Genetic AMPK activation in liver protects against diet-induced obesity and NAFLD
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA506251 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR8217110.fastq.gz | Fastqsanger.gz | |||
| SRR8217111.fastq.gz | Fastqsanger.gz | |||
| SRR8217112.fastq.gz | Fastqsanger.gz | |||
| SRR8217113.fastq.gz | Fastqsanger.gz | |||
| SRR8217114.fastq.gz | Fastqsanger.gz |
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Project description:We developed a GEMM in which AMPK can be inducibly activated in vivo (iAMPK mice). We provide here the data (RNA seq) on the transcriptional changes induced by AMPK activation in livers from mice fed a high-fat diet.
2019-02-05 | GSE122767 | GEO
Project description:Cysteine dioxygenase type 1 (Cdo1) is a key enzyme for cysteine catabolism that is enriched in liver, whose role in NAFLD remains poorly understood. Here, we show that exercise induces the expression of hepatic Cdo1 via the cAMP/PKA/CREB signaling pathway. Hepatocyte-specific knockout of Cdo1 (Cdo1LKO) impairs the effect of exercise against NAFLD, whereas hepatocyte-specific overexpression of Cdo1 (Cdo1LTG) and exercise synergistically ameliorates NAFLD in male mice. Mechanistically, Cdo1 facilitates the binding between AMPK and kinase active Camkk2, which activates AMPK signaling. This promotes fatty acid oxidation and mitochondrial biogenesis in hepatocytes to attenuate hepatosteatosis. Therefore, by promoting hepatic Camkk2-AMPK signaling pathway, Cdo1 acts as an important downstream effector of exercise to combat against NAFLD
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Project description:The AMP-activated protein kinase (AMPK) is a highly conserved master regulator of metabolism, whose activation has been proposed to be therapeutically beneficial for the treatment of several metabolic diseases, including nonalcoholic fatty liver disease (NAFLD). NAFLD, characterized by excessive accumulation of hepatic lipids, is the most common chronic liver disease and a major risk factor for development of nonalcoholic steatohepatitis, type 2 diabetes, and other metabolic conditions. To assess the therapeutic potential of AMPK activation, we have generated a genetically engineered mouse model, termed iAMPKCA, where AMPK can be inducibly activated in vivo in mice in a spatially and temporally restricted manner. Using this model, we show that liver-specific AMPK activation reprograms lipid metabolism, reduces liver steatosis, decreases expression of inflammation and fibrosis genes, and leads to significant therapeutic benefits in the context of diet-induced obesity. These findings further support AMPK as a target for the prevention and treatment of NAFLD.
| S-EPMC6344045 | biostudies-literature
Project description:AMPK activation protects against diet induced obesity through Ucp1-independent thermogenesis in subcutaneous white adipose
| PRJNA493063 | ENA
Project description:Purpose: To investigate alterations in subcutaneous white adipose gene expression induced by genetic AMPK activation in vivo, in mice fed a chow or a high-fat diet. Methods: Subcutaneous white adipose tissue mRNA profiles of wild-type transgenic (WT-Tg) mice and mice expressing a gain-of-function AMPK mutant gamma1 subunit (D316A-Tg) were generated by deep sequencing. Results: RNA sequencing revealed over 3000 differentially expressed genes between WT-Tg and D316A-Tg subcutaneous white adipose tissue (WATsc) from mice fed a high fat diet (HFD), of which many were classified as 'skeletal muscle-associated'. Interestingly, uncoupling protein 1 (UCP1), associated with 'beige' adipocyte formation in WATsc, was not differentially expressed. On a chow diet, many differentially expressed genes were also identified, with gene ontology analysis identifiying glycolysis, TCA cycle and brown fat differentiation as highly enriched; key features of brown adipocyte identity. HFD-associated skeletal-muscle associated gene expression was either not significantly altered, or significantly down-regulated on a chow diet, indicating a diet-induced gene signature in D316A-Tg WATsc. Conclusions: Our study revealed gene signatures indicative of brown adipocyte development on a chow diet, where no overt metabolic phenotype was observed in gain-of-function animals. When fed a HFD, WATsc from D316A-Tg mice displayed a muscle-like gene signature, expressing key components of creatine and calcium thermogenic cycles including Ckmt2 (creatine kinase, mitochondrial 2) Atp2a1 (SERCA1-sarco/endoplasmic reticulum ATPase 1) and ryr1 (ryanodine receptor 1). UCP1 expression was not altered between WT-Tg and D316A-Tg mice fed a HFD. Our findings suggest a novel role for AMPK in the regulation of white adipocyte identity and a potentially novel cell population that, when metabolically challenged, preferrentially utilise muscle-like thermogenic futile cycles independent of UCP1 to mediate whole organism energy expenditure.
