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Zuccotti A, Carretero R, Hess-Stumpp H. The Alliance Between the German Cancer Research Center and Bayer: A Retrospective of an Innovative Collaboration Model. Handb Exp Pharmacol 2024. [PMID: 39177747 DOI: 10.1007/164_2024_726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/24/2024]
Abstract
In 2009, the German Cancer Research Center (DKFZ) and the biopharmaceutical company Bayer AG initiated an academic-industry co-discovery collaboration. The partners combined their expertise in tumor biology and drug discovery to identify and validate novel targets for cancer treatment. In the early phase of the Alliance, the focus was on target identification and validation projects. Over time, both partners realized that they could also successfully collaborate on later stages of drug discovery. As a result over the past few years, and following several contract extensions, the two partners have collaborated on several late-stage drug discovery projects. This has resulted in the achievement of several drug discovery milestones and the initiation of early clinical trials, the most recent in 2022. This success has been possible thanks to both partners' understanding of each other's needs and challenges. They jointly developed solutions to issues such as the intrinsic potential conflict of early publishing versus patent protection. Both partners also appreciated the risks involved in some of the experiments, such as starting a joint laboratory for immune-therapy with scientists from both parties working bench-to-bench. Recently, despite these successes the partners decided to terminate the Alliance, as Bayer AG wants to focus its activities on the development of its late pipeline.
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Affiliation(s)
- A Zuccotti
- German Cancer Research Center (DKFZ), Innovation Management, Heidelberg, Germany
| | - R Carretero
- Bayer AG, Immune-Oncology DKFZ Joint Lab, Heidelberg, Germany
| | - H Hess-Stumpp
- German Cancer Research Center (DKFZ), Innovation Management, Heidelberg, Germany.
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2
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Zhou Q, Gao X, Xu H, Lu X. Non-apoptotic regulatory cell death scoring system to predict the clinical outcome and drug choices in breast cancer. Heliyon 2024; 10:e31342. [PMID: 38813233 PMCID: PMC11133894 DOI: 10.1016/j.heliyon.2024.e31342] [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: 01/13/2024] [Revised: 05/10/2024] [Accepted: 05/14/2024] [Indexed: 05/31/2024] Open
Abstract
Background Breast cancer (BC), the most common cancer among women globally, has been shown by numerous studies to significantly involve non-apoptotic regulatory cell death (RCD) in its pathogenesis and progression. Methods We obtained the RNA sequences and clinical data of BC patients from The Cancer Genome Atlas (TCGA) database for the training set, while datasets GSE96058, GSE86166, and GSE20685 from The Gene Expression Omnibus (GEO) database were utilized as validation cohorts. Initially, we performed non-negative matrix factorization (NMF) clustering analysis on the BC samples from the TCGA database to discern non-apoptotic RCD-related molecular subtypes. To identify prognostically-relevant non-apoptotic RCD genes (NRGs) and construct a prognostic model, we implemented three machine learning algorithms: lasso regression, random forest, and XGBoost analysis. The expression of selected genes was verified using real-time quantitative polymerase chain reaction (RT-qPCR), single-cell RNA-sequencing (scRNA-seq) analysis, and The Human Protein Atlas (HPA) database. The risk signature was evaluated concerning clinical characteristics and drug sensitivity. Furthermore, we developed a nomogram to predict BC patient survival. Results The NMF method successfully compartmentalized patients from the TCGA database into three distinct non-apoptotic RCD-related subtypes, with significant variations observed in immune characteristics and prognostic stratification across these subtypes. We identified 5 differentially expressed NRGs used in establishing the risk signature. Patients with different risk groups exhibited distinct clinicopathological features, drug sensitivity, and prognostic outcomes. A nomogram was subsequently developed, incorporating the NRGs-related risk signature, age, T stage, and N stage, to aid clinical decision-making. Conclusion We identified a novel NRGs-related risk signature, which was expected to become a potential prognostic marker in BC.
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Affiliation(s)
| | | | - Hui Xu
- Department of Thyroid and Breast Surgery, The Affiliated Hospital of Yangzhou University, Yangzhou University, Yangzhou, 225001, China
| | - Xuan Lu
- Department of Thyroid and Breast Surgery, The Affiliated Hospital of Yangzhou University, Yangzhou University, Yangzhou, 225001, China
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Sun C, Zhang H, Li Y, Yu Y, Liu J, Liu R, Sun C. Elucidation of clinical implications Arising from circadian rhythm and insights into the tumor immune landscape in breast cancer. Heliyon 2024; 10:e27356. [PMID: 38500978 PMCID: PMC10945177 DOI: 10.1016/j.heliyon.2024.e27356] [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: 10/07/2023] [Revised: 02/03/2024] [Accepted: 02/28/2024] [Indexed: 03/20/2024] Open
Abstract
Background Circadian rhythm is an internal timing system generated by circadian-related genes (CRGs). Disruption in this rhythm has been associated with a heightened risk of breast cancer (BC) and regulation of the immune microenvironment of tumors. This study aimed to investigate the clinical significance of CRGs in BC and the immune microenvironment. Methods CRGs were identified using the GeneCards and MSigDB databases. Through unsupervised clustering, we identified two circadian-related subtypes in patients with BC. We constructed a prognostic model and nomogram for circadian-related risk scores using LASSO and Cox regression analyses. Using multi-omics analysis, the mutation profile and immunological microenvironment of tumors were investigated, and the immunotherapy response in different groups of patients was predicted based on their risk strata. Results The two circadian-related subtypes of BC that were identified differed significantly in their prognoses, clinical characteristics, and tumor immune microenvironments. Subsequently, we constructed a circadian-related risk score (CRRS) model containing eight signatures (SIAH2, EZR, GSN, TAGLN2, PRDX1, MCM4, EIF4EBP1, and CD248) and a nomogram. High-risk individuals had a greater burden of tumor mutations, richer immune cell infiltration, and higher expression of immune checkpoint genes, than low-risk individuals, indicating a "hot tumor" immune phenotype and a more favorable treatment outcome. Conclusions Two circadian-related subtypes of BC were identified and used to establish a CRRS prognostic model and nomogram. These will be valuable in providing guidance for forecasting prognosis and developing personalized treatment plans for BC.
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Affiliation(s)
- Chunjie Sun
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, 250355 Shandong, China
| | - Hanyun Zhang
- College of First Clinical Medicine, Shandong University of Traditional Chinese Medicine, Jinan, 250355 Shandong, China
| | - Ye Li
- Faculty of Chinese Medicine and State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau, Taipa, 999078, China
| | - Yang Yu
- Faculty of Chinese Medicine and State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau, Taipa, 999078, China
| | - Jingyang Liu
- Faculty of Chinese Medicine and State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau, Taipa, 999078, China
| | - Ruijuan Liu
- Department of Oncology, Weifang Traditional Chinese Hospital, Weifang, 261041 Shandong, China
| | - Changgang Sun
- Department of Oncology, Weifang Traditional Chinese Hospital, Weifang, 261041 Shandong, China
- College of Traditional Chinese Medicine, Shandong Second Medical University, Weifang, 261053 Shandong, China
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4
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Miyamoto K, Tadokoro T, Matsumoto A. Unique E2-binding specificity of artificial RING fingers in cancer cells. Sci Rep 2024; 14:2545. [PMID: 38291082 PMCID: PMC10828389 DOI: 10.1038/s41598-024-52793-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 01/23/2024] [Indexed: 02/01/2024] Open
Abstract
Ubiquitin (Ub)-conjugating enzymes (E2s) are involved in various pathways for Ub transfer and deubiquitinating activities. These enzymes are associated with cancers such as breast cancer which is the second deadliest type of malignancy among women. Here, we revealed the unique E2-binding property and the auto-ubiquitination of artificial RING fingers (ARFs). Circular dichroism spectra showed the characteristic structures of ARFs. The proline, lysine, leucine, threonine and cysteine (PKLTC) sequence of ARF was important for E2-recognition and its mutations induced obvious changes in the E2-binding specificity and the auto-ubiquitination activity of ARF. The ARF mutants were applicable to detection of most of E2 activities. Furthermore, adding the ARF mutant C35A to cancer cells promoted its auto-ubiquitination, leading to the preferential detection of E2 UbcH5b activity. The present work opens up a new avenue for investigating intracellular E2 activities for the fatal diseases.
