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GUT : 酒精通过FoxO1调节肝细胞中的miR-148a以及通过TXNIP过表达来促进肝细胞凋亡

2018-11-19 MedSci MedSci原创

酒精性肝病(ALD)是慢性肝病死亡的主要原因。然而,其发病机制尚未完全明确。微小RNA(miRNA)是肝脏疾病进展的关键因素。该研究调查了ALD失调的肝细胞丰富的miRNA,其对肝细胞损伤的影响和潜在的基础。

目的
酒精性肝病(ALD)是慢性肝病死亡的主要原因。然而,其发病机制尚未完全明确。微小RNA(miRNA)是肝脏疾病进展的关键因素。该研究调查了ALD失调的肝细胞丰富的miRNA,其对肝细胞损伤的影响和潜在的基础。

方法
使用酒精性肝炎(AH)人和动物肝脏样品和肝细胞来检测miR-148a水平。使用慢病毒将Pre-miR-148a在体内特异性递送至肝细胞。并在细胞模型中进行免疫印迹,荧光素酶基因测定,染色质免疫沉淀和免疫荧光测定

结果
miRNA谱和PCR分析使研究人员发现AH患者肝脏中miR-148a显着减少。在接受Lieber-DeCarli酒精饮食或饮酒的小鼠中,miR-148a水平也显着降低。在培养的肝细胞和小鼠肝脏中,酒精暴露抑制FoxO1表达,其与miR-148a水平相关并且在人AH样品中显着降低。FoxO1被鉴定为MIR148A的转录因子激活。MiR-148a直接抑制硫氧还蛋白相互作用蛋白(TXNIP)的表达。因此,用乙醇处理肝细胞导致TXNIP过表达,激活NLRP3炎性体和半胱天冬酶-1介导的焦磷酸化。向小鼠的肝细胞特异性递送miR-148a消除了酒精诱导的TXNIP过表达和炎性体激活,减轻了肝损伤。

结论 
酒精通过FoxO1降低肝细胞中miR-148a的表达,促进TXNIP过表达和NLRP3炎性体激活,诱导肝细胞凋亡。

原始出处

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    2019-09-04 xjy02
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    2019-02-15 lq1767
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    2019-01-09 smallant2002
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    2018-11-20 许安

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