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Zhou J, Zhang M, Gao A, Herman JG, Guo M. Epigenetic silencing of KCTD8 promotes hepatocellular carcinoma growth by activating PI3K/AKT signaling. Epigenomics 2024:1-16. [PMID: 39023358 DOI: 10.1080/17501911.2024.2370590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Accepted: 06/14/2024] [Indexed: 07/20/2024] Open
Abstract
Aim: The aim of current study is to explore the epigenetic changes and function of KCTD8 in human hepatocellular carcinoma (HCC). Materials & methods: HCC cell lines and tissue samples were employed. Methylation specific PCR, flow cytometry, immunoprecipitation and xenograft mouse models were used. Results: KCTD8 was methylated in 44.83% (104/232) of HCC and its methylation may act as an independent poor prognostic marker. KCTD8 expression was regulated by DNA methylation. KCTD8 suppressed HCC cell growth both in vitro and in vivo via inhibiting PI3K/AKT pathway. Conclusion: Methylation of KCTD8 is an independent poor prognostic marker, and epigenetic silencing of KCTD8 increases the malignant tendency in HCC.
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Affiliation(s)
- Jing Zhou
- School of Medicine, NanKai University, Tianjin, 300071, China
- Department of Gastroenterology & Hepatology, the First Medical Center, Chinese PLA General Hospital, Beijing, 100853, China
| | - Meiying Zhang
- Department of Gastroenterology & Hepatology, the First Medical Center, Chinese PLA General Hospital, Beijing, 100853, China
| | - Aiai Gao
- Department of Gastroenterology & Hepatology, the First Medical Center, Chinese PLA General Hospital, Beijing, 100853, China
| | - James G Herman
- The Hillman Cancer Center, University of Pittsburgh Cancer Institute, Pittsburgh, PA 15213, USA
| | - Mingzhou Guo
- School of Medicine, NanKai University, Tianjin, 300071, China
- Department of Gastroenterology & Hepatology, the First Medical Center, Chinese PLA General Hospital, Beijing, 100853, China
- National Key Laboratory of Kidney Diseases, Beijing, 100853, China
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2
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Ding XJ, Cai XM, Wang QQ, Liu N, Zhong WL, Xi XN, Lu YX. Vitexicarpin suppresses malignant progression of colorectal cancer through affecting c-Myc ubiquitination by targeting IMPDH2. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 132:155833. [PMID: 39008915 DOI: 10.1016/j.phymed.2024.155833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 06/05/2024] [Accepted: 06/19/2024] [Indexed: 07/17/2024]
Abstract
BACKGROUND Colorectal cancer (CRC) is the second most common cause of cancer-related mortality and is characterised by extensive invasive and metastatic potential. Previous studies have shown that vitexicarpin extracted from the fruits of Vitex rotundifolia can impede tumour progression. However, the molecular mechanisms involved in CRC treatment are still not fully established. PURPOSE Our study aimed to investigate the anticancer activity, targets, and molecular mechanisms of vitexicarpin in CRC hoping to provide novel therapies for patients with CRC. STUDY DESIGN/METHODS The impact of vitexicarpin on CRC was assessed through various experiments including MTT, clone formation, EDU, cell cycle, and apoptosis assays, as well as a tumour xenograft model. CETSA, label-free quantitative proteomics, and Biacore were used to identify the vitexicarpin targets. WB, Co-IP, Ubiquitination assay, IF, molecular docking, MST, and cell transfection were used to investigate the mechanism of action of vitexicarpin in CRC cells. Furthermore, we analysed the expression patterns and correlation of target proteins in TCGA and GEPIA datasets and clinical samples. Finally, wound healing, Transwell, tail vein injection model, and tissue section staining were used to demonstrate the antimetastatic effect of vitexicarpin on CRC in vitro and in vivo. RESULTS Our findings demonstrated that vitexicarpin exhibits anticancer activity by directly binding to inosine monophosphate dehydrogenase 2 (IMPDH2) and that it promotes c-Myc ubiquitination by disrupting the interaction between IMPDH2 and c-Myc, leading to epithelial-mesenchymal transition (EMT) inhibition. Vitexicarpin hinders the migration and invasion of CRC cells by reversing EMT both in vitro and in vivo. Additionally, these results were validated by the overexpression and knockdown of IMPDH2 in CRC cells. CONCLUSION These results demonstrated that vitexicarpin regulates the interaction between IMPDH2 and c-Myc to inhibit CRC proliferation and metastasis both in vitro and in vivo. These discoveries introduce potential molecular targets for CRC treatment and shed light on new mechanisms for c-Myc regulation in tumours.
