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Basu B, Kal S, Karmakar S, Basu M, Ghosh MK. E3 ubiquitin ligases in lung cancer: Emerging insights and therapeutic opportunities. Life Sci 2024; 336:122333. [PMID: 38061537 DOI: 10.1016/j.lfs.2023.122333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/29/2023] [Accepted: 12/04/2023] [Indexed: 12/18/2023]
Abstract
Aim In this review, we have attempted to provide the readers with an updated account of the role of a family of proteins known as E3 ligases in different aspects of lung cancer progression, along with insights into the deregulation of expression of these proteins during lung cancer. A detailed account of the therapeutic strategies involving E3 ligases that have been developed or currently under development has also been provided in this review. MATERIALS AND METHODS: The review article employs extensive literature search, along with differential gene expression analysis of lung cancer associated E3 ligases using the DESeq2 package in R, and the Gene Expression Profiling Interactive Analysis (GEPIA) database (http://gepia.cancer-pku.cn/). Protein expression analysis of CPTAC lung cancer samples was carried out using the UALCAN webtool (https://ualcan.path.uab.edu/index.html). Assessment of patient overall survival (OS) in response to high and low expression of selected E3 ligases was performed using the online Kaplan-Meier plotter (https://kmplot.com/analysis/index.php?p=background). KEY FINDINGS: SIGNIFICANCE: The review provides an in-depth understanding of the role of E3 ligases in lung cancer progression and an up-to-date account of the different therapeutic strategies targeting oncogenic E3 ligases for improved lung cancer management.
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Affiliation(s)
- Bhaskar Basu
- Cancer Biology and Inflammatory Disorder Division, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology (CSIR-IICB), TRUE Campus, CN-6, Sector-V, Salt Lake, Kolkata- 700091 & 4, Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Satadeepa Kal
- Cancer Biology and Inflammatory Disorder Division, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology (CSIR-IICB), TRUE Campus, CN-6, Sector-V, Salt Lake, Kolkata- 700091 & 4, Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Subhajit Karmakar
- Cancer Biology and Inflammatory Disorder Division, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology (CSIR-IICB), TRUE Campus, CN-6, Sector-V, Salt Lake, Kolkata- 700091 & 4, Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Malini Basu
- Department of Microbiology, Dhruba Chand Halder College, Dakshin Barasat, South 24 Parganas, PIN -743372, India
| | - Mrinal K Ghosh
- Cancer Biology and Inflammatory Disorder Division, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology (CSIR-IICB), TRUE Campus, CN-6, Sector-V, Salt Lake, Kolkata- 700091 & 4, Raja S.C. Mullick Road, Jadavpur, Kolkata 700032, India.
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2
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Lin L, Wu X, Jiang Y, Deng C, Luo X, Han J, Hu J, Cao X. Down-regulated NEDD4L facilitates tumor progression through activating Notch signaling in lung adenocarcinoma. PeerJ 2022; 10:e13402. [PMID: 35646490 PMCID: PMC9138047 DOI: 10.7717/peerj.13402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 04/17/2022] [Indexed: 01/14/2023] Open
Abstract
Neural precursor cell expressed developmentally down-regulated 4-like protein (NEDD4L), an E3 ubiquitin ligase, exerts an important role in diverse biological processes including development, tumorigenesis, and tumor progression. Although the role of NEDD4L in the pathogenesis of lung adenocarcinoma (LUAD) has been described, the mechanism by which NEDD4L promotes LUAD progression remains poorly understood. In the study, the correlation between NEDD4L level and clinical outcome in LUAD patients was analysed using the data from The Cancer Genome Atlas (TCGA) database. NEDD4L expression in LUAD cell lines and tissue samples was assessed through quantitative real-time PCR (qRT-PCR). The biological function of NEDD4L on regulating LUAD cell proliferation was tested with Cell Counting Kit-8 (CCK-8) assay in vitro, and mouse xenograft tumor model in vivo. We found that NEDD4L expression was significantly decreased in LUAD tissues and cell lines. Lower expression of NEDD4L exhibited a significantly poorer overall survival. Functionally, NEDD4L knockdown in H1299 cells accelerated cell growth, whereas NEDD4L overexpression in A549 cells repressed cell proliferation. NEDD4L overexpression also inhibited tumor xenograft growth in vivo. Mechanistically, NEDD4L decreased the protein stability of notch receptor 2 (Notch2) through facilitating its ubiquitination and degradation by ubiquitin-proteasome system. Consequently, NEDD4L negatively regulated Notch signaling activation in LUAD cells, and RO4929097 (a Notch inhibitor) treatment effectively repressed the effect of NEDD4L knockdown on LUAD cell proliferation. Taken together, these results demonstrate that down-regulated NEDD4L facilitates LUAD progression by activating Notch signaling, and NEDD4L may be a promising target to treat LUAD.
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Affiliation(s)
- Liping Lin
- Department of Oncology, Panyu Central Hospital, Guangzhou, Guangdong Province, China,Cancer Institute of Panyu, Guangzhou, Guangdong Province, China
| | - Xuan Wu
- Department of Oncology, Peking University Shenzhen Hospital, Shenzhen, Guangdong Province, China
| | - Yuanxue Jiang
- Department of Oncology, Panyu Central Hospital, Guangzhou, Guangdong Province, China,Cancer Institute of Panyu, Guangzhou, Guangdong Province, China
| | - Caijiu Deng
- Department of Oncology, Panyu Central Hospital, Guangzhou, Guangdong Province, China,Cancer Institute of Panyu, Guangzhou, Guangdong Province, China
| | - Xi Luo
- Department of Oncology, Panyu Central Hospital, Guangzhou, Guangdong Province, China,Cancer Institute of Panyu, Guangzhou, Guangdong Province, China
| | - Jianjun Han
- Department of Oncology, Panyu Central Hospital, Guangzhou, Guangdong Province, China,Cancer Institute of Panyu, Guangzhou, Guangdong Province, China
| | - Jiazhu Hu
- Department of Oncology, Panyu Central Hospital, Guangzhou, Guangdong Province, China,Cancer Institute of Panyu, Guangzhou, Guangdong Province, China
| | - Xiaolong Cao
- Department of Oncology, Panyu Central Hospital, Guangzhou, Guangdong Province, China,Cancer Institute of Panyu, Guangzhou, Guangdong Province, China
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3
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Chen Y, Hong H, Wang Q, Li J, Zhang W, Chen T, Li P. NEDD4L-induced ubiquitination mediating UBE2T degradation inhibits progression of lung adenocarcinoma via PI3K-AKT signaling. Cancer Cell Int 2021; 21:631. [PMID: 34838005 PMCID: PMC8626996 DOI: 10.1186/s12935-021-02341-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 11/15/2021] [Indexed: 01/19/2023] Open
Abstract
Background A number of studies have indicated that Ubiquitin-conjugating enzyme E2T (UBE2T), as an oncogene, promotes progression and metastasis of lung cancer, including lung adenocarcinoma (LUAD), but it is completely unknown whether and how UBE2T is ubiquitylated and degraded, and by which E3 ligase. NEDD4L plays a critical role in the regulation of cellular processes of various cancers, most of which is attributed to its E3 ubiquitin ligase function. However, the relationship between NEDD4L and UBE2T in LUAD has not been elucidated. Methods The relationship between NEDD4L and UBE2T in LUAD tissues and cells was found by bioinformatic analyses and immunoblotting. Cell counting kit-8, colony formation assay, half-life analysis and the in vivo ubiquitylation assay, generation of xenograft model were performed to determine how NEDD4L regulates UBE2T and its downstream signaling pathway in vitro and in vivo. Results Bioinformatic analyses found that NEDD4L, as a potential correlation E3 ligase of UBE2T, was negatively correlated with UBE2T in LUAD. Consistently, UBE2T protein half-life was shortened or extended by NEDD4L overexpression or depletion, respectively. NEDD4L inhibited LUAD cell progression in vitro and in vivo via inducing the ubiquitination-mediated UBE2T degradation, which repressed PI3K-AKT signaling. Similarly, NEDD4L predicted a better patient survival, whereas UBE2T predicted a worse survival. Conclusions Collectively, our results reveal that NEDD4L is a novel E3 ligase of UBE2T, which can inhibit PI3K-AKT signaling by targeting for UBE2T ubiquitination and degradation, resulting in repression of LUAD cell progression.
