Small RNA profiling of Simple steatosis and Non-alcoholic steatohepatitis in the liver of mice [miRNA-seq]
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA819051 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR18454575.fastq.gz | Fastqsanger.gz | |||
| SRR18454576.fastq.gz | Fastqsanger.gz | |||
| SRR18454577.fastq.gz | Fastqsanger.gz | |||
| SRR18454578.fastq.gz | Fastqsanger.gz | |||
| SRR18454579.fastq.gz | Fastqsanger.gz |
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Project description:In our study, C57BL/6 male mice were fed a normal chow diet or high-fat diet additionally containing high-fructose and high-cholesterol (HFHC diet) for 12 weeks and 28 weeks to construct simple steatosis (NAFL) and Non-alcoholic steatohepatitis (NASH) models respectively. Through lncRNA sequencing, a total of 1131 lncRNAs (798 up-regulated and 333 down-regulated) and 5161 lncRNAs (3168 up-regulated and 1993 down-regulated) were differentially expressed in livers of NAFL and NASH mice respectively. A total of 614 lncRNAs (455 up-regulated and 159 down-regulated) were dysregulated in both NASH and NAFL mice, while 4547 lncRNAs (2713 up-regulated; 1834 down-regulated) were altered specifically in NASH mice.
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Project description:Pathogenesis and factors for determining progression of alcoholic and non-alcoholic steatosis to steatohepatitis with risk of further progression to liver cirrhosis and cancer are poorly understood. In the present study, we aimed to identify potential molecular signatures for discrimination of steatohepatitis from steatosis. Global gene expression analysis was applied to unravel differentially expressed genes between steatohepatitis compared to steatosis and control samples. For functional annotation as well as the identification of disease-relevant biological processes of the differentially expressed genes the gene ontology (GO) database was used. Genes down-regulated in steatohepatitis were mainly involved in metabolic processes. Genes up-regulated in steatohepatitis samples were associated with cancer progression and proliferation. Further statistical and pathway analysis lead to the selection of 46 candidate genes which were validated in two sample cohorts by quantitative real-time PCR. In surgical liver resection samples 39 genes and in percutaneous liver biopsies 30 genes were significantly up-regulated in steatohepatitis. Conclusion: The development of steatohepatitis is characterized by distinct molecular changes. 44 human liver tissue surgical samples (normal n=13; steatosis n=19; steatohepatitis n=12, 8/2 cirrhotic/non-cirrhotic) obtained from patients undergoing liver surgery for HCC, other malignancy/metastatic disease, benign tumors of the liver and organ dedicated to transplantation. Virtually normal control samples in this cohort were taken from patients undergoing surgical resection of liver metastasis, but the surrounding liver tissue used for the molecular analyses was normal, non-tumorous liver tissue without detectable pathological changes. The samples were provided by the Biobank at the Medical University of Graz. This dataset is part of the TransQST collection.
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Project description:Long non-coding RNA profiling of Simple steatosis and Non-alcoholic steatohepatitis in the liver of mice
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Project description:Global gene expression patterns of 2 human steatosis and 9 human non-alcoholic steatohepatitis (NASH) together with their respective control patterns were analyzed to define the non-alcoholic fatty liver disease (NAFLD) progression molecular characteristics and to define NASH early markers from steatosis. Human liver samples of steatosis and non-alcoholic steatohepatitis were selected for RNA extraction and hybridization on Affymetrix microarrays. This dataset is part of the TransQST collection.
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Project description:The mechanisms underlying the progression of non-alcoholic steatohepatitis (NASH) are not completely elucidated. In this study we have integrated gene expression profiling of liver biopsies of NASH patients with translational studies in a mouse model of steatohepatitis and with pharmacological interventions in isolated hepatocytes to identify a novel mechanism implicated in the pathogenesis of NASH. By using high-density oligonucleotide microarray analysis we identified a significant enrichment of known genes involved in the multi-step catalysis of long chain polyunsaturated fatty acids, including delta-5 and 6 desaturases. A combined inhibitor of delta-5 and delta-6 desaturases significantly reduced intracellular lipid accumulation and inflammatory gene expression in isolated hepatocytes. Gas chromatography analysis revealed impaired delta-5 desaturase activity toward the omega-3 pathway in livers from mice with high-fat diet (HFD)-induced NASH. Consistently, restoration of omega-3 index in transgenic fat-1 mice expressing an omega-3 desaturase, which allows the endogenous conversion of omega-6 into omega-3 fatty acids, produced a significant reduction in hepatic insulin resistance, hepatic steatosis, macrophage infiltration and necroinflammatory liver injury, accompanied by attenuated expression of genes involved in inflammation, fatty acid uptake and lipogenesis. These results were comparable to those obtained in a group of mice receiving a HFD supplemented with EPA/DHA. Of interest, hepatocytes from fat-1 mice or supplemented with EPA exhibited synergistic anti-steatotic and anti-inflammatory actions with the delta-5/ delta-6 inhibitor. Conclusion: These findings indicate that both endogenous and exogenous restoration of the hepatic balance between omega-6 and omega-3 fatty acids and/or modulation of desaturase activities exert preventive actions in NASH. The complete database comprised the expression measurements of 18185 genes for liver sample groups: 8 non-alcoholic steatohepatitis (NASH ) and 7 control samples. This dataset is part of the TransQST collection.
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