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Wang T, Liu L, Fang J, Jin H, Natarajan S, Sheppard H, Lu M, Turner G, Confer T, Johnson M, Steinberg J, Ha L, Yadak N, Jain R, Picketts DJ, Ma X, Murphy A, Davidoff AM, Glazer ES, Easton J, Chen X, Wang R, Yang J. Conditional c-MYC activation in catecholaminergic cells drives distinct neuroendocrine tumors: neuroblastoma vs somatostatinoma. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.03.12.584622. [PMID: 38559042 PMCID: PMC10980015 DOI: 10.1101/2024.03.12.584622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
The MYC proto-oncogenes (c-MYC, MYCN , MYCL ) are among the most deregulated oncogenic drivers in human malignancies including high-risk neuroblastoma, 50% of which are MYCN -amplified. Genetically engineered mouse models (GEMMs) based on the MYCN transgene have greatly expanded the understanding of neuroblastoma biology and are powerful tools for testing new therapies. However, a lack of c-MYC-driven GEMMs has hampered the ability to better understand mechanisms of neuroblastoma oncogenesis and therapy development given that c-MYC is also an important driver of many high-risk neuroblastomas. In this study, we report two transgenic murine neuroendocrine models driven by conditional c-MYC induction in tyrosine hydroxylase (Th) and dopamine β-hydroxylase (Dbh)-expressing cells. c-MYC induction in Th-expressing cells leads to a preponderance of Pdx1 + somatostatinomas, a type of pancreatic neuroendocrine tumor (PNET), resembling human somatostatinoma with highly expressed gene signatures of δ cells and potassium channels. In contrast, c-MYC induction in Dbh-expressing cells leads to onset of neuroblastomas, showing a better transforming capacity than MYCN in a comparable C57BL/6 genetic background. The c-MYC murine neuroblastoma tumors recapitulate the pathologic and genetic features of human neuroblastoma, express GD2, and respond to anti-GD2 immunotherapy. This model also responds to DFMO, an FDA-approved inhibitor targeting ODC1, which is a known MYC transcriptional target. Thus, establishing c-MYC-overexpressing GEMMs resulted in different but related tumor types depending on the targeted cell and provide useful tools for testing immunotherapies and targeted therapies for these diseases.
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Yuan Y, Alzrigat M, Rodriguez-Garcia A, Wang X, Bexelius TS, Johnsen JI, Arsenian-Henriksson M, Liaño-Pons J, Bedoya-Reina OC. Target Genes of c-MYC and MYCN with Prognostic Power in Neuroblastoma Exhibit Different Expressions during Sympathoadrenal Development. Cancers (Basel) 2023; 15:4599. [PMID: 37760568 PMCID: PMC10527308 DOI: 10.3390/cancers15184599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 09/06/2023] [Accepted: 09/13/2023] [Indexed: 09/29/2023] Open
Abstract
Deregulation of the MYC family of transcription factors c-MYC (encoded by MYC), MYCN, and MYCL is prevalent in most human cancers, with an impact on tumor initiation and progression, as well as response to therapy. In neuroblastoma (NB), amplification of the MYCN oncogene and over-expression of MYC characterize approximately 40% and 10% of all high-risk NB cases, respectively. However, the mechanism and stage of neural crest development in which MYCN and c-MYC contribute to the onset and/or progression of NB are not yet fully understood. Here, we hypothesized that subtle differences in the expression of MYCN and/or c-MYC targets could more accurately stratify NB patients in different risk groups rather than using the expression of either MYC gene alone. We employed an integrative approach using the transcriptome of 498 NB patients from the SEQC cohort and previously defined c-MYC and MYCN target genes to model a multigene transcriptional risk score. Our findings demonstrate that defined sets of c-MYC and MYCN targets with significant prognostic value, effectively stratify NB patients into different groups with varying overall survival probabilities. In particular, patients exhibiting a high-risk signature score present unfavorable clinical parameters, including increased clinical risk, higher INSS stage, MYCN amplification, and disease progression. Notably, target genes with prognostic value differ between c-MYC and MYCN, exhibiting distinct expression patterns in the developing sympathoadrenal system. Genes associated with poor outcomes are mainly found in sympathoblasts rather than in chromaffin cells during the sympathoadrenal development.