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Affiliation(s)
- Yongbing Chen
- Department of Respiratory Medicine, Beilun Branch, Zhejiang University School of Medicine First Affiliated Hospital, Ningbo, 315800, China
| | - Haihua Hong
- Department of Respiratory Medicine, Beilun Branch, Zhejiang University School of Medicine First Affiliated Hospital, Ningbo, 315800, China
| | - Qingqing Wang
- Department of Respiratory Medicine, Beilun Branch, Zhejiang University School of Medicine First Affiliated Hospital, Ningbo, 315800, China
| | - Junqiang Li
- Department of Pathology, Beilun Branch, Zhejiang University School of Medicine First Affiliated Hospital, Ningbo, 315800, China
| | - Wenfeng Zhang
- Department of Infectious Disease, The First Affiliated Hospital, Nanchang University, Nanchang, 330052, China.
| | - Tingting Chen
- Department of Urology, The Second Affiliated Hospital, Third Military Medical University (Army Medical University), Chongqing, 400037, China.
| | - Pu Li
- State Drug Clinical Trial Agency, The First Affiliated Hospital, Nanchang University, Nanchang, 330052, China.
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4
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Zhao X, Yongchun Z, Qian H, Sanhui G, Jie L, Hong Y, Yanfei Z, Guizhen W, Yunchao H, Guangbiao Z. Identification of a potential tumor suppressor gene, UBL3, in non-small cell lung cancer. Cancer Biol Med 2021; 17:76-87. [PMID: 32296577 PMCID: PMC7142850 DOI: 10.20892/j.issn.2095-3941.2019.0279] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Accepted: 10/24/2019] [Indexed: 12/24/2022] Open
Abstract
Objective: Oncogenes have been shown to be drivers of non-small cell lung cancer (NSCLC), yet the tumor suppressing genes involved in lung carcinogenesis remain to be systematically investigated. This study aimed to identify tumor suppressing ubiquitin pathway genes (UPGs) that were critical to lung tumorigenesis. Methods: The 696 UPGs were silenced by an siRNA screening in NSCLC cells; the potential tumor suppressing UPGs were analyzed, and their clinical significance was investigated. Results: We reported that silencing of 11 UPGs resulted in enhanced proliferation of NSCLC cells, and four UPGs (UBL3, TRIM22, UBE2G2, and MARCH1) were significantly downregulated in tumor samples compared to that in normal lung tissues and their expression levels were positively associated with overall survival (OS) of NSCLC patients. Among these genes, UBL3 was the most significant one. UBL3 expression was decreased in tumor samples compared to that in paired normal lung tissues in 59/86 (68.6%) NSCLCs, was correlated with TNM stage and sex of NSCLC patients, and was significantly higher in non-smoking patients than in smoking patients. Silencing UBL3 accelerated cell proliferation and ectopic expression of UBL3 suppressed NSCLC in vitro and in vivo. Conclusions: These results showed that UBL3 represented a tumor suppressor in NSCLC and may have potential for use in therapeutics and for the prediction of clinical outcome of patients.
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Affiliation(s)
- Xinchun Zhao
- School of Life Sciences, University of Science and Technology of China, Hefei 230026, China.,State Key Laboratory of Molecular Oncology, National Cancer Center, National Clinical Research Center for Cancer, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China.,State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Zhou Yongchun
- Department of Thoracic Surgery, the Third Affiliated Hospital of Kunming Medical University, Kunming 650106, China
| | - Hu Qian
- State Key Laboratory of Molecular Oncology, National Cancer Center, National Clinical Research Center for Cancer, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China.,School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 100029, China
| | - Gao Sanhui
- State Key Laboratory of Molecular Oncology, National Cancer Center, National Clinical Research Center for Cancer, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China.,State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Liu Jie
- State Key Laboratory of Molecular Oncology, National Cancer Center, National Clinical Research Center for Cancer, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China.,State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Yu Hong
- State Key Laboratory of Molecular Oncology, National Cancer Center, National Clinical Research Center for Cancer, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China.,School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 100029, China
| | - Zhang Yanfei
- State Key Laboratory of Molecular Oncology, National Cancer Center, National Clinical Research Center for Cancer, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China.,State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Wang Guizhen
- State Key Laboratory of Molecular Oncology, National Cancer Center, National Clinical Research Center for Cancer, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China.,State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
| | - Huang Yunchao
- Department of Thoracic Surgery, the Third Affiliated Hospital of Kunming Medical University, Kunming 650106, China
| | - Zhou Guangbiao
- State Key Laboratory of Molecular Oncology, National Cancer Center, National Clinical Research Center for Cancer, Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China.,State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
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5
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Jin JO, Puranik N, Bui QT, Yadav D, Lee PCW. The Ubiquitin System: An Emerging Therapeutic Target for Lung Cancer. Int J Mol Sci 2021; 22:9629. [PMID: 34502538 PMCID: PMC8431782 DOI: 10.3390/ijms22179629] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 09/03/2021] [Accepted: 09/03/2021] [Indexed: 12/25/2022] Open
Abstract
The ubiquitin system, present in all eukaryotes, contributes to regulating multiple types of cellular protein processes such as cell signaling, cell cycle, and receptor trafficking, and it affects the immune response. In most types of cancer, unusual events in ubiquitin-mediated signaling pathway modulation can lead to a variety of clinical outcomes, including tumor formation and metastasis. Similarly, ubiquitination acts as a core component, which contributes to the alteration of cell signaling activity, dictating biosignal turnover and protein fates. As lung cancer acquires the most commonly mutated proteins, changes in the ubiquitination of the proteins contribute to the development of lung cancer. Various inhibitors targeting the ubiquitin system have been developed for clinical applications in lung cancer treatment. In this review, we summarize the current research advances in therapeutics for lung cancer by targeting the ubiquitin system.
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Affiliation(s)
- Jun-O Jin
- Shanghai Public Health Clinical Center & Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai 201508, China
- Department of Medical Biotechnology, Yeungnam University, Gyeongsan 38541, Korea
| | - Nidhi Puranik
- Biological Sciences Department, Bharathiar University, Coimbatore 641046, Tamil Nadu, India;
| | - Quyen Thu Bui
- Department of Biomedical Sciences, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea;
| | - Dhananjay Yadav
- Department of Medical Biotechnology, Yeungnam University, Gyeongsan 38541, Korea
| | - Peter Chang-Whan Lee
- Department of Biomedical Sciences, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea;
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6
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Guo M, Ding P, Zhu Z, Fan L, Zhou Y, Yang S, Yang Y, Gu C. Targeting RFWD2 as an Effective Strategy to Inhibit Cellular Proliferation and Overcome Drug Resistance to Proteasome Inhibitor in Multiple Myeloma. Front Cell Dev Biol 2021; 9:675939. [PMID: 33968945 PMCID: PMC8097052 DOI: 10.3389/fcell.2021.675939] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 03/30/2021] [Indexed: 12/15/2022] Open
Abstract
The potential to overcome resistance to proteasome inhibitors is greatly related with ubiquitin-proteasome system during multiple myeloma (MM) treatment process. The constitutive photomorphogenic 1 (RFWD2), referred to an E3 ubiquitin ligase, has been identified as an oncogene in multiple cancers, yet important questions on the role of RFWD2 in MM biology and treatment remain unclear. Here we demonstrated that MM patients with elevated RFWD2 expression achieved adverse outcome and drug resistance by analyzing gene expression profiling. Moreover, we proved that RFWD2 participated in the process of cell cycle, cell growth and death in MM by mass spectrometry analysis. In vitro study indicated that inducible knockdown of RFWD2 hindered cellular growth and triggered apoptosis in MM cells. Mechanism study revealed that RFWD2 controlled MM cellular proliferation via regulating the degradation of P27 rather than P53. Further exploration unveiled that RFWD2 meditated P27 ubiquitination via interacting with RCHY1, which served as an E3 ubiquitin ligase of P27. Finally, in vivo study illustrated that blocking RFWD2 in BTZ-resistant MM cells overcame the drug resistance in a myeloma xenograft mouse model. Taken together, these findings provide compelling evidence for prompting that targeting RFWD2 may be an effective strategy to inhibit cellular proliferation and overcome drug resistance to proteasome inhibitor in MM.