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Affiliation(s)
- Xiao-Jing Ding
- College of Pharmacy, Nankai University, Tianjin 300350, PR China
| | - Xue-Mei Cai
- Huabei Petroleum Administration Bureau General Hospital, Renqiu 062550, PR China
| | - Qian-Qian Wang
- State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin 300350, PR China
| | - Ning Liu
- State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin 300350, PR China
| | - Wei-Long Zhong
- Department of Gastroenterology and Hepatology, Tianjin Medical University General Hospital, Tianjin Institute of Digestive Diseases, Tianjin Key Laboratory of Digestive Diseases, Tianjin 300052, PR China.
| | - Xiao-Nan Xi
- State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin 300350, PR China.
| | - Ya-Xin Lu
- State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin 300350, PR China; College of Chemistry, Nankai University, Tianjin 300350, PR China.
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Huang Y, Chan S, Chen S, Liu X, Li M, Zheng L, Dong Z, Yang Z, Liu Z, Zhou D, Zhang X, Zhang B. Wnt/β-catenin signalling activates IMPDH2-mediated purine metabolism to facilitate oxaliplatin resistance by inhibiting caspase-dependent apoptosis in colorectal cancer. J Transl Med 2024; 22:133. [PMID: 38310229 PMCID: PMC10838440 DOI: 10.1186/s12967-024-04934-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 01/26/2024] [Indexed: 02/05/2024] Open
Abstract
BACKGROUND Oxaliplatin resistance usually leads to therapeutic failure and poor prognosis in colorectal cancer (CRC), while the underlying mechanisms are not yet fully understood. Metabolic reprogramming is strongly linked to drug resistance, however, the role and mechanism of metabolic reprogramming in oxaliplatin resistance remain unclear. Here, we aim to explore the functions and mechanisms of purine metabolism on the oxaliplatin-induced apoptosis of CRC. METHODS An oxaliplatin-resistant CRC cell line was generated, and untargeted metabolomics analysis was conducted. The inosine 5'-monophosphate dehydrogenase type II (IMPDH2) expression in CRC cell lines was determined by quantitative real-time polymerase chain reaction (qPCR) and western blotting analysis. The effects of IMPDH2 overexpression, knockdown and pharmacological inhibition on oxaliplatin resistance in CRC were assessed by flow cytometry analysis of cell apoptosis in vivo and in vitro. RESULTS Metabolic analysis revealed that the levels of purine metabolites, especially guanosine monophosphate (GMP), were markedly elevated in oxaliplatin-resistant CRC cells. The accumulation of purine metabolites mainly arose from the upregulation of IMPDH2 expression. Gene set enrichment analysis (GSEA) indicated high IMPDH2 expression in CRC correlates with PURINE_METABOLISM and MULTIPLE-DRUG-RESISTANCE pathways. CRC cells with higher IMPDH2 expression were more resistant to oxaliplatin-induced apoptosis. Overexpression of IMPDH2 in CRC cells resulted in reduced cell death upon treatment with oxaliplatin, whereas knockdown of IMPDH2 led to increased sensitivity to oxaliplatin through influencing the activation of the Caspase 7/8/9 and PARP1 proteins on cell apoptosis. Targeted inhibition of IMPDH2 by mycophenolic acid (MPA) or mycophenolate mofetil (MMF) enhanced cell apoptosis in vitro and decreased in vivo tumour burden when combined with oxaliplatin treatment. Mechanistically, the Wnt/β-catenin signalling was hyperactivated in oxaliplatin-resistant CRC cells, and a reciprocal positive regulatory mechanism existed between Wnt/β-catenin and IMPDH2. Blocking the Wnt/β-catenin pathway could resensitize resistant cells to oxaliplatin, which could be restored by the addition of GMP. CONCLUSIONS IMPDH2 is a predictive biomarker and therapeutic target for oxaliplatin resistance in CRC.
