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Super enhancer regulation of cytokine-induced chemokine production in alcoholic hepatitis

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单位: [1]Mayo Clin, Div Gastroenterol & Hepatol, Rochester, MN 55902 USA [2]Huazhong Univ Sci & Technol, Tongji Hosp, Tongji Med Coll, Dept Gastroenterol, Wuhan, Peoples R China [3]Sichuan Univ, West China Hosp, Lab Gastroenterol & Hepatol, Chengdu, Peoples R China [4]Pontificia Univ Catolica Chile, Sch Med, Dept Gastroenterol & Hepatol, Santiago, Chile [5]Univ Minnesota, Dept Chem, 207 Pleasant St SE, Minneapolis, MN 55455 USA [6]Henan Prov Peoples Hosp, Dept Resp & Crit Care Med, Zhengzhou, Peoples R China [7]Mayo Clin, Dept Pulm & Crit Care Med, Rochester, MN USA [8]Mayo Clin, Dept Physiol & Biomed Engn, Rochester, MN USA [9]Univ Pittsburgh, Dept Gastroenterol Hepatol & Nutr, Pittsburgh, PA USA [10]Mayo Clin, Ctr Individualized Med, Rochester, MN 55902 USA [11]Univ Lille, Lille, France
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Alcoholic hepatitis (AH) is associated with liver neutrophil infiltration through activated cytokine pathways leading to elevated chemokine expression. Super-enhancers are expansive regulatory elements driving augmented gene expression. Here, we explore the mechanistic role of super-enhancers linking cytokine TNF alpha with chemokine amplification in AH. RNA-seq and histone modification ChIP-seq of human liver explants show upregulation of multiple CXCL chemokines in AH. Liver sinusoidal endothelial cells (LSEC) are identified as an important source of CXCL expression in human liver, regulated by TNF alpha /NF-kappa B signaling. A super-enhancer is identified for multiple CXCL genes by multiple approaches. dCas9-KRAB-mediated epigenome editing or pharmacologic inhibition of Bromodomain and Extraterminal (BET) proteins, transcriptional regulators vital to super-enhancer function, decreases chemokine expression in vitro and decreases neutrophil infiltration in murine models of AH. Our findings highlight the role of super-enhancer in propagating inflammatory signaling by inducing chemokine expression and the therapeutic potential of BET inhibition in AH treatment. Alcoholic hepatitis is characterized by intense liver inflammation driven by excessive cytokines and chemokines production and immune cell infiltration. Here the authors identify a super-enhancer that regulates the expression of multiple CXCL chemokines in alcoholic hepatitis and may be a potential therapeutic target.

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出版当年[2020]版:
大类 | 1 区 综合性期刊
小类 | 1 区 综合性期刊
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大类 | 1 区 综合性期刊
小类 | 1 区 综合性期刊
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Q1 MULTIDISCIPLINARY SCIENCES
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Q1 MULTIDISCIPLINARY SCIENCES

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第一作者单位: [1]Mayo Clin, Div Gastroenterol & Hepatol, Rochester, MN 55902 USA
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