcriptional activities of TEs during the conversion of Macaca mulatta fibroblast cells to neuroepithelial stem cells (NESCs). Hundreds of TEs were dynamically regulated during the reprogramming of Macaca mulatta fibroblast cells. Furthermore, 60 Long Terminal Repeats (LTRs), as well as some integrase elements, of MacERV3 were transiently activated during the early stages of the conversion process. These LTRs were potentially bound by critical transcription factors for reprogramming, such as KLF4 and ETV5. These results suggest that the transcription of TEs are delicately regulated during the reprogramming of Macaca mulatta fibroblast cells. Although the family of ERVs activated during the reprogramming of fibroblast cells in Macaca mulatta are different from those in the reprogramming of human fibroblast cells, our results suggest that the activation of some ERVs is a conserved mechanism in primates for converting fibroblast cells to stem cells.

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A weekly alternating diet between caloric restriction and medium fat protects the liver from NAFLD in middle aged C57BL/6J mice

Project description:SCOPE: We investigated whether a novel dietary intervention consisting of an every-other-week calorie-restricted diet could prevent nonalcoholic fatty liver disease (NAFLD) development induced by a medium-fat (MF) diet. METHODS AND RESULTS: Nine-week-old male C57BL/6J mice received either a (i) control (C), (ii) 30E% calorie restricted (CR), (iii) MF (25E% fat), or (iv) intermittent (INT) diet, a diet alternating weekly between 40E% CR and an ad libitum MF diet until sacrifice at the age of 12 months. The metabolic, morphological, and molecular features of NAFLD were examined. The INT diet resulted in healthy metabolic and morphological features as displayed by the continuous CR diet: glucose tolerant, low hepatic triglyceride content, low plasma alanine aminotransferase. In contrast, the C- and MF-exposed mice with high body weight developed signs of NAFLD. However, the gene expression profiles of INT-exposed mice differed to those of CR-exposed mice and showed to be more similar with those of C- and MF-exposed mice with a comparable body weight. CONCLUSIONS: Our study reveals that the INT diet maintains metabolic health and reverses the adverse effects of the MF diet, thus effectively prevents the development of NAFLD in 12-month-old male C57BL/6J mice. Male C57Bl/6J mice were divided to 4 dietary intervention groups: Control (AIN-93W), 30% calorie restriction (CR; AIN-93W-CR), medium fat (MF; AIN-93W-MF; 25% energy from fat) and intermittent diet (INT; weekly alternating diet between AIN-93W-MF ad lib and 40% CR of AIN-93W). We performed various measurements on metabolic parameters and gene expression analysis on the liver. This entry represents the microarray data of the liver gene expression of each mouse.

2015-10-26 | E-GEOD-61233 | biostudies-arrayexpress

Gene expression profile from short-term caloric restriction in mouse adipose tissue

Project description:To provide a robust understanding of a transcriptomic change by short-term CR at body fat of mice, we applied three serial strengths of CR to mice including 15%, 30%, and 45% reduction of carbon source. Using Affymetrix mouse 1.0 ST array platform, we obtained and analyzed the transcriptome data for significantly changed genes in expression. Here, we identified 446 genes and categorized the genes based on their biological roles. We observed gradual down-regulation of several signaling pathways including insulin/insulin-like growth factor (IGF) 1, epidermal growth factor (EGF), transforming growth factor beta (TGF-Î²) and canonical Wingless-type mouse mammary tumor virus integration site (Wnt) signaling according to the CR strengths. Many genes related to structural feature including extracellular matrix (ECM), cell adhesion and cytoskeleton were also down-regulated with a strong correlation to the serial CR treatments. Furthermore, genes for cell cycle and adipogenesis were down-regulated. According to previous studies, these are target functions of the aforementioned four signaling pathways. On the other hand, the genes for specific metabolic features including tricarboxylic acid (TCA) cycle and electron transport chain (ETC) exhibited a transcriptional increase. In addition, adipose tissue expansion markers such as leptin, Mesoderm specific transcript (Mest) and Secreted frizzled-related sequence protein 5 (Sfrp5), and most genes for transport and immune response showed a down-regulation by CR. Comparing gene expression profiles to understand transcriptomic changes of adipose tissue by serial strength (15%, 30%, and 45%) of short-term (10 weeks) caloric restriction to young age (18 weeks) mice (n=3 in each group).

2015-12-31 | E-GEOD-60596 | biostudies-arrayexpress

An intermittent caloric restriction / medium fat diet protects liver from the progression of non-alcoholic fatty liver disease in C57BL/6J mice

Project description:Background & Aims: In this study, we investigated metabolic and molecular effects of weekly intervening 30% calorie restriction on long term natural progression of non-alcoholic fatty liver disease (NAFLD), which was induced by a medium fat diet. Methods: Male C57BL/6J mice of 9 weeks old received either (1) a control (C), (2) a calorie restricted (CR), (3) a medium fat (MF; 25%fat) or (4) an intermittent diet (ID), a weekly alternating diet consisting of calorie restriction and medium fat diet ad libitum until sacrifice at the age of 12 months. Various metabolic and molecular features of the liver were examined. Results: The ID regimen improved the status of a range of metabolic parameters and showed no progression to NAFLD: proper glucose tolerance, low hepatic triglyceride content, low plasma alanine aminotransferase and no abnormalities in its liver morphological features; similarly to that of CR. In contrast, the metabolic parameters in a number of the C and MF animals indicated development of NAFLD and hepatic fibrosis, which was positively correlated with body weight. Despite the metabolic phenotypes similarity, the liver gene expression profile of ID-fed mice did not reflect that of CR mice and resembled more to C and MF-fed mice with similar low body weight. Conclusions: Our study reveals that ID is beneficial for metabolic health and prevents the development of NAFLD in mice, with a gene expression profile similar to C and MF diet in a body weight-dependent manner.

2018-05-09 | GSE53188 | GEO

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