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Affiliation(s)
- Yuting Huang
- Department of Interventional Center, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
- Biomedical Innovation Center, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Szehoi Chan
- Shenzhen Key Laboratory for Systems Medicine in Inflammatory Diseases, School of Medicine, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen, China
| | - Shuna Chen
- Shenzhen Key Laboratory for Systems Medicine in Inflammatory Diseases, School of Medicine, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen, China
| | - Xueqi Liu
- Shenzhen Key Laboratory for Systems Medicine in Inflammatory Diseases, School of Medicine, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen, China
| | - Miao Li
- Department of Dermatovenereology, The Seventh Affiliated Hospital, Sun Yat-Sen University, Shenzhen, China
| | - Liyuan Zheng
- Dongguan Key Laboratory of Medical Bioactive Molecular Developmental and Translational Research, Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics, Guangdong Medical University, Dongguan, China
| | - Zhaoxia Dong
- Shenzhen Key Laboratory for Systems Medicine in Inflammatory Diseases, School of Medicine, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen, China
| | - Ziyi Yang
- Shenzhen Key Laboratory for Systems Medicine in Inflammatory Diseases, School of Medicine, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen, China
| | - Zixuan Liu
- Shenzhen Key Laboratory for Systems Medicine in Inflammatory Diseases, School of Medicine, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen, China
| | - Disheng Zhou
- Shenzhen Key Laboratory for Systems Medicine in Inflammatory Diseases, School of Medicine, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen, China
| | - Xingding Zhang
- Shenzhen Key Laboratory for Systems Medicine in Inflammatory Diseases, School of Medicine, Shenzhen Campus of Sun Yat-Sen University, Sun Yat-Sen University, Shenzhen, China.
| | - Bo Zhang
- Department of Interventional Center, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China.
- Biomedical Innovation Center, The Sixth Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China.
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Alhamad S, Elmasry Y, Uwagboe I, Chekmeneva E, Sands C, Cooper BW, Camuzeaux S, Salam A, Parsons M. B7-H3 Associates with IMPDH2 and Regulates Cancer Cell Survival. Cancers (Basel) 2023; 15:3530. [PMID: 37444640 DOI: 10.3390/cancers15133530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 07/03/2023] [Accepted: 07/05/2023] [Indexed: 07/15/2023] Open
Abstract
Lung cancer is one of the most common cancers worldwide, and despite improvements in treatment regimens, patient prognosis remains poor. Lung adenocarcinomas develop from the lung epithelia and understanding how specific genetic and environmental factors lead to oncogenic transformation in these cells is of great importance to define the pathways that contribute to tumorigenesis. The recent rise in the use of immunotherapy to treat different cancers has prompted the exploration of immune modulators in tumour cells that may provide new targets to manipulate this process. Of these, the B7 family of cell surface receptors, which includes PD-1, is of particular interest due to its role in modulating immune cell responses within the tumour microenvironment. B7-H3 (CD276) is one family member that is upregulated in many cancer types and suggested to contribute to tumour-immune interactions. However, the function and ligand(s) for this receptor in normal lung epithelia and the mechanisms through which the overexpression of B7-H3 regulate cancer progression in the absence of immune cell interactions remain unclear. Here, we present evidence that B7-H3 is associated with one of the key rate-limiting metabolic enzymes IMPDH2, and the localisation of this complex is altered in human lung cancer cells that express high levels of B7-H3. Mechanistically, the IMPDH2:B7-H3 complex provides a protective role in cancer cells to escape oxidative stress triggered by chemotherapy, thus leading to cell survival. We further demonstrate that the loss of B7-H3 in cancer cells has no effect on growth or migration in 2D but promotes the expansion of 3D spheroids in an IMPDH2-dependent manner. These findings provide new insights into the B7-H3 function in the metabolic homeostasis of normal and transformed lung cancer cells, and whilst this molecule remains an interesting target for immunotherapy, these findings caution against the use of anti-B7-H3 therapies in certain clinical settings.
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Affiliation(s)
- Salwa Alhamad
- Randall Centre for Cell and Molecular Biophysics, King's College London, Guys Campus, New Hunts House, London SE1 1UL, UK
- Department of Biology, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia
| | - Yassmin Elmasry
- Randall Centre for Cell and Molecular Biophysics, King's College London, Guys Campus, New Hunts House, London SE1 1UL, UK
| | - Isabel Uwagboe
- Randall Centre for Cell and Molecular Biophysics, King's College London, Guys Campus, New Hunts House, London SE1 1UL, UK
| | - Elena Chekmeneva
- National Phenome Centre, Section of Bioanalytical Chemistry, Department of Metabolism, Digestion and Reproduction, Imperial College London, Hammersmith Hospital Campus, IRDB Building, 5th Floor, Du Cane Road, London W12 0NN, UK
