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The Role of Phosphatidylinositol 3-Kinase Catalytic Subunit Type 3 in the Pathogenesis of Human Cancer. Int J Mol Sci 2021; 22:ijms222010964. [PMID: 34681622 PMCID: PMC8535862 DOI: 10.3390/ijms222010964] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 10/02/2021] [Accepted: 10/08/2021] [Indexed: 12/12/2022] Open
Abstract
Phosphatidylinositol 3-kinase catalytic subunit type 3 (PIK3C3), the mammalian ortholog of yeast vesicular protein sorting 34 (Vps34), belongs to the phosphoinositide 3-kinase (PI3K) family. PIK3C3 can phosphorylate phosphatidylinositol (PtdIns) to generate phosphatidylinositol 3-phosphate (PI3P), a phospholipid central to autophagy. Inhibition of PIK3C3 successfully inhibits autophagy. Autophagy maintains cell survival when modifications occur in the cellular environment and helps tumor cells resist metabolic stress and cancer treatment. In addition, PIK3C3 could induce oncogenic transformation and enhance tumor cell proliferation, growth, and invasion through mechanisms independent of autophagy. This review addresses the structural and functional features, tissue distribution, and expression pattern of PIK3C3 in a variety of human tumors and highlights the underlying mechanisms involved in carcinogenesis. The implications in cancer biology, patient prognosis prediction, and cancer therapy are discussed. Altogether, the discovery of pharmacological inhibitors of PIK3C3 could reveal novel strategies for improving treatment outcomes for PIK3C3-mediated human diseases.
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2
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Mandhair HK, Novak U, Radpour R. Epigenetic regulation of autophagy: A key modification in cancer cells and cancer stem cells. World J Stem Cells 2021; 13:542-567. [PMID: 34249227 PMCID: PMC8246247 DOI: 10.4252/wjsc.v13.i6.542] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 05/02/2021] [Accepted: 06/04/2021] [Indexed: 02/06/2023] Open
Abstract
Aberrant epigenetic alterations play a decisive role in cancer initiation and propagation via the regulation of key tumor suppressor genes and oncogenes or by modulation of essential signaling pathways. Autophagy is a highly regulated mechanism required for the recycling and degradation of surplus and damaged cytoplasmic constituents in a lysosome dependent manner. In cancer, autophagy has a divergent role. For instance, autophagy elicits tumor promoting functions by facilitating metabolic adaption and plasticity in cancer stem cells (CSCs) and cancer cells. Moreover, autophagy exerts pro-survival mechanisms to these cancerous cells by influencing survival, dormancy, immunosurveillance, invasion, metastasis, and resistance to anti-cancer therapies. In addition, recent studies have demonstrated that various tumor suppressor genes and oncogenes involved in autophagy, are tightly regulated via different epigenetic modifications, such as DNA methylation, histone modifications and non-coding RNAs. The impact of epigenetic regulation of autophagy in cancer cells and CSCs is not well-understood. Therefore, uncovering the complex mechanism of epigenetic regulation of autophagy provides an opportunity to improve and discover novel cancer therapeutics. Subsequently, this would aid in improving clinical outcome for cancer patients. In this review, we provide a comprehensive overview of the existing knowledge available on epigenetic regulation of autophagy and its importance in the maintenance and homeostasis of CSCs and cancer cells.
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Affiliation(s)
- Harpreet K Mandhair
- Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3008, Switzerland
| | - Urban Novak
- Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3008, Switzerland
| | - Ramin Radpour
- Department for BioMedical Research, University of Bern, Bern 3008, Switzerland
- Department of Medical Oncology, Inselspital, Bern University Hospital, University of Bern, Bern 3008, Switzerland
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3
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Comparative genomics of CXCR4MUT and CXCR4WT single cells in Waldenström's macroglobulinemia. Blood Adv 2021; 4:4550-4553. [PMID: 32956451 DOI: 10.1182/bloodadvances.2020001775] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Accepted: 08/04/2020] [Indexed: 12/30/2022] Open
Abstract
Key Points
Single-cell whole-genome amplification can be used to interrogate the genomic architecture of Waldenström’s macroglobulinemia. The mutational signature of CXCR4MUT cells may be associated with alterations in DNA repairing genes and tumor suppressors.
