線粒體circRNA SCAR可減輕NASH
作者:
小柯機器人發布時間:2020/9/15 21:55:45
中山大學蘇士成等發現靶向線粒體定位的環狀RNA(circRNA) ATP5B調控子(SCAR)通過降低線粒體ROS(mROS)輸出減輕非酒精性脂肪性肝炎(NASH)。相關論文發表在2020年9月14日的《細胞》雜誌上。
通過NASH患者肝成纖維細胞的circRNA表達譜分析,他們觀察到NASH成纖維細胞下調的circRNA的很大一部分是線粒體circRNA。通過構建靶向線粒體的納米顆粒,他們觀察到位於線粒體中的與脂肪性肝炎相關的circRNA SCAR抑制mROS輸出和成纖維細胞活化。
由PGC-1α介導的circRNA SCAR與ATP5B結合,並通過阻斷CypD-mPTP相互作用而關閉mPTP。脂質超載會通過內質網(ER)應激誘導的CHOP抑制PGC-1α。在體內,靶向circRNA SCAR可減輕高脂飲食引起的肝硬化和胰島素抵抗。在臨床上,circRNA SCAR與脂肪變性到NASH的進展有關。
總的來說,他們確定了一種線粒體circRNA,可驅動炎症發生並充當NASH的治療靶標。
據了解,線粒體具有自己的基因組,並在免疫代謝疾病中起關鍵作用。然而,由於缺乏特定的遞送系統,位於線粒體的非編碼RNA的功能很大程度上未知。
附:英文原文
Title: Targeting Mitochondria-Located circRNA SCAR Alleviates NASH via Reducing mROS Output
Author: Qiyi Zhao, Jiayu Liu, Hong Deng, Ruiying Ma, Jian-You Liao, Huixin Liang, Jingxiong Hu, Jiaqian Li, Zhiyong Guo, Junchao Cai, Xiaoding Xu, Zhiliang Gao, Shicheng Su
Issue&Volume: 2020-09-14
Abstract: Mitochondria, which play central roles in immunometabolic diseases, have their owngenome. However, the functions of mitochondria-located noncoding RNAs are largelyunknown due to the absence of a specific delivery system. By circular RNA (circRNA)expression profile analysis of liver fibroblasts from patients with nonalcoholic steatohepatitis(NASH), we observe that mitochondrial circRNAs account for a considerable fractionof downregulated circRNAs in NASH fibroblasts. By constructing mitochondria-targetingnanoparticles, we observe that Steatohepatitis-associated circRNA ATP5B Regulator(SCAR), which is located in mitochondria, inhibits mitochondrial ROS (mROS) outputand fibroblast activation. circRNA SCAR, mediated by PGC-1α, binds to ATP5B and shutsdown mPTP by blocking CypD-mPTP interaction. Lipid overload inhibits PGC-1α by endoplasmicreticulum (ER) stress-induced CHOP. In vivo, targeting circRNA SCAR alleviates high fat diet-induced cirrhosis and insulin resistance.Clinically, circRNA SCAR is associated with steatosis-to-NASH progression. Collectively,we identify a mitochondrial circRNA that drives metaflammation and serves as a therapeutictarget for NASH.
DOI: 10.1016/j.cell.2020.08.009
Source: https://www.cell.com/cell/fulltext/S0092-8674(20)31000-X
Cell:《細胞》,創刊於1974年。隸屬於細胞出版社,最新IF:36.216