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Shi J, Yu X, Li G, Zhao X, Chen J, Fang Y, Yang Y, Wang T, Xu T, Bian L, Lyu L, He Y. DTL promotes head and neck squamous cell carcinoma progression by mediating the degradation of ARGLU1 to regulate the Notch signaling pathway. Int J Biol Macromol 2024; 259:129184. [PMID: 38218284 DOI: 10.1016/j.ijbiomac.2023.129184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 12/30/2023] [Accepted: 12/30/2023] [Indexed: 01/15/2024]
Abstract
Head and neck squamous cell carcinoma (HNSCC) is the sixth most common cancer worldwide, with a high incidence in squamous epithelium. The E3 ubiquitin ligase DTL is a component of the CRL4A complex and is widely involved in tumor progression. We aimed to analyze the role of DTL in HNSCC and to explore its mechanism of action. Through clinical analysis, we found that DTL is upregulated in HNSCC tissues and is associated with the tumor microenvironment and poor survival in patients. Through gain-of-function and loss-of-function assays, we showed that DTL promotes cell proliferation and migration in vitro and tumor growth in vivo. Mass spectrometry analysis and immunoprecipitation assays showed that DTL interacts with ARGLU1 to promote K11-linked ubiquitination-mediated degradation of ARGLU1, thereby promoting the activation of the CSL-dependent Notch signaling pathway. Furthermore, siARGLU1 blocks the inhibitory effects of DTL knockdown on HNSCC cells. In this study, we showed that DTL promotes HNSCC progression through K11-linked ubiquitination of ARGLU1 to activate the CSL-dependent Notch pathway. These findings identify a promising therapeutic target for HNSCC.
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Affiliation(s)
- Jingpei Shi
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, NHC Key Laboratory of Drug Addiction Medicine, Kunming Medical University, Kunming 650106, Yunnan, China; Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming 650500, Yunnan, China
| | - Xiaonan Yu
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, NHC Key Laboratory of Drug Addiction Medicine, Kunming Medical University, Kunming 650106, Yunnan, China
| | - Guoyu Li
- Department of Colorectal Surgery, Yunnan Cancer Hospital, The Third Affiliated Hospital of Kunming Medical University, Kunming 650118, Yunnan, China
| | - Xiaoyu Zhao
- Department of Dermatology, The First Affiliated Hospital of Kunming Medical University, Kunming 650032,Yunnan, China
| | - Jiwen Chen
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming 650500, Yunnan, China
| | - Ying Fang
- Department of Infection and Hepatology, The First Affiliated Hospital of Kunming Medical University, 650032, Yunnan, China
| | - Yan Yang
- Department of Hepatobiliary and Pancreatic Surgery and Liver Transplantion, the First People's Hospital of Kunming, Kunming 650011, Yunnan, China
| | - Ting Wang
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming 650500, Yunnan, China
| | - Tianyong Xu
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming 650500, Yunnan, China
| | - Li Bian
- Department of Pathology, The First Affiliated Hospital of Kunming Medical University, Kunming 650032, Yunnan, China.
| | - Lechun Lyu
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming 650500, Yunnan, China.
| | - Yongwen He
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, NHC Key Laboratory of Drug Addiction Medicine, Kunming Medical University, Kunming 650106, Yunnan, China; Qujing Medical College, Qujing 655099, Yunnan, China.
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Lin Y, Tang W, Huang P, Wang Z, Duan L, Jia C, Sun R, Liu L, Shen J. Denticleless E3 ubiquitin protein ligase ( DTL) maintains the proliferation and differentiation of epidermis and hair follicles during skin development. Dev Dyn 2023. [PMID: 38131461 DOI: 10.1002/dvdy.682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 11/16/2023] [Accepted: 11/20/2023] [Indexed: 12/23/2023] Open
Abstract
BACKGROUND A precise balance between the proliferation and differentiation of epidermal progenitors is required to achieve the barrier function during the development of epidermis. During the entire process of skin development, the newly formed basal layer cells divide, differentiate, and migrate outward to the surface of the skin, which is tightly regulated by a series of events related to cell cycle progression. The CRL4DTL complex (Cullin 4 RING ligase, in association with the substrate receptor DTL) has long emerged as a master regulator in various cellular processes, which mediates the degradation of key cell cycle proteins. However, the roles of DTL in regulating epidermal morphogenesis during skin development remain unclear. RESULTS We showed that DTL deficiency in epidermal progenitor cells leads to defects in epidermal stratification and loss of hair follicles accompanied by reduced epidermal progenitor cells and disturbed cell cycle progression during skin development. Transcriptome analysis revealed that p53 pathway is activated in DTL-depleted epidermal progenitor cells. The apoptosis of epidermal cells showed in DTL deficiency mice is rescued by the absence of p53, but the proliferation and differentiation defects were p53-independent. CONCLUSION Our findings indicate that DTL plays a vital role in epidermal malformation during skin development.