| | - Caroline Sands
- National Phenome Centre, Section of Bioanalytical Chemistry, Department of Metabolism, Digestion and Reproduction, Imperial College London, Hammersmith Hospital Campus, IRDB Building, 5th Floor, Du Cane Road, London W12 0NN, UK
| | - Benjamin W Cooper
- National Phenome Centre, Section of Bioanalytical Chemistry, Department of Metabolism, Digestion and Reproduction, Imperial College London, Hammersmith Hospital Campus, IRDB Building, 5th Floor, Du Cane Road, London W12 0NN, UK
| | - Stephane Camuzeaux
- National Phenome Centre, Section of Bioanalytical Chemistry, Department of Metabolism, Digestion and Reproduction, Imperial College London, Hammersmith Hospital Campus, IRDB Building, 5th Floor, Du Cane Road, London W12 0NN, UK
| | - Ash Salam
- National Phenome Centre, Section of Bioanalytical Chemistry, Department of Metabolism, Digestion and Reproduction, Imperial College London, Hammersmith Hospital Campus, IRDB Building, 5th Floor, Du Cane Road, London W12 0NN, UK
| | - Maddy Parsons
- Randall Centre for Cell and Molecular Biophysics, King's College London, Guys Campus, New Hunts House, London SE1 1UL, UK
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Liu J, Hong S, Yang J, Zhang X, Wang Y, Wang H, Peng J, Hong L. Targeting purine metabolism in ovarian cancer. J Ovarian Res 2022; 15:93. [PMID: 35964092 PMCID: PMC9375293 DOI: 10.1186/s13048-022-01022-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 07/17/2022] [Indexed: 11/10/2022] Open
Abstract
Purine, an abundant substrate in organisms, is a critical raw material for cell proliferation and an important factor for immune regulation. The purine de novo pathway and salvage pathway are tightly regulated by multiple enzymes, and dysfunction in these enzymes leads to excessive cell proliferation and immune imbalance that result in tumor progression. Maintaining the homeostasis of purine pools is an effective way to control cell growth and tumor evolution, and exploiting purine metabolism to suppress tumors suggests interesting directions for future research. In this review, we describe the process of purine metabolism and summarize the role and potential therapeutic effects of the major purine-metabolizing enzymes in ovarian cancer, including CD39, CD73, adenosine deaminase, adenylate kinase, hypoxanthine guanine phosphoribosyltransferase, inosine monophosphate dehydrogenase, purine nucleoside phosphorylase, dihydrofolate reductase and 5,10-methylenetetrahydrofolate reductase. Purinergic signaling is also described. We then provide an overview of the application of purine antimetabolites, comprising 6-thioguanine, 6-mercaptopurine, methotrexate, fludarabine and clopidogrel. Finally, we discuss the current challenges and future opportunities for targeting purine metabolism in the treatment-relevant cellular mechanisms of ovarian cancer.
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Affiliation(s)
- Jingchun Liu
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Shasha Hong
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Jiang Yang
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Xiaoyi Zhang
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Ying Wang
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Haoyu Wang
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Jiaxin Peng
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Li Hong
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan, China.
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Entezari M, Ghanbarirad M, Taheriazam A, Sadrkhanloo M, Zabolian A, Goharrizi MASB, Hushmandi K, Aref AR, Ashrafizadeh M, Zarrabi A, Nabavi N, Rabiee N, Hashemi M, Samarghandian S. Long non-coding RNAs and exosomal lncRNAs: Potential functions in lung cancer progression, drug resistance and tumor microenvironment remodeling. Biomed Pharmacother 2022; 150:112963. [PMID: 35468579 DOI: 10.1016/j.biopha.2022.112963] [Citation(s) in RCA: 44] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 04/04/2022] [Accepted: 04/11/2022] [Indexed: 11/30/2022] Open
Abstract
Among the different kinds of tumors threatening human life, lung cancer is one that is commonly observed in both males and females. The aggressive behavior of lung cancer and interactions occurring in tumor microenvironment enhances the malignancy of this tumor. The lung tumor cells have demonstrated capacity in developing chemo- and radio-resistance. LncRNAs are a category of non-coding RNAs that do not encode proteins, but their aberrant expression is responsible for tumor development, especially lung cancer. In the present review, we focus on both lncRNAs and exosomal lncRNAs in lung cancer, and their ability in regulating proliferation and metastasis. Cell cycle progression and molecular mechanisms related to lung cancer metastasis such as EMT and MMPs are regulated by lncRNAs. LncRNAs interact with miRNAs, STAT, Wnt, EZH2, PTEN and PI3K/Akt signaling pathways to affect progression of lung cancer cells. LncRNAs demonstrate both tumor-suppressor and tumor-promoting functions in lung cancer. They can be considered as biomarkers in lung cancer and especially exosomal lncRNAs present in body fluids are potential tools for minimally invasive diagnosis. Furthermore, we discuss regulation of lncRNAs by anti-cancer drugs and genetic tools as well as the role of these factors in therapy response of lung cancer cells.