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4
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Yang Y, Feng M, Bai L, Zhang M, Zhou K, Liao W, Lei W, Zhang N, Huang J, Li Q. The Effects of Autophagy-Related Genes and lncRNAs in Therapy and Prognosis of Colorectal Cancer. Front Oncol 2021; 11:582040. [PMID: 33777735 PMCID: PMC7991845 DOI: 10.3389/fonc.2021.582040] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 02/02/2021] [Indexed: 02/05/2023] Open
Abstract
Cellular autophagy plays an important role in the occurrence and development of colorectal cancer (CRC). Whether autophagy-related genes and lncRNAs can be used as ideal markers in CRC is still controversial. The purpose of this study is to identify novel treatment and prognosis markers of CRC. We downloaded transcription and clinical data of CRC from the GEO (GSE40967, GSE12954, GSE17536) and TCGA database, screened for differentially autophagy-related genes (DEAGs) and lncRNAs, constructed prognostic model, and analyzed its relationship with immune infiltration. TCGA and GEO datasets (GSE12954 and GSE17536) were used to validate the effect of the model. Oncomine database and Human Protein Atlas verified the expression of DEAGs. We obtained a total of 151 DEAGs in three verification sets collaboratively. Then we constructed a risk prognostic model through Lasso regression to obtain 15 prognostic DEAGs from the training set and verified the risk prognostic model in three verification sets. The low-risk group survived longer than the high-risk group. Age, gender, pathological stage, and TNM stage were related to the prognostic risk of CRC. On the other hand, BRAF status, RFS event, and tumor location are considered as most significant risk factors of CRC in the training set. Furthermore, we found that the immune score of the low-risk group was higher. The content of CD8 + T cells, active NK cells, macrophages M0, macrophages M1, and active dendritic cells was noted more in the high-risk group. The content of plasma cells, resting memory CD4 + T cells, resting NK cells, resting mast cells, and neutrophil cells was higher in the low-risk group. After all, the Oncomine database and immunohistochemistry verified that the expression level of most key autophagy-related genes was consistent with the results that we found. In addition, we obtained six lncRNAs co-expressed with DEAGs from the training set and found that the survival time was longer in the low-risk group. This finding was verified in the verification set and showed same trend to the results mentioned above. In the final analysis, these results indicate that autophagy-related genes and lncRNAs can be used as prognostic and therapeutic markers for CRC.
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Affiliation(s)
- Yang Yang
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Sichuan, China.,West China Biomedical Big Data Center, Sichuan University, Sichuan, China
| | - Mingyang Feng
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Sichuan, China.,West China Biomedical Big Data Center, Sichuan University, Sichuan, China
| | - LiangLiang Bai
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Sichuan, China.,West China Biomedical Big Data Center, Sichuan University, Sichuan, China
| | - Mengxi Zhang
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Sichuan, China.,West China Biomedical Big Data Center, Sichuan University, Sichuan, China
| | - Kexun Zhou
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Sichuan, China.,West China Biomedical Big Data Center, Sichuan University, Sichuan, China
| | - Weiting Liao
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Sichuan, China.,West China Biomedical Big Data Center, Sichuan University, Sichuan, China
| | - Wanting Lei
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Sichuan, China.,West China Biomedical Big Data Center, Sichuan University, Sichuan, China
| | - Nan Zhang
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Sichuan, China.,West China Biomedical Big Data Center, Sichuan University, Sichuan, China
| | - Jiaxing Huang
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Sichuan, China.,West China Biomedical Big Data Center, Sichuan University, Sichuan, China
| | - Qiu Li
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Sichuan, China.,West China Biomedical Big Data Center, Sichuan University, Sichuan, China
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5
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Wang J, Wang X, Liu K, Gu L, Yu L, Han L, Meng Z. Suppressing UVRAG Induces Radiosensitivity by Triggering Lysosomal Membrane Permeabilization in Hypopharyngeal Squamous Cell Carcinoma. Onco Targets Ther 2020; 13:10275-10285. [PMID: 33116608 PMCID: PMC7568628 DOI: 10.2147/ott.s270433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 09/20/2020] [Indexed: 12/16/2022] Open
Abstract
Introduction Radiotherapy is one of the most important methods in the treatment of patients with hypopharyngeal squamous cell carcinoma (HSCC). However, radioresistance will be developed after repeated irradiation. Among many key factors contributing to radioresistance, enhanced autophagy is recognized as one of the most important. The ultraviolent irradiation resistance-associated gene (UVRAG) is reported to be a crucial gene involved in the process of autophagy. Here, we test whether UVRAG has effect on the radioresistance of HSCC. Methods HSCC cell line Fadu cells were treated with irradiation to test levels of autophagy. Tumor tissues from primary and recurrent HSCC patients were tested by immunohistochemistry. Then, we knocked down UVRAG to test its role in cell growth and the malignant behaviors. Response of cells to treatment was examined using LDH release assay, immunofluorescence, Western blot analysis and colony formation. Results We found that irradiation induced autophagy in Fadu cells. Immunohistochemistry of primary and irradiated HSCC tumor tissues showed that UVRAG was upregulated after irradiation treatment. Inhibiting UVRAG with siRNA interfered cell growth, cell cycle, malignant behaviors and autophagic flux in Fadu cells. Knocking down UVRAG increased DNA damage and cell death induced by irradiation. Finally, we found that inhibiting UVRAG induced lysosomal membrane permeabilization, which contributed to radiosensitization of Fadu cells. Conclusion Our findings supported the oncogenic properties of UVRAG in HSCC and inhibiting UVRAG increased radiosensitivity in HSCC by triggering lysosomal membrane permeabilization. Therefore, UVRAG might be a promising target in the treatment of HSCC.