2019-02-01 | GSE120429 | GEO
Project description:Liver fibrosis occurs during chronic liver disease. Advanced liver fibrosis results in cirrhosis, liver failure and often requires liver transplantation. However, due to the lack of human models, mechanisms underlining the pathogenesis of liver fibrosis remain unclear. Recent studies implicated a central role of deranged lipid metabolism in its pathogenesis. In this study, we generated LEPTIN-deficient (LEPTIN-/-) pigs using zinc finger nuclease technology to investigate the mechanisms of liver fibrosis associated with obesity. The LEPTIN-/- pigs showed increased body fat and significant insulin resistance by 12 months of age. To resemble non-alcoholic fatty liver disease (NAFLD) patients, LEPTIN-/- pig developed the phenotypic features of fatty liver, non-alcoholic steatohepatitis (NASH) and hepatic fibrosis with age. Meanwhile, LEPTIN absence reduced phosphorylation of JAK2-STAT3 and AMPK. The alteration of JAK2-STAT3 enhanced fatty acid β-oxidation, whereas inactivation of AMPK led to mitochondrial autophagy, and both contributed to increased oxidative stress in hepatocytes. Although Leptin deletion in the rat liver altered JAK2-STAT3 phosphorylation, it activated the AMPK pathway and prevented liver fibrogenesis in contrast with the LEPTIN-/- pig. To our knowledge, the LEPTIN-/- pig provides the first model recapitulating the full pathogenesis of NAFLD and its progression toward liver fibrosis. The activity of AMPK signaling pathway suggests a potential target for development of new strategies for the diagnosis and treatment of NAFLD.
2023-09-20 | GSE176023 | GEO
Project description:Obesity is a significant risk factor for various metabolic diseases and is closely related to non-alcoholic fatty liver disease (NAFLD) characterized by inflammation and oxidative stress. Clusterin is a multi-functional protein that is up-regulated in the pathogenesis of various metabolic diseases, including obesity and NAFLD. Our previous studies indicated that hepatocyte-specific overexpression of clusterin alleviates methionine choline-deficient (MCD) diet-induced non-alcoholic steatohepatitis (NASH) by activating nuclear factor erythroid 2-related factor 2 (Nrf2). Here we generated transgenic mice with whole-body clusterin overexpression (wCLU-tg) and investigated the role of clusterin in Western diet-induced obesity and NAFLD. We confirmed that obesity parameters and the spectrum of NAFLD of wCLU-tg mice were improved compared to wild type mice. Contrarily, clusterin deficiency deteriorated metabolic disruptions. We also found that clusterin activates target molecules for obesity and NAFLD, namely Nrf2 and AMPK, suggesting that clusterin protects against Western diet-induced obesity and NAFLD by activating Nrf2 and AMPK.
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Project description:DAG-activated Pkd1 promotes triglyceride accumulation in adipocytes; Pkd1 promotes lipogenesis and suppresses mitochondrial function in adipocytes in an AMPK-dependent manner; Pkd1 suppresses expression of genes characteristic for beige adipocytes; Deletion of Pkd1 in adipocytes protects mice from diet-induced obesity, T2D and liver steatosis.
2018-09-20 | GSE104797 | GEO
Project description:Energy homeostasis plays a key role in retarding aging, and mitochondria are responsible for energy production.AMPK plays a central role in maintaining energy homeostasis and mitochondrial homeostasis, and commands autophagy, a clearing and recycling process to maintain cellular homeostasis. However, the effect of AMPK activators on kidney aging has not been fully elucidated. We testified the effects of O304, a novel direct AMPK activator, in naturally aging mice model and D-galactose (D-gal)-treated renal tubular cell culture. We identified that O304 perfectly protects against cellular senescence and aged-related fibrosis in kidneys. Also, O304 restored energy metabolism, promoted autophagy, and preserved mitochondrial homeostasis. Transcriptomic sequencing also proved that O304 induced fatty acid metabolism, mitochondrial biogenesis and ATP process, and downregulated cell aging, DNA damage response and collagen organization. All these results suggest that O304 has a strong potential to retard aged kidney injury through regulating AMPK-induced multiple pathways.
2022-01-27 | GSE192512 | GEO
Project description:Cytokines of the IL-1 family are important modulators of obesity-induced inflammation and the development of systemic insulin resistance. Here, we report that IL-37, a newly-described antiinflammatory member of the IL-1 family, affects obesity-induced inflammation and insulin resistance. IL-37 transgenic mice (IL-37tg) did not develop an obese phenotype in response to a high-fat diet (HFD). Unlike WT mice, IL-37tg mice exhibited reduced numbers of adipose tissue macrophages and preserved glucose tolerance and insulin sensitivity after 16 weeks of HFD. A short-term HFD intervention revealed that the IL-37-mediated improvement in glucose tolerance is independent of bodyweight. IL-37tg mice manifested a beneficial metabolic profile with higher circulating levels of the anti-inflammatory adipokine adiponectin. In vitro treatment of differentiating adipocytes with recombinant IL-37 reduced adipogenesis. The beneficial effects of recombinant IL-37 involved activation of AMPK signaling. In humans, steady-state IL-37 adipose tissue mRNA levels were positively correlated with insulin sensitivity, lower adipose tissue levels of leptin and a lower inflammatory status of the adipose tissue. These findings reveal IL-37 as an important anti-inflammatory modulator during obesity-induced inflammation and insulin resistance in both mice and humans and suggest that IL-37 is a potential target for the treatment of obesity-induced insulin resistance and type 2 diabetes. Gene arrays were performed on epidydimal white adipose tissue samples from wild type and human IL37-overexpressing transgenic mice fed a high fat diet for 16 weeks.
2015-05-18 | E-GEOD-58952 | biostudies-arrayexpress