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Affiliation(s)
- Ye Yuan
- Department of Microbiology, Tumor and Cell Biology (MTC), Biomedicum, Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Mohammad Alzrigat
- Department of Microbiology, Tumor and Cell Biology (MTC), Biomedicum, Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Aida Rodriguez-Garcia
- Department of Microbiology, Tumor and Cell Biology (MTC), Biomedicum, Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Xueyao Wang
- Department of Microbiology, Tumor and Cell Biology (MTC), Biomedicum, Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Tomas Sjöberg Bexelius
- Paediatric Oncology Unit, Astrid Lindgren’s Children Hospital, SE-171 64 Solna, Sweden
- Department of Women’s and Children’s Health, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - John Inge Johnsen
- Department of Women’s and Children’s Health, Karolinska Institutet, SE-171 77 Stockholm, Sweden
| | - Marie Arsenian-Henriksson
- Department of Microbiology, Tumor and Cell Biology (MTC), Biomedicum, Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Judit Liaño-Pons
- Department of Microbiology, Tumor and Cell Biology (MTC), Biomedicum, Karolinska Institutet, SE-171 65 Stockholm, Sweden
| | - Oscar C. Bedoya-Reina
- Department of Microbiology, Tumor and Cell Biology (MTC), Biomedicum, Karolinska Institutet, SE-171 65 Stockholm, Sweden
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MYC in Brain Development and Cancer. Int J Mol Sci 2020; 21:ijms21207742. [PMID: 33092025 PMCID: PMC7588885 DOI: 10.3390/ijms21207742] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 10/16/2020] [Accepted: 10/16/2020] [Indexed: 12/27/2022] Open
Abstract
The MYC family of transcriptional regulators play significant roles in animal development, including the renewal and maintenance of stem cells. Not surprisingly, given MYC's capacity to promote programs of proliferative cell growth, MYC is frequently upregulated in cancer. Although members of the MYC family are upregulated in nervous system tumours, the mechanisms of how elevated MYC promotes stem cell-driven brain cancers is unknown. If we are to determine how increased MYC might contribute to brain cancer progression, we will require a more complete understanding of MYC's roles during normal brain development. Here, we evaluate evidence for MYC family functions in neural stem cell fate and brain development, with a view to better understand mechanisms of MYC-driven neural malignancies.
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Lee HJ, Jeong JH, Ryu JH. Anti-pancreatic cancer activity of Z-ajoene from garlic: An inhibitor of the Hedgehog/Gli/FoxM1 axis. J Funct Foods 2019. [DOI: 10.1016/j.jff.2019.03.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
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Ozkara HA, Ozkara S, Topçu S, Criss WE. Amplification of the C-MYC Oncogene in Non-small Cell Lung Cancer. TUMORI JOURNAL 2018; 85:508-11. [PMID: 10774575 DOI: 10.1177/030089169908500616] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Fresh non-small cell lung carcinoma surgical specimens were taken from 17 patients and 3 controls and screened for genetic abnormalities of the c-myc oncogene. Southern blot hybridization analysis demonstrated two- to fivefold amplification of the c-myc gene in 10 cases, i.e., 7 of 13 epidermoid lung carcinomas, 2 of 3 adenocarcinomas and 1 of 1 osteogenic sarcoma metastatic to the lung. Two- to fivefold amplification was observed in tissues from stage III and IV epidermoid carcinomas and adenocarcinomas of the lung. A correlation between cancer stage and c-myc gene amplification was found.
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Affiliation(s)
- H A Ozkara
- Department of Biochemistry, Hacettepe University, Faculty of Medicine, Ankara, Turkey.