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Affiliation(s)
- Jianwen Wang
- Department of Otolaryngology, Weihai Municipal Hospital, Cheeloo College of Medicine, Shandong University, Weihai 264200, Shandong, People's Republic of China
| | - Xuehai Wang
- Department of Otolaryngology, Weihai Municipal Hospital, Cheeloo College of Medicine, Shandong University, Weihai 264200, Shandong, People's Republic of China
| | - Kai Liu
- Department of Otolaryngology, Weihai Municipal Hospital, Cheeloo College of Medicine, Shandong University, Weihai 264200, Shandong, People's Republic of China
| | - Li Gu
- Department of Otolaryngology, Weihai Municipal Hospital, Cheeloo College of Medicine, Shandong University, Weihai 264200, Shandong, People's Republic of China
| | - Lei Yu
- Department of Otolaryngology, Weihai Municipal Hospital, Cheeloo College of Medicine, Shandong University, Weihai 264200, Shandong, People's Republic of China
| | - Li Han
- Department of Otolaryngology, Weihai Municipal Hospital, Cheeloo College of Medicine, Shandong University, Weihai 264200, Shandong, People's Republic of China
| | - Zhaojin Meng
- Department of Otolaryngology, Weihai Municipal Hospital, Cheeloo College of Medicine, Shandong University, Weihai 264200, Shandong, People's Republic of China
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6
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Epigenetic Control of Autophagy in Cancer Cells: A Key Process for Cancer-Related Phenotypes. Cells 2019; 8:cells8121656. [PMID: 31861179 PMCID: PMC6952790 DOI: 10.3390/cells8121656] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 11/19/2019] [Accepted: 12/13/2019] [Indexed: 02/06/2023] Open
Abstract
Although autophagy is a well-known and extensively described cell pathway, numerous studies have been recently interested in studying the importance of its regulation at different molecular levels, including the translational and post-translational levels. Therefore, this review focuses on the links between autophagy and epigenetics in cancer and summarizes the. following: (i) how ATG genes are regulated by epigenetics, including DNA methylation and post-translational histone modifications; (ii) how epidrugs are able to modulate autophagy in cancer and to alter cancer-related phenotypes (proliferation, migration, invasion, tumorigenesis, etc.) and; (iii) how epigenetic enzymes can also regulate autophagy at the protein level. One noteable observation was that researchers most often reported conclusions about the regulation of the autophagy flux, following the use of epidrugs, based only on the analysis of LC3B-II form in treated cells. However, it is now widely accepted that an increase in LC3B-II form could be the consequence of an induction of the autophagy flux, as well as a block in the autophagosome-lysosome fusion. Therefore, in our review, all the published results describing a link between epidrugs and autophagy were systematically reanalyzed to determine whether autophagy flux was indeed increased, or inhibited, following the use of these potentially new interesting treatments targeting the autophagy process. Altogether, these recent data strongly support the idea that the determination of autophagy status could be crucial for future anticancer therapies. Indeed, the use of a combination of epidrugs and autophagy inhibitors could be beneficial for some cancer patients, whereas, in other cases, an increase of autophagy, which is frequently observed following the use of epidrugs, could lead to increased autophagy cell death.