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Affiliation(s)
- Yanhui Lin
- Institute of Life Sciences, College of Life and Environmental Science, Wenzhou University, Wenzhou, China
| | - Weibo Tang
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
- Laboratory of Tumor Targeted Therapy and Translational Medicine, Jilin Medical University, Jilin, China
| | - Peijun Huang
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Zhendong Wang
- Key Laboratory of Interventional Pulmonology of Zhejiang Province, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Lian Duan
- Central Laboratory, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Chonghui Jia
- Department of Endodontics, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Ruizhen Sun
- Department of Histology and Embryology, Harbin Medical University, Harbin, China
| | - Li Liu
- Institute of Life Sciences, College of Life and Environmental Science, Wenzhou University, Wenzhou, China
| | - Jingling Shen
- Institute of Life Sciences, College of Life and Environmental Science, Wenzhou University, Wenzhou, China
- Department of Histology and Embryology, Harbin Medical University, Harbin, China
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Li Y, Zhao Q, Yao J, Lv C, Gao Y, Sun D, Yang Y. MiR-96-5p Suppresses Progression of Arsenite-Induced Human Keratinocyte Proliferation and Malignant Transformation by Targeting Denticleless E3 Ubiquitin Protein Ligase Homolog. Toxics 2023; 11:978. [PMID: 38133379 PMCID: PMC10747408 DOI: 10.3390/toxics11120978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 11/29/2023] [Accepted: 11/29/2023] [Indexed: 12/23/2023]
Abstract
Long-term exposure to arsenic has been linked to a variety of cancers, among which skin cancer is the most prevalent form. However, the mechanism underlying arsenic carcinogenesis is unclear, and there is still limited information on the role of miRNAs in arsenic-induced skin cancer. This study aims to explore the role of miR-96-5p in the arsenite-induced proliferation and malignant transformation of human HaCaT keratinocytes. The GEO database (accession numbers GSE97303, GSE97305, and GSE97306) was used to extract mRNA and miRNA expression profiles of HaCaT cells treated with or without 0.1 μmol/L sodium arsenite for 3 and 7 weeks. In this paper, according to the CCK8 assay result, HaCaT cells exposed to 0.1 μmol/L sodium arsenite for 48 h were finalized. CCK8, MTT, EdU incorporation, and colony formation assays were used to determine the viability and proliferation of HaCaT cells and transformed HaCaT (T-HaCaT) cells. The subcellular localization and relative expression levels of DTL, as well as miR-96-5p in HaCaT cells induced by arsenite, were determined via immunofluorescence, RT-qPCR, and Western blot. Dual-luciferase reporter assay was performed to identify miR-96-5p bound directly to DTL. Transfection of miR-96-5p mimics or DTL siRNA was conducted to verify the arsenite-induced viability of HaCaT cells and T-HaCaT cells. T-HaCaT cells and nude mice were used to construct arsenite-induced malignant transformation and an in vivo xenograft model to demonstrate the over-expressed effect of miR-96-5p. The results showed that DTL was the target gene of miR-96-5p. Meanwhile, we also found that 0.1 μmol/L sodium arsenite upregulated DTL by decreasing the miR-96-5p level, leading to the proliferation and malignant transformation of HaCaT cells. MiR-96-5p agomir treatment slowed the growth of transplanted HaCaT cells transformed by arsenite in a manner associated with DTL downregulation in the nude mice xenograft model. Taken together, we confirmed that miR-96-5p, as a potent regulator of DTL, suppressed arsenite-induced HaCaT cell proliferation and malignant transformation, which might provide a novel therapeutic target for the treatment of arsenic-induced skin cancer.
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Affiliation(s)
- Yan Li
- Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin 150081, China
- Key Lab of Etiology and Epidemiology, Education Bureau of Heilongjiang Province & Ministry of Health (23618504), Harbin Medical University, Harbin 150081, China
- Heilongjiang Provincial Key Laboratory of Trace Elements and Human Health, Harbin Medical University, Harbin 150081, China
| | - Qiaoshi Zhao
- Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin 150081, China
- Key Lab of Etiology and Epidemiology, Education Bureau of Heilongjiang Province & Ministry of Health (23618504), Harbin Medical University, Harbin 150081, China
- Heilongjiang Provincial Key Laboratory of Trace Elements and Human Health, Harbin Medical University, Harbin 150081, China
| | - Jinyin Yao
- Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin 150081, China
- Key Lab of Etiology and Epidemiology, Education Bureau of Heilongjiang Province & Ministry of Health (23618504), Harbin Medical University, Harbin 150081, China
- Heilongjiang Provincial Key Laboratory of Trace Elements and Human Health, Harbin Medical University, Harbin 150081, China
| | - Chunpeng Lv
- Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin 150081, China
- Key Lab of Etiology and Epidemiology, Education Bureau of Heilongjiang Province & Ministry of Health (23618504), Harbin Medical University, Harbin 150081, China
- Heilongjiang Provincial Key Laboratory of Trace Elements and Human Health, Harbin Medical University, Harbin 150081, China
| | - Yanhui Gao
- Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin 150081, China
- Key Lab of Etiology and Epidemiology, Education Bureau of Heilongjiang Province & Ministry of Health (23618504), Harbin Medical University, Harbin 150081, China
- Heilongjiang Provincial Key Laboratory of Trace Elements and Human Health, Harbin Medical University, Harbin 150081, China
- Institution of Environmentally Related Diseases, Harbin Medical University, Harbin 150081, China
| | - Dianjun Sun
- Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin 150081, China
- Key Lab of Etiology and Epidemiology, Education Bureau of Heilongjiang Province & Ministry of Health (23618504), Harbin Medical University, Harbin 150081, China
- Heilongjiang Provincial Key Laboratory of Trace Elements and Human Health, Harbin Medical University, Harbin 150081, China
| | - Yanmei Yang
- Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin 150081, China
- Key Lab of Etiology and Epidemiology, Education Bureau of Heilongjiang Province & Ministry of Health (23618504), Harbin Medical University, Harbin 150081, China
- Heilongjiang Provincial Key Laboratory of Trace Elements and Human Health, Harbin Medical University, Harbin 150081, China
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Liu Z, Yang G, Yi X, Zhang S, Feng Z, Cui X, Chen F, Yu L. Osteopontin regulates the growth and invasion of liver cancer cells via DTL. Oncol Lett 2023; 26:476. [PMID: 37809049 PMCID: PMC10551862 DOI: 10.3892/ol.2023.14064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 02/07/2023] [Accepted: 07/19/2023] [Indexed: 10/10/2023] Open
Abstract
Osteopontin (OPN), a secreted phosphoglycoprotein, has important roles in tumor growth, invasion and metastasis in numerous types of cancers. Denticleless E3 ubiquitin protein ligase homolog (DTL), one of the CUL4-DDB1-associated factors (DCAFs), has also been associated with the invasion and metastasis of cancer cells. In the present study, OPN was found to induce DTL expression in liver cancer cells, and the results obtained using luciferase activity assays demonstrated that OPN could transcriptionally activate DTL expression in liver cancer cells. Furthermore, the results of the present study demonstrated that OPN could increase the expression of DTL via PI3K/AKT signaling. In conclusion, the present study demonstrated that OPN, as an extracellular matrix protein, is able to promote the growth and invasion of liver cancer cells through stimulation of the expression of DTL via the PI3K/AKT signaling pathway.
