Expression data from mouse liver
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE92912 | GEO | 2016/12/27
SECONDARY ACCESSION(S): PRJNA358813
REPOSITORIES: GEO
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Project description:Individuals with hepatic steatosis often display several metabolic abnormalities including insulin resistance and muscle atrophy. Previously, we found that hepatic steatosis results in an altered hepatokine secretion profile, thereby inducing skeletal muscle insulin resistance via inter-organ crosstalk. In this study, we aimed to investigate whether the altered secretion profile in the state of hepatic steatosis also induces skeletal muscle atrophy via effects on muscle protein turnover. To investigate this, eight-week-old male C57BL/6J mice were fed a chow (4.5% fat) or a high-fat diet (HFD; 45% fat) for 12 weeks to induce hepatic steatosis, after which the livers were excised and cut into ~200 µm slices. Slices were cultured to collect secretion products (conditioned medium; CM). Differentiated L6-GLUT4myc myotubes were incubated with chow or HFD CM to measure glucose uptake. Differentiated C2C12 myotubes were incubated with chow or HFD CM to measure protein synthesis and breakdown, and gene expression via RNA sequencing. Furthermore, proteomics analysis was performed in chow and HFD CM. It was found that HFD CM caused insulin resistance in L6-GLUT4myc myotubes compared with chow CM, as indicated by a blunted insulin-stimulated increase in glucose uptake. Furthermore, protein breakdown was increased in C2C12 cells incubated with HFD CM, while there was no effect on protein synthesis. RNA profiling of C2C12 cells indicated that 197 genes were differentially expressed after incubation with HFD CM, compared with chow CM, and pathway analysis showed that pathways related to anatomical structure and function were enriched. Proteomic analysis of the CM showed that 32 proteins were differentially expressed in HFD CM compared with chow CM. Pathway enrichment analysis indicated that these proteins had important functions with respect to insulin-like Growth Factor transport and uptake, and affect post-translational processes, including protein folding, protein secretion and protein phosphorylation. In conclusion, the results of this study support the hypothesis that secretion products from the liver contribute to the development of muscle atrophy in individuals with hepatic steatosis.
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Project description:This study sought to interrogate the effects of lipids and lipid metabolites on the hepatic proteome. Protein expression in high-fat diet (HFD) mouse livers vs. livers of normal chow fed (NC) mice were investigated using multiplexed quantitative LC-MS/MS (TMT labeling). This experiment contains additional replicates for normal chow and mice on high-fat diet for 16 weeks.
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Project description:To identify molecular mechanism underlying the protection from diet-induced hepatic steatosis in AHNAK deficiency mice, we examined microarray analysis with liver sample from HFD-fed AHNAK KO and WT mice. Two-condition experiment, regular chow (CD) -fed WT vs. CD-fed AHNAK KO and High fat diet(HFD)-fed WT vs. HFD-fed AHNAK KO mice. Biological replicates: 3 control, One replicate per array.
2015-06-23 | E-GEOD-70119 | biostudies-arrayexpress
Project description:Serum response factor (SRF) is a transcription factor that binds to the serum response element (SRE) of genes that are expressed in response to mitogens. SRF plays essential roles in muscle and nervous system development; however, little is known about the role of SRF during liver growth and function. To examine the function of SRF in the liver, we generated mice in which the Srf gene was specifically disrupted in hepatocytes. The survival of mice lacking hepatic SRF activity was lower than that of control mice; moreover, surviving mutant mice were smaller and had lower blood glucose and triglyceride levels compared with control mice. Srf-deficient livers were also smaller than control livers, hepatocyte morphology was abnormal, and liver-cell proliferation and viability was compromised. Gene array and quantitative RT-PCR analysis of SRF depleted livers revealed a reduction in mRNAs encoding components of the growth hormone/IGF1 pathway, cyclins, several metabolic regulators, and cytochrome p450 enzymes. Conclusion: SRF is essential for hepatocyte proliferation and survival, liver function, and control of postnatal body growth by regulating hepatocyte gene expression. Experiment Overall Design: Total RNA was harvested from the following sources and used for Affymetrix array analysis following manufacturer defined protocols: Experiment Overall Design: control liver (Srf loxP/+ AlfpCre): 3 male mice (3 weeks old) Experiment Overall Design: mutant liver (Srf loxP/loxP AlfpCre): 3 male mice (3 weeks old), tissue used lacked Srf
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2017-01-11 | GSE88818 | GEO
Project description:In this setup we have used RNA-seq, DHS-seq, and H3K27ac ChIP-seq to identify changes in transcription, chromatin landscape and enhancer activity in livers of mice fed a high fat diet (HFD) and mice returned from HFD to Chow.
