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Gao Y, Chen L, Song H, Chen Y, Wang R, Feng B. A double-negative feedback loop between E2F3b and miR- 200b regulates docetaxel chemosensitivity of human lung adenocarcinoma cells. Oncotarget 2018; 7:27613-26. [PMID: 27027446 PMCID: PMC5053675 DOI: 10.18632/oncotarget.8376] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Accepted: 03/16/2016] [Indexed: 12/18/2022] Open
Abstract
MicroRNAs (miRNAs) are non-coding small RNAs which negatively regulate gene expressions mainly through 3'-untranslated region (3'-UTR) binding of target mRNAs. Recent studies have highlighted the feedback loops between miRNAs and their target genes in physiological and pathological processes including chemoresistance of cancers. Our previous study identified miR-200b/E2F3 axis as a chemosensitivity restorer of human lung adenocarcinoma (LAD) cells. Moreover, E2F3b was bioinformatically proved to be a potential transcriptional regulator of pre-miR-200b gene promoter. The existance of this double-negative feedback minicircuitry comprising E2F3b and miR-200b was confirmed by chromatin immunoprecipitation (ChIP) assay, site-specific mutation and luciferase reporter assay. And the underlying regulatory mechanisms of this feedback loop on docetaxel resistance of LAD cells were further investigated by applying in vitro chemosensitivity assay, colony formation assay, flow cytometric analysis of cell cycle and apoptosis, as well as mice xenograft model. In conclusion, our results suggest that the double-negative feedback loop between E2F3b and miR-200b regulates docetaxel chemosensitivity of human LAD cells mainly through cell proliferation, cell cycle distribution and apoptosis.
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Affiliation(s)
- Yanping Gao
- Department of Medical Oncology, Jinling Hospital, School of Medicine, Nanjing University, Nanjing 210002, China
| | - Longbang Chen
- Department of Medical Oncology, Jinling Hospital, School of Medicine, Nanjing University, Nanjing 210002, China
| | - Haizhu Song
- Department of Medical Oncology, Jinling Hospital, School of Medicine, Nanjing University, Nanjing 210002, China
| | - Yitian Chen
- Department of Medical Oncology, Jinling Hospital, School of Medicine, Nanjing University, Nanjing 210002, China
| | - Rui Wang
- Department of Medical Oncology, Jinling Hospital, School of Medicine, Nanjing University, Nanjing 210002, China
| | - Bing Feng
- Department of Medical Oncology, Jinling Hospital, School of Medicine, Nanjing University, Nanjing 210002, China
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Leonard B, Hart SN, Burns MB, Carpenter MA, Temiz NA, Rathore A, Vogel RI, Nikas JB, Law EK, Brown WL, Li Y, Zhang Y, Maurer MJ, Oberg AL, Cunningham JM, Shridhar V, Bell DA, April C, Bentley D, Bibikova M, Cheetham RK, Fan JB, Grocock R, Humphray S, Kingsbury Z, Peden J, Chien J, Swisher EM, Hartmann LC, Kalli KR, Goode EL, Sicotte H, Kaufmann SH, Harris RS. APOBEC3B upregulation and genomic mutation patterns in serous ovarian carcinoma. Cancer Res 2013; 73:7222-31. [PMID: 24154874 DOI: 10.1158/0008-5472.can-13-1753] [Citation(s) in RCA: 134] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Ovarian cancer is a clinically and molecularly heterogeneous disease. The driving forces behind this variability are unknown. Here, we report wide variation in the expression of the DNA cytosine deaminase APOBEC3B, with elevated expression in the majority of ovarian cancer cell lines (three SDs above the mean of normal ovarian surface epithelial cells) and high-grade primary ovarian cancers. APOBEC3B is active in the nucleus of several ovarian cancer cell lines and elicits a biochemical preference for deamination of cytosines in 5'-TC dinucleotides. Importantly, examination of whole-genome sequence from 16 ovarian cancers reveals that APOBEC3B expression correlates with total mutation load as well as elevated levels of transversion mutations. In particular, high APOBEC3B expression correlates with C-to-A and C-to-G transversion mutations within 5'-TC dinucleotide motifs in early-stage high-grade serous ovarian cancer genomes, suggesting that APOBEC3B-catalyzed genomic uracil lesions are further processed by downstream DNA "repair" enzymes including error-prone translesion polymerases. These data identify a potential role for APOBEC3B in serous ovarian cancer genomic instability.
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Affiliation(s)
- Brandon Leonard
- Authors' Affiliations: Biochemistry, Molecular Biology and Biophysics Department; Masonic Cancer Center, University of Minnesota, Minneapolis; Division of Biomedical Statistics and Informatics, Department of Health Sciences Research; Medical Genome Facility and Department of Laboratory Medicine and Pathology; Department of Laboratory Medicine and Pathology; Division of Medical Oncology, Department of Oncology; Division of Epidemiology, Department of Health Sciences Research; Division of Oncology Research, Department of Oncology; Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic; Women's Cancer Program, Mayo Clinic Cancer Center, Rochester, Minnesota; Department of Cancer Biology, University of Kansas, Kansas City, Kansas; Department of Obstetrics & Gynecology, University of Washington School of Medicine, Seattle, Washington; and Illumina Cambridge Ltd, Chesterford Research Park, Little Chesterford, Cambridge, United Kingdom
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