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7
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Annunziata I, van de Vlekkert D, Wolf E, Finkelstein D, Neale G, Machado E, Mosca R, Campos Y, Tillman H, Roussel MF, Andrew Weesner J, Ellen Fremuth L, Qiu X, Han MJ, Grosveld GC, d'Azzo A. MYC competes with MiT/TFE in regulating lysosomal biogenesis and autophagy through an epigenetic rheostat. Nat Commun 2019; 10:3623. [PMID: 31399583 PMCID: PMC6689058 DOI: 10.1038/s41467-019-11568-0] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 07/17/2019] [Indexed: 12/14/2022] Open
Abstract
Coordinated regulation of the lysosomal and autophagic systems ensures basal catabolism and normal cell physiology, and failure of either system causes disease. Here we describe an epigenetic rheostat orchestrated by c-MYC and histone deacetylases that inhibits lysosomal and autophagic biogenesis by concomitantly repressing the expression of the transcription factors MiT/TFE and FOXH1, and that of lysosomal and autophagy genes. Inhibition of histone deacetylases abates c-MYC binding to the promoters of lysosomal and autophagy genes, granting promoter occupancy to the MiT/TFE members, TFEB and TFE3, and/or the autophagy regulator FOXH1. In pluripotent stem cells and cancer, suppression of lysosomal and autophagic function is directly downstream of c-MYC overexpression and may represent a hallmark of malignant transformation. We propose that, by determining the fate of these catabolic systems, this hierarchical switch regulates the adaptive response of cells to pathological and physiological cues that could be exploited therapeutically. Genes related to lysosomal and autophagic systems are transcriptionally regulated by the Mit/TFE family of transcription factors. Here the authors show that MYC, in association with HDACs, suppresses the expression of lysosomal and autophagy genes by competing with the Mit/TFE transcription factors for occupancy of their target gene promoters.
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Affiliation(s)
- Ida Annunziata
- Department of Genetics, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | | | - Elmar Wolf
- Department of Biochemistry and Molecular Biology, Biocenter, University of Würzburg, Würzburg, 97074, Germany
| | - David Finkelstein
- Department of Computational Biology, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Geoffrey Neale
- Hartwell Center, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Eda Machado
- Department of Genetics, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Rosario Mosca
- Department of Genetics, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Yvan Campos
- Department of Genetics, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Heather Tillman
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Martine F Roussel
- Department of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Jason Andrew Weesner
- Department of Genetics, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA.,Department of Anatomy and Neurobiology, College of Graduate Health Sciences, University of Tennessee Health Science Center, Memphis, TN, 38163, USA
| | - Leigh Ellen Fremuth
- Department of Genetics, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA.,Department of Anatomy and Neurobiology, College of Graduate Health Sciences, University of Tennessee Health Science Center, Memphis, TN, 38163, USA
| | - Xiaohui Qiu
- Department of Genetics, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Min-Joon Han
- Department of Hematology, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Gerard C Grosveld
- Department of Genetics, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Alessandra d'Azzo
- Department of Genetics, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA.
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8
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Chokeshaiusaha K, Puthier D, Nguyen C, Sudjaidee P, Sananmuang T. Factor Analysis for Bicluster Acquisition (FABIA) revealed vincristine-sensitive transcript pattern of canine transmissible venereal tumors. Heliyon 2019; 5:e01558. [PMID: 31193204 PMCID: PMC6520609 DOI: 10.1016/j.heliyon.2019.e01558] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 03/25/2019] [Accepted: 04/18/2019] [Indexed: 12/21/2022] Open
Abstract
Chemotherapeutic treatment for Canine transmissible venereal tumor (CTVT) commonly relies on vincristine administration. Since the treatment outcomes can vary among CTVT cases, gaining insight into the tumor cell mechanisms influencing vincristine's potency should render veterinarians novel knowledge to enhance its therapeutic effect. This study aimed to attain such knowledge from a meta-analysis of CTVT mRNA sequencing (mRNA-seq) transcriptome data using Factor Analysis for Bicluster Acquisition (FABIA) biclustering. FABIA biclustering identified 459 genes consistently expressed among mRNA-seq transcription profiling of CTVT samples regressed by vincristine. These genes were also differentially expressed from those of progressive CTVT (FDR ≤ 0.001). Enrichment analysis illustrated the affiliation of these genes with "Antigen presentation" and "Lysosome" GO terms (FDR ≤ 0.05). Several genes in "Lysosome" term involved 5 cell mechanisms-antigen presentation, autophagy, cell-adhesion, lysosomal membrane permeabilization (LMP), and PI3K/mTOR signaling. This study integrated FABIA biclustering in CTVT transcriptome analysis to gain insight into cell mechanisms responsible for vincristine-sensitive characteristics of the tumor, in order to identify new molecular targets augmenting therapeutic effect of vincristine. Interestingly, the analysis indicated LMP targeting by lysosome destabilizing agent-siramesine as the promising vincristine's enhancer for future study. As far as we know, this is the first canine tumor transcriptomic meta-analysis applying FABIA biclustering for the betterment of future CTVT therapy. This study hereby provided an interesting manifestation to acquire such knowledge in other canine neoplasia.