2016-12-15 | GSE87565 | GEO
Project description:Gene expression in livers of male wild-type (WT) and OGG1-deficient (Ogg1-/-) mice fed either a chow diet or a high-fat diet (HFD) were examined. Mice were fed the diet for 10 weeks prior to tissue collection and were 22 weeks of age at the time of tissue collection. 24 Total samples were analyzed. We generated the following pairwise comparisons using GeneSifter: WT Chow vs Ogg1-/- Chow; WT HFD vs. Ogg1-/- HFD using t-test followed by Benjamini and Hochberg correction. An adjusted p-value less than 0.05 was considered to be statistically significant.
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Project description:Perfluorooctanesulfonic acid (PFOS) is a persistent, bio-accumulative pollutant that has been used for the last 60+ years in numerous industrial and commercial applications. In mice, PFOS administration is known to induce hepatomegaly and hepatic steatosis. The aim of the present study was to evaluate potential PFOS and diet interactions and explore the mechanism of PFOS induced liver lipid accumulation. Prior to PFOS administration, mice were fed either a standard chow diet (SD) or 60% kCal high fat diet (HFD) for 4 weeks to establish significant body weight increase. After 4 weeks of diet acclimation, the treatment groups received 0.0003% PFOS in diet for an additional 10 weeks. In addition, a subset of the mice fed HFD were switched to a SD (H-SD) to mimic weight-loss induced improvement of hepatic steatosis. A total of six treatment groups: i) SD, ii) HSD, iii) HFD (H), iv) SD +PFOS(SDP), v) H-SD +PFOS (HSDP), and vi) HFD +PFOS (HP) were included. PFOS and lipid concentrations were measured in both serum and liver. Relative liver mRNA expression was determined by targeted bead array and proteins were quantified using untargeted mass spectrometry. PFOS exposure increased liver weight, and in the HFD increased liver triglycerides and liver cholesterol content. Gene and protein expression in the liver demonstrated that PFOS exposure induced lipid utilization and xenobiotic metabolism pathways, and in a HFD, induced lipid synthesis. The data suggests that PFOS exposure acts on lipid utilization genes and exacerbates hepatic steatosis in mice fed a HFD.
2020-09-30 | PXD016161 | Pride
Project description:Metabolic dysfunction-associated steatotic liver disease (MASLD) affects one third of the global population. Understanding metabolic pathways involved can provide insights into disease progression and treatment. Untargeted metabolomics of livers from mice with early-stage steatosis uncovered decreased methylated metabolites, suggesting altered one-carbon metabolism. The levels of glycine, a central component of one-carbon metabolism, were lower in mice with hepatic steatosis, consistent with clinical evidence. Stable-isotope tracing demonstrated that increased serine synthesis from glycine via reverse serine hydroxymethyltransferase (SHMT) is the underlying cause for decreased glycine in steatotic livers. Consequently, limited glycine availability in steatotic livers impaired glutathione synthesis under acetaminophen-induced oxidative stress, enhancing acute hepatotoxicity. Glycine supplementation or hepatocyte-specific
ablation of the mitochondrial SHMT2 isoform in mice with hepatic steatosis mitigated
acetaminophen-induced hepatotoxicity by supporting de novo glutathione synthesis. Thus, early metabolic changes in MASLD that limit glycine availability sensitize mice to xenobiotics even at the reversible stage of this disease.
2023-12-12 | MSV000093653 | MassIVE
Project description:Background and Aims: During severe or chronic hepatic injury, biliary epithelial cells (BECs), also known as cholangiocytes, undergo rapid reprogramming and proliferation, a process known as ductular reaction (DR), and allow liver regeneration by differentiating into both functional cholangiocytes and hepatocytes. While DR is a hallmark of chronic liver diseases, including advanced stages of non-alcoholic fatty liver disease (NAFLD), the early events underlying BEC activation are largely unknown. Since NAFLD initiates with increased lipid accumulation, a stage called steatosis; we hypothesized that BECs isolated directly from steatotic livers might address current knowledge gaps in early BEC activation. Approach and Results: Here, we used methods allowing isolation and extensive transcriptional characterization of BECs from chow diet (CD)- and high-fat diet (HFD)-fed mice livers. We demonstrate that BECs readily accumulate lipids during HFD feeding and that lipid overload induces the conversion of adult cholangiocytes into active BECs through upregulation of the cell cycle and DNA replication signature. This event is accompanied by significant downregulation of extracellular matrix organization in BECs derived from HFD-fed mice livers but not CD-fed mice livers. Mechanistically, we found that lipid overload unleashes the activation of the E2F transcription factors in BECs, which drives cell cycle progression.
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