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Zuo J, Chen Z, Zhong X, Lan W, Kuang Y, Huang D. FBP1 is highly expressed in human hypertrophic scars and increases fibroblast proliferation, apoptosis, and collagen expression. Connect Tissue Res 2018; 59:120-128. [PMID: 28362515 DOI: 10.1080/03008207.2017.1311327] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PURPOSE FBP1, one of the far-upstream element binding proteins(FBPs), is a distal upstream binding protein of c-myc, which is highly expressed in tumor tissues. This study aimed to investigate FBP1 expression in human hypertrophic scars and to determine the effects of FBP1 on fibroblasts. MATERIALS AND METHODS Human normal skin and scar specimens were collected during clinical surgery. One portion of each tissue specimen was embedded in paraffin and sliced to observe differences in histological features and FBP1 expression by immunohistochemistry and western blotting. The other portion of each tissue specimen was cultured to obtain fibroblasts. Fibroblasts from the second to the sixth passage were used for the experiments, which were divided into the following two groups: an experimental group, whose cells were transfected with an siRNA targeting FBP1, and a control group, whose cells where not transfected. MTT and TUNEL assays were performed, respectively, to assess fibroblast proliferation and apoptosis, and western blotting was performed to assess protein expression. RESULTS We obtained fibroblasts by primary tissue culture and found that FBP1 was highly expressed in hypertrophic scars. MTT assay showed that an siRNA targeting FBP1 significantly reduced fibroblast proliferation in siRNA-treated cells compared to control cells. TUNEL assay showed that there was no difference in apoptosis between the two groups; however, western blotting showed that collagen I, collagen III, c-myc, caspase-3, and caspase-9 expression levels were all decreased in the experimental group. CONCLUSION FBP1 is highly expressed in human hypertrophic scars and increases fibroblast proliferation, apoptosis and collagen expression.
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Affiliation(s)
- Jieyi Zuo
- a Department of Graduate School , Southern Medical University , Guangzhou , China.,b Department of Trauma and Microsurgery , Guangdong No. 2 People's Hospital , Guangzhou , China
| | - Zhiying Chen
- b Department of Trauma and Microsurgery , Guangdong No. 2 People's Hospital , Guangzhou , China
| | - Xinchao Zhong
- c Guangzhou Exon Biotechnology Co., Ltd , Guangzhou , China
| | - Wanli Lan
- b Department of Trauma and Microsurgery , Guangdong No. 2 People's Hospital , Guangzhou , China
| | - Yizhen Kuang
- b Department of Trauma and Microsurgery , Guangdong No. 2 People's Hospital , Guangzhou , China
| | - Dong Huang
- a Department of Graduate School , Southern Medical University , Guangzhou , China.,b Department of Trauma and Microsurgery , Guangdong No. 2 People's Hospital , Guangzhou , China
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A sequence polymorphism on 8q24 is associated with survival in hepatocellular carcinoma patients who received radiation therapy. Sci Rep 2018; 8:2264. [PMID: 29396413 PMCID: PMC5797243 DOI: 10.1038/s41598-018-20700-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 01/18/2018] [Indexed: 12/13/2022] Open
Abstract
There is a growing consensus that genetic variation in candidate genes can influence cancer progression and treatment effects. In this study, we genotyped the rs9642880 G > T polymorphism using DNA isolated from blood samples of 271 hepatocellular carcinoma (HCC) patients who received radiotherapy treatment. We found that patients who carried the GT or TT genotypes had significantly shorter median survival times (MSTs) compared to patients with the GG genotype (14.6 vs.21.4 months). The multivariate P value was 0.027, the hazard ratio (HR) was 1.38, and the 95% confidence interval was 1.04–1.84. Further analysis revealed that patients with the variant genotypes had an increased risk of poor tumour response to radiotherapy (P = 0.036 and 0.002 for stable disease and progressive disease, respectively) and higher incidence of multiple intrahepatic lesions (P = 0.026) and BCLC C stage (P = 0.027). Moreover, further stratified survival analyses revealed that at least radioresponse and BCLC stage contributed to the association between the rs9642880 G > T polymorphism and survival of HCC patients in this study (P value, 0.017 vs 0.053 for BCLC C stage vs B stage; 0.011 vs 0.531 for radioresponse SD + PD vs CR + PR). These results illustrate the potential association between rs9642880 G > T and survival in HCC patients who received radiotherapy treatment.