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Affiliation(s)
- K. Chokeshaiusaha
- Department of Veterinary Science, Faculty of Veterinary Medicine, Rajamangala University of Technology Tawan-OK, Chonburi, Thailand
| | - D. Puthier
- Aix Marseille Univ, TAGC INSERM UMR 1090, Marseille, France
| | - C. Nguyen
- Aix Marseille Univ, TAGC INSERM UMR 1090, Marseille, France
| | - P. Sudjaidee
- Department of Veterinary Science, Faculty of Veterinary Medicine, Rajamangala University of Technology Tawan-OK, Chonburi, Thailand
| | - T. Sananmuang
- Department of Veterinary Science, Faculty of Veterinary Medicine, Rajamangala University of Technology Tawan-OK, Chonburi, Thailand
- Corresponding author.
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9
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Sui Y, Wu T, Li F, Wang F, Cai Y, Jin J. YY1/BCCIP Coordinately Regulates P53-Responsive Element (p53RE)-Mediated Transactivation of p21 Waf1/Cip1. Int J Mol Sci 2019; 20:ijms20092095. [PMID: 31035388 PMCID: PMC6539464 DOI: 10.3390/ijms20092095] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 04/25/2019] [Accepted: 04/26/2019] [Indexed: 12/26/2022] Open
Abstract
Transactivation of p21 (cyclin-dependent kinase inhibitor 1A, CDKN1A) is closely related to the recruitment of transcription cofactors at the p53 responsive elements (p53REs) in its promoter region. Human chromatin remodeling enzyme INO80 can be recruited to the p53REs of p21 promoter and negatively regulates p21. As one of the key subunits of the INO80 complex, YY1 has also been confirmed to bind to the p53RE sites of p21 promoter. Importantly, YY1 was recently reported to be bound and stabilized by BCCIP (BRCA2 and CDKN1A-interacting protein). Therefore, we hypothesized that the YY1/BCCIP complex plays an important role in regulating the transactivation of p21. Here we present evidence that the YY1/BCCIP complex coordinatively regulates p53RE-mediated p21 transactivation. We first confirmed the cross-interaction between YY1, BCCIP, and p53, suggesting an intrinsic link between three proteins in the regulation of p21 transcription. In dual luciferase assays, YY1 inhibited p53RE-mediated luciferase activity, whereas BCCIP revealed the opposite effect. More interestingly, the region 146–270 amino acids of YY1, which bound to BCCIP, increased p53-mediated luciferase activity, indicating the complexity of the YY1/BCCIP complex in co-regulating p21 transcription. Further in-depth research confirmed the co-occupancy of YY1/BCCIP with p53 at the p53RE-proximal region of p21. Lentiviral-mediated knockdown of BCCIP inhibited the recruitment of p53 and YY1 at the p53RE proximal region of p21; however, this phenomenon was reversed by expressing exogenous YY1, suggesting the collaborative regulation of YY1/BCCIP complex in p53RE-mediated p21 transcription. These data provide new insights into the transcriptional regulation of p21 by the YY1/BCCIP complex.
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Affiliation(s)
- Yi Sui
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Jilin University, Changchun 130012, China.
| | - Tingting Wu
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Jilin University, Changchun 130012, China.
| | - Fuqiang Li
- School of Pharmacy, Changchun University of Chinese Medicine, Changchun 130117, China.
| | - Fei Wang
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Jilin University, Changchun 130012, China.
| | - Yong Cai
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Jilin University, Changchun 130012, China.
- National Engineering Laboratory for AIDS Vaccine, School of Life Sciences, Jilin University, Changchun 130012, China.
- Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun 130012, China.
| | - Jingji Jin
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Jilin University, Changchun 130012, China.
- National Engineering Laboratory for AIDS Vaccine, School of Life Sciences, Jilin University, Changchun 130012, China.
- Key Laboratory for Molecular Enzymology and Engineering, the Ministry of Education, Jilin University, Changchun 130012, China.