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Affiliation(s)
- Mengjie Guo
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China.,Large Data Center, Nanjing Hospital of Chinese Medicine affiliated to Nanjing University of Chinese Medicine, Nanjing, China
| | - Pinggang Ding
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Zhen Zhu
- College of Health and Rehabilitation & College of Acupuncture and Massage, Nanjing University of Chinese Medicine, Nanjing, China
| | - Lu Fan
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Yanyan Zhou
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Shu Yang
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Ye Yang
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Chunyan Gu
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, China.,Large Data Center, Nanjing Hospital of Chinese Medicine affiliated to Nanjing University of Chinese Medicine, Nanjing, China
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7
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Lan Q, Tan X, He P, Li W, Tian S, Dong W. TRIM11 Promotes Proliferation, Migration, Invasion and EMT of Gastric Cancer by Activating β-Catenin Signaling. Onco Targets Ther 2021; 14:1429-1440. [PMID: 33658804 PMCID: PMC7920621 DOI: 10.2147/ott.s289922] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 01/28/2021] [Indexed: 12/15/2022] Open
Abstract
Introduction Gastric cancer (GC) is the sixth most common malignant tumor and the third leading cause of cancer-related death in the world. Studies have shown that TRIM protein can regulate transcription factor activity and is associated with many cancers. However, the role of TRIM11 in gastric cancer remains unclear. Methods TRIM11 protein levels were examined in 36 cases of GC tissues and 4 gastric cancer cell lines. TRIM11 overexpression and knockdown cells were constructed in MGC-803, HGC-27 and SGC-7901, respectively. The biological roles and mechanisms of TRIM11 were examined using CCK8, colony formation, transwell migration assay, invasion assay, Western blotting, Immunohistochemistry and in vivo nude mice experiments. Results We found that TRIM11 was upregulated in gastric cancer tissues and gastric cancer cell lines. Functionally, TRIM11 overexpression increased growth rate, colony formation, invasion and migration ability, EMT and β-catenin protein level and its downstream proteins such as CyclinD1 and C-myc, while TRIM11 knockdown shows the opposite effects. Conclusion In summary, our data show that TRIM11 is overexpressed in GC. TRIM11 promotes proliferation, migration, invasion and EMT of gastric cancer by activating β-catenin signaling.
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Affiliation(s)
- Qingzhi Lan
- Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China.,Central Laboratory of Renmin Hospital, Wuhan, People's Republic of China
| | - Xiaoping Tan
- Department of Gastroenterology, The First Affiliated Hospital of Yangtze University, Jingzhou, People's Republic of China
| | - Pengzhan He
- Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China.,Central Laboratory of Renmin Hospital, Wuhan, People's Republic of China
| | - Wei Li
- Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China.,Central Laboratory of Renmin Hospital, Wuhan, People's Republic of China
| | - Shan Tian
- Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China.,Central Laboratory of Renmin Hospital, Wuhan, People's Republic of China
| | - Weiguo Dong
- Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan, People's Republic of China
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8
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Chen X, Wang Y, Qu X, Bie F, Wang Y, Du J. TRIM58 is a prognostic biomarker remodeling the tumor microenvironment in KRAS-driven lung adenocarcinoma. Future Oncol 2021; 17:565-579. [PMID: 33406903 DOI: 10.2217/fon-2020-0645] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Aim: To comprehensively analyze the expression profiles of ubiquitin-related genes (URGs) and determine potential biomarkers in KRAS-driven lung adenocarcinoma (LUAD). Materials & methods: Differential expression analyses were performed between KRAS-wild and KRAS-mutant LUAD samples from The Cancer Genome Atlas database, and 34 URGs were screened out. ESTIMATE and CIBERSORT methods were used to calculate the ratio of immune and stromal components. Results & conclusion: TRIM58 was positively correlated with abundances of M2 macrophages and resting mast cells and negatively correlated with follicular helper T-cell abundances in KRAS-driven LUAD. TRIM58 was a potential prognosis-associated indicator for tumor microenvironment modulation and played a key role in TME-specific AS landscapes alterations in KRAS-driven LUAD.
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Affiliation(s)
- Xiaowei Chen
- Institute of Oncology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250021, China
| | - Yu Wang
- Department of Respiratory Medicine, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250033, China
| | - Xiao Qu
- Institute of Oncology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250021, China
| | - Fenglong Bie
- Institute of Oncology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250021, China
| | - Yadong Wang
- Institute of Oncology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250021, China
| | - Jiajun Du
- Institute of Oncology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250021, China.,Department of Thoracic Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250021, China
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9
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Jiang Y, Huang Y, Du Y, Zhao Y, Ren J, Ma S, Wu C. Identification of Prognostic Genes and Pathways in Lung Adenocarcinoma Using a Bayesian Approach. Cancer Inform 2020; 16:1176935116684825. [PMID: 33354107 PMCID: PMC7736146 DOI: 10.1177/1176935116684825] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 11/24/2016] [Indexed: 01/02/2023] Open
Abstract
Lung cancer is the leading cause of cancer-associated mortality in the United States and the world. Adenocarcinoma, the most common subtype of lung cancer, is generally diagnosed at the late stage with poor prognosis. In the past, extensive effort has been devoted to elucidating lung cancer pathogenesis and pinpointing genes associated with survival outcomes. As the progression of lung cancer is a complex process that involves coordinated actions of functionally associated genes from cancer-related pathways, there is a growing interest in simultaneous identification of both prognostic pathways and important genes within those pathways. In this study, we analyse The Cancer Genome Atlas lung adenocarcinoma data using a Bayesian approach incorporating the pathway information as well as the interconnections among genes. The top 11 pathways have been found to play significant roles in lung adenocarcinoma prognosis, including pathways in mitogen-activated protein kinase signalling, cytokine-cytokine receptor interaction, and ubiquitin-mediated proteolysis. We have also located key gene signatures such as RELB, MAP4K1, and UBE2C. These results indicate that the Bayesian approach may facilitate discovery of important genes and pathways that are tightly associated with the survival of patients with lung adenocarcinoma.