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Affiliation(s)
- Kazuhide Miyamoto
- Faculty of Pharmaceutical Sciences, Sanyo-Onoda City University, 1-1-1 Daigaku-dori, Sanyo-Onoda, Yamaguchi, 756-0884, Japan.
| | - Takashi Tadokoro
- Faculty of Pharmaceutical Sciences, Sanyo-Onoda City University, 1-1-1 Daigaku-dori, Sanyo-Onoda, Yamaguchi, 756-0884, Japan
| | - Atsushi Matsumoto
- Faculty of Pharmaceutical Sciences, Sanyo-Onoda City University, 1-1-1 Daigaku-dori, Sanyo-Onoda, Yamaguchi, 756-0884, Japan
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Miyamoto K, Matsumoto A. Artificial RING finger reveals unique auto-ubiquitination with E2 specificity. Protein Sci 2023; 32:e4766. [PMID: 37622280 PMCID: PMC10510468 DOI: 10.1002/pro.4766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 08/08/2023] [Accepted: 08/21/2023] [Indexed: 08/26/2023]
Abstract
Ubiquitin (Ub)-conjugating enzymes (E2s) transfer activated Ub from Ub-activating enzymes (E1s) to substrates and are associated with various cancers and neurological disorders. In this study, the unique properties of E2-binding and auto-ubiquitination of artificial RING fingers (ARFs) were demonstrated in ubiquitination assays. Circular dichroism spectra indicated the characteristic structures of ARFs. Point mutations of 31 PKLTC35 in ARF by tryptophan (Trp) resulted in dramatic changes in E2 specificity and the type of Ub chain elongation of mono- and polyubiquitination. The Trp residue was a cue that changed the ubiquitination activity of ARF via E2-binding. Furthermore, the ARF mutants interacted with all 11 E2s and then promoted auto-ubiquitination. Thus, the use of the ARF mutants allowed specific detection of E2 activities during ubiquitination. The present study opens up a new avenue for researching E2 activities related to the fatal diseases.
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Affiliation(s)
- Kazuhide Miyamoto
- Faculty of Pharmaceutical Sciences, Sanyo-Onoda City University, Yamaguchi, Japan
| | - Atsushi Matsumoto
- Faculty of Pharmaceutical Sciences, Sanyo-Onoda City University, Yamaguchi, Japan
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George M, Masamba P, Iwalokun BA, Kappo AP. Zooming into the structure-function of RING finger proteins for anti-cancer therapeutic applications. Am J Cancer Res 2023; 13:2773-2789. [PMID: 37559981 PMCID: PMC10408477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Accepted: 05/22/2023] [Indexed: 08/11/2023] Open
Abstract
Cancer is one of the most common and widely diagnosed diseases worldwide. With an increase in prevalence and incidence, many studies in cancer biology have been looking at the role pro-cancer proteins play. One of these proteins is the Really Interesting New Gene (RING), which has been studied extensively due to its structure and functions such as apoptosis, neddylation, and its role in ubiquitination. The RING domain is a cysteine-rich domain known to bind Cysteine and Histidine residues. It also binds two zinc ions that help stabilize the protein in various patterns, often with a 'cross-brace' topology. Different RING finger proteins have been studied and found to have suitable targets for developing anti-cancer therapeutics. These identified candidate proteins include Parkin, COP1, MDM2, BARD1, BRCA-1, PIRH2, c-CBL, SIAH1, RBX1 and RNF8. Inhibiting these candidate proteins provides opportunities for shutting down pathways associated with tumour development and metastasis.
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Affiliation(s)
- Mary George
- Molecular Biophysics and Structural Biology (MBSB) Group, Department of Biochemistry, Faculty of Science, University of Johannesburg, Auckland Park Kingsway CampusAuckland Park, Johannesburg, South Africa
| | - Priscilla Masamba
- Molecular Biophysics and Structural Biology (MBSB) Group, Department of Biochemistry, Faculty of Science, University of Johannesburg, Auckland Park Kingsway CampusAuckland Park, Johannesburg, South Africa
| | - Bamidele Abiodun Iwalokun
- Department of Molecular Biology and Biotechnology, Nigerian Institute of Medical Research (NIMR)Yaba, Lagos, Nigeria
| | - Abidemi Paul Kappo
- Molecular Biophysics and Structural Biology (MBSB) Group, Department of Biochemistry, Faculty of Science, University of Johannesburg, Auckland Park Kingsway CampusAuckland Park, Johannesburg, South Africa
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Boccarelli A, Del Buono N, Esposito F. Cluster of resistance-inducing genes in MCF-7 cells by estrogen, insulin, methotrexate and tamoxifen extracted via NMF. Pathol Res Pract 2023; 242:154347. [PMID: 36738509 DOI: 10.1016/j.prp.2023.154347] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 01/25/2023] [Accepted: 01/27/2023] [Indexed: 02/03/2023]
Abstract
Breast cancer has become a leading cause of death for women as the economy has grown and the number of women in the labor force has increased. Several biomarkers with diagnostic, prognostic, and therapeutic implications for breast cancer have been identified in studies, leading to therapeutic advances. Resistance, on the other hand, is one of clinical practice's limitations. In this paper, we use Nonnegative Matrix Factorization to automatically extract two gene signatures from gene expression profiles of wild-type and resistance MCF-7 cells, which were then investigated further using pathways analysis and proved useful in relating resistance pathways to breast cancer regardless of the stimulus that caused it. A few extracted genes (including MAOA, IL4I1, RRM2, DUT, NME4, and SUMO3) represent new elements in the functional network for resistance in MCF-7 ER+ breast cancer. As a result of this research, a better understanding of how resistance occurs or the pathways that contribute to it may allow more effective therapies to be developed.
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Affiliation(s)
- Angelina Boccarelli
- Department of Precision and Regenerative Medicine and Polo Jonico, University of Bari Medical School, Piazza Giulio Cesare 11, Bari, Italy.
| | - Nicoletta Del Buono
- Department of Mathematics, University of Bari Aldo Moro, via Edoardo Orabona 4, 70125 Bari, Italy; INDAM-GNCS Research Group, Piazzale Aldo Moro, 5, 00185 Roma, Italy.
| | - Flavia Esposito
- Department of Mathematics, University of Bari Aldo Moro, via Edoardo Orabona 4, 70125 Bari, Italy; INDAM-GNCS Research Group, Piazzale Aldo Moro, 5, 00185 Roma, Italy.