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Taniguchi K, Iwatsuki A, Sugito N, Shinohara H, Kuranaga Y, Oshikawa Y, Tajirika T, Futamura M, Yoshida K, Uchiyama K, Akao Y. Oncogene RNA helicase DDX6 promotes the process of c-Myc expression in gastric cancer cells. Mol Carcinog 2018; 57:579-589. [PMID: 29314290 DOI: 10.1002/mc.22781] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2017] [Revised: 12/06/2017] [Accepted: 01/02/2018] [Indexed: 11/08/2022]
Abstract
Human DEAD-box RNA helicase gene DDX6 was cloned from B-cell lymphoma cell line RC-K8. Previously, we reported that DDX6 acts as oncogene in several cancers such as colorectal cancer and hepatocellular carcinoma. However, the detailed mechanism of DDX6 action in carcinogenesis is largely unknown. In this study, we examined the functions of DDX6 in clinical gastric cancer (GC) samples and GC cells. DDX6 protein expression levels of cancer samples were higher than those of the adjacent normal tissues in 25 clinical GC samples (median value: 1.4 times higher). Also, the results of an RNA immunoprecipitation-assay (RIP-assay) showed that DDX6 associated with c-Myc mRNA. Moreover, enforced overexpression of DDX6 promoted both mRNA and protein expression of c-Myc in GC cells. On the other hand, the gene silencing of DDX6 induced growth suppression through down-regulation of c-Myc in GC cells grown in either two or three dimensions. Furthermore, c-Myc mRNA expression levels of cancer samples were higher than those of the adjacent normal tissues in DDX6 up-regulated-GC clinical samples. Our findings in this study suggested that DDX6 acted as oncogene in GC cells through promotion of c-Myc expression by association with the mRNA of c-Myc.
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Affiliation(s)
- Kohei Taniguchi
- Department of General and Gastroenterological Surgery, Osaka Medical College, Osaka, Takatsuki, Japan.,United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, Gifu, Japan
| | - Ayako Iwatsuki
- United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, Gifu, Japan
| | - Nobuhiko Sugito
- United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, Gifu, Japan
| | - Haruka Shinohara
- United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, Gifu, Japan
| | - Yuki Kuranaga
- United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, Gifu, Japan
| | - Yuki Oshikawa
- Department of Oncological Surgery, Gifu University School of Medicine, Gifu, Japan
| | - Toshihiro Tajirika
- Department of Oncological Surgery, Gifu University School of Medicine, Gifu, Japan
| | - Manabu Futamura
- Department of Oncological Surgery, Gifu University School of Medicine, Gifu, Japan
| | - Kazuhiro Yoshida
- Department of Oncological Surgery, Gifu University School of Medicine, Gifu, Japan
| | - Kazuhisa Uchiyama
- Department of General and Gastroenterological Surgery, Osaka Medical College, Osaka, Takatsuki, Japan
| | - Yukihiro Akao
- United Graduate School of Drug Discovery and Medical Information Sciences, Gifu University, Gifu, Japan
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Goetzman ES, Prochownik EV. The Role for Myc in Coordinating Glycolysis, Oxidative Phosphorylation, Glutaminolysis, and Fatty Acid Metabolism in Normal and Neoplastic Tissues. Front Endocrinol (Lausanne) 2018; 9:129. [PMID: 29706933 PMCID: PMC5907532 DOI: 10.3389/fendo.2018.00129] [Citation(s) in RCA: 132] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Accepted: 03/13/2018] [Indexed: 12/24/2022] Open
Abstract
That cancer cells show patterns of metabolism different from normal cells has been known for over 50 years. Yet, it is only in the past decade or so that an appreciation of the benefits of these changes has begun to emerge. Altered cancer cell metabolism was initially attributed to defective mitochondria. However, we now realize that most cancers do not have mitochondrial mutations and that normal cells can transiently adopt cancer-like metabolism during periods of rapid proliferation. Indeed, an encompassing, albeit somewhat simplified, conceptual framework to explain both normal and cancer cell metabolism rests on several simple premises. First, the metabolic pathways used by cancer cells and their normal counterparts are the same. Second, normal quiescent