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Affiliation(s)
- Yu Jiang
- Division of Epidemiology, Biostatistics
and Environmental Health, School of Public Health, University of Memphis, Memphis,
TN, USA
- Cooperative Studies Program, VA
Connecticut Healthcare System, West Haven, CT, USA
| | - Yuan Huang
- Cooperative Studies Program, VA
Connecticut Healthcare System, West Haven, CT, USA
- Department of Biostatistics, Yale
University, New Haven, CT, USA
| | - Yinhao Du
- Department of Statistics, Kansas State
University, Manhattan, KS, USA
| | - Yinjun Zhao
- Department of Biostatistics, Yale
University, New Haven, CT, USA
| | - Jie Ren
- Department of Statistics, Kansas State
University, Manhattan, KS, USA
| | - Shuangge Ma
- Cooperative Studies Program, VA
Connecticut Healthcare System, West Haven, CT, USA
- Department of Biostatistics, Yale
University, New Haven, CT, USA
| | - Cen Wu
- Department of Statistics, Kansas State
University, Manhattan, KS, USA
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10
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Liu X, Long Z, Cai H, Yu S, Wu J. TRIM58 suppresses the tumor growth in gastric cancer by inactivation of β-catenin signaling via ubiquitination. Cancer Biol Ther 2019; 21:203-212. [PMID: 31747856 PMCID: PMC7012179 DOI: 10.1080/15384047.2019.1679554] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 09/26/2019] [Accepted: 10/06/2019] [Indexed: 12/16/2022] Open
Abstract
Objective: To investigate and define the underlying molecular mechanism of tripartite motif-containing 58 (TRIM58) in regulating the tumor growth of gastric cancer (GC).Methods: TRIM58 expression in GC tissues and cells was detected by real-time PCR and Western blot, followed by lentiviral-induced overexpression or knockdown of TRIM58. Subsequently, CCK8, BrdU-ELISA, flow cytometry, immunoprecipitation, in vitro animal experiments and immunochemistry were performed to explore the function of TRIM58. Western blotting was used to detect β-catenin, C-myc, Cyclin D1, and survivin expression.Results: TRIM58 expression was significantly reduced in tumor tissues of GC patients and GC cell lines, whereas β-catenin, C-myc, Cyclin D1, and survivin were highly expressed. Overexpression of TRIM58 in GC cells resulted in decreases in β-catenin, C-myc, Cyclin D1, and survivin protein expression and significantly suppressed proliferation by preventing cell-cycle progression and promoting cell apoptosis. Conversely, TRIM58 knockdown resulted in the opposite effects. Furthermore, the effect of TRIM58 knockdown on GC cells was potently reversed by a β-catenin inhibitor, XAV939. Immunoprecipitations showed the interaction between TRIM58 and β-catenin, and TRIM58 overexpression significantly enhanced β-catenin degradation. In addition, we found a significant decrease in the growth and weight of tumors and an increase in tumor cell apoptosis in TRIM58-overexpression nude mice, which were also accompanied by reduced β-catenin expression.Conclusions: These data suggest that TRIM58 may function as a tumor suppressor in GC and potentially suppress the tumor growth of gastric cancer by inactivation of β-catenin signaling via ubiquitination.
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Affiliation(s)
- Xiaowen Liu
- Department of Gastric Surgery, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Ziwen Long
- Department of Gastric Surgery, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Hong Cai
- Department of Gastric Surgery, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Shengjia Yu
- Department of Gastric Surgery, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Jianghong Wu
- Department of Gastric Surgery, Fudan University Shanghai Cancer Center, Shanghai, China
- Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
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11
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Zhang Y, Zhao X, Zhou Y, Wang M, Zhou G. Identification of an E3 ligase-encoding gene RFWD3 in non-small cell lung cancer. Front Med 2019; 14:318-326. [DOI: 10.1007/s11684-019-0708-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 06/25/2019] [Indexed: 01/05/2023]
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12
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Miyamoto K, Saito K. Concise machinery for monitoring ubiquitination activities using novel artificial RING fingers. Protein Sci 2018; 27:1354-1363. [PMID: 29663561 DOI: 10.1002/pro.3427] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 04/11/2018] [Accepted: 04/11/2018] [Indexed: 01/20/2023]
Abstract
Protein ubiquitination is involved in many cellular processes, such as protein degradation, DNA repair, and signal transduction pathways. Ubiquitin-conjugating (E2) enzymes of the ubiquitination pathway are associated with various cancers, such as leukemia, lung cancer, and gastric cancer. However, to date, detection of E2 activities is not practicable for capturing the pathological conditions of cancers due to complications related to the enzymatic cascade reaction. To overcome this hurdle, we have recently investigated a novel strategy for measuring E2 activities. Artificial RING fingers (ARFs) were developed to conveniently detect E2 activities during the ubiquitination reaction. ARFs were created by grafting the active sites of ubiquitin-ligating (E3) enzymes onto amino acid sequences with 38 residues. The grafting design downsized E3s to small molecules (ARFs). Such an ARF is a multifunctional molecule that possesses specific E2-binding capabilities and ubiquitinates itself without a substrate. In this review, we discuss the major findings from recent investigations on a new molecular design for ARFs and their simplified detection system for E2 activities. The use of the ARF allowed us to monitor E2 activities using acute promyelocytic leukemia (APL)-derived cells following treatment with the anticancer drug bortezomib. The molecular design of ARFs is extremely simple and convenient, and thus, may be a powerful tool for protein engineering. The ARF methodology may reveal a new screening method of E2s that will contribute to diagnostic techniques for cancers.
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Affiliation(s)
- Kazuhide Miyamoto
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
| | - Kazuki Saito
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
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13
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Xie P, Horio F, Fujii I, Zhao J, Shinohara M, Matsukura M. A novel polysaccharide derived from algae extract inhibits cancer progression via JNK, not via the p38 MAPK signaling pathway. Int J Oncol 2018; 52:1380-1390. [PMID: 29512724 PMCID: PMC5873927 DOI: 10.3892/ijo.2018.4297] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 02/06/2018] [Indexed: 02/05/2023] Open
Abstract
Cancer has long been one of the most malignant diseases worldwide. Processes in cancer cells are often mediated by Jun N-terminal kinase (JNK), p38 mitogen-activated protein kinase (p38 MAPK) and other signaling pathways. Traditional therapies are often problematic. Recently, a novel polysaccharide derived from algae extract was investigated due to the increasing interest in biological activities of compounds from marine organisms. The effect of this novel polysaccharide on human MKN45 gastric carcinoma cells was determined previously. The current aimed to determine whether the polysaccharide affects other types of cancer, and the deeper mechanisms involved in the process. Human MCF-7 breast cancer cells were used to investigate the novel polysaccharide for its role in the cell growth and migration, and determine the mechanisms affected. MTT assay, nuclear staining and fluorescence activated cell sorting analysis demonstrated that the novel polysaccharide reduced the viability of MCF-7 cells by inducing cell apoptosis and arresting the cells at G2/M phase. Results of western blot analysis demonstrated that phosphorylation of JNK and expression of p53, caspase-9 and caspase-3 were upregulated in the polysaccharide-treated MCF-7 cells. SP600125, an inhibitor of JNK, maintained MCF-7 cell viability, prevented cell apoptosis and cycle arrest, and downregulated the polysaccharide-induced protein phosphorylation/expression. However, a migration assay demonstrated that the novel polysaccharide did not change the migration of MCF-7 cells, as well as the expression of p38 MAPK, and matrix metalloproteinase-9 and -2. Taken together, the current study demonstrated that the novel polysaccharide suppressed cancer cell growth, induced cancer cell apoptosis and cell cycle arrest via JNK signaling, but had no effect on cancer cell migration and p38 MAPK signaling.