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Zakaria S, Elsebaey S, Allam S, Abdo W, El-Sisi A. Siah2 inhibitor and the metabolic antagonist Oxamate retard colon cancer progression and downregulate PD1 expression. Recent Pat Anticancer Drug Discov 2023; 19:PRA-EPUB-128869. [PMID: 36650629 DOI: 10.2174/1574892818666230116142606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 10/31/2022] [Accepted: 11/11/2022] [Indexed: 01/19/2023]
Abstract
BACKGROUND Solid tumors such as colon cancer are characterized by rapid and sustained cell proliferation, which ultimately results in hypoxia, induction of hypoxia-inducible factor-1α (HIF-1α), and activation of glycolysis to promote tumor survival and immune evasion. We hypothesized that a combinatorial approach of menadione (MEN) as an indirect HIF-1α inhibitor and sodium oxamate (OX) as a glycolysis inhibitor may be a promising treatment strategy for colon cancer. OBJECTIVES We investigated the potential efficacy of this combination for promoting an antitumor immune response and suppressing tumor growth in a rat model of colon cancer. METHODS Colon cancer was induced by once-weekly subcutaneous injection of 20 mg/kg dimethylhydrazine (DMH) for 16 weeks. Control rats received the vehicle and then no further treatment (negative control) or MEN plus OX for 4 weeks (drug control). Dimethylhydrazine-treated rats were then randomly allocated to four groups: DMH alone group and other groups treated with MEN, OX, and a combination of (MEN and OX) for 4 weeks. Serum samples were assayed for the tumor marker carbohydrate antigen (CA19.9), while expression levels of HIF-1α, caspase-3, PHD3, LDH, and PD1 were evaluated in colon tissue samples by immunoassay and qRT-PCR. Additionally, Ki-67 and Siah2 expression levels were examined by immunohistochemistry. RESULTS The combination of MEN plus OX demonstrated a greater inhibitory effect on the expression levels of HIF-1α, Siah2, LDH, Ki-67, and PD1, and greater enhancement of caspase-3 and PHD3 expression in colon cancer tissues than either drug alone. CONCLUSION Simultaneous targeting of hypoxia and glycolysis pathways by a combination of MEN and OX could be a promising therapy for inhibiting colon cancer cell growth and promoting antitumor immunity [1].
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Affiliation(s)
- Sherin Zakaria
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Kaferelsheikh University, 33516, Kaferelsheikh, Egypt
| | - Samar Elsebaey
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Kaferelsheikh University, 33516, Kaferelsheikh, Egypt
| | - Shady Allam
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Menoufia University, 32511, Menoufia, Egypt
| | - Walied Abdo
- Department of Pathology, Faculty of Veterinary Medicine, Kafrelsheikh University, 33516 Kaferelsheikh, Egypt
| | - Alaa El-Sisi
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Tanta University, 31512, Tanta, Egypt
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Wang Y, Liu X, Huang W, Liang J, Chen Y. The intricate interplay between HIFs, ROS, and the ubiquitin system in the tumor hypoxic microenvironment. Pharmacol Ther 2022; 240:108303. [PMID: 36328089 DOI: 10.1016/j.pharmthera.2022.108303] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 10/16/2022] [Accepted: 10/26/2022] [Indexed: 11/09/2022]
Abstract
Alterations in protein ubiquitination and hypoxia-inducible factor (HIF) signaling both contribute to tumorigenesis and tumor progression. Ubiquitination is a dynamic process that is coordinately regulated by E3 ligases and deubiquitinases (DUBs), which have emerged as attractive therapeutic targets. HIF expression and transcriptional activity are usually increased in tumors, leading to poor clinical outcomes. Reactive oxygen species (ROS) are upregulated in tumors and have multiple effects on HIF signaling and the ubiquitin system. A growing body of evidence has shown that multiple E3 ligases and UBDs function synergistically to control the expression and activity of HIF, thereby allowing cancer cells to cope with the hypoxic microenvironment. Conversely, several E3 ligases and DUBs are regulated by hypoxia and/or HIF signaling. Hypoxia also induces ROS production, which in turn modulates the stability or activity of HIF, E3 ligases, and DUBs. Understanding the complex networks between E3 ligase, DUBs, ROS, and HIF will provide insights into the fundamental mechanism of the cellular response to hypoxia and help identify novel molecular targets for cancer treatment. We review the current knowledge on the comprehensive relationship between E3 ligase, DUBs, ROS, and HIF signaling, with a particular focus on the use of E3 ligase or DUB inhibitors in cancer.
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Affiliation(s)
- Yijie Wang
- Institute of Biomedical Sciences, Shandong Provincial Key Laboratory of Animal Resistance Biology, Collaborative Innovation Center of Cell Biology in Universities of Shandong, Center for Cell Structure and Function, College of Life Sciences, Shandong Normal University, Jinan, Shandong 250014, China
| | - Xiong Liu
- School of Medicine, Jinan University, Guangzhou, Guangdong 510632, China
| | - Weixiao Huang
- School of Medicine, Jinan University, Guangzhou, Guangdong 510632, China
| | - Junjie Liang
- The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510630, China.
| | - Yan Chen
- Institute of Biomedical Sciences, Shandong Provincial Key Laboratory of Animal Resistance Biology, Collaborative Innovation Center of Cell Biology in Universities of Shandong, Center for Cell Structure and Function, College of Life Sciences, Shandong Normal University, Jinan, Shandong 250014, China; School of Medicine, Jinan University, Guangzhou, Guangdong 510632, China.
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10
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Siah1 promotes the proliferation of NSCLC cells through ubiquitinating and stabilizing Notch1. Exp Cell Res 2022; 419:113305. [PMID: 35961388 DOI: 10.1016/j.yexcr.2022.113305] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 07/23/2022] [Accepted: 08/03/2022] [Indexed: 11/21/2022]
Abstract
Seven in absentia homolog 1 (Siah1) has been shown plays important roles in the pathogenesis and development of multiple cancers. However, the functions and mechanisms of Siah1 in non-small cell lung cancer (NSCLC) remain unclear. In our study, we found that knock down of Siah1 could inhibit the proliferation of NSCLC cells, while over-expression of Siah1 had the opposite effects. Molecularly, the bioinformatics analysis determined that notch receptor 1 (Notch1) might be the potential target of Siah1. Subsequently, we identified that Siah1 acted as an E3 ligase to promote the ubiquitination and stabilization of Notch1 through the proteasome pathway. Furthermore, the results showed that the Siah1 expression was directly correlated with CTR9 in human NSCLC tissues. Finally, Siah1 could promote Akt phosphorylation through regulating Notch1, thus promoting the proliferation of NSCLC cells. In conclusion, our study demonstrated that Siah1 acts as an oncogene, can ubiquitinate and stabilize Notch1 by proteasome pathway, which promotes Akt phosphorylation and ultimately leads to NSCLC cell proliferation.
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Modulating the Siah2-PHD3-HIF1α axis and/or autophagy potentially retard colon cancer proliferation possibly, due to the damping of colon cancer stem cells. Biomed Pharmacother 2022; 154:113562. [PMID: 35994813 DOI: 10.1016/j.biopha.2022.113562] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 08/11/2022] [Accepted: 08/14/2022] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Hypoxic microenvironment of colon cancer is associated with HIF-1α upregulation. HIF-1α response elements are responsible for autophagy induction that promotes tumor proliferation. Moreover, HIF-1α induces tumor cell proliferation via maintaining cancer stem cells (CSCs) survival. Siah2 is E3 ubiquitin ligase that indirectly stabilizes HIF-1α. We hypothesized that dual inhibition of Siah2 as well as autophagy could be a promising approach that may inhibit CSCs growth. AIM OF THE WORK This study investigated the possible effect of vitamin K3 as a Siah2 inhibitor and hydroxychloroquine as an autophagy inhibitor in colon cancer management. The effect (if any) of these agents on CSCs growth will be also manipulated. METHODS Colon cancer was induced by dimethylhydrazine. MDA and GSH were selected as oxidative stress markers, Expression of HIF-1α, Caspase-3, VEGF, MMP-9, EpCAM, SCF, and CA19.9 were assayed using immunoassay. The Western blot technique was used to assess LC3Ⅰ, CD44, and CD133 whereas RT-PCR was used to investigate PHD3 and CD44 in colon tissues. Additionally, Ki-67 and Siah2 were detected immunohistochemically. RESULTS vitamin K3 and hydroxychloroquine either alone or in combination downregulated the expression of Siah2 and HIF-1α through upregulating PHD3 in colon tissues. This combination significantly downregulated MDA, Ki-67, VEGF, and MMP-9 expression and upregulated the expression of GSH and caspase-3. LC3Ⅰ was also upregulated. Interestingly, these therapeutic options were correlated with down-regulation of the cancer stem cell marker such as CD44 and EpCAM. CONCLUSION Our results suggested that suppression of both Siah2-PHD3-HIF-1α axis and autophagy retard colon cancer proliferation and dampened CSCs.
