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Zhang M, Gong W, Zuo B, Chu B, Tang Z, Zhang Y, Yang Y, Zhou D, Weng M, Qin Y, Ma M, Jiang A, Ma F, Quan Z. The microRNA miR-33a suppresses IL-6-induced tumor progression by binding Twist in gallbladder cancer. Oncotarget 2018; 7:78640-78652. [PMID: 27769047 PMCID: PMC5346666 DOI: 10.18632/oncotarget.12693] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2016] [Accepted: 09/25/2016] [Indexed: 02/05/2023] Open
Abstract
Cytokine is a key molecular link between chronic inflammation and gallbladder cancer (GBC) progression. The potential mechanism of cytokine-associated modulation of microRNAs (miRNAs) expression in GBC progression is not fully understood. In this study, we investigated the biological effects and prognostic significance of interleukin-6 (IL-6) -induced miRNAs in the development of GBC. We identify that inflammatory cytokine, IL-6 promotes proliferation, migration, invasion and epithelial-mesenchymal transition (EMT) of GBC both in vitro and in vivo. Among all the changed miRNAs in miRNA profiling, miR-33a expression was significantly decreased in IL-6 treated GBC cell lines, as well as in GBC tissues compared with case-matched normal tissues and cholecystitis tissues. In turn, miR-33a suppresses IL-6-induced tumor metastasis by directly binding Twist which was identified as an EMT marker. High expression of miR-33a suppressed xenograft tumor growth and dissemination in nude mice. The downregulation of miR-33a was closely associated with advanced clinical stage, lymph node metastasis, and poor clinical outcomes in patients with GBC. miR-33a acts as a tumor suppressor miRNA in GBC progression and may be considered for the development of potential therapeutics against GBC.
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Affiliation(s)
- Mingdi Zhang
- Department of General Surgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China.,Department of Anesthesiology and Surgical Intensive Care Unit, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, 200092, China
| | - Wei Gong
- Department of General Surgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Bin Zuo
- Department of Orthopedic Surgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Bingfeng Chu
- Department of General Surgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Zhaohui Tang
- Department of General Surgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Yong Zhang
- Department of General Surgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Yong Yang
- Department of General Surgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Di Zhou
- Department of General Surgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Mingzhe Weng
- Department of General Surgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Yiyu Qin
- Department of General Surgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Mingzhe Ma
- Department of General Surgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Alex Jiang
- Schulich School of Medicine and Dentistry, Western Ontario University, London, ON N6A 3K6, Canada
| | - Fei Ma
- Department of Oncology, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
| | - Zhiwei Quan
- Department of General Surgery, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, 200092, China
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Abstract
MicroRNAs (miRNAs) are 21-22 nucleotide small noncoding RNAs that regulate gene expression posttranscriptionally. The miRNA is incorporated into the miRNP effector complex. The miRNP complex binds to the mRNA containing the target sites, which are partially homologous to the miRNA sequence, and represses protein synthesis. One of the critical functions of miRNP is the recruitment of deadenylase complexes to the target mRNAs. Deadenylation causes translational inhibition as well as mRNA destabilization. In this chapter, we describe our method to recapitulate miRNA-mediated deadenylation in a mammalian cell-free system.
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Affiliation(s)
- Motoaki Wakiyama
- Post-transcriptional Control Research Unit, RIKEN Center for Life Science Technologies, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, 230-0045, Japan,
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Abstract
The CCR4-CAF1-NOT complex is a major cytoplasmic deadenylation complex in yeast and mammals. This complex associates with RNA-binding proteins and microRNAs to repress translation of target mRNAs. We sought to determine how CCR4 and CAF1 participate in repression and control of maternal mRNAs using Xenopus laevis oocytes. We show that Xenopus CCR4 and CAF1 enzymes are active deadenylases and repress translation of an adenylated mRNA. CAF1 also represses translation independent of deadenylation. The deadenylation-independent repression requires a 5' cap structure on the mRNA; however, deadenylation does not. We suggest that mere recruitment of CAF1 is sufficient for repression, independent of deadenylation.
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Affiliation(s)
- Amy Cooke
- Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706, USA
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