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Affiliation(s)
- Peiyu Xie
- Laboratory of Clinical Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Sojo University, Kumamoto, Kumamoto 860-0822, Japan
| | - Fukuko Horio
- Laboratory of Clinical Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Sojo University, Kumamoto, Kumamoto 860-0822, Japan
| | - Isao Fujii
- Laboratory of Clinical Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Sojo University, Kumamoto, Kumamoto 860-0822, Japan
| | - Jien Zhao
- Ashikita Institution for Developmental Disabilities, Ashikita, Kumamoto 869-541, Japan
| | - Makoto Shinohara
- Ashikita Institution for Developmental Disabilities, Ashikita, Kumamoto 869-541, Japan
| | - Makoto Matsukura
- Laboratory of Clinical Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Sojo University, Kumamoto, Kumamoto 860-0822, Japan
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14
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Nyati S, Chaudhry N, Chatur A, Gregg BS, Kimmel L, Khare D, Basrur V, Ray D, Rehemtulla A. A novel reporter for real-time, quantitative imaging of AKT-directed K63-poly-ubiquitination in living cells. Oncotarget 2018. [PMID: 29541398 PMCID: PMC5834254 DOI: 10.18632/oncotarget.24323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Post-translational K63-linked poly-ubiquitination of AKT is required for its membrane recruitment and phosphorylation dependent activation in response to growth-factor stimulation. Current assays for target specific poly-ubiquitination involve cumbersome enzymatic preparations and semi-quantitative readouts. We have engineered a reporter that can quantitatively and in a target specific manner report on AKT-directed K63-polyubiquitination (K63UbR) in live cells. The reporter constitutes the AKT-derived poly-ubiquitination substrate peptide, a K63 poly-ubiquitin binding domain (UBD) as well as the split luciferase protein complementation domains. In cells, wherein signaling events upstream of AKT are activated (e.g. either EGFR or IGFR), poly-ubiquitination of the reporter leads to a stearic constraint that prevents luciferase complementation. However, upon inhibition of growth factor receptor signaling, loss of AKT poly-ubiquitination results in a decrease in interaction between the target peptide and the UBD, allowing for reconstitution of the split luciferase domains and therefore increased bioluminescence in a quantitative and dynamic manner. The K63UbR was confirmed to be suitable for high throughput screen (HTS), thus providing an excellent tool for small molecule or siRNA based HTS to discover new inhibitors or identify novel regulators of this key signaling node. Furthermore, the K63UbR platform could be adapted for non-invasive monitoring of additional target specific K63-polyubiquitination events in live cells.
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Affiliation(s)
- Shyam Nyati
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI-48109, USA
| | - Nauman Chaudhry
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI-48109, USA
| | - Areeb Chatur
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI-48109, USA
| | - Brandon S Gregg
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI-48109, USA
| | - Lauren Kimmel
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI-48109, USA
| | - Dheeraj Khare
- Life Sciences Institute, University of Michigan, Ann Arbor, MI-48109, USA
| | - Venkatesha Basrur
- UMCCC Proteomics Shared Resource, University of Michigan, Ann Arbor, MI-48109, USA.,Department of Pathology, University of Michigan, Ann Arbor, MI-48109, USA
| | - Dipankar Ray
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI-48109, USA
| | - Alnawaz Rehemtulla
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI-48109, USA
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15
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Zhang R, Wu X, Xia X, Khanniche A, Song F, Zhang B, Wang Y, Ge H. OVA12 promotes tumor growth by regulating p53 expression in human cancer cells. Oncotarget 2017; 8:52854-52865. [PMID: 28881777 PMCID: PMC5581076 DOI: 10.18632/oncotarget.17501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 04/10/2017] [Indexed: 11/30/2022] Open
Abstract
Ovarian cancer-associated antigen 12 (OVA12) was first identified in an ovarian carcinoma complementary DNA (cDNA) expression library and has been shown to play an important role in tumor growth. Here, we found that overexpression of OVA12 accelerated tumor growth in different tumor cells, whereas OVA12 depletion was associated with the opposite effect. Moreover, knocking down OVA12 led to a significant increase in the protein levels of p53, and the overexpression of OVA12 significantly decreased endogenous p53 levels. In addition, OVA12 stimulated p53 polyubiquitination and degradation by the proteasome and promoted tumor growth at least partially through the p53 pathway. Taken together, these results indicate that OVA12 is a negative regulator of p53 and that inhibition of OVA12 expression might serve as a therapeutic target to restore tumor suppression.
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Affiliation(s)
- Renfeng Zhang
- Department of Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Xicai Wu
- Clinical Laboratory, People's Hospital of Rizhao, Rizhao, China
| | - Xiangfeng Xia
- Department of Radiology, The Third People's Hospital of Rizhao, Rizhao, China
| | - Asma Khanniche
- Shanghai Institute of Immunology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Feifei Song
- Department of Pathology, Tenth People's Hospital of Tongji University, Shanghai, China
| | - Bingchang Zhang
- Department of Laboratory Medicine, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
| | - Ying Wang
- Shanghai Institute of Immunology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Hailiang Ge
- Shanghai Institute of Immunology, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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16
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Miyamoto K, Sumida M, Yuasa-Sunagawa M, Saito K. Highly sensitive detection of E2 activity in ubiquitination using an artificial RING finger. J Pept Sci 2017; 23:222-227. [PMID: 28093826 DOI: 10.1002/psc.2972] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Revised: 12/21/2016] [Accepted: 12/27/2016] [Indexed: 12/22/2022]
Abstract
The ubiquitin-conjugating (E2) enzymes of protein ubiquitination are associated with various diseases such as leukemia, lung cancer, and breast cancer. Rapid and accurate detection of E2 enzymatic activities remains poor. Here, we described the detection of E2 activity on a signal accumulation ISFET biosensor (AMIS sensor) using an artificial RING finger (ARF). The use of ARF enables the simplified detection of E2 activity without a substrate. The high-sensitivity quantitative detection of E2 activities was demonstrated via real-time monitoring over a response range of femtomolar to micromolar concentrations. Furthermore, the monitoring of E2 activities was successfully achieved using human acute promyelocytic leukemia cells following treatment with the anticancer drug bortezomib, which allowed the assessment of the pathological conditions. This strategy is extremely simple and convenient, and the present detection could be widely applied to specific E2s for various types of cancers. Copyright © 2017 European Peptide Society and John Wiley & Sons, Ltd.
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Affiliation(s)
- Kazuhide Miyamoto
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
| | - Miho Sumida
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
| | - Mayumi Yuasa-Sunagawa
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
| | - Kazuki Saito
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical Sciences, Himeji Dokkyo University, Hyogo, Japan
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17
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Xu J, Zhou W, Yang F, Chen G, Li H, Zhao Y, Liu P, Li H, Tan M, Xiong X, Sun Y. The β-TrCP-FBXW2-SKP2 axis regulates lung cancer cell growth with FBXW2 acting as a tumour suppressor. Nat Commun 2017; 8:14002. [PMID: 28090088 PMCID: PMC5241824 DOI: 10.1038/ncomms14002] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 11/21/2016] [Indexed: 12/17/2022] Open
Abstract
β-TrCP and SKP2 are two well-studied F-box proteins, which often act as oncogenes. Whether and how they communicate with each other is unknown. Here we report that FBXW2, a poorly characterized F-box, is a substrate of β-TrCP1 and an E3 ligase for SKP2. While β-TrCP1 promotes FBXW2 ubiquitylation and shortens its half-life, FBXW2 does the same to SKP2. FBXW2 has tumour suppressor activity against lung cancer cells and blocks oncogenic function of both β-TrCP1 and SKP2. The levels of β-TrCP1-FBXW2-SKP2 are inversely correlated during cell cycle with FBXW2 and β-TrCP/SKP2 being high or low, respectively, in arrested cells, whereas the opposite is true in proliferating cells. Consistently, FBXW2 predicts a better patient survival, whereas β-TrCP1 and SKP2 predict a worse survival. Finally, the gain- and loss-of-function mutations of FBXW2 are found in various human cancers. Collectively, our data show that the β-TrCP-FBXW2-SKP2 axis forms an oncogene-tumour suppressor-oncogene cascade to control cancer cell growth with FBXW2 acting as a tumour suppressor by promoting SKP2 degradation.
F-box proteins β-TrCP1 and SKP2 act as oncogenes by promoting targeted degradation of critical protein substrates. Here, the authors identify an axis of F-box proteins β-TrCP1-FBXW2-SKP2 where FBXW2 is a substrate of β-TrCP1 but mediates the degradation of SKP2, thus acting as a tumour suppressor.