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Dang TN, Tiongco RP, Brown LM, Taylor JL, Lyons JM, Lau FH, Floyd ZE. Expression of the preadipocyte marker ZFP423 is dysregulated between well-differentiated and dedifferentiated liposarcoma. BMC Cancer 2022; 22:300. [PMID: 35313831 PMCID: PMC8939188 DOI: 10.1186/s12885-022-09379-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 03/04/2022] [Indexed: 11/19/2022] Open
Abstract
Background Well-differentiated and dedifferentiated liposarcomas are rare soft tissue tumors originating in adipose tissue that share genetic abnormalities but have significantly different metastatic potential. Dedifferentiated liposarcoma (DDLPS) is highly aggressive and has an overall 5-year survival rate of 30% as compared to 90% for well-differentiated liposarcoma (WDLPS). This discrepancy may be connected to their potential to form adipocytes, where WDLPS is adipogenic but DDLPS is adipogenic-impaired. Normal adipogenesis requires Zinc Finger Protein 423 (ZFP423), a transcriptional coregulator of Perixosome Proliferator Activated Receptor gamma (PPARG2) mRNA expression that defines committed preadipocytes. Expression of ZFP423 in preadipocytes is promoted by Seven-In-Absentia Homolog 2 (SIAH2)-mediated degradation of Zinc Finger Protein 521 (ZFP521). This study investigated the potential role of ZFP423, SIAH2 and ZFP521 in the adipogenic potential of WDLPS and DDLPS. Methods Human WDLPS and DDLPS fresh and paraffin-embedded tissues were used to assess the gene and protein expression of proadipogenic regulators. In parallel, normal adipose tissue stromal cells along with WDLPS and DDLPS cell lines were cultured, genetically modified, and induced to undergo adipogenesis in vitro. Results Impaired adipogenic potential in DDLPS was associated with reduced ZFP423 protein levels in parallel with reduced PPARG2 expression, potentially involving regulation of ZFP521. SIAH2 protein levels did not define a clear distinction related to adipogenesis in these liposarcomas. However, in primary tumor specimens, SIAH2 mRNA was consistently upregulated in DDLPS compared to WDLPS when assayed by fluorescence in situ hybridization or real-time PCR. Conclusions These data provide novel insights into ZFP423 expression in adipogenic regulation between WDLPS and DDLPS adipocytic tumor development. The data also introduces SIAH2 mRNA levels as a possible molecular marker to distinguish between WDLPS and DDLPS. Supplementary Information The online version contains supplementary material available at 10.1186/s12885-022-09379-6.
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Affiliation(s)
- Thanh N Dang
- Pennington Biomedical Research Center, Baton Rouge, Louisiana, 70808, USA
| | - Rafael P Tiongco
- Tulane University School of Medicine, New Orleans, Louisiana, 70118, USA
| | - Loren M Brown
- Department of Surgery, Louisiana State University Health Science Center, New Orleans, Louisiana, 70112, USA
| | - Jessica L Taylor
- Pennington Biomedical Research Center, Baton Rouge, Louisiana, 70808, USA
| | - John M Lyons
- Our Lady of the Lake Medical Center, Baton Rouge, Louisiana, 70808, USA
| | - Frank H Lau
- Department of Surgery, Louisiana State University Health Science Center, New Orleans, Louisiana, 70112, USA.
| | - Z Elizabeth Floyd
- Pennington Biomedical Research Center, Baton Rouge, Louisiana, 70808, USA.
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13
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Lin L, Gao W, Chen Y, Li T, Sha C, Chen L, Yang M, Wei H, Chen Y, Zhu X. Reactive oxygen species-induced SIAH1 promotes granulosa cells' senescence in premature ovarian failure. J Cell Mol Med 2022; 26:2417-2427. [PMID: 35261172 PMCID: PMC8995443 DOI: 10.1111/jcmm.17264] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 02/12/2022] [Accepted: 02/23/2022] [Indexed: 12/29/2022] Open
Abstract
Reactive oxygen species (ROS) exposure triggers granulosa cells' (GCs) senescence, which is an important causal factor for premature ovarian failure (POF). However, underlying mechanism in this process remains unknown. In our study, we observed increased ROS levels in POF ovarian tissues, POF patient follicular GCs and cyclophosphamide (CTX) pretreated GCs. Correspondingly, increased SIAH1, reduced TRF2 and GC senescence were also found in these cases. Silencing of SIAH1 rescued ROS‐induced TRF2 reduction and cell senescence in GCs. Moreover, SIAH1 co‐localized with TRF2 in the cytoplasm, facilitating its ubiquitination degradation, further leading to telomere abnormalities in GCs. In conclusion, our findings indicate that ROS induces telomere abnormalities by augmenting SIAH1‐mediated TRF2 degradation, leading to cell senescence in GCs in POF processing.
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Affiliation(s)
- Li Lin
- Reproductive Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China.,Department of Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Wujiang Gao
- Reproductive Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China.,Department of Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Yumei Chen
- Department of Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Taoqiong Li
- Reproductive Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China.,Department of Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Chunli Sha
- Reproductive Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China.,Department of Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Lu Chen
- Reproductive Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China.,Department of Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Meiling Yang
- Department of Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Hong Wei
- Department of Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Yunpeng Chen
- Department of Radiology, The Affiliated Hospital of Jiangsu University, Zhenjiang, China
| | - Xiaolan Zhu
- Reproductive Center, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China.,Department of Central Laboratory, The Fourth Affiliated Hospital of Jiangsu University, Zhenjiang, China.,International Genome Center of Jiangsu University, Zhenjiang, China
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14
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Li K, Li J, Ye M, Jin X. The role of Siah2 in tumorigenesis and cancer therapy. Gene 2022; 809:146028. [PMID: 34687788 DOI: 10.1016/j.gene.2021.146028] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 10/11/2021] [Accepted: 10/14/2021] [Indexed: 12/12/2022]
Abstract
Seven in absentia homolog 2 (Siah2), an RING E3 ubiquitin ligases, has been characterized to play the vital role in tumorigenesis and cancer progression. Numerous studies have determined that Siah2 promotes tumorigenesis in a variety of human malignancies such as prostate, lung, gastric, and liver cancers. However, several studies revealed that Siah2 exhibited tumor suppressor function by promoting the proteasome-mediated degradation of several oncoproteins, suggesting that Siah2 could exert its biological function according to different stages of tumor development. Moreover, Siah2 is subject to complex regulation, especially the phosphorylation of Siah2 by a variety of protein kinases to regulate its stability and activity. In this review, we describe the structure and regulation of Siah2 in human cancer. Moreover, we highlight the critical role of Siah2 in tumorigenesis. Furthermore, we note that the potential clinical applications of targeting Siah2 in cancer therapy.
