1
|
Li C, Chen Y, Chen X, Wei Q, Cao B, Shang H. Downregulation of MicroRNA-193b-3p Promotes Autophagy and Cell Survival by Targeting TSC1/mTOR Signaling in NSC-34 Cells. Front Mol Neurosci 2017; 10:160. [PMID: 28611587 PMCID: PMC5447700 DOI: 10.3389/fnmol.2017.00160] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Accepted: 05/09/2017] [Indexed: 02/05/2023] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease characterized by the death of upper and lower motor neurons. MicroRNAs (miRNAs) are reported to be closely related to the development of ALS. However, the precise functions of miRNAs in the pathogenesis of ALS remain largely unknown. In previous studies, we determined that miRNA-193b-3p was significantly downregulated in patients with sporadic ALS (sALS). Here, we observed that miRNA-193b-3p was downregulated in the SOD1G93A mouse model of ALS and promoted cell death in NSC-34 cells. We further found that miR-193b-3p directly targeted tuberous sclerosis 1 (TSC1) to regulate mechanistic target of rapamycin complex 1 (mTORC1) activity. Downregulation of miR-193b-3p led to TSC1 increase accompanied with mTORC1 inactivation, and vice versa. Moreover, downregulation of miR-193b-3p promoted protective autophagy and cell survival in NSC-34 cells. In contrast, upregulation of miR-193b-3p activated mTORC1 signaling, leading to inhibition of autophagy and promotion of cell death. Taken together, our study suggests that downregulation of miR-193b-3p is required for cell survival by targeting TSC1/mTOR signaling in NSC-34 cells and provides a novel target for improving the clinical therapy of ALS.
Collapse
Affiliation(s)
- ChunYu Li
- Department of Neurology, West China Hospital, Sichuan UniversityChengdu, China.,West China Brain Research Center, West China Hospital, Sichuan UniversityChengdu, China
| | - YongPing Chen
- Department of Neurology, West China Hospital, Sichuan UniversityChengdu, China.,West China Brain Research Center, West China Hospital, Sichuan UniversityChengdu, China
| | - XuePing Chen
- Department of Neurology, West China Hospital, Sichuan UniversityChengdu, China.,West China Brain Research Center, West China Hospital, Sichuan UniversityChengdu, China
| | - QianQian Wei
- Department of Neurology, West China Hospital, Sichuan UniversityChengdu, China.,West China Brain Research Center, West China Hospital, Sichuan UniversityChengdu, China
| | - Bei Cao
- Department of Neurology, West China Hospital, Sichuan UniversityChengdu, China.,West China Brain Research Center, West China Hospital, Sichuan UniversityChengdu, China
| | - HuiFang Shang
- Department of Neurology, West China Hospital, Sichuan UniversityChengdu, China.,West China Brain Research Center, West China Hospital, Sichuan UniversityChengdu, China
| |
Collapse
|
2
|
Lin SR, Yeh HC, Wang WJ, Ke HL, Lin HH, Hsu WC, Chao SY, Hour TC, Wu WJ, Pu YS, Huang AM. MiR-193b Mediates CEBPD-Induced Cisplatin Sensitization Through Targeting ETS1 and Cyclin D1 in Human Urothelial Carcinoma Cells. J Cell Biochem 2016; 118:1563-1573. [PMID: 27918099 DOI: 10.1002/jcb.25818] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 11/28/2016] [Indexed: 12/15/2022]
Abstract
Transcription factor CCAAT/enhancer-binding protein delta (CEBPD) plays multiple roles in tumor progression. Studies have demonstrated that cisplatin (CDDP) induced CEBPD expression and had led to chemotherapeutic drug resistance. However, the underlying molecular mechanisms of CDDP-regulated CEBPD expression and its relevant roles in CDDP responses remain elusive. MicroRNAs (miRNAs) are small non-coding RNAs that negatively regulate gene expression in a sequence-specific manner. Abnormal miRNAs expression is associated with tumor progression. In current study, a large-scale PCR-based miRNA screening was performed to identify CEBPD-associated miRNAs in urothelial carcinoma cell line NTUB1. Eleven miRNAs were selected with more than twofold changes. MiR-193b-3p, a known tumor suppressor, down-regulated proto-oncogenes Cyclin D1, and ETS1 expression and led to cell cycle arrest, cell invasion, and migration inhibition. The expression of miR-193b-3p was associated with the DNA binding ability of CEBPD in CDDP response. CEBPD knocking-down approach provided a strong evidence of the positive correlation between CEBPD and miR-193b-3p. CDDP-induced CEBPD trans-activated miR-193b-3p expression and it directly targeted the 3'-UTR of Cyclin D1 and ETS1 mRNA, and silenced the protein expression. In addition, miR-193b-3p also inhibited cell migration activity, arrested cell at G1 phase, and sensitized NTUB1 to CDDP treatment. In conclusion, this study indicates that CEBPD exhibits an anti-tumorigenic function through transcriptionally activating miR-193b-3p expression upon CDDP treatment. This study provides a new direction for managing human urothelial carcinoma. J. Cell. Biochem. 118: 1563-1573, 2017. © 2016 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Siao-Ren Lin
- Department of Biochemistry, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Hsin-Chih Yeh
- Department of Urology, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung, Taiwan.,Department of Urology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.,Department of Urology, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Wei-Jan Wang
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Hung-Lung Ke
- Department of Urology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.,Department of Urology, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Hui-Hui Lin
- Department of Urology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
| | - Wei-Chi Hsu
- Department of Biochemistry, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Urology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.,Institute of Basic Medical Sciences, National Cheng Kung University, Tainan, Taiwan
| | - Shih-Yi Chao
- Department of Computer Science and Information Engineering, Chien Hsin University of Science and Technology, Taoyuan, Taiwan
| | - Tzyh-Chyuan Hour
- Department of Biochemistry, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Institute of Basic Medical Sciences, National Cheng Kung University, Tainan, Taiwan
| | - Wen-Jeng Wu
- Department of Urology, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung, Taiwan.,Department of Urology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.,Department of Urology, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Center for Infectious Disease and Cancer Research, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yeong-Shiau Pu
- Department of Urology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - A-Mei Huang
- Department of Biochemistry, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Institute of Basic Medical Sciences, National Cheng Kung University, Tainan, Taiwan.,Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Ph. D. Program in Toxicology, School of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan
| |
Collapse
|