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Affiliation(s)
- Jie Xu
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Weihua Zhou
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Fei Yang
- Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou 310029, China
| | - Guoan Chen
- Department of Surgery, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Haomin Li
- Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou 310029, China.,Affiliated Children Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - Yongchao Zhao
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109, USA.,Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou 310029, China.,Key laboratory of combined multi-organ transplantation, Ministry of Public Health, First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Pengyuan Liu
- Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou 310029, China.,Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310020, China
| | - Hua Li
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Mingjia Tan
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Xiufang Xiong
- Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou 310029, China
| | - Yi Sun
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan 48109, USA.,Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou 310029, China.,Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou 310058, China
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18
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Maus A, Peters GJ. Glutamate and α-ketoglutarate: key players in glioma metabolism. Amino Acids 2017; 49:21-32. [PMID: 27752843 PMCID: PMC5241329 DOI: 10.1007/s00726-016-2342-9] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 09/28/2016] [Indexed: 12/18/2022]
Abstract
Glioblastoma multiforme (GBM), or grade IV astrocytoma, is the most common type of primary brain tumor. It has a devastating prognosis with a 2-year-overall survival rate of only 26 % after standard treatment, which includes surgery, radiation, and adjuvant chemotherapy with temozolomide. Also lower grade gliomas are difficult to treat, because they diffusely spread into the brain, where extensive removal of tissue is critical. Better understanding of the cancer's biology is a key for the development of more effective therapy approaches. The discovery of isocitrate dehydrogenase (IDH) mutations in leukemia and glioma drew attention to specific metabolic aberrations in IDH-mutant gliomas. In the center of the metabolic alterations is α-ketoglutarate (αKG), an intermediate metabolite in the tricarboxylic acid (TCA) cycle, and the associated amino acid glutamate (Glu). This article highlights the role of these metabolites in glioma energy and lipid production and indicates possible weak spots of IDH-mutant and IDH-wt gliomas.
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Affiliation(s)
- Andreas Maus
- Department of Medical Oncology, VU University Medical Center, PO Box 7057, 1007 MB, Amsterdam, The Netherlands
- University of Gottingen, Gottingen, Germany
| | - Godefridus J Peters
- Department of Medical Oncology, VU University Medical Center, PO Box 7057, 1007 MB, Amsterdam, The Netherlands.
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19
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Lee YY, Wang CT, Huang SKH, Wu WJ, Huang CN, Li CC, Chan TC, Liang PI, Hsing CH, Li CF. Downregulation of RNF128 Predicts Progression and Poor Prognosis in Patients with Urothelial Carcinoma of the Upper Tract and Urinary Bladder. J Cancer 2016; 7:2187-2196. [PMID: 27994654 PMCID: PMC5166527 DOI: 10.7150/jca.16798] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 09/04/2016] [Indexed: 01/10/2023] Open
Abstract
Background: The TP53 tumor suppressor gene plays a crucial role in the carcinogenesis of many malignancies, including urothelial carcinoma (UC). Overexpression of p53 is associated with poor prognosis in UC. Recently, RING finger protein 128 (RNF128) was shown to be involved in p53-induced apoptosis, forming a negative feedback loop. However, the significance of RNF128 in patients with UC remains unknown. In this study, our aim was to evaluate the expression of RNF128 in UC and to assess its predictive and prognostic value in a well-established cohort. Methods: Through data mining from a published transcriptome (GSE31684), RNF128 was identified as the most differentially expressed gene in UC among those associated with negative regulation of the cytokine biosynthetic process (GO:0042036). Its immunoexpression was further evaluated using the H-scores of 340 patients with upper urinary tract UC (UTUC) and 295 with urinary bladder UC (UBUC). The scores were correlated with clinicopathological features, disease-specific survival (DSS) and metastasis-free survival (MeFS). We also used Western blot analysis to evaluate RNF128 protein expression in human urothelial cell (HUC) lines. Results: Downregulation of RNF128 expression was significantly associated with advanced pT stage (p<0.001), high histological grade (UTUC, p<0.001; UBUC, p=0.035), nodal metastasis (UTUC, p<0.001; UBUC, p=0.001), vascular invasion (UTUC, p<0.001; UBUC, p=0.008) and high mitotic rate (UTUC, p=0.003; UBUC, p=0.023). Low expression of RNF128 was an adverse prognosticator for DSS (UTUC, p<0.0001; UBUC, p<0.0001) and MeFS (UTUC, p<0.0001; UBUC, p=0.0002). Moreover, low expression was predictive of poor DSS (UTUC, p=0.006; UBUC, p=0.003) and MeFS (UTUC, p=0.009; UBUC, p=0.036) in multivariate comparisons. Western blot analysis showed that the RNF128 protein was downregulated in invasive urothelial cancer cell lines. Conclusion: Our findings showed that downregulation of RNF128 was correlated with cancer invasiveness and metastasis as well as reduced survival in patients with UTUC and UBUC, identifying RNF128 as a prognostic factor in UC.
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Affiliation(s)
- Yi-Ying Lee
- Department of Pathology, Chi Mei Medical Center, Liouying, Taiwan
- Institute of Biomedical Science National Sun Yat-sen University, Kaohsiung, Taiwan
| | - Chieh-Tien Wang
- Department of Pathology, Chi Mei Medical Center, Liouying, Taiwan
- Department of Medical Laboratory Science and Biotechnology, Chung Hwa University of Medical Technology
| | | | - Wen-Jeng Wu
- Department of Urology, Faculty of Medicine, Kaohsiung Medical University
- Department of Urology, Kaohsiung Medical University Hospital, Kaohsiung Medical University
- Department of Urology, Kaohsiung Municipal Ta-Tung Hospital
| | - Chun-Nung Huang
- Department of Urology, Faculty of Medicine, Kaohsiung Medical University
- Department of Urology, Kaohsiung Medical University Hospital, Kaohsiung Medical University
| | - Ching-Chia Li
- Department of Urology, Faculty of Medicine, Kaohsiung Medical University
- Department of Urology, Kaohsiung Medical University Hospital, Kaohsiung Medical University
- Department of Urology, Kaohsiung Municipal Ta-Tung Hospital
| | - Ti-Chun Chan
- Institute of Biomedical Science National Sun Yat-sen University, Kaohsiung, Taiwan
| | - Peir-In Liang
- Department of Pathology, Kaohsiung Medical University Hospital, Kaohsiung Medical University
| | - Chung-Hsi Hsing
- Department of Anesthesiology, Chi Mei Medical Center, Tainan, Taiwan
| | - Chien-Feng Li
- Division of Clinical Pathology, Chi Mei Medical Center, Tainan, Taiwan
- National Institute of Cancer Research, National Health Research Institutes, Tainan, Taiwan
- Department of Biotechnology, Southern Taiwan University of Science and Technology, Tainan, Taiwan
- Institute of Clinical Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
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20
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Jeganathan N, Predescu D, Zhang J, Sha F, Bardita C, Patel M, Wood S, Borgia JA, Balk RA, Predescu S. Rac1-mediated cytoskeleton rearrangements induced by intersectin-1s deficiency promotes lung cancer cell proliferation, migration and metastasis. Mol Cancer 2016; 15:59. [PMID: 27629044 PMCID: PMC5024437 DOI: 10.1186/s12943-016-0543-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 09/06/2016] [Indexed: 12/21/2022] Open
Abstract
Background The mechanisms involved in lung cancer (LC) progression are poorly understood making discovery of successful therapies difficult. Adaptor proteins play a crucial role in cancer as they link cell surface receptors to specific intracellular pathways. Intersectin-1s (ITSN-1s) is an important multidomain adaptor protein implicated in the pathophysiology of numerous pulmonary diseases. To date, the role of ITSN-1s in LC has not been studied. Methods Human LC cells, human LC tissue and A549 LC cells stable transfected with myc-ITSN-1s construct (A549 + ITSN-1s) were used in correlation with biochemical, molecular biology and morphological studies. In addition scratch assay with time lapse microscopy and in vivo xenograft tumor and mouse metastasis assays were performed. Results ITSN-1s, a prevalent protein of lung tissue, is significantly downregulated in human LC cells and LC tissue. Restoring ITSN-1s protein level decreases LC cell proliferation and clonogenic potential. In vivo studies indicate that immunodeficient mice injected with A549 + ITSN-1s cells develop less and smaller metastatic tumors compared to mice injected with A549 cells. Our studies also show that restoring ITSN-1s protein level increases the interaction between Cbl E3 ubiquitin ligase and Eps8 resulting in enhanced ubiquitination of the Eps8 oncoprotein. Subsequently, downstream unproductive assembly of the Eps8-mSos1 complex leads to impaired activation of the small GTPase Rac1. Impaired Rac1 activation mediated by ITSN-1s reorganizes the cytoskeleton (increased thick actin bundles and focal adhesion (FA) complexes as well as collapse of the vimentin filament network) in favor of decreased LC cell migration and metastasis. Conclusion ITSN-1s induced Eps8 ubiquitination and impaired Eps8-mSos1 complex formation, leading to impaired activation of Rac1, is a novel signaling mechanism crucial for abolishing the progression and metastatic potential of LC cells. Electronic supplementary material The online version of this article (doi:10.1186/s12943-016-0543-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Niranjan Jeganathan
- Division of Pulmonary and Critical Care Medicine, Rush University Medical Center and Rush Medical College, 1750 W. Harrison Street, 299 Jelke South Center, Chicago, IL, 60612, USA.