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Affiliation(s)
- Zhiyong Liu
- Department of General Interventional Radiology, Guangxi Academy of Medical Sciences and The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
| | - Guang Yang
- State Key Laboratory of Oncology in South China, Department of Imaging and Interventional Radiology, Cancer Center, Sun Yat-sen University, Guangzhou, Guangdong 510060, P.R. China
| | - Xiaoyu Yi
- Department of General Interventional Radiology, Guangxi Academy of Medical Sciences and The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
| | - Shijie Zhang
- Department of General Interventional Radiology, Guangxi Academy of Medical Sciences and The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
| | - Zhibo Feng
- Department of General Interventional Radiology, Guangxi Academy of Medical Sciences and The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
| | - Xudong Cui
- Department of General Interventional Radiology, Guangxi Academy of Medical Sciences and The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
| | - Feilong Chen
- Department of General Interventional Radiology, Guangxi Academy of Medical Sciences and The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
| | - Lei Yu
- Department of General Interventional Radiology, Guangxi Academy of Medical Sciences and The People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
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Dong R, Zhang D, Han B, Xu L, Zhang D, Cheng Z, Qiu X. DTL is a Novel Downstream Gene of E2F1 that Promotes the Progression of Hepatocellular Carcinoma. Curr Cancer Drug Targets 2023; 23:817-828. [PMID: 37171007 DOI: 10.2174/1568009623666230511100246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Revised: 04/16/2023] [Accepted: 05/01/2023] [Indexed: 05/13/2023]
Abstract
BACKGROUND Hepatocellular carcinoma (HCC), one of the world's most prevalent malignancies, accounts for 90% of primary liver cancer cases. Recent studies have shown an increased expression of denticles E3 ubiquitin protein ligase homolog (DTL) in several different tumor types, but its function and regulatory mechanisms remain unclear. AIMS This study aimed to investigate the expressions of the Cullin4 (CUL4) complex in HCC and elucidate the roles of DTL in HCC cells. METHODS The relative expression of the CUL4 complex and its clinical significance were analyzed with The Cancer Genome Atlas (TCGA) data, and the level of DTL was confirmed by immunohistochemistry. The functions of DTL1 and upstream E2F1 were evaluated by a Western blot, MTT, transwell, and xenograft in HCC cell lines. RESULTS The elevated mRNA expression of the CUL4 complex, including CUL4B, DDB1 (Damage Specific DNA Binding Protein 1), and DTL, was associated with the overall survival of HCC patients. We also found that the DTL protein was elevated in HCC tissues, and patients with highly expressed DTL and nucleus-located DTL had a poorer survival time. DTL knockdown significantly inhibited cancer proliferation, migration, and invasion. Further experiments showed that E2F1 was an upstream regulatory molecule of DTL, which was bound to the promoter of DTL, promoting the expression of DTL. CONCLUSION The study results demonstrate that E2F1-DTL signaling promotes the growth, migration, and invasion of HCC cells, which provides new insights and a potential biological target for future HCC therapies.
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Affiliation(s)
- Ruiqiang Dong
- Department of General Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Department of General Surgery, The Affiliated Luoyang Central Hospital of Zhengzhou University, Luoyang, China
| | - Danhua Zhang
- Department of General Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Baowei Han
- Department of General Surgery, The Affiliated Luoyang Central Hospital of Zhengzhou University, Luoyang, China
| | - Lingxue Xu
- National Center for International Research in Cell and Gene Therapy, Sino-British Research Centre for Molecular Oncology, School of Basic Medical Sciences, Academy of Medical Sciences, Zhengzhou University, Zhengzhou, China
| | - Danfeng Zhang
- Department of General Surgery, The Affiliated Luoyang Central Hospital of Zhengzhou University, Luoyang, China
| | - Zhenguo Cheng
- National Center for International Research in Cell and Gene Therapy, Sino-British Research Centre for Molecular Oncology, School of Basic Medical Sciences, Academy of Medical Sciences, Zhengzhou University, Zhengzhou, China
| | - Xinguang Qiu
- Department of General Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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Li Z, Wang R, Qiu C, Cao C, Zhang J, Ge J, Shi Y. Role of DTL in Hepatocellular Carcinoma and Its Impact on the Tumor Microenvironment. Front Immunol 2022; 13:834606. [PMID: 35392073 PMCID: PMC8980229 DOI: 10.3389/fimmu.2022.834606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 12/13/2021] [Accepted: 02/21/2022] [Indexed: 01/15/2023] Open
Abstract
Background The crucial role of DTL has been previously implicated in genomic stability; however, its prognostic value and its relation with tumor immunity in hepatocellular carcinoma (HCC) remain to be further explored. Methods Transcriptional and mutational datasets as well as clinical information were retrieved from the GEO, ICGC, and TCGA databases. Differentially expressed genes (DEGs) were obtained from the comparison of DTLhigh and DTLlow expression groups of the TCGA-HCC cohort. Those genes were under KEGG and gene ontology (GO) analyses to decipher the influence of the DTL gene on the biological behavior of HCC tumor cells. The survival status and mutational characteristics of patients according to DTL levels were depicted and analyzed. The DTL overexpression in HCC and its impact on prognosis were further confirmed by a cohort of 114 HCC patients (validation cohort). The TIMER, GEPIA, and TISIDB databases were adopted to investigate the potential relations between DTL levels and the status of immune cells, as well as immune cell infiltrations. Results The DTL gene is overexpressed in tumor tissues compared with distant non-malignant liver tissues, and DTL overexpression in HCC would enhance the HCC cells in the activities of cell cycle and division. HCC patients with high DTL expression have unfavorable clinical outcomes and harbor more somatic mutations than those with low DTL expression, and multivariate analysis also revealed that DTL overexpression could act as an independent biomarker for prognosis. Moreover, the DTL gene was positively linked to marker sets of infiltrating activated CD8+ and CD4+ T cells; however, these cells demonstrated to be functionally exhausted. Conclusions Patients with a DTL overexpression phenotype in HCC have poorer prognosis than those in the DTLlow group due to the role of the DTL gene in the process of pro-cell proliferation, accompanied by the immunosuppressive microenvironment and T cell exhaustion.
