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Yang A, Jiao Y, Yang S, Deng M, Yang X, Mao C, Sun Y, Ding N, Li N, Zhang M, Jin S, Zhang H, Jiang Y. Homocysteine activates autophagy by inhibition of CFTR expression via interaction between DNA methylation and H3K27me3 in mouse liver. Cell Death Dis 2018; 9:169. [PMID: 29415998 PMCID: PMC5833451 DOI: 10.1038/s41419-017-0216-z] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 11/11/2017] [Accepted: 12/13/2017] [Indexed: 12/12/2022]
Abstract
Elevated homocysteine (Hcy) levels have been reported to be involved in liver injury, and autophagy plays an important role in normal hepatic physiology and pathophysiology, but the mechanism underlying Hcy regulated autophagy is currently unknown. In this study, CBS+/- mice were fed with regular diet for 12 weeks to establish a hyperhomocysteinemia (HHcy) model and HL-7702 cells were treated with Hcy, we found that Hcy increases autophagy and aggravates liver injury by downregulation of cystic fibrosis transmembrane conductance regulator (CFTR) expression in vivo and in vitro. Overexpression of CFTR inhibited the formation of autophagosomes and the expression of autophagy-related proteins BECN1, LC3-II/I and Atg12, while the expression of p62 increased in Hcy-treated hepatocytes and CBS+/- mice injected with lentivirus expressing CFTR. Further study showed that CFTR expression is regulated by the interaction of DNA methyltransferase 1 (DNMT1) and enhancer of zeste homolog 2 (EZH2), which, respectively, regulate DNA methylation and histone H3 lysine 27 trimethylation (H3K27me3). In conclusion, our study showed that Hcy activates autophagy by inhibition of CFTR expression via interaction between H3K27me3 and DNA methylation in the mouse liver. These findings provide new insight into the mechanism of Hcy-induced autophagy in liver injury.
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Affiliation(s)
- Anning Yang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, 750004, China.,Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan, China
| | - Yun Jiao
- Ningxia Medical University General Hospital, Yinchuan, 750004, China
| | - Songhao Yang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, 750004, China.,Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan, China
| | - Mei Deng
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, 750004, China.,Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan, China
| | - Xiaoling Yang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, 750004, China.,Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan, China
| | - Caiyan Mao
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, 750004, China.,Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan, China
| | - Yue Sun
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, 750004, China.,Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan, China
| | - Ning Ding
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, 750004, China.,Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan, China
| | - Nan Li
- Pharmacy college, Ningxia Medical University, Yinchuan, 750004, China
| | - Minghao Zhang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, 750004, China.,Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan, China
| | - Shaoju Jin
- Pharmacy college, Ningxia Medical University, Yinchuan, 750004, China
| | - Huiping Zhang
- Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan, China. .,Ningxia Medical University General Hospital, Yinchuan, 750004, China.
| | - Yideng Jiang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Ningxia Medical University, Yinchuan, 750004, China. .,Ningxia Key Laboratory of Vascular Injury and Repair Research, Yinchuan, China.
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