| | - Dan Predescu
- Department of Pharmacology and Division of Pulmonary and Critical Care Medicine, Rush University, 1750 W. Harrison Street, 1415 Jelke, Chicago, IL, 60612, USA
| | - Jin Zhang
- Department of Pharmacology, Rush University, 1750 W. Harrison Street, 1533 Jelke, Chicago, IL, 60612, USA
| | - Fei Sha
- Department of Pharmacology, Rush University, 1750 W. Harrison Street, 1533 Jelke, Chicago, IL, 60612, USA
| | - Cristina Bardita
- Department of Pharmacology, Rush University, 1750 W. Harrison Street, 1537 Jelke, Chicago, IL, 60612, USA
| | - Monal Patel
- Department of Pharmacology, Rush University, 1750 W. Harrison Street, 1533 Jelke, Chicago, IL, 60612, USA
| | - Stephen Wood
- Department of Immunology, Rush University, 1735 W. Harrison Street, 663 Cohn, Chicago, IL, 60612, USA
| | - Jeffrey A Borgia
- Department of Biochemistry, Rush University, 1750 W. Harrison Street, 1415 Jelke, Chicago, IL, 60612, USA
| | - Robert A Balk
- Division of Pulmonary and Critical Care Medicine, Rush University Medical Center and Rush Medical College, 1750 W. Harrison Street, 293 Jelke, Chicago, IL, 60612, USA
| | - Sanda Predescu
- Department of Pharmacology and Division of Pulmonary and Critical Care Medicine, Rush University Medical Center and Rush Medical College, 1750 W. Harrison Street, 1535 Jelke, Chicago, IL, 60612, USA
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21
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Zhou W, Xu J, Li H, Xu M, Chen ZJ, Wei W, Pan Z, Sun Y. Neddylation E2 UBE2F Promotes the Survival of Lung Cancer Cells by Activating CRL5 to Degrade NOXA via the K11 Linkage. Clin Cancer Res 2016; 23:1104-1116. [PMID: 27591266 DOI: 10.1158/1078-0432.ccr-16-1585] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Revised: 08/05/2016] [Accepted: 08/17/2016] [Indexed: 01/09/2023]
Abstract
Purpose: Recent studies have shown that the process of protein neddylation was abnormally activated in several human cancers. However, it is unknown whether and how UBE2F, a less characterized neddylation E2, regulates lung cancer cell survival, and whether and how NOXA, a proapoptotic protein, is ubiquitylated and degraded by which E3 and via which ubiquitin linkage.Experimental Design: Methods of immunohistochemistry and immunoblotting were utilized to examine UBE2F protein expression. The biological functions of UBE2F were evaluated by in vitro cell culture and in vivo xenograft models. The in vivo complex formation among UBE2F-SAG-CUL5-NOXA was measured by a pulldown assay. Polyubiquitylation of NOXA was evaluated by in vivo and in vitro ubiquitylation assays.Results: UBE2F is overexpressed in non-small cell lung cancer (NSCLC) and predicts poor patient survival. While UBE2F overexpression promotes lung cancer growth both in vitro and in vivo, UBE2F knockdown selectively inhibits tumor growth. By promoting CUL5 neddylation, UBE2F/SAG/CUL5 tri-complex activates CRL5 (Cullin-RING-ligase-5) to ubiquitylate NOXA via a novel K11, but not K48, linkage for targeted proteasomal degradation. CRL5 inactivation or forced expression of K11R ubiquitin mutant caused NOXA accumulation to induce apoptosis, which is rescued by NOXA knockdown. Notably, NOXA knockdown rescues the UBE2F silencing effect, indicating a causal role of NOXA in this process. In lung cancer tissues, high levels of UBE2F and CUL5 correlate with a low level of NOXA and poor patient survival.Conclusions: By ubiquitylating and degrading NOXA through activating CRL5, UBE2F selectively promotes lung cancer cell survival and could, therefore, serve as a novel cancer target. Clin Cancer Res; 23(4); 1104-16. ©2016 AACR.
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Affiliation(s)
- Weihua Zhou
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan
| | - Jie Xu
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan
| | - Haomin Li
- Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China.,Children's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
| | - Ming Xu
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas
| | - Zhijian J Chen
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas.,Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas
| | - Wenyi Wei
- Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
| | - Zhenqiang Pan
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Yi Sun
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan. .,Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China.,Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou, China
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Xie P, Fujii I, Zhao J, Shinohara M, Matsukura M. A novel polysaccharide derived from algae extract induces apoptosis and cell cycle arrest in human gastric carcinoma MKN45 cells via ROS/JNK signaling pathway. Int J Oncol 2016; 49:1561-1568. [DOI: 10.3892/ijo.2016.3658] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Accepted: 08/18/2016] [Indexed: 11/05/2022] Open
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23
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Huang KY, Weng JTY, Lee TY, Weng SL. A new scheme to discover functional associations and regulatory networks of E3 ubiquitin ligases. BMC SYSTEMS BIOLOGY 2016; 10 Suppl 1:3. [PMID: 26818115 PMCID: PMC4895279 DOI: 10.1186/s12918-015-0244-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Background Protein ubiquitination catalyzed by E3 ubiquitin ligases play important modulatory roles in various biological processes. With the emergence of high-throughput mass spectrometry technology, the proteomics research community embraced the development of numerous experimental methods for the determination of ubiquitination sites. The result is an accumulation of ubiquitinome data, coupled with a lack of available resources for investigating the regulatory networks among E3 ligases and ubiquitinated proteins. In this study, by integrating existing ubiquitinome data, experimentally validated E3 ligases and established protein-protein interactions, we have devised a strategy to construct a comprehensive map of protein ubiquitination networks. Results In total, 41,392 experimentally verified ubiquitination sites from 12,786 ubiquitinated proteins of humans have been obtained for this study. Additional 494 E3 ligases along with 1220 functional annotations and 28588 protein domains were manually curated. To characterize the regulatory networks among E3 ligases and ubiquitinated proteins, a well-established network viewer was utilized for the exploration of ubiquitination networks from 40892 protein-protein interactions. The effectiveness of the proposed approach was demonstrated in a case study examining E3 ligases involved in the ubiquitination of tumor suppressor p53. In addition to Mdm2, a known regulator of p53, the investigation also revealed other potential E3 ligases that may participate in the ubiquitination of p53. Conclusion Aside from the ability to facilitate comprehensive investigations of protein ubiquitination networks, by integrating information regarding protein-protein interactions and substrate specificities, the proposed method could discover potential E3 ligases for ubiquitinated proteins. Our strategy presents an efficient means for the preliminary screen of ubiquitination networks and overcomes the challenge as a result of limited knowledge about E3 ligase-regulated ubiquitination. Electronic supplementary material The online version of this article (doi:10.1186/s12918-015-0244-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Kai-Yao Huang
- Department of Computer Science and Engineering, Yuan Ze University, Taoyuan, 320, Taiwan.