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Affiliation(s)
- Maliheh Entezari
- Department of Genetics, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran; Farhikhtegan Medical Convergence Sciences Research Center, Farhikhtegan Hospital Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Maryam Ghanbarirad
- Department of Genetics, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran; Farhikhtegan Medical Convergence Sciences Research Center, Farhikhtegan Hospital Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Afshin Taheriazam
- Farhikhtegan Medical Convergence Sciences Research Center, Farhikhtegan Hospital Tehran Medical Sciences, Islamic Azad University, Tehran, Iran; Department of Orthopedics, Faculty of Medicine, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | | | - Amirhossein Zabolian
- Department of Orthopedics, School of Medicine, 5th Azar Hospital, Golestan University of Medical Sciences, Golestan, Iran
| | | | - Kiavash Hushmandi
- Department of Food Hygiene and Quality Control, Division of Epidemiology & Zoonosis, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | - Amir Reza Aref
- Belfer Center for Applied Cancer Science, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA; Translational Sciences, Xsphera Biosciences Inc., 6 Tide Street, Boston, MA 02210, USA
| | - Milad Ashrafizadeh
- Faculty of Engineering and Natural Sciences, Sabanci University, Orta Mahalle, Üniversite Caddesi No. 27, Orhanlı, Tuzla, 34956 Istanbul, Turkey
| | - Ali Zarrabi
- Department of Biomedical Engineering, Faculty of Engineering and Natural Sciences, Istinye University, Sariyer, Istanbul 34396, Turkey
| | - Noushin Nabavi
- Department of Urological Sciences and Vancouver Prostate Centre, University of British Columbia, Vancouver, BC, Canada V6H3Z6
| | - Navid Rabiee
- School of Engineering, Macquarie University, Sydney, New South Wales 2109, Australia
| | - Mehrdad Hashemi
- Department of Genetics, Faculty of Advanced Science and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran; Farhikhtegan Medical Convergence Sciences Research Center, Farhikhtegan Hospital Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
| | - Saeed Samarghandian
- Healthy Ageing Research Centre, Neyshabur University of Medical Sciences, Neyshabur, Iran.
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7
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Wang S, Chao F, Zhang C, Han D, Xu G, Chen G. Circular RNA circPFKP promotes cell proliferation by activating IMPDH2 in prostate cancer. Cancer Lett 2022; 524:109-120. [PMID: 34673127 DOI: 10.1016/j.canlet.2021.10.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 10/14/2021] [Accepted: 10/16/2021] [Indexed: 12/22/2022]
Abstract
Prostate cancer (PCa), especially castration-resistant PCa, is a common and fatal disease. circRNAs had been confirmed to affect the proliferation of a variety of malignant tumors. Exploring the role of circRNAs in PCa progression and discovering new therapeutic targets are of great importance for the treatment of PCa. In the present study, we found that the expression of circPFKP was significantly increased in PCa tissues compared with adjacent noncancerous prostate tissues, and was correlated with the D'Amico risk classification, N stage, and prognostic stage group of PCa. CircPFKP promotes the proliferation of PCa cells in vitro and in vivo. Suppressing circPFKP induced the G1/S arrest of PCa cells. Mechanistically, circPFKP interacted with IMPDH2, promoted the biogenesis of guanine nucleotides. Moreover, the replenishment of intracellular guanine nucleotides pool reverses the inhibitory effect of knocking-down circPFKP on PCa cell proliferation. hnRNPF might promote circPFKP generation by binding to flanking Alu elements. Our results identify a novel functional interaction of circPFKP with IMPDH2, which promotes the proliferation of PCa cells.
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Affiliation(s)
- Shiyu Wang
- Department of Urology, Jinshan Hospital, Fudan University, Shanghai, 201508, China; Department of Surgery, Shanghai Medical College, Fudan University, Shanghai, 200032, China
| | - Fan Chao
- Department of Urology, Jinshan Hospital, Fudan University, Shanghai, 201508, China; Department of Surgery, Shanghai Medical College, Fudan University, Shanghai, 200032, China
| | - Cong Zhang
- Department of Urology, Jinshan Hospital, Fudan University, Shanghai, 201508, China; Department of Surgery, Shanghai Medical College, Fudan University, Shanghai, 200032, China
| | - Dunsheng Han
- Department of Urology, Jinshan Hospital, Fudan University, Shanghai, 201508, China; Department of Surgery, Shanghai Medical College, Fudan University, Shanghai, 200032, China
| | - Guoxiong Xu
- Research Center for Clinical Medicine, Jinshan Hospital, Fudan University, Shanghai, 201508, China.
| | - Gang Chen
- Department of Urology, Jinshan Hospital, Fudan University, Shanghai, 201508, China; Department of Surgery, Shanghai Medical College, Fudan University, Shanghai, 200032, China.
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