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Affiliation(s)
- Zuyin Li
- Department of Hepatobiliary Surgery, Peking University Organ Transplantation Institute, Peking University People's Hospital, Beijing, China.,Department of General Surgery, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Rangrang Wang
- Department of General Surgery, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Department of General Surgery, Huadong Hospital Affiliated to Fudan University, Shanghai, China
| | - Chen Qiu
- Center of Gallbladder Disease, Shanghai East Hospital, Institute of Gallstone Disease, School of Medicine, Tongji University, Shanghai, China
| | - Can Cao
- Department of General Surgery, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jianming Zhang
- Department of General Surgery, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Department of General Surgery, Huadong Hospital Affiliated to Fudan University, Shanghai, China
| | - Jun Ge
- Department of General Surgery, The 306th Hospital of People's Liberation Army (PLA)-Peking University Teaching Hospital, Beijing, China
| | - Yuanping Shi
- Department of Endocrinology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Vedelek B, Kovács Á, Boros IM. Evolutionary mode for the functional preservation of fast-evolving Drosophila telomere capping proteins. Open Biol 2021; 11:210261. [PMID: 34784790 PMCID: PMC8596017 DOI: 10.1098/rsob.210261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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] [Indexed: 01/04/2023] Open
Abstract
DNA end protection is fundamental for the long-term preservation of the genome. In vertebrates the Shelterin protein complex protects telomeric DNA ends, thereby contributing to the maintenance of genome integrity. In the Drosophila genus, this function is thought to be performed by the Terminin complex, an assembly of fast-evolving subunits. Considering that DNA end protection is fundamental for successful genome replication, the accelerated evolution of Terminin subunits is counterintuitive, as conservation is supposed to maintain the assembly and concerted function of the interacting partners. This problem extends over Drosophila telomere biology and provides insight into the evolution of protein assemblies. In order to learn more about the mechanistic details of this phenomenon we have investigated the intra- and interspecies assemblies of Verrocchio and Modigliani, two Terminin subunits using in vitro assays. Based on our results and on homology-based three-dimensional models for Ver and Moi, we conclude that both proteins contain Ob-fold and contribute to the ssDNA binding of the Terminin complex. We propose that the preservation of Ver function is achieved by conservation of specific amino acids responsible for folding or localized in interacting surfaces. We also provide here the first evidence on Moi DNA binding.
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Affiliation(s)
- Balázs Vedelek
- Department of Biochemistry and Molecular Biology, University of Szeged, Szeged, Hungary,Institute of Biochemistry, Biological Research Centre, Szeged, Hungary
| | - Ákos Kovács
- Department of Biochemistry and Molecular Biology, University of Szeged, Szeged, Hungary
| | - Imre M. Boros
- Department of Biochemistry and Molecular Biology, University of Szeged, Szeged, Hungary,Institute of Biochemistry, Biological Research Centre, Szeged, Hungary
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Qu Y, Chen C, Chen X, Hao Y, She H, Wang M, Ericson PGP, Lin H, Cai T, Song G, Jia C, Chen C, Zhang H, Li J, Liang L, Wu T, Zhao J, Gao Q, Zhang G, Zhai W, Zhang C, Zhang YE, Lei F. The evolution of ancestral and species-specific adaptations in snowfinches at the Qinghai-Tibet Plateau. Proc Natl Acad Sci U S A 2021; 118:e2012398118. [PMID: 33753478 PMCID: PMC8020664 DOI: 10.1073/pnas.2012398118] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Species in a shared environment tend to evolve similar adaptations under the influence of their phylogenetic context. Using snowfinches, a monophyletic group of passerine birds (Passeridae), we study the relative roles of ancestral and species-specific adaptations to an extreme high-elevation environment, the Qinghai-Tibet Plateau. Our ancestral trait reconstruction shows that the ancestral snowfinch occupied high elevations and had a larger body mass than most nonsnowfinches in Passeridae. Subsequently, this phenotypic adaptation diversified in the descendant species. By comparing high-quality genomes from representatives of the three phylogenetic lineages, we find that about 95% of genes under positive selection in the descendant species are different from those in the ancestor. Consistently, the biological functions enriched for these species differ from those of their ancestor to various degrees (semantic similarity values ranging from 0.27 to 0.5), suggesting that the three descendant species have evolved divergently from the initial adaptation in their common ancestor. Using a functional assay to a highly selective gene, DTL, we demonstrate that the nonsynonymous substitutions in the ancestor and descendant species have improved the repair capacity of ultraviolet-induced DNA damage. The repair kinetics of the DTL gene shows a twofold to fourfold variation across the ancestor and the descendants. Collectively, this study reveals an exceptional case of adaptive evolution to high-elevation environments, an evolutionary process with an initial adaptation in the common ancestor followed by adaptive diversification of the descendant species.
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Affiliation(s)
- Yanhua Qu
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China;
| | - Chunhai Chen
- BGI Genomics, BGI-Shenzhen, 518084 Shenzhen, China
| | - Xiumin Chen
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China
| | - Yan Hao
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China
- College of Life Science, University of Chinese Academy of Sciences, 100049 Beijing, China
| | - Huishang She
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China
- College of Life Science, University of Chinese Academy of Sciences, 100049 Beijing, China
| | - Mengxia Wang
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China
- College of Life Science, University of Chinese Academy of Sciences, 100049 Beijing, China
| | - Per G P Ericson
- Department of Bioinformatics and Genetics, Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden
| | - Haiyan Lin
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China
| | - Tianlong Cai
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China
| | - Gang Song
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China
| | - Chenxi Jia
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China
| | - Chunyan Chen
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China
| | - Hailin Zhang
- BGI Genomics, BGI-Shenzhen, 518084 Shenzhen, China
| | - Jiang Li
- BGI Genomics, BGI-Shenzhen, 518084 Shenzhen, China
| | - Liping Liang
- BGI Genomics, BGI-Shenzhen, 518084 Shenzhen, China
| | - Tianyu Wu
- BGI Genomics, BGI-Shenzhen, 518084 Shenzhen, China
| | - Jinyang Zhao
- BGI Genomics, BGI-Shenzhen, 518084 Shenzhen, China
| | - Qiang Gao
- BGI Genomics, BGI-Shenzhen, 518084 Shenzhen, China
| | - Guojie Zhang
- BGI-Shenzhen, 518083 Shenzhen, China
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, 650223 Kunming, China
- Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, 650223 Kunming, China
- Section for Ecology and Evolution, Department of Biology, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Weiwei Zhai
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China
- Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, 650223 Kunming, China
| | - Chi Zhang
- BGI Genomics, BGI-Shenzhen, 518084 Shenzhen, China;
| | - Yong E Zhang
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China;
- College of Life Science, University of Chinese Academy of Sciences, 100049 Beijing, China
- Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, 650223 Kunming, China
- Chinese Institute for Brain Research, 102206 Beijing, China
| | - Fumin Lei
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China;
- College of Life Science, University of Chinese Academy of Sciences, 100049 Beijing, China
- Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, 650223 Kunming, China
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Cui H, Wang Q, Lei Z, Feng M, Zhao Z, Wang Y, Wei G. DTL promotes cancer progression by PDCD4 ubiquitin-dependent degradation. J Exp Clin Cancer Res 2019; 38:350. [PMID: 31409387 PMCID: PMC6693180 DOI: 10.1186/s13046-019-1358-x] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Accepted: 08/06/2019] [Indexed: 12/20/2022]
Abstract
Background Ubiquitin E3 ligase CUL4A plays important oncogenic roles in the development of cancers. DTL, one of the CUL4-DDB1 associated factors (DCAFs), may involve in the process of cancer development. Programmed cell death 4 (PDCD4) is a tumor suppressor gene involved in cell apoptosis, transformation, invasion and tumor progression. Methods Affinity-purification mass spectrometry was used to identify potential DTL interaction proteins. Co-immunoprecipitation (Co-IP) was performed to verify protein interaction between DTL and PDCD4. mRNA levels in cancer cells and tissues were detected by Quantitative real-time PCR. Lentivirus was used to establish stable overexpression and knocking down cell lines for DTL and PDCD4. Transwell and wound healing assays were used to determine migration ability of cancer cells. Matrigel assay was used to determine invasion ability of cancer cells. MTT and colony formation assays were used to evaluate proliferation of cancer cells. Results In this study, programmed cell death 4 (PDCD4) was identified as a potential substrate of DTL. Co-IP and immunofluorescence assays further confirmed the interaction between DTL and PDCD4. Moreover, DTL overexpression decreased the protein level and accelerated the degradation rate of PDCD4. Through in vitro ubiquitination experiment, we proved that PDCD4 was degraded by DTL through ubiquitination. Clinically DTL was significantly up-regulated in cancer tissues than that in normal tissues. The survival curves showed that cancer patients with higher DTL expression owned lower survival rate. Functional experiments showed that DTL not only enhanced the proliferation and migration abilities of cancer cells, but also promoted the tumorigenesis in nude mice. Rescued experiment results demonstrated that silencing PDCD4 simultaneous with DTL recovered the phenotypes defect caused by DTL knocking down. Conclusions Our results elucidated that DTL enhanced the motility and proliferation of cancer cells through degrading PDCD4 to promote the development of cancers. Electronic supplementary material The online version of this article (10.1186/s13046-019-1358-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Haoran Cui
- Department of Cell Biology and Key Laboratory of Experimental Teratology, Ministry of Education, Shandong University School of Medicine, Jinan, Shandong, China
| | - Qin Wang
- Department of Anesthesiology, Qilu Hospital, Shandong University, Jinan, Shandong, China
| | - Zhenchuan Lei
- College of Marine Life Sciences, Ocean University of China, Qingdao, Shandong, China
| | - Maoxiao Feng
- Department of Cell Biology and Key Laboratory of Experimental Teratology, Ministry of Education, Shandong University School of Medicine, Jinan, Shandong, China
| | - Zhongxi Zhao
- School of Pharmaceutical Sciences, Shandong University, No. 44 West Wenhua Road, Jinan, Shandong, China
| | - Yunshan Wang
- Department of Clinical Laboratory, The Second Hospital of Shandong University, Jinan, Shandong, China.
| | - Guangwei Wei
- Department of Cell Biology and Key Laboratory of Experimental Teratology, Ministry of Education, Shandong University School of Medicine, Jinan, Shandong, China.
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Yang L, Dai J, Ma M, Mao L, Si L, Cui C, Sheng X, Chi Z, Yu S, Xu T, Yu J, Kong Y, Guo J. Identification of a functional polymorphism within the 3'-untranslated region of denticleless E3 ubiquitin protein ligase homolog associated with survival in acral melanoma. Eur J Cancer 2019; 118:70-81. [PMID: 31325875 DOI: 10.1016/j.ejca.2019.06.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 11/28/2018] [Revised: 05/07/2019] [Accepted: 06/20/2019] [Indexed: 12/25/2022]
Abstract
BACKGROUND High expression of denticleless E3 ubiquitin protein ligase homologue (DTL) correlates with poor disease-free survival and overall survival in cutaneous melanoma, but the molecular features and clinical significance of this gene in acral melanoma (AM) remain unclear. METHODS The expression levels of DTL were compared between AM and benign melanocytic nevi using existing Gene Expression Omnibus data and validated in fresh frozen tissues. Two candidate tag single-nucleotide polymorphisms (SNPs) in the 3'-untranslated region (3'UTR) of DTL in patients with AM were sequenced and analysed for their association with survival in a discovery cohort (n = 570), and the significant SNP was subjected to a replication cohort (n = 201). The expression of DTL was evaluated by immunohistochemistry. The microRNA interacting with rs11275300:C > G was predicted using in silico target prediction tools and validated by in vitro analysis. RESULTS DTL was overexpressed in AM compared with benign melanocytic nevi. rs11275300:C > G was found to be significantly associated with progression-free survival and overall survival of patients with AM in both cohorts and the combined cohort. Furthermore, the DTL expression level in the patients with the rs11275300:G allele was higher than that in patients with the CC genotype. In vitro analysis demonstrated that DTL was a direct target of hsa-miR-4672, and the rs11275300:G allele interfered with the binding affinity of hsa-miR-4672 with the 3'UTR of DTL and thereby increased DTL expression. CONCLUSION The rs11275300:G allele in the 3'UTR of DTL may lead to a poor prognosis and allele-specific increase in the expression of DTL by post-transcriptional regulation in AM.
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Affiliation(s)
- Lu Yang
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Jie Dai
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Meng Ma
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China; Department of Radiotherapy, Beijing Chest Hospital, Capital Medical University, Beijing Tuberculosis and Thoracic Tumor Research Institute, Beijing, 101149, China
| | - Lili Mao
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Lu Si
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Chuanliang Cui
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Xinan Sheng
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Zhihong Chi
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Sifan Yu
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Tianxiao Xu
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Jinyu Yu
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China
| | - Yan Kong
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China.
| | - Jun Guo
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Renal Cancer and Melanoma, Peking University Cancer Hospital and Institute, Beijing, 100142, China.