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10
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Yang C, Wu S, Wu X, Zhou X, Jin S, Jiang H. Silencing circular RNA UVRAG inhibits bladder cancer growth and metastasis by targeting the microRNA-223/fibroblast growth factor receptor 2 axis. Cancer Sci 2018; 110:99-106. [PMID: 30387298 PMCID: PMC6317955 DOI: 10.1111/cas.13857] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 10/29/2018] [Accepted: 10/30/2018] [Indexed: 12/19/2022] Open
Abstract
Circular RNA UVRAG (circUVRAG), a type of non-coding RNA, is derived and cyclized by part of the exon from the UVRAG gene. However, the role of circUVRAG in bladder cancer (BLCA) has not been reported. The purpose of the present study was therefore to characterize the role of circUVRAG in BLCA. Bioinformatics analysis showed interactive relationships among circUVRAG, microRNA-223 (miR-223), and fibroblast growth factor receptor 2 (FGFR2). Quantitative real-time PCR was used to detect the expression of circUVRAG in BLCA cell lines. UM-UC-3 cells were stably transfected with siRNA against circUVRAG, and cell proliferation and migration ability were tested using the CCK8 assay, clone formation, and Transwell assays in vitro. Tumor xenograft formation and metastasis were determined using nude mice. Fluorescence in situ hybridization was used to confirm the subcellular localization of circUVRAG, and the luciferase reporter assay was used to confirm the relationships among circUVRAG, miR-223, and FGFR2. Results showed that circUVRAG was upregulated in BLCA cell lines. Downregulation of circUVRAG expression suppressed proliferation and metastasis both in vitro and in vivo. Downregulation of circUVRAG suppressed FGFR2 expression by "sponging" miR-223, which was confirmed by rescue experiments and luciferase reporter assay. Overall, the results showed that downregulation of circUVRAG suppressed the aggressive biological phenotype of BLCA. Taken together, silencing circular RNA UVRAG inhibited bladder cancer growth and metastasis by targeting the miR-223/FGFR2 axis, which may provide a potential biomarker and therapeutic target for the management of BLCA.
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Affiliation(s)
- Chen Yang
- Department of Urology, Huashan Hospital, Fudan University, Shanghai, China.,Fudan Institute of Urology, Huashan Hospital, Fudan University, Shanghai, China
| | - Siqi Wu
- Department of Urology, Huashan Hospital, Fudan University, Shanghai, China.,Fudan Institute of Urology, Huashan Hospital, Fudan University, Shanghai, China
| | - Xiaobo Wu
- Department of Urology, Huashan Hospital, Fudan University, Shanghai, China.,Fudan Institute of Urology, Huashan Hospital, Fudan University, Shanghai, China
| | - Xuejian Zhou
- Department of Urology, The Fifth People's Hospital of Shanghai, Shanghai, China
| | - Shengming Jin
- Fudan University Shanghai Cancer Center, Shanghai, China
| | - Haowen Jiang
- Department of Urology, Huashan Hospital, Fudan University, Shanghai, China.,Fudan Institute of Urology, Huashan Hospital, Fudan University, Shanghai, China
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11
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Genetic and Epigenetic Control of CDKN1C Expression: Importance in Cell Commitment and Differentiation, Tissue Homeostasis and Human Diseases. Int J Mol Sci 2018; 19:ijms19041055. [PMID: 29614816 PMCID: PMC5979523 DOI: 10.3390/ijms19041055] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 03/31/2018] [Accepted: 03/31/2018] [Indexed: 12/28/2022] Open
Abstract
The CDKN1C gene encodes the p57Kip2 protein which has been identified as the third member of the CIP/Kip family, also including p27Kip1 and p21Cip1. In analogy with these proteins, p57Kip2 is able to bind tightly and inhibit cyclin/cyclin-dependent kinase complexes and, in turn, modulate cell division cycle progression. For a long time, the main function of p57Kip2 has been associated only to correct embryogenesis, since CDKN1C-ablated mice are not vital. Accordingly, it has been demonstrated that CDKN1C alterations cause three human hereditary syndromes, characterized by altered growth rate. Subsequently, the p57Kip2 role in several cell phenotypes has been clearly assessed as well as its down-regulation in human cancers. CDKN1C lies in a genetic locus, 11p15.5, characterized by a remarkable regional imprinting that results in the transcription of only the maternal allele. The control of CDKN1C transcription is also linked to additional mechanisms, including DNA methylation and specific histone methylation/acetylation. Finally, long non-coding RNAs and miRNAs appear to play important roles in controlling p57Kip2 levels. This review mostly represents an appraisal of the available data regarding the control of CDKN1C gene expression. In addition, the structure and function of p57Kip2 protein are briefly described and correlated to human physiology and diseases.
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