Author:
Tao Min,Shi Yingfeng,Chen Hui,Li Jinqing,Wang Yi,Ma Xiaoyan,Du Lin,Wang Yishu,Yang Xinyu,Hu Yan,Zhou Xun,Zhong Qin,Yan Danying,Qiu Andong,Zhuang Shougang,Liu Na
Abstract
AbstractThe disruptor of telomeric silencing 1-like (DOT1L), a specific histone methyltransferase that catalyzed methylation of histone H3 on lysine 79, was associated with the pathogenesis of many diseases, but its role in peritoneal fibrosis remained unexplored. Here, we examined the role of DOT1L in the expression and activation of protein tyrosine kinases and development of peritoneal fibrosis. We found that a significant rise of DOT1L expression in the fibrotic peritoneum tissues from long-term PD patients and mice. Inhibition of DOT1L significantly attenuated the profibrotic phenotypic differentiation of mesothelial cells and macrophages, and alleviated peritoneal fibrosis. Mechanistically, RNA sequencing and proteomic analysis indicated that DOT1L was mainly involved in the processes of protein tyrosine kinase binding and extracellular matrix structural constituent in the peritoneum. Chromatin immunoprecipitation (ChIP) showed that intranuclear DOT1L guided H3K79me2 to upregulate EGFR in mesothelial cells and JAK3 in macrophages. Immunoprecipitation and immunofluorescence showed that extranuclear DOT1L could interact with EGFR and JAK3, and maintain the activated signaling pathways. In summary, DOT1L promoted the expression and activation of tyrosine kinases (EGFR in mesothelial cells and JAK3 in macrophages), promoting cells differentiate into profibrotic phenotype and thus peritoneal fibrosis. We provide the novel mechanism of dialysis-related peritoneal fibrosis (PF) and the new targets for clinical drug development. DOT1L inhibitor had the PF therapeutic potential.
Funder
National Nature Science Foundation of China grants
Shanghai Scientific Committee of China
Key Discipline Construction Project of Shanghai Pudong New Area Health Commission
Project of the Outstanding Leaders Training Program of Pudong Health Bureau of Shanghai
Pudong Health Bureau of Shanghai
Shanghai Health Bureau and Shanghai administration of traditional Chinese Medicine of China
Clinical Investigation Grant of Shanghai East Hospital
China Postdoctoral Science Foundation
Youth Cultivation Talent Fund of Shanghai East Hospital
Publisher
Springer Science and Business Media LLC
Subject
Molecular Medicine,Molecular Biology