锤头状法尼醇X受体激动剂可诱导一种增强子RNA,改善小鼠非酒精性脂肪性肝炎。
Hammerhead-type FXR agonists induce an enhancer RNA that ameliorates nonalcoholic steatohepatitis in mice.
作者信息
Chen Jinjing, Wang Ruoyu, Xiong Feng, Sun Hao, Kemper Byron, Li Wenbo, Kemper Jongsook
机构信息
Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, United States.
Department of Biochemistry and Molecular Biology, McGovern Medical School, University of Texas Health Science Center, Houston, United States.
出版信息
Elife. 2024 Apr 15;13:RP91438. doi: 10.7554/eLife.91438.
The nuclear receptor, farnesoid X receptor (FXR/NR1H4), is increasingly recognized as a promising drug target for metabolic diseases, including nonalcoholic steatohepatitis (NASH). Protein-coding genes regulated by FXR are well known, but whether FXR also acts through regulation of long non-coding RNAs (lncRNAs), which vastly outnumber protein-coding genes, remains unknown. Utilizing RNA-seq and global run-on sequencing (GRO-seq) analyses in mouse liver, we found that FXR activation affects the expression of many RNA transcripts from chromatin regions bearing enhancer features. Among these we discovered a previously unannotated liver-enriched enhancer-derived lncRNA (eRNA), termed FXR-induced non-coding RNA (). We show that is specifically induced by the hammerhead-type FXR agonists, including GW4064 and tropifexor. CRISPR/Cas9-mediated liver-specific knockdown of in dietary NASH mice reduced the beneficial effects of tropifexor, an FXR agonist currently in clinical trials for NASH and primary biliary cholangitis (PBC), indicating that amelioration of liver fibrosis and inflammation in NASH treatment by tropifexor is mediated in part by . Overall, our findings highlight that pharmacological activation of FXR by hammerhead-type agonists induces a novel eRNA, , contributing to the amelioration of NASH in mice. may represent a new drug target for addressing metabolic disorders, including NASH.
核受体法尼酯X受体(FXR/NR1H4)越来越被认为是代谢性疾病(包括非酒精性脂肪性肝炎,即NASH)的一个有前景的药物靶点。受FXR调控的蛋白质编码基因是众所周知的,但FXR是否也通过调控数量远多于蛋白质编码基因的长链非编码RNA(lncRNA)发挥作用,仍不清楚。利用小鼠肝脏中的RNA测序(RNA-seq)和全局延伸测序(GRO-seq)分析,我们发现FXR激活会影响许多来自具有增强子特征的染色质区域的RNA转录本的表达。在这些转录本中,我们发现了一种先前未注释的、肝脏富集的、源自增强子的lncRNA(eRNA),称为FXR诱导的非编码RNA()。我们表明,包括GW4064和曲匹西奥在内的锤头型FXR激动剂可特异性诱导 。在饮食诱导的NASH小鼠中,CRISPR/Cas9介导的肝脏特异性敲低 降低了曲匹西奥(一种目前正在进行NASH和原发性胆汁性胆管炎(PBC)临床试验的FXR激动剂)的有益作用,这表明曲匹西奥在NASH治疗中对肝纤维化和炎症的改善部分是由 介导的。总体而言,我们的研究结果突出表明,锤头型激动剂对FXR的药理激活诱导了一种新的eRNA, ,有助于改善小鼠的NASH。 可能代表了一个针对包括NASH在内的代谢紊乱的新药物靶点。