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Huang F, Wang M, Liu R, Wang JZ, Schadt E, Haroutunian V, Katsel P, Zhang B, Wang X. CDT2-controlled cell cycle reentry regulates the pathogenesis of Alzheimer's disease. Alzheimers Dement 2019; 15:217-231. [PMID: 30321504 PMCID: PMC6758558 DOI: 10.1016/j.jalz.2018.08.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 07/07/2018] [Accepted: 08/31/2018] [Indexed: 12/29/2022]
Abstract
INTRODUCTION Altered cell cycle reentry has been observed in Alzheimer's disease (AD). Denticleless (DTL) was predicted as the top driver of a cell cycle subnetwork associated with AD. METHODS We systematically investigated DTL expression in AD and studied the molecular, cellular, and behavioral endophenotypes triggered by DTL overexpression. RESULTS We experimentally validated that CDT2, the protein encoded by DTL, activated cyclin-dependent kinases through downregulating P21, which induced tau hyperphosphorylation and Aβ toxicity, two hallmarks of AD. We demonstrated that cyclin-dependent kinases inhibition by roscovitine not only rescued CDT2-induced cognitive defects but also reversed expression changes induced by DTL overexpression. RNA-seq data from the DTL overexpression experiments revealed the molecular mechanisms underlying CDT2 controlled cell cycle reentry in AD. DISCUSSION These findings provide new insights into the molecular mechanisms of AD pathogenesis and thus pave a way for developing novel therapeutics for AD by targeting AD specific cell cycle networks and drivers.
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Affiliation(s)
- Fang Huang
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Minghui Wang
- Department of Genetics and Genomic Sciences, Mount Sinai Center for Transformative Disease Modeling, Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, NY, USA
| | - Rong Liu
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jian-Zhi Wang
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Eric Schadt
- Department of Genetics and Genomic Sciences, Mount Sinai Center for Transformative Disease Modeling, Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, NY, USA
| | - Vahram Haroutunian
- Departments of Psychiatry and Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA; Department of Psychiatry, JJ Peters VA Medical Center, Bronx, NY, USA; Fishberg Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA; The Alzheimer's Disease Research Center, Icahn School of Medicine at Mount Sinai, New York NY, USA
| | - Pavel Katsel
- Departments of Psychiatry and Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Bin Zhang
- Department of Genetics and Genomic Sciences, Mount Sinai Center for Transformative Disease Modeling, Icahn Institute of Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, NY, USA.
| | - Xiaochuan Wang
- Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Education Ministry of China for Neurological Disorders, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Co-innovation Center of Neuroregeneration, Nantong University, Nantong, JS, China.
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Chen YC, Chen IS, Huang GJ, Kang CH, Wang KC, Tsao MJ, Pan HW. Targeting DTL induces cell cycle arrest and senescence and suppresses cell growth and colony formation through TPX2 inhibition in human hepatocellular carcinoma cells. Onco Targets Ther 2018; 11:1601-1616. [PMID: 29606879 PMCID: PMC5868578 DOI: 10.2147/ott.s147453] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [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] [Indexed: 12/11/2022] Open
Abstract
Background Hepatocellular carcinoma (HCC) has an increasing incidence and high mortality. Surgical operation is not a comprehensive strategy for liver cancer. Moreover, tolerating systemic chemotherapy is difficult for patients with HCC because hepatic function is often impaired due to underlying cirrhosis. Therefore, a comprehensive strategy for cancer treatment should be developed. DTL (Cdc10-dependent transcript 2) is a critical regulator of cell cycle progression and genomic stability. In our previous study, the upregulation of DTL expression in aggressive HCC correlated positively with tumor grade and poor patient survival. We hypothesize that targeting DTL may provide a novel therapeutic strategy for liver cancer. DTL small interference RNAs were used to knock down DTL protein expression. Methods A clonogenic assay, immunostaining, double thymidine block, imaging flow cytometry analysis, and a tumor spheroid formation assay were used to analyze the role of DTL in tumor cell growth, cell cycle progression, micronucleation, ploidy, and tumorigenicity. Results Our results demonstrated that targeting DTL reduced cell cycle regulators and chromosome segregation genes, resulting in increased cell micronucleation. DTL depletion inhibited liver cancer cell growth, increased senescence, and reduced tumorigenesis. DTL depletion resulted in the disruption of the mitotic proteins cyclin B, CDK1, securin, seprase, Aurora A, and Aurora B as well as the upregulation of the cell cycle arrest gene p21. A rescue assay indicated that DTL should be targeted through TPX2 downregulation for cancer cell growth inhibition. Moreover, DTL silencing inhibited the growth of patient-derived primary cultured HCC cells. Conclusion Our study results indicate that DTL is a potential novel target gene for treating liver cancer through liver cancer cell senescence induction. Furthermore, our results provide insights into molecular mechanisms for targeting DTL in liver cancer cells. The results also indicate several other starting points for future preclinical and clinical studies on liver cancer treatment.
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Affiliation(s)
- Yu-Chia Chen
- Department of Surgery, Division of General Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - I-Shu Chen
- Department of Surgery, Division of General Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Guan-Jin Huang
- Department of Pathology, National Chung Kung University Hospital, Tainan, Taiwan
| | - Chi-Hsiang Kang
- Department of Surgery, Division of General Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Kuo-Chiang Wang
- Department of Surgery, Division of General Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Min-Jen Tsao
- Department of General Surgery, Zuoying Branch of Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan
| | - Hung-Wei Pan
- Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan.,Department of Applied Chemistry, National Pingtung University, Pingtung, Taiwan
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Woo J, Jung S, Gauvin M, Lachapelle P. The DTL ERG electrode comes in different shapes and sizes: Are they all good? Doc Ophthalmol 2017; 135:155-164. [PMID: 28741115 DOI: 10.1007/s10633-017-9600-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [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: 05/02/2017] [Accepted: 07/03/2017] [Indexed: 11/29/2022]
Abstract
PURPOSE Although the DTL fiber electrode has been in use in the ERG field for more than four decades, its composition was never clearly defined. We compared five different types of conductive (DTL type) yarn (differing in terms of mass, number of filaments, and crimping degree) in order to determine whether we could identify one that would be better suited for the recording of ERGs. METHODS Photopic flash ERGs were recorded from five subjects using the following DTL electrodes: 27/7, 22/1, 11/1, 11/1*2, and 22/1*2. Data analysis included amplitude and peak time measurements of the a- and b-waves in the time domain (TD) as well as measurements of specific frequency descriptors of the ERG waveform in the time-frequency domain using the discrete wavelet transform (DWT) approach. The degree of comfortableness was also assessed in 12 subjects with two surveys (Likert 5-point and the ranking scale). RESULTS Comparisons of TD and DWT parameters did not permit to identify the best DTL electrode, all yielding comparable measures. There was a slight trend for the largest electrode (22/1*2) to yield the largest response, but this was at the expense of comfort, the 22/1*2 electrode being rated as the least comfortable. CONCLUSIONS Given the minimal impact the different electrodes had on the amplitude of the signal, we believe that comfort should dictate our choice. It would appear from our results that use of a multifilament electrode is the best choice since one can get an electrode whose size is optimized for the recording of large responses while minimizing the foreign-body sensation due to the small size of each of the filaments that compose this multifilament electrode.