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Affiliation(s)
- Kailang Li
- The Affiliated Hospital of Medical School, Ningbo University, Ningbo 315020, China; Department of Biochemistry and Molecular Biology, Zhejiang Key Laboratory of Pathphysiology, Medical School of Ningbo University, Ningbo 315211, China
| | - Jinyun Li
- The Affiliated Hospital of Medical School, Ningbo University, Ningbo 315020, China; Department of Biochemistry and Molecular Biology, Zhejiang Key Laboratory of Pathphysiology, Medical School of Ningbo University, Ningbo 315211, China
| | - Meng Ye
- The Affiliated Hospital of Medical School, Ningbo University, Ningbo 315020, China; Department of Biochemistry and Molecular Biology, Zhejiang Key Laboratory of Pathphysiology, Medical School of Ningbo University, Ningbo 315211, China.
| | - Xiaofeng Jin
- The Affiliated Hospital of Medical School, Ningbo University, Ningbo 315020, China; Department of Biochemistry and Molecular Biology, Zhejiang Key Laboratory of Pathphysiology, Medical School of Ningbo University, Ningbo 315211, China.
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15
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Wang Y, Dai J, Zeng Y, Guo J, Lan J. E3 Ubiquitin Ligases in Breast Cancer Metastasis: A Systematic Review of Pathogenic Functions and Clinical Implications. Front Oncol 2021; 11:752604. [PMID: 34745984 PMCID: PMC8569917 DOI: 10.3389/fonc.2021.752604] [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: 08/03/2021] [Accepted: 10/04/2021] [Indexed: 02/05/2023] Open
Abstract
Female breast cancer has become the most commonly occurring cancer worldwide. Although it has a good prognosis under early diagnosis and appropriate treatment, breast cancer metastasis drastically causes mortality. The process of metastasis, which includes cell epithelial–mesenchymal transition, invasion, migration, and colonization, is a multistep cascade of molecular events directed by gene mutations and altered protein expressions. Ubiquitin modification of proteins plays a common role in most of the biological processes. E3 ubiquitin ligase, the key regulator of protein ubiquitination, determines the fate of ubiquitinated proteins. E3 ubiquitin ligases target a broad spectrum of substrates. The aberrant functions of many E3 ubiquitin ligases can affect the biological behavior of cancer cells, including breast cancer metastasis. In this review, we provide an overview of these ligases, summarize the metastatic processes in which E3s are involved, and comprehensively describe the roles of E3 ubiquitin ligases. Furthermore, we classified E3 ubiquitin ligases based on their structure and analyzed them with the survival of breast cancer patients. Finally, we consider how our knowledge can be used for E3s’ potency in the therapeutic intervention or prognostic assessment of metastatic breast cancer.
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Affiliation(s)
- Yingshuang Wang
- Key Laboratory of Systematic Research of Distinctive Chinese Medicine Resources in Southwest China, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Chongqing Key Laboratory of Sichuan-Chongqing Co-construction for Diagnosis and Treatment of Infectious Diseases Integrated Traditional Chinese and Western Medicine, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Jiawen Dai
- Key Laboratory of Systematic Research of Distinctive Chinese Medicine Resources in Southwest China, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Chongqing Key Laboratory of Sichuan-Chongqing Co-construction for Diagnosis and Treatment of Infectious Diseases Integrated Traditional Chinese and Western Medicine, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Youqin Zeng
- Key Laboratory of Systematic Research of Distinctive Chinese Medicine Resources in Southwest China, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Chongqing Key Laboratory of Sichuan-Chongqing Co-construction for Diagnosis and Treatment of Infectious Diseases Integrated Traditional Chinese and Western Medicine, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Jinlin Guo
- Key Laboratory of Systematic Research of Distinctive Chinese Medicine Resources in Southwest China, Chengdu University of Traditional Chinese Medicine, Chengdu, China.,Chongqing Key Laboratory of Sichuan-Chongqing Co-construction for Diagnosis and Treatment of Infectious Diseases Integrated Traditional Chinese and Western Medicine, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Jie Lan
- Department of Thoracic Oncology, Department of Radiation Oncology, Cancer Center and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
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16
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Chu C, Zhang W, Kang Y, Si C, Ji W, Niu Y, Zhang Y. Analysis of developmental imprinting dynamics in primates using SNP-free methods to identify imprinting defects in cloned placenta. Dev Cell 2021; 56:2826-2840.e7. [PMID: 34619096 DOI: 10.1016/j.devcel.2021.09.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Revised: 08/25/2021] [Accepted: 09/10/2021] [Indexed: 12/30/2022]
Abstract
Our knowledge of genomic imprinting in primates is lagging behind that of mice largely because of the difficulties of allelic analyses in outbred animals. To understand imprinting dynamics in primates, we profiled transcriptomes, DNA methylomes, and H3K27me3 in uniparental monkey embryos. We further developed single-nucleotide-polymorphism (SNP)-free methods, TARSII and CARSII, to identify germline differentially methylated regions (DMRs) in somatic tissues. Our comprehensive analyses showed that allelic DNA methylation, but not H3K27me3, is a major mark that correlates with paternal-biasedly expressed genes (PEGs) in uniparental monkey embryos. Interestingly, primate germline DMRs are different from PEG-associated DMRs in early embryos and are enriched in placenta. Strikingly, most placenta-specific germline DMRs are lost in placenta of cloned monkeys. Collectively, our study establishes SNP-free germline DMR identification methods, defines developmental imprinting dynamics in primates, and demonstrates imprinting defects in cloned monkey placenta, which provides important clues for improving primate cloning.
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Affiliation(s)
- Chu Chu
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; Yunnan Key Laboratory of Primate Biomedical Research, Kunming, Yunnan 650500, China; Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
| | - Wenhao Zhang
- Howard Hughes Medical Institute, Boston Children's Hospital, Boston, MA 02115, USA; Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA 02115, USA; Division of Hematology/Oncology, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA.
| | - Yu Kang
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; Yunnan Key Laboratory of Primate Biomedical Research, Kunming, Yunnan 650500, China; Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
| | - Chenyang Si
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; Yunnan Key Laboratory of Primate Biomedical Research, Kunming, Yunnan 650500, China; Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
| | - Weizhi Ji
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; Yunnan Key Laboratory of Primate Biomedical Research, Kunming, Yunnan 650500, China.
| | - Yuyu Niu
- State Key Laboratory of Primate Biomedical Research, Institute of Primate Translational Medicine, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; Yunnan Key Laboratory of Primate Biomedical Research, Kunming, Yunnan 650500, China; Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, Yunnan 650500, China.
| | - Yi Zhang
- Howard Hughes Medical Institute, Boston Children's Hospital, Boston, MA 02115, USA; Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA 02115, USA; Division of Hematology/Oncology, Department of Pediatrics, Boston Children's Hospital, Boston, MA 02115, USA; Department of Genetics, Harvard Medical School, Boston, MA 02115, USA; Harvard Stem Cell Institute, WAB-149G, 200 Longwood Avenue, Boston, MA 02115, USA.
