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Zhang J, Tan J, Wang M, Wang Y, Dong M, Ma X, Sun B, Liu S, Zhao Z, Chen L, Liu K, Xin Y, Zhuang L. Lipid-induced DRAM recruits STOM to lysosomes and induces LMP to promote exosome release from hepatocytes in NAFLD. SCIENCE ADVANCES 2021; 7:eabh1541. [PMID: 34731006 PMCID: PMC8565908 DOI: 10.1126/sciadv.abh1541] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The biogenesis and diagnostic value of exosomes in nonalcoholic fatty liver disease (NAFLD) are unclear. In this study, we revealed that the plasma exosome level was higher in patients with NAFLD than that in healthy controls. Damage-regulated autophagy modulator (DRAM) was identified as one of the genes related to exosome secretion in patients with NAFLD. Then, loss or knockdown of DRAM down-regulated exosome secretion from hepatic cells using a knockout mouse model and a knockdown cell model. DRAM knockout reversed high-fat diet–induced increase of secreted exosomes. Furthermore, DRAM knockdown inhibited fatty acid (FA)–induced lysosomal membrane permeabilization and lysosome inhibitor reversed the down-regulation of exosome release in DRAM knockout mice. Last, FA-induced DRAM interacted with stomatin and promoted its lysosomal localization to enhance exosome secretion from hepatic cells. We revealed a DRAM-mediated mechanism for exosome secretion and provided the foundation for plasma exosomes as a potential biomarker for NAFLD.
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Affiliation(s)
- Jie Zhang
- Department of Infectious Diseases, Qingdao Municipal Hospital, Qingdao University, Qingdao 266071, China
| | - Jie Tan
- Department of Infectious Diseases, Qingdao Municipal Hospital, Qingdao University, Qingdao 266071, China
| | - Mengke Wang
- Department of Infectious Diseases, Qingdao Municipal Hospital, Qingdao University, Qingdao 266071, China
| | - Yifen Wang
- Department of Infectious Diseases, Qingdao Municipal Hospital, Qingdao University, Qingdao 266071, China
| | - Mengzhen Dong
- Department of Infectious Diseases, Qingdao Municipal Hospital, Qingdao University, Qingdao 266071, China
| | - Xuefeng Ma
- Department of Infectious Diseases, Qingdao Municipal Hospital, Qingdao University, Qingdao 266071, China
| | - Baokai Sun
- Department of Infectious Diseases, Qingdao Municipal Hospital, Qingdao University, Qingdao 266071, China
| | - Shousheng Liu
- Clinical Research Center, Qingdao Municipal Hospital, Qingdao University, Qingdao 266071, China
| | - Zhenzhen Zhao
- Clinical Research Center, Qingdao Municipal Hospital, Qingdao University, Qingdao 266071, China
| | - Lizhen Chen
- Department of Infectious Diseases, Qingdao Municipal Hospital, Qingdao University, Qingdao 266071, China
| | - Kai Liu
- Beijing Institute of Hepatology, Beijing Youan Hospital, Capital Medical University, Beijing 100069, China
| | - Yongning Xin
- Department of Infectious Diseases, Qingdao Municipal Hospital, Qingdao University, Qingdao 266071, China
- Corresponding author. (L.Z.); (Y.X.)
| | - Likun Zhuang
- Clinical Research Center, Qingdao Municipal Hospital, Qingdao University, Qingdao 266071, China
- Corresponding author. (L.Z.); (Y.X.)
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Xie Z, Song P, Zhong Y, Guo J, Gui L, Li M. Medaka gcnf is a component of chromatoid body during spermiogenesis. AQUACULTURE AND FISHERIES 2021. [DOI: 10.1016/j.aaf.2020.06.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Epithelium-specific ETS transcription factor-1 regulates NANOG expression and inhibits NANOG-induced proliferation of human embryonic carcinoma cells. Biochimie 2021; 186:33-42. [PMID: 33865902 DOI: 10.1016/j.biochi.2021.04.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 03/16/2021] [Accepted: 04/12/2021] [Indexed: 11/21/2022]
Abstract
The epithelium-specific ETS transcription factor-1 (ESE-1) plays multiple roles in pathogenesis and normal development of epithelial tissues. NANOG, a key mediator of stem cell self-renewal and pluripotency, is also expressed in various cancers and pluripotent cells. In this study, we investigated how ESE-1 influences NANOG expression and NANOG-induced proliferation in human germ cell-derived embryonic carcinoma NCCIT cells. Endogenous ESE-1 expression in NCCIT cells significantly increased during differentiation, whereas NANOG expression decreased. In addition, NANOG expression was downregulated by exogenous overexpression of ESE-1, and increased by shRNA-mediated knockdown of ESE-1. NANOG transcriptional activity was reduced by dose-dependent ESE-1 overexpression and a putative ESE-1 binding site (EBS) was mapped within conserved region 2. Site-directed mutagenesis of the putative EBS abrogated the repressive effect of ESE-1 on NANOG promoter activity. ESE-1 directly interacted with the putative EBS to regulate transcriptional activity of NANOG. Furthermore, NANOG-induced proliferation and colony formation of NCCIT cells were inhibited by ESE-1 overexpression and stimulated by ESE-1 shRNA-mediated knockdown. Altogether, our results suggest that ESE-1 exerts an anti-proliferative effect on NCCIT cells by acting as a novel transcriptional repressor of NANOG.
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