cells use their metabolic pathways and the energy they generate largely to maintain cellular health and organelle turnover and, in some cases, to provide secreted products necessary for the survival of the intact organism. By contrast, undifferentiated cancer cells minimize the latter functions and devote their energy to producing the anabolic substrates necessary to maintain high rates of unremitting cellular proliferation. Third, as a result of the uncontrolled proliferation of cancer cells, a larger fraction of the metabolic intermediates normally used by quiescent cells purely as a source of energy are instead channeled into competing proliferation-focused and energy-consuming anabolic pathways. Fourth, cancer cell clones with the most plastic and rapidly adaptable metabolism will eventually outcompete their less well-adapted brethren during tumor progression and evolution. This attribute becomes increasingly important as tumors grow and as their individual cells compete in a constantly changing and inimical environment marked by nutrient, oxygen, and growth factor deficits. Here, we review some of the metabolic pathways whose importance has gained center stage for tumor growth, particularly those under the control of the c-Myc (Myc) oncoprotein. We discuss how these pathways differ functionally between quiescent and proliferating normal cells, how they are kidnapped and corrupted during the course of transformation, and consider potential therapeutic strategies that take advantage of common features of neoplastic and metabolic disorders.
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Affiliation(s)
- Eric S. Goetzman
- Division of Medical Genetics, Children’s Hospital of Pittsburgh of UPMC, Pittsburgh, PA, United States
| | - Edward V. Prochownik
- Division of Hematology/Oncology, Children’s Hospital of Pittsburgh of UPMC, Pittsburgh, PA, United States
- Department of Microbiology and Molecular Genetics, University of Pittsburgh Medical Center, Pittsburgh, PA, United States
- University of Pittsburgh Hillman Cancer Center, Pittsburgh, PA, United States
- *Correspondence: Edward V. Prochownik,
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Jiang Y, Han K, Chen S, Wang Y, Zhang Z. Isolation, characterization, and expression of proto-oncogene cMyc in large yellow croaker Larimichthys crocea. FISH PHYSIOLOGY AND BIOCHEMISTRY 2017; 43:1443-1461. [PMID: 28550411 DOI: 10.1007/s10695-017-0384-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Accepted: 05/08/2017] [Indexed: 06/07/2023]
Abstract
cMyc is a vital transcription factor that involves in the regulation of cell proliferation, growth, differentiation, and apoptosis. In the present study, cMyc in Larimichthys crocea (Lc-cMyc) was cloned and analyzed for investigating its function. The full-length cDNA of Lc-cMyc was 2089 bp encoding a 440-amino-acid protein (Lc-cMyc). Lc-cMyc had the characteristic helix-loop-helix-leucine-zipper (HLH-LZ) DNA-binding domain and highly conservative in evolution. The expression of Lc-cMyc was detected by quantitative real-time PCR (qRT-PCR) and in situ hybridization, respectively. In tissues, the gender differences of Lc-cMyc expression existed only in gonad and Lc-cMyc was extremely significantly expressed in ovary with the highest level in 635-dph ovary, especially in stages II (late) and III (early) oocytes. A certain degree of expression was examined in head kidney of both sexes and testis with high expression in spermatocyte. In embryos, Lc-cMyc was expressed at all embryonic stages. In early embryogenesis (from two-cell stage to mutiple-cell stage), Lc-cMyc was expressed very highly with a peak at two-cell stage. In late embryogenesis (from blastula stage to 1-day-post-hatching stage), the high expression of Lc-cMyc was detected as the following order: 1-day-post-hatching stage > pre-hatching stage > the appearance-of-optic-vesicles stage = mutiple-cell stage > beginning-of-heart-pulsation stage. The distribution of Lc-cMyc concentrated gradually in the back of embryos until in the head. In conclusion, the spatio-temporal expression patterns of Lc-cMyc indicated an essential role in oogenesis and embryogenesis and contributed to insight into the molecular mechanisms of regulating pluripotency in large yellow croaker.