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17
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Dixit P, Kokate SB, Poirah I, Chakraborty D, Smoot DT, Ashktorab H, Rout N, Singh SP, Bhattacharyya A. Helicobacter pylori-induced gastric cancer is orchestrated by MRCKβ-mediated Siah2 phosphorylation. J Biomed Sci 2021; 28:12. [PMID: 33536006 PMCID: PMC7856738 DOI: 10.1186/s12929-021-00710-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 01/22/2021] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Helicobacter pylori-mediated gastric carcinogenesis is initiated by a plethora of signaling events in the infected gastric epithelial cells (GECs). The E3 ubiquitin ligase seven in absentia homolog 2 (Siah2) is induced in GECs in response to H. pylori infection. Posttranslational modifications of Siah2 orchestrate its function as well as stability. The aim of this study was to evaluate Siah2 phosphorylation status under the influence of H. pylori infection and its impact in gastric cancer progression. METHODS H. pylori-infected various GECs, gastric tissues from H. pylori-infected GC patients and H. felis-infected C57BL/6 mice were evaluated for Siah2 phosphorylation by western blotting or immunofluorescence microscopy. Coimmunoprecipitation assay followed by mass spectrometry were performed to identify the kinases interacting with Siah2. Phosphorylation sites of Siah2 were identified by using various plasmid constructs generated by site-directed mutagenesis. Proteasome inhibitor MG132 was used to investigate proteasome degradation events. The importance of Siah2 phosphorylation on tumorigenicity of infected cells were detected by using phosphorylation-null mutant and wild type Siah2 stably-transfected cells followed by clonogenicity assay, cell proliferation assay, anchorage-independent growth and transwell invasion assay. RESULTS Siah2 was phosphorylated in H. pylori-infected GECs as well as in metastatic GC tissues at residues serine6 (Ser6) and threonine279 (Thr279). Phosphorylation of Siah2 was mediated by MRCKβ, a Ser/Thr protein kinase. MRCKβ was consistently expressed in uninfected GECs and noncancer gastric tissues but its level decreased in infected GECs as well as in metastatic tissues which had enhanced Siah2 expression. Infected murine gastric tissues showed similar results. MRCKβ could phosphorylate Siah2 but itself got ubiquitinated from this interaction leading to the proteasomal degradation of MRCKβ and use of proteasomal inhibitor MG132 could rescue MRCKβ from Siah2-mediated degradation. Ser6 and Thr279 phosphorylated-Siah2 was more stable and tumorigenic than its non-phosphorylated counterpart as revealed by the proliferation, invasion, migration abilities and anchorage-independent growth of stable-transfected cells. CONCLUSIONS Increased level of Ser6 and Thr279-phosphorylated-Siah2 and downregulated MRCKβ were prominent histological characteristics of Helicobacter-infected gastric epithelium and metastatic human GC. MRCKβ-dependent Siah2 phosphorylation stabilized Siah2 which promoted anchorage-independent survival and proliferative potential of GECs. Phospho-null mutants of Siah2 (S6A and T279A) showed abated tumorigenicity.
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Affiliation(s)
- Pragyesh Dixit
- grid.419643.d0000 0004 1764 227XSchool of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI, P.O. Bhimpur-Padanpur, Via Jatni, Khurda, 752050 Odisha India
| | - Shrikant B. Kokate
- grid.419643.d0000 0004 1764 227XSchool of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI, P.O. Bhimpur-Padanpur, Via Jatni, Khurda, 752050 Odisha India ,grid.7737.40000 0004 0410 2071Present Address: Institute of Biotechnology, University of Helsinki, P.O. Box 56, 0014 Helsinki, Finland
| | - Indrajit Poirah
- grid.419643.d0000 0004 1764 227XSchool of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI, P.O. Bhimpur-Padanpur, Via Jatni, Khurda, 752050 Odisha India
| | - Debashish Chakraborty
- grid.419643.d0000 0004 1764 227XSchool of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI, P.O. Bhimpur-Padanpur, Via Jatni, Khurda, 752050 Odisha India
| | - Duane T. Smoot
- Department of Medicine, Meharry Medical Center, Nashville, TN 37208 USA
| | - Hassan Ashktorab
- grid.257127.40000 0001 0547 4545Department of Medicine, Howard University, Washington, DC 20060 USA
| | - Niranjan Rout
- Department of Pathology, Acharya Harihar Post Graduate Institute of Cancer, Cuttack, 753007 Odisha India
| | - Shivaram P. Singh
- grid.415328.90000 0004 1767 2428Department of Gastroenterology, SCB Medical College, Cuttack, 753007 Odisha India
| | - Asima Bhattacharyya
- School of Biological Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, HBNI, P.O. Bhimpur-Padanpur, Via Jatni, Khurda, 752050, Odisha, India.
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18
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Potentials of miR-15/16 targeting cancer stem cell pathways: Novel implication in cancer chemotherapy. GENE REPORTS 2020. [DOI: 10.1016/j.genrep.2020.100755] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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19
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Wu Z, Tang H, Xiong Q, Liu D, Xia T, Liang H, Ye Q. Prognostic Role of microRNA-205 in Human Gynecological Cancer: A Meta-Analysis of Fourteen Studies. DNA Cell Biol 2020; 39:875-889. [PMID: 32354230 DOI: 10.1089/dna.2019.5316] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Several studies have revealed that miR-205 plays important roles in the development of gynecological cancers and thus may serve as a potential prognostic biomarker, but the current conclusions remain controversial. Therefore, the goal of this study was to explore the prognostic significance and functional mechanisms of miR-205 based on a meta-analysis and bioinformatics investigation. A total of 14 published studies containing 5835 patients were enrolled by searching the PubMed, EMBASE, and Cochrane library databases, 13 (14 datasets) and 5 (6 datasets) of which evaluated the correlations between the expression level of miR-205 and overall survival (OS) or disease-free survival (DFS)/disease-specific survival (DSS)/progression-free survival (PFS)/distant metastasis-free survival (DMFS), respectively. Furthermore, the use of online Kaplan-Meier plotter database analysis supplemented another seven results for OS. Then, a meta-analysis using these 21 and 6 datasets was performed. As a result, the overall analysis failed to demonstrate any significant associations between miR-205 expression and OS (p = 0.267) or DSS/DFS/DMFS/PFS (p = 0.457), but the subgroup analysis suggested that elevated miR-205 predicted a reduced OS for breast cancer (BC) patients (hazard ratio [HR] = 0.84, 95% confidence interval [CI] = 0.72-0.98; p = 0.022), while higher miR-205 was associated with a poor DSS for endometrial cancer (EC) patients (HR = 2.19, 95% CI = 1.45-3.32; p < 0.001). Function prediction analysis indicated that miR-205 may be involved in BC by negatively influencing hub genes, SMARCA5 and SIAH1, whereas miR-205 may participate in EC by negatively modulating BMPR1B because of the presence of interactions of miR-205 with them at 3'-untranslated region and their opposite prognosis outcomes with miR-205. In conclusion, our findings suggest miR-205 may be a promising prognostic biomarker and therapeutic target for BC and EC patients.
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Affiliation(s)
- Zhixi Wu
- Department of Obstetrics and Gynecology, Dongguan People's Hospital (Affiliated Dongguan Hospital, South Medical University), Dongguan, China
| | - Hong Tang
- Department of Gynecology, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Qian Xiong
- Department of Gynecology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Dong Liu
- Department of Gynecology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Tingting Xia
- Center for Reproductive Medicine, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Huichao Liang
- Department of Obstetrics and Gynecology, Guangzhou Eighth People's Hospital, Guangzhou Medical University, Guangzhou, China
| | - Qingjian Ye
- Department of Gynecology, The Third Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
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20
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Xiao Z, Wei Z, Deng D, Zheng Z, Zhao Y, Jiang S, Zhang D, Zhang LJ, Fan M, Chen S, Wang S, Ding Y, Ye Y, Jiao H. Downregulation of Siah1 promotes colorectal cancer cell proliferation and migration by regulating AKT and YAP ubiquitylation and proteasome degradation. Cancer Cell Int 2020; 20:50. [PMID: 32082080 PMCID: PMC7020597 DOI: 10.1186/s12935-020-1124-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Accepted: 01/25/2020] [Indexed: 12/11/2022] Open
Abstract
Background Colorectal cancer (CRC) is one of the most common malignant tumors in the world. Siah E3 ubiquitin protein ligase 1 (Siah1) has been identified as a tumor suppressor gene and plays an important role in the development of malignant tumors. However, the potential role and molecular mechanism of Siah1 in the development and progression of CRC is still unclear. Methods To explore the role and molecular mechanism of Siah1 in the development and progression of CRC, we examined the expression of Siah1 in CRC tissue samples and analyzed its association with progression and prognosis in CRC. In addition, overexpression and knockdown of Siah1 was used to investigate its activity in CRC cells. We also use bioinformatics to analyze and verify the significant roles of Siah1 in critical signaling pathways of CRC. Results We found that the expression of Siah1 was significantly downregulated in CRC tissues, and low expression of Siah1 was associated with aggressive TNM staging and poor survival of CRC patients. Moreover, we revealed that overexpression of Siah1 in CRC cells markedly inhibited CRC cell proliferation and invasion in vitro and in vivo, while knockdown of Siah1 enhanced CRC cell proliferation and invasion. Furthermore, we found that Siah1 prohibited cell proliferation and invasion in CRC partially through promoting AKT (the serine-threonine protein kinase) and YAP (yes associated protein) ubiquitylation and proteasome degradation to regulate the activity of MAPK(mitogen-activated protein kinase 1), PI3K-AKT (phosphatidylinositol 3-kinase-the serine-threonine protein kinase) and Hippo signaling pathways. Conclusions These findings suggested that Siah1 is a novel potential prognostic biomarker and plays a tumor suppressor role in the development and progression of CRC.