| | - Julia Tzu-Ya Weng
- Department of Computer Science and Engineering, Yuan Ze University, Taoyuan, 320, Taiwan. .,Innovation Center for Big Data and Digital Convergence, Yuan Ze University, Taoyuan, 320, Taiwan.
| | - Tzong-Yi Lee
- Department of Computer Science and Engineering, Yuan Ze University, Taoyuan, 320, Taiwan. .,Innovation Center for Big Data and Digital Convergence, Yuan Ze University, Taoyuan, 320, Taiwan.
| | - Shun-Long Weng
- Department of Obstetrics and Gynecology, Hsinchu Mackay Memorial Hospital, Hsin-Chu, 300, Taiwan. .,Mackay Junior College of Medicine, Nursing and Management, Taipei, 112, Taiwan. .,Department of Medicine, Mackay Medical College, New Taipei City, 252, Taiwan.
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Wang H, Wei L, Li C, Zhou J, Li Z. CDK5RAP1 deficiency induces cell cycle arrest and apoptosis in human breast cancer cell line by the ROS/JNK signaling pathway. Oncol Rep 2015; 33:1089-96. [PMID: 25607831 DOI: 10.3892/or.2015.3736] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 08/21/2014] [Indexed: 11/06/2022] Open
Abstract
Cyclin-dependent kinase 5 regulatory subunit associated protein 1 (CDK5RAP1) is an enzyme which post-synthetically converts the RNA modification N6-iso-pentenyladenosine (i6A) into 2-methylthio-N6-isopentenyladenosine (ms2i6A). However, the interaction between CDK5RAP1 deficiency and cell apoptosis has not been studied. Breast cancer has long been a leading cause of mortality in the world. Therefore, in the present study, CDK5RAP1 deficiency in a human breast cancer cell line was investigated. CDK5RAP1 small interfering RNA (siRNA) and negative control siRNA were transfected into MCF-7 cells, and the cells were further incubated for 48 h. CDK5RAP1 deficiency suppressed tumor growth in MCF-7 cells and arrested the cells at G2/M phase. CDK5RAP1 deficiency also induced cell apoptosis and reactive oxygen species (ROS) generation. Furthermore, western blot analysis showed that the expression of phospho-c-Jun N-terminal kinase (p-JNK), p53, caspase-9 and caspase-3 were upregulated in CDK5RAP1-deficient MCF-7 cells. Pretreatment with N-acetyl-cysteine (NAC), the inhibitor of ROS, or with SP600125, the inhibitor of JNK, prevented the apoptosis and the high expression of p-JNK, p53, caspase-9 and caspase-3 in CDK5RAP1-deficient MCF-7 cells. Taken together, these data indicated that CDK5RAP1 deficiency induced cell cycle arrest and apoptosis in human breast cancer MCF-7 cells by the ROS/JNK signaling pathway. Our findings indicated a novel therapeutic strategy for cancer.
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Affiliation(s)
- Hongbin Wang
- Department of Breast Surgery, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Li Wei
- Department of Breast Surgery, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Changli Li
- Department of Breast Surgery, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Jing Zhou
- Department of Breast Surgery, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Zhigao Li
- Department of Breast Surgery, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
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25
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Structural model of ubiquitin transfer onto an artificial RING finger as an E3 ligase. Sci Rep 2014; 4:6574. [PMID: 25300604 PMCID: PMC4192618 DOI: 10.1038/srep06574] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Accepted: 09/11/2014] [Indexed: 11/08/2022] Open
Abstract
The artificial WSTF PHD_EL5 RING finger was designed via "α-helical region substitution", and its structural model for the attachment of activated ubiquitin has been demonstrated. Chemical modifications of Cys residues, the circular dichroism spectra, and substrate-independent ubiquitination assays illustrated that the WSTF PHD_EL5 RING finger has E3 activity, and it is ubiquitinated via Lys14. Homology modeling calculations revealed that the WSTF PHD_EL5 RING finger possesses a classical RING fold for specific E2-E3 binding. The docking poses of the WSTF PHD_EL5 RING finger with the UbcH5b-ubiquitin conjugate provided insight into its functional E2 interaction and development of ubiquitination at the atomic level. The structural model of the artificial WSTF PHD_EL5 RING finger proposed by the present work is useful and may help to extend the strategy of α-helical region substitution.
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Liao YJ, Bai HY, Li ZH, Zou J, Chen JW, Zheng F, Zhang JX, Mai SJ, Zeng MS, Sun HD, Pu JX, Xie D. Longikaurin A, a natural ent-kaurane, induces G2/M phase arrest via downregulation of Skp2 and apoptosis induction through ROS/JNK/c-Jun pathway in hepatocellular carcinoma cells. Cell Death Dis 2014; 5:e1137. [PMID: 24651440 PMCID: PMC3973226 DOI: 10.1038/cddis.2014.66] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Revised: 01/15/2014] [Accepted: 01/27/2014] [Indexed: 12/26/2022]
Abstract
Hepatocellular carcinoma (HCC) is the most common form of primary liver cancer, and is also highly resistant to conventional chemotherapy treatments. In this study, we report that Longikaurin A (LK-A), an ent-kaurane diterpenoid isolated from the plant Isodon ternifolius, induced cell cycle arrest and apoptosis in human HCC cell lines. LK-A also suppressed tumor growth in SMMC-7721 xenograft models, without inducing any notable major organ-related toxicity. LK-A treatment led to reduced expression of the proto-oncogene S phase kinase-associated protein 2 (Skp2) in SMMC-7721 cells. Lower Skp2 levels correlated with increased expression of p21 and p-cdc2 (Try15), and a corresponding decrease in protein levels of Cyclin B1 and cdc2. Overexpression of Skp2 significantly inhibited LK-A-induced cell cycle arrest in SMMC-7721 cells, suggesting that LK-A may target Skp2 to arrest cells at the G2/M phase. LK-A also induced reactive oxygen species (ROS) production and apoptosis in SMMC-7721 cells. LK-A induced phosphorylation of c-Jun N-terminal kinase (JNK), but not extracellular signal-regulated kinase and P38 MAP kinase. Treatment with, the JNK inhibitor SP600125 prevented LK-A-induced apoptosis in SMMC-7721 cells. Moreover, the antioxidant N-acetylcysteine prevented phosphorylation of both JNK and c-Jun. Taken together, these data indicate that LK-A induces cell cycle arrest and apoptosis in cancer cells by dampening Skp2 expression, and thereby activating the ROS/JNK/c-Jun signaling pathways. LK-A is therefore a potential lead compound for development of antitumor drugs targeting HCC.
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Affiliation(s)
- Y-J Liao
- Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - H-Y Bai
- 1] Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China [2] Department of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
| | - Z-H Li
- Department of Forensic Medicine, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, China
| | - J Zou
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - J-W Chen
- Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - F Zheng
- Medical Research Center, Sun Yat-Sen Memorial Hospital, Guangzhou, China
| | - J-X Zhang
- Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - S-J Mai
- Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - M-S Zeng
- Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - H-D Sun
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - J-X Pu
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - D Xie
- Sun Yat-Sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
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