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Affiliation(s)
- Jungeun Woo
- Departments of Ophthalmology and Neurology and Neurosurgery, Research Institute of the McGill University Health Centre/Montreal Children's Hospital, Montreal, QC, Canada
| | - Suna Jung
- Departments of Ophthalmology and Neurology and Neurosurgery, Research Institute of the McGill University Health Centre/Montreal Children's Hospital, Montreal, QC, Canada
| | - Mathieu Gauvin
- Departments of Ophthalmology and Neurology and Neurosurgery, Research Institute of the McGill University Health Centre/Montreal Children's Hospital, Montreal, QC, Canada
| | - Pierre Lachapelle
- Departments of Ophthalmology and Neurology and Neurosurgery, Research Institute of the McGill University Health Centre/Montreal Children's Hospital, Montreal, QC, Canada. .,Department of Ophthalmology, Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, Glen Site, Block E, Room EM03238 (Program Mail Drop Point EM03211), Montreal, QC, H4A 3J1, Canada.
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Kobayashi H, Komatsu S, Ichikawa D, Kawaguchi T, Hirajima S, Miyamae M, Okajima W, Ohashi T, Kosuga T, Konishi H. Overexpression of denticleless E3 ubiquitin protein ligase homolog ( DTL) is related to poor outcome in gastric carcinoma. Oncotarget. 2015;6:36615-36624. [PMID: 26472028 PMCID: PMC4742199 DOI: 10.18632/oncotarget.5620] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Accepted: 10/02/2015] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Denticleless E3 ubiquitin protein ligase homolog (DTL) has been identified in amplified region (1q32) of several cancers and has an oncogenic function. In this study, we tested whether DTL acts as a cancer-promoting gene through its activation/overexpression in gastric cancer (GC). METHODS We analyzed 7 GC cell lines and 100 primary tumors that were curatively resected in our hospital between 2001 and 2003. RESULTS Overexpression of the DTL protein was detected in GC cell lines (4/7 cell lines; 57%) and primary GC tumor samples (42/100 cases; 42%). Knockdown of DTL using several specific siRNAs inhibited the proliferation, migration and invasion in a TP53 mutation-independent manner. Overexpression of the DTL was significantly correlated with lymphatic invasion, deeper tumor depth and higher recurrence rate. Patients with DTL-overexpressing tumors had a worse survival rate than those with non-expressing tumors in overall survival (P = 0.0498, log-rank test) and disease-free survival (P = 0.0324, log-rank test). In a multivariate analysis, DTL positivity was independently associated with a worse overall survival (P = 0.0104, hazard ratio 3.7 [1.36-10.1]) and disease-free survival (P = 0.0070 (hazard ratio, 3.9 (1.45-10.46)) following radical gastrectomy. CONCLUSIONS These findings suggest that DTL overexpression plays a crucial role in tumor cell proliferation and highlights its usefulness as a prognosticator and potential therapeutic target in gastric cancer.
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Benamar M, Guessous F, Du K, Corbett P, Obeid J, Gioeli D, Slingluff CL, Abbas T. Inactivation of the CRL4-CDT2-SET8/p21 ubiquitylation and degradation axis underlies the therapeutic efficacy of pevonedistat in melanoma. EBioMedicine 2016; 10:85-100. [PMID: 27333051 PMCID: PMC5006603 DOI: 10.1016/j.ebiom.2016.06.023] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 06/13/2016] [Accepted: 06/15/2016] [Indexed: 12/01/2022] Open
Abstract
The cullin-based CRL4-CDT2 ubiquitin ligase is emerging as a master regulator of cell proliferation. CRL4-CDT2 prevents re-initiation of DNA replication during the same cell cycle "rereplication" through targeted degradation of CDT1, SET8 and p21 during S-phase of the cell cycle. We show that CDT2 is overexpressed in cutaneous melanoma and predicts poor overall and disease-free survival. CDT2 ablation inhibited a panel of melanoma cell lines through the induction of SET8- and p21-dependent DNA rereplication and senescence. Pevonedistat (MLN4924), a specific inhibitor of the NEDD8 activating enzyme (NAE), inhibits the activity of cullin E3 ligases, thereby stabilizing a vast number of cullin substrates and resulting in cancer cell inhibition in vitro and tumor suppression in nude mice. We demonstrate that pevonedistat is effective at inhibiting the proliferation of melanoma cell lines in vitro through the induction of rereplication-dependent permanent growth arrest as well as through a transient, non-rereplication-dependent mechanism. CRISPR/Cas9-mediated heterozygous deletion of CDKN1A (encoding p21) or SET8 in melanoma cells demonstrated that the rereplication-mediated cytotoxicity of pevonedistat is mediated through preventing the degradation of p21 and SET8 and is essential for melanoma suppression in nude mice. By contrast, pevonedistat-induced transient growth suppression was independent of p21 or SET8, and insufficient to inhibit tumor growth in vivo. Pevonedistat additionally synergized with the BRAF kinase inhibitor PLX4720 to inhibit BRAF melanoma, and suppressed PLX4720-resistant melanoma cells. These findings demonstrate that the CRL4-CDT2-SET8/p21 degradation axis is the primary target of inhibition by pevonedistat in melanoma and suggest that a broad patient population may benefit from pevonedistat therapy. RESEARCH IN CONTEXT The identification of new molecular targets and effective inhibitors is of utmost significance for the clinical management of melanoma. This study identifies CDT2, a substrate receptor for the CRL4 ubiquitin ligase, as a prognostic marker and therapeutic target in melanoma. CDT2 is required for melanoma cell proliferation and inhibition of CRL4(CDT2) by pevonedistat suppresses melanoma in vitro and in vivo through the induction of DNA rereplication and senescence through the stabilization of the CRL4(CDT2) substrates p21 and SET8. Pevonedistat also synergizes with vemurafenib in vivo and suppresses vemurafenib-resistant melanoma cells. These findings show a significant promise for targeting CRL4(CDT2) therapeutically.
