过多的脂肪酸激活PRMT5/MDM2/Drosha通路,以调节miRNA生物发生和脂质代谢
Aijun Hou1,2, Xiaoding Xu1,3, Yu Zhang1,2
1Center for Drug Safety Evaluation and Research, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.
概括
在非酒精性脂肪性肝病 (NAFLD) 中,过量的脂肪酸会破坏微RNA (miRNA) 生物发生. 棕酸激活了PRMT5-MDM2-Drosha信号,损害了miRNA的产生,并加剧了NAFLD的进展.
科学领域:
- 分子生物学分子生物学
- 肝病学 肝病学是一种肝病学.
- 生物化学 生物化学
背景情况:
- 过多的肝脂肪酸会导致脂毒性和细胞压力,导致非酒精性脂肪肝疾病 (NAFLD).
- 已知脂肪酸过载会调节特定的microRNAs (miRNAs),这促使对miRNA生物发生的研究.
- 了解脂肪酸和miRNA调节之间的联系对于NAFLD病变的产生至关重要.
研究的目的:
- 在NAFLD的背景下,研究脂肪酸过载和miRNA生物发生之间的关系.
- 阐明脂肪酸影响miRNA生产的分子机制.
- 确定参与NAFLD中脂肪酸诱导的miRNA失调的关键调节者.
主要方法:
- 对基因表达综合 (GEO) 数据集和miRNA测序 (miRNA-seq) 的分析.
- 在体外测试包括miRNA裂变测试,RT-qPCR,西部涂抹,免疫光和共免疫沉 (co-IP).
- 在体内研究中,使用高脂肪,高果糖,高胆固醇饮食养的小鼠进行了AAV2/8介导的Drosha或PRMT5.5敲击.
主要成果:
- 棕酸 (PA) 抑制了miRNA裂变和降低了微处理器活动,表明miRNA生物生成受损.
- PA诱导了Drosha的蛋白质体降解,这是一个关键的miRNA处理酶,在体内加剧了NAFLD表型.
- PA增加了PRMT5甲基转移酶活性,导致Drosha通过MDM2降解,一种全方位素E3结合酶. 击败PRMT5改善了脂质代谢.
结论:
- 建立了miRNA剂量和NAFLD发展之间的直接联系.
- 证明棕酸激活PRMT5-MDM2-Drosha信号通路,调节miRNA生物发生.
- 确定PRMT5是NAFLD脂质代谢的关键调节者,其抑制改善了疾病表型.
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