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Affiliation(s)
- Zhiyuan Xiao
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China.,3Department of Pathology, Shenzhen People's Hospital, Second Clinical Medical College of Jinan University, Shenzhen, Guangdong China
| | - Zhigang Wei
- 4Department of General Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Danling Deng
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China.,Department of Pathology, Shaoyang Central Hospital, Affiliated Shaoyang Hospital of University of South China, Shaoyang, Hunan China
| | - Zhe Zheng
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China
| | - Yali Zhao
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China
| | - Shenglu Jiang
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China
| | - Dan Zhang
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China
| | - Ling-Jie Zhang
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China
| | - Mingmei Fan
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China
| | - Siqi Chen
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China
| | - ShuYang Wang
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China
| | - Yanqing Ding
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China
| | - Yaping Ye
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China
| | - Hongli Jiao
- 1Department of Pathology, Nanfang Hospital and School of Basic Medical Science, Southern Medical University, Guangzhou, 510515 China.,2Guangdong Provincial Key Laboratory of Molecular Tumor Pathology, Guangzhou, China
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21
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Kim K, Sun H. Incorporating genetic networks into case-control association studies with high-dimensional DNA methylation data. BMC Bioinformatics 2019; 20:510. [PMID: 31640538 PMCID: PMC6805595 DOI: 10.1186/s12859-019-3040-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Accepted: 08/21/2019] [Indexed: 12/23/2022] Open
Abstract
Background In human genetic association studies with high-dimensional gene expression data, it has been well known that statistical selection methods utilizing prior biological network knowledge such as genetic pathways and signaling pathways can outperform other methods that ignore genetic network structures in terms of true positive selection. In recent epigenetic research on case-control association studies, relatively many statistical methods have been proposed to identify cancer-related CpG sites and their corresponding genes from high-dimensional DNA methylation array data. However, most of existing methods are not designed to utilize genetic network information although methylation levels between linked genes in the genetic networks tend to be highly correlated with each other. Results We propose new approach that combines data dimension reduction techniques with network-based regularization to identify outcome-related genes for analysis of high-dimensional DNA methylation data. In simulation studies, we demonstrated that the proposed approach overwhelms other statistical methods that do not utilize genetic network information in terms of true positive selection. We also applied it to the 450K DNA methylation array data of the four breast invasive carcinoma cancer subtypes from The Cancer Genome Atlas (TCGA) project. Conclusions The proposed variable selection approach can utilize prior biological network information for analysis of high-dimensional DNA methylation array data. It first captures gene level signals from multiple CpG sites using data a dimension reduction technique and then performs network-based regularization based on biological network graph information. It can select potentially cancer-related genes and genetic pathways that were missed by the existing methods. Electronic supplementary material The online version of this article (10.1186/s12859-019-3040-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Kipoong Kim
- Department of Statistic, Pusan National University, Busan, 46241, Korea
| | - Hokeun Sun
- Department of Statistic, Pusan National University, Busan, 46241, Korea.
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22
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Miyamoto K, Nakatani A, Sunagawa M, Saito K. Unique auto-ubiquitination activities of artificial RING fingers in cancer cells. Protein Sci 2018; 27:1704-1709. [PMID: 30152188 PMCID: PMC6194272 DOI: 10.1002/pro.3452] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 06/06/2018] [Indexed: 12/27/2022]
Abstract
Ubiquitin-conjugating (E2) enzymes in protein ubiquitination are associated with various diseases. An artificial RING finger (ARF) is a useful tool, and E2 activities are conveniently estimated based on ARF reactivities. To extend the use of ARF in cells, we constructed a TAT-ARF using a cell-penetrating trans-activator protein (TAT) peptide. An in vitro ubiquitination assay without substrates showed auto-ubiquitination of TAT-ARF via its TAT region. TAT-ARF was translocated into MCF7 breast cancer cells, and then TAT-ARF ubiquitinated itself via its ARF. Experiments using confocal laser-scanning microscopy revealed that FAM-labeled TAT-ARF was readily internalized in cells and it remained encapsulated in vesicles. The Cell Counting Kit-8 assay indicated that the TAT-ARF uptake occurred without cytotoxicity in MCF7 cells at concentrations below 5.0 μM. By taking advantage of TAT-ARF, we, for the first time, succeeded in detecting E2 activities in cells. Thus, the present work opens up new avenues in the investigation of protein ubiquitination.
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Affiliation(s)
- Kazuhide Miyamoto
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical SciencesHimeji Dokkyo UniversityHyogoJapan
| | - Arisa Nakatani
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical SciencesHimeji Dokkyo UniversityHyogoJapan
| | - Mayumi Sunagawa
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical SciencesHimeji Dokkyo UniversityHyogoJapan
| | - Kazuki Saito
- Department of Pharmaceutical Health Care, Faculty of Pharmaceutical SciencesHimeji Dokkyo UniversityHyogoJapan
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23
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The functional interplay between the HIF pathway and the ubiquitin system - more than a one-way road. Exp Cell Res 2017; 356:152-159. [PMID: 28315321 DOI: 10.1016/j.yexcr.2017.03.027] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 03/13/2017] [Indexed: 12/30/2022]
Abstract
The hypoxia inducible factor (HIF) pathway and the ubiquitin system represent major cellular processes that are involved in the regulation of a plethora of cellular signaling pathways and tissue functions. The ubiquitin system controls the ubiquitination of proteins, which is the covalent linkage of one or several ubiquitin molecules to specific targets. This ubiquitination is catalyzed by approximately 1000 different E3 ubiquitin ligases and can lead to different effects, depending on the type of internal ubiquitin chain linkage. The best-studied function is the targeting of proteins for proteasomal degradation. The activity of E3 ligases is antagonized by proteins called deubiquitinases (or deubiquitinating enzymes), which negatively regulate ubiquitin chains. This is performed in most cases by the catalytic removal of these chains from the targeted protein. The HIF pathway is regulated in an oxygen-dependent manner by oxygen-sensing hydroxylases. Covalent modification of HIFα subunits leads to the recruitment of an E3 ligase complex via the von Hippel-Lindau (VHL) protein and the subsequent polyubiquitination and proteasomal degradation of HIFα subunits, demonstrating the regulation of the HIF pathway by the ubiquitin system. This unidirectional effect of an E3 ligase on the HIF pathway is the best-studied example for the interplay between these two important cellular processes. However, additional regulatory mechanisms of the HIF pathway through the ubiquitin system are emerging and, more recently, also the reciprocal regulation of the ubiquitin system through components of the HIF pathway. Understanding these mechanisms and their relevance for the activity of each other is of major importance for the comprehensive elucidation of the oxygen-dependent regulation of cellular processes. This review describes the current knowledge of the functional bidirectional interplay between the HIF pathway and the ubiquitin system on the protein level.