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Affiliation(s)
- Mouadh Benamar
- Department of Radiation Oncology, University of Virginia, Charlottesville, VA 22908, USA
| | - Fadila Guessous
- Department of Radiation Oncology, University of Virginia, Charlottesville, VA 22908, USA
| | - Kangping Du
- Department of Radiation Oncology, University of Virginia, Charlottesville, VA 22908, USA
| | - Patrick Corbett
- Department of Radiation Oncology, University of Virginia, Charlottesville, VA 22908, USA
| | - Joseph Obeid
- Department of Surgery, University of Virginia, Charlottesville, VA 22908, USA
| | - Daniel Gioeli
- Department of Microbiology, Immunology, and Cancer Biology, University of Virginia, Charlottesville, VA 22908, USA
| | - Craig L Slingluff
- Department of Surgery, University of Virginia, Charlottesville, VA 22908, USA
| | - Tarek Abbas
- Department of Radiation Oncology, University of Virginia, Charlottesville, VA 22908, USA; Department of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, VA 22908, USA; Center for Cell Signaling, University of Virginia, Charlottesville, VA 22908, USA.
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16
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Hsieh CT, Chang CJ, Su IC, Lin LY. Clinical experiences of dynamic stabilizers: Dynesys and Dynesys top loading system for lumbar spine degenerative disease. Kaohsiung J Med Sci 2016; 32:207-15. [PMID: 27185604 DOI: 10.1016/j.kjms.2016.03.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [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: 11/23/2015] [Revised: 03/09/2016] [Accepted: 03/21/2016] [Indexed: 12/16/2022] Open
Abstract
Dynesys (Dynamic Neutralization System) was designed to overcome the shortcomings of fusion. The Dynesys top loading (DTL) system is a new alternative Dynesys system that can be applied via a minimally invasive procedure. This study aimed to ascertain whether DTL is a suitable device for motion preservation and prevention of instability, and to compare the clinical and radiological outcomes between DTL and Dynesys. In this study, 12 patients were treated with Dynesys and 21 patients were treated with DTL. Back and leg pain were evaluated using the visual analog scale. The Oswestry Disability Index was used to evaluate the patients' function. Range of motion (ROM) at the operative level and for the whole lumbar spine was measured pre- and postoperatively. The length of wound, blood loss, length of hospital stay, and operation duration were also compared. All patients were followed up for 12-76 months. Scores on the visual analog scale and Oswestry Disability Index were significantly improved postoperatively. The median ROM of the whole spine and index level ROM in all patients showed 12.5% and 79.6% loss, respectively. The DTL group exhibited significantly better results in terms of blood loss, wound length, and operation duration, in addition to early ambulation. In conclusion, Dynesys and DTL are semirigid fixation systems that can significantly improve clinical symptoms and signs. Our results suggested that DTL was better than Dynesys as a result of it being a minimally invasive procedure. However, further study with large sample sizes and longer follow-up durations is required to validate the effects of these dynamic stabilizers.
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Affiliation(s)
- Cheng-Ta Hsieh
- Department of Neurosurgery, Cathay General Hospital, Taipei City, Taiwan; Department of Medicine, School of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Chih-Ju Chang
- Department of Neurosurgery, Cathay General Hospital, Taipei City, Taiwan; Department of Medicine, School of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan.
| | - I-Chang Su
- Department of Neurosurgery, Cathay General Hospital, Taipei City, Taiwan; Department of Medicine, School of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Li-Ying Lin
- Department of Surgery, Cathay General Hospital, Taipei City, Taiwan
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Guinement L, Marchesi V, Veres A, Lacornerie T, Buchheit I, Peiffert D. [Development of external quality control protocol for CyberKnife beams dosimetry: preliminary tests multicentre]. Cancer Radiother 2013; 17:288-96. [PMID: 23871458 DOI: 10.1016/j.canrad.2013.04.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [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: 12/19/2012] [Revised: 04/09/2013] [Accepted: 04/11/2013] [Indexed: 12/31/2022]
Abstract
PURPOSE To develop an external quality control procedure for CyberKnife(®) beams. This work conducted in Nancy, has included a test protocol initially drawn by the medical physicist of Nancy and Lille in collaboration with Equal-Estro Laboratory. MATERIALS AND METHODS A head and neck anthropomorphic phantom and a water-equivalent homogeneous cubic plastic test-object, so-called "MiniCube", have been used. Powder and solid thermoluminescent dosimeters as well as radiochromic films have been used to perform absolute and relative dose studies, respectively. The comparison between doses calculated by Multiplan treatment planning system and measured doses have been studied in absolute dose. The dose distributions measured with films and treatment planning system calculations have been compared via the gamma function, configured with different tolerance criteria. RESULTS This work allowed, via solid thermoluminescent dosimeter measurements, verifying the beam reliability with a reproducibility of 1.7 %. The absolute dose measured in the phantom irradiated by the seven participating centres has shown an error inferior to the standard tolerance limits (± 5 %), for most of participating centres. The relative dose measurements performed at Nancy and by the Equal-Estro laboratory allowed defining the most adequate parameters for gamma index (5 %/2mm--with at least 95 % of pixels satisfying acceptability criteria: γ<1). These parameters should be independent of the film analysis software. CONCLUSION This work allowed defining a dosimetric external quality control for CyberKnife(®) systems, based on a reproducible irradiation plan through measurements performed with thermoluminescent dosimeters and radiochromic films. This protocol should be validated by a new series of measurement and taking into account the lessons of this work.
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Affiliation(s)
- L Guinement
- Institut de Cancérologie de Lorraine, Avenue de Bourgogne, CS 30519, 54519 Vandœuvre-lès-Nancy, France.
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