Functional characters of non-coding RNAs in alcoholic liver injury

非编码RNA在酒精性肝损伤中的功能特征

• 批准号: 10044417
• 负责人: FANYIN MENG
• 金额: --
• 依托单位: RLR VA MEDICAL CENTER
• 依托单位国家: 美国
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2023-09-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10044417
• 关键词: Aging; Alcoholic Liver Diseases; Alcoholic steatohepatitis; Alcohols; Animal Diseases; Applications Grants; Blood Circulation; CRISPR/Cas technology; Cell Aging; Cells; Cirrhosis; Clinical; Data; Development; E2F transcription factors; Endothelial Cells; Endothelium; Endotoxins; Ethanol; Ethanol Metabolism; Ethanol dependence; Fatty Liver; Fibrosis; Foundations; Functional disorder; Gene Expression; Genes; Genetic Transcription; Goals; Health; Hepatic; Hepatocyte; Human; IGFBP3 gene; Inflammation; Inflammatory; Intervention; Knockout Mice; Link; Lipopolysaccharides; Literature; Liver; Liver Fibrosis; Liver diseases; Mediating; Mediator of activation protein; MicroRNAs; Morbidity - disease rate; Mus; Outcome; PPAR alpha; Pathway interactions; Patients; Phenotype; Plasminogen Activator Inhibitor 1; Play; Prevention strategy; Primary carcinoma of the liver cells; Prognosis; Recovery; Research; Risk Factors; Role; SIRT1 gene; Severities; Specimen; Stimulus; Stomach; Structure; TLR4 gene; TNF gene; TP53 gene; Therapeutic Effect; Tissues; United States; Untranslated RNA; Vascular Diseases; Veterans; alcohol-related injury; base; cell growth regulation; cell injury; chronic alcohol ingestion; chronic liver disease; chronic liver injury; effective therapy; endothelial dysfunction; endothelial stem cell; evidence base; expectation; extracellular vesicles; feeding; hepatic sinusoid; in vivo; liver development; liver injury; mortality; novel; prevent; problem drinker; senescence; treatment strategy

Alcoholic liver disease (ALD) is one of the most common forms of chronic liver injury in the United States. Chronic ethanol consumption results in toxic metabolites in the liver and increases endothelial senescence and dysfunction leading to inflammation and liver damage. Aging is linked with the severity and poor prognosis of various liver diseases including alcoholic liver diseases and is associated gradual alteration of structure and function in liver tissues and cells including liver sinusoidal endothelial cells. Endothelial dysfunction is an early pathophysiological hallmark in the development of liver disease. Senescence, the cellular equivalent of aging, was proposed to be involved in endothelial dysfunction. Indeed, enhanced cellular senescence was associated with a poor outcome in alcohol-related fatty liver disease, while increased hepatic senescence mediators such as p21 and TNF-α that were related to liver/endothelial dysfunction in ALD cirrhosis. Increasing evidence supports that non-coding RNAs (ncRNAs) play a central role in various cellular pathways by regulating gene expression. Indeed, there is a strong link between ethanol metabolism and endotoxin/lipopolysaccharide (LPS) induced cellular senescence and endothelial dysfunction in ALDs. Hepatic sinusoids, connected directly to the portal circulation, serve as the first barrier against these inflammatory and noxious stimuli. We have novel preliminary data showing that selective ncRNA/microRNA genes are aberrantly expressed in liver specimens from ALD animals and are regulated and involved in ethanol metabolism. In particular, we have found: (a) intra-gastric ethanol feeding significantly increased the expression of cellular senescence initiators EGR1, PAI-1 and Id1 and silenced p53 effectors E2F1 and IGFBP3; (b) ethanol enhanced microRNA-34a and p53 expressions and altered their target genes such as SIRT1, PPARα and HNF4α, which leads to senescence phenotypes in liver sinusoidal endothelial cells (LSECs); (c) Inhibition of miR-34a/p53/TLR4 by anti-miR-34a/p53 Morpholino and CRISPR/cas9 approaches has successfully recovered alcoholic liver injury in ethanol treated mice in vivo. Although the combined evidence supports a link between ncRNAs and alcoholic liver disease, there is a critical need to determine the underlying mechanism whereby ethanol-dependent miRNAs promote alcoholic liver injury. Our long-term goal is to determine underlying mechanisms contributing to alcohol- induced liver disease so that new mechanism-based, clinically effective prevention or treatment strategies can be developed. The objective for this proposal is to determine how ethanol- dependent ncRNAs mediate endothelial dysfunction and senescence in the progression of alcoholic liver diseases. Our central hypothesis is that ethanol-dependent miRNAs contribute to alcoholic liver injury through regulation of cellular senescence and dysfunction in endothelial cells. This hypothesis was formulated based upon the existing literature and our own preliminary data described above. The following three specific aims are proposed: First, we will determine the effects of ncRNA mediated cellular senescence and endothelial dysfunction in senescence accelerated mice with alcoholic liver injury in vivo (Aim 1). Second, we will identify the downstream targets of p53-miR-34a axis that are involved in endothelial senescence and dysfunction in miR-34a and p53 knockout mice in vivo (Aim 2). Further, we will determine the effects of endothelial progenitor cell related ncRNAs enriched extracellular vesicles on anti-senescence/anti- endothelial dysfunction and recovery of alcoholic liver injury in vivo (Aim 3). At the completion of the proposed research, it is our expectation to have an important positive impact because a mechanistic understanding of the role ncRNAs play in alcohol related injury, endothelial cell and senescence mediated liver disease is likely to provide a foundation for the development of evidence-based clinically useful approaches to treat or prevent human alcoholic liver diseases including US veterans.

酒精性肝病（ALD）是美国最常见的慢性肝损伤之一。