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Zhang Q, Wang Z, Hou F, Harding R, Huang X, Dong A, Walker JR, Tong Y. The substrate binding domains of human SIAH E3 ubiquitin ligases are now crystal clear. Biochim Biophys Acta Gen Subj 2016; 1861:3095-3105. [PMID: 27776223 DOI: 10.1016/j.bbagen.2016.10.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 10/03/2016] [Accepted: 10/19/2016] [Indexed: 10/20/2022]
Abstract
BACKGROUND Seven in absentia homologs (SIAHs) comprise a family of highly conserved E3 ubiquitin ligases that play an important role in regulating signalling pathways in tumorigenesis, including the DNA damage repair and hypoxia response pathways. SIAH1 and SIAH2 have been found to function as a tumour repressor and a proto-oncogene, respectively, despite the high sequence identity of their substrate binding domains (SBDs). Ubiquitin-specific protease USP19 is a deubiquitinase that forms a complex with SIAHs and counteracts the ligase function. Much effort has been made to find selective inhibitors of the SIAHs E3 ligases. Menadione was reported to inhibit SIAH2 specifically. METHODS We used X-ray crystallography, peptide array, bioinformatic analysis, and biophysical techniques to characterize the structure and interaction of SIAHs with deubiquitinases and literature reported compounds. RESULTS We solved the crystal structures of SIAH1 in complex with a USP19 peptide and of the apo form SIAH2. Phylogenetic analysis revealed the SIAH/USP19 complex is conserved in evolution. We demonstrated that menadione destabilizes both SIAH1 and SIAH2 non-specifically through covalent modification. CONCLUSIONS The SBDs of SIAH E3 ligases are structurally similar with a subtle stability difference. USP19 is the only deubiquitinase that directly binds to SIAHs through the substrate binding pocket. Menadione is not a specific inhibitor for SIAH2. GENERAL SIGNIFICANCE The crystallographic models provide structural insights into the substrate binding of the SIAH family E3 ubiquitin ligases that are critically involved in regulating cancer-related pathways. Our results suggest caution should be taken when using menadione as a specific SIAH2 inhibitor.
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Affiliation(s)
- Qi Zhang
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Zhongduo Wang
- Fisheries College, Guangdong Ocean University, Zhanjiang, Guangdong 524025, China
| | - Feng Hou
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Rachel Harding
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Xinyi Huang
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Aiping Dong
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - John R Walker
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Yufeng Tong
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada; Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario M5G 1L7, Canada.
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van Reesema LLS, Zheleva V, Winston JS, Jansen RJ, O'Connor CF, Isbell AJ, Bian M, Qin R, Bassett PT, Hinson VJ, Dorsch KA, Kirby BW, Van Sciver RE, Tang-Tan AM, Harden EA, Chang DZ, Allen CA, Perry RR, Hoefer RA, Tang AH. SIAH and EGFR, Two RAS Pathway Biomarkers, are Highly Prognostic in Locally Advanced and Metastatic Breast Cancer. EBioMedicine 2016; 11:183-198. [PMID: 27569656 PMCID: PMC5049993 DOI: 10.1016/j.ebiom.2016.08.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 08/03/2016] [Accepted: 08/10/2016] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Metastatic breast cancer exhibits diverse and rapidly evolving intra- and inter-tumor heterogeneity. Patients with similar clinical presentations often display distinct tumor responses to standard of care (SOC) therapies. Genome landscape studies indicate that EGFR/HER2/RAS "pathway" activation is highly prevalent in malignant breast cancers. The identification of therapy-responsive and prognostic biomarkers is paramount important to stratify patients and guide therapies in clinical oncology and personalized medicine. METHODS In this study, we analyzed matched pairs of tumor specimens collected from 182 patients who received neoadjuvant systemic therapies (NST). Statistical analyses were conducted to determine whether EGFR/HER2/RAS pathway biomarkers and clinicopathological predictors, alone and in combination, are prognostic in breast cancer. FINDINGS SIAH and EGFR outperform ER, PR, HER2 and Ki67 as two logical, sensitive and prognostic biomarkers in metastatic breast cancer. We found that increased SIAH and EGFR expression correlated with advanced pathological stage and aggressive molecular subtypes. Both SIAH expression post-NST and NST-induced changes in EGFR expression in invasive mammary tumors are associated with tumor regression and increased survival, whereas ER, PR, and HER2 were not. These results suggest that SIAH and EGFR are two prognostic biomarkers in breast cancer with lymph node metastases. INTERPRETATION The discovery of incorporating tumor heterogeneity-independent and growth-sensitive RAS pathway biomarkers, SIAH and EGFR, whose altered expression can be used to estimate therapeutic efficacy, detect emergence of resistant clones, forecast tumor regression, differentiate among partial responders, and predict patient survival in the neoadjuvant setting, has a clear clinical implication in personalizing breast cancer therapy. FUNDING This work was supported by the Dorothy G. Hoefer Foundation for Breast Cancer Research (A.H. Tang); Center for Innovative Technology (CIT)-Commonwealth Research Commercialization Fund (CRCF) (MF14S-009-LS to A.H. Tang), and National Cancer Institute (CA140550 to A.H. Tang).
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Affiliation(s)
- Lauren L Siewertsz van Reesema
- Department of Microbiology and Molecular Cell Biology, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Vasilena Zheleva
- Department of Surgery, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Janet S Winston
- Sentara Pathology and Pathology Sciences Medical Group, Department of Pathology, Sentara Norfolk General Hospital (SNGH), 600 Gresham Drive, Norfolk, VA 23507, United States
| | - Rick J Jansen
- Department of Public Health, North Dakota State University, Fargo, ND 58102, United States
| | - Carolyn F O'Connor
- Department of Microbiology and Molecular Cell Biology, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Andrew J Isbell
- Department of Microbiology and Molecular Cell Biology, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Minglei Bian
- Department of Microbiology and Molecular Cell Biology, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Rui Qin
- Department of Health Sciences Research, Mayo Clinic Cancer Center, Mayo Clinic, Rochester, MN 55905, United States
| | - Patricia T Bassett
- Sentara Pathology and Pathology Sciences Medical Group, Department of Pathology, Sentara Norfolk General Hospital (SNGH), 600 Gresham Drive, Norfolk, VA 23507, United States
| | - Virginia J Hinson
- Sentara Pathology and Pathology Sciences Medical Group, Department of Pathology, Sentara Norfolk General Hospital (SNGH), 600 Gresham Drive, Norfolk, VA 23507, United States
| | - Kimberly A Dorsch
- Sentara Cancer Network, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States
| | - Brad W Kirby
- Sentara Cancer Network, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States
| | - Robert E Van Sciver
- Department of Microbiology and Molecular Cell Biology, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Angela M Tang-Tan
- Princess Anne High School, International Baccalaureate (IB) Gifted and Talented Program, 4400 Virginia Beach Boulevard, Virginia Beach, VA 23462, United States
| | - Elizabeth A Harden
- Dorothy G. Hoefer Comprehensive Breast Center, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States; Virginia Oncology Associates, 1051 Loftis Blvd, Suite 100, Newport News, VA 23606, United States
| | - David Z Chang
- Virginia Oncology Associates, 1051 Loftis Blvd, Suite 100, Newport News, VA 23606, United States
| | - Cynthia A Allen
- Sentara Cancer Network, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States
| | - Roger R Perry
- Department of Surgery, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States
| | - Richard A Hoefer
- Sentara Cancer Network, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States; Dorothy G. Hoefer Comprehensive Breast Center, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States; Sentara CarePlex Hospital, 11803 Jefferson Avenue, Suite 235, Newport News, Virginia 23606, United States
| | - Amy H Tang
- Department of Microbiology and Molecular Cell Biology, Leroy T. Canoles Jr. Cancer Research Center, Eastern Virginia Medical School, Norfolk, VA 23507, United States.
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