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Affiliation(s)
- Yonghua Jiang
- Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture, Fisheries College, Jimei University, Xiamen, 361021, China
- State Key Laboratory of Large Yellow Croaker Breeding, Ningde Fufa Fisheries Company Limited, Ningde, 352103, China
| | - Kunhuang Han
- Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture, Fisheries College, Jimei University, Xiamen, 361021, China
- State Key Laboratory of Large Yellow Croaker Breeding, Ningde Fufa Fisheries Company Limited, Ningde, 352103, China
| | - Shihai Chen
- Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture, Fisheries College, Jimei University, Xiamen, 361021, China
| | - Yilei Wang
- Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture, Fisheries College, Jimei University, Xiamen, 361021, China.
- State Key Laboratory of Large Yellow Croaker Breeding, Ningde Fufa Fisheries Company Limited, Ningde, 352103, China.
| | - Ziping Zhang
- College of Animal Science, Fujian Agriculture and Forestry University, Fuzhou, 350002, China.
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Abstract
Unique to striated muscle cells, transverse tubules (t-tubules) are membrane organelles that consist of sarcolemma penetrating into the myocyte interior, forming a highly branched and interconnected network. Mature t-tubule networks are found in mammalian ventricular cardiomyocytes, with the transverse components of t-tubules occurring near sarcomeric z-discs. Cardiac t-tubules contain membrane microdomains enriched with ion channels and signaling molecules. The microdomains serve as key signaling hubs in regulation of cardiomyocyte function. Dyad microdomains formed at the junctional contact between t-tubule membrane and neighboring sarcoplasmic reticulum are critical in calcium signaling and excitation-contraction coupling necessary for beat-to-beat heart contraction. In this review, we provide an overview of the current knowledge in gross morphology and structure, membrane and protein composition, and function of the cardiac t-tubule network. We also review in detail current knowledge on the formation of functional membrane subdomains within t-tubules, with a particular focus on the cardiac dyad microdomain. Lastly, we discuss the dynamic nature of t-tubules including membrane turnover, trafficking of transmembrane proteins, and the life cycles of membrane subdomains such as the cardiac BIN1-microdomain, as well as t-tubule remodeling and alteration in diseased hearts. Understanding cardiac t-tubule biology in normal and failing hearts is providing novel diagnostic and therapeutic opportunities to better treat patients with failing hearts.
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Affiliation(s)
- TingTing Hong
- Cedars-Sinai Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California; and Department of Medicine, University of California Los Angeles, Los Angeles, California
| | - Robin M Shaw
- Cedars-Sinai Heart Institute, Cedars-Sinai Medical Center, Los Angeles, California; and Department of Medicine, University of California Los Angeles, Los Angeles, California
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12
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Vaz AP, Deb S, Rachagani S, Dey P, Muniyan S, Lakshmanan I, Karmakar S, Smith L, Johansson S, Lele S, Ouellette M, Ponnusamy MP, Batra SK. Overexpression of PD2 leads to increased tumorigenicity and metastasis in pancreatic ductal adenocarcinoma. Oncotarget 2016; 7:3317-31. [PMID: 26689992 PMCID: PMC4823108 DOI: 10.18632/oncotarget.6580] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 11/16/2015] [Indexed: 12/14/2022] Open
Abstract
Pancreatic differentiation 2 (PD2), an important subunit of the human PAF complex, was identified after differential screening analysis of 19q13 amplicon, and its overexpression induces oncogenic transformation of NIH3T3 cells, hence raising the possibility of a role for PD2 in tumorigenesis and metastasis. To test this hypothesis, we analyzed here the functional role and clinical significance of PD2 in pancreatic ductal adenocarcinoma (PDAC) and its pathogenesis. Using immunohistochemical analysis, we found that PD2 is detected in the acini but not in the ducts in the normal pancreas. In human PDAC specimens, PD2 was instead primarily detected in the ducts (12/48 patients 25%; p-value < 0.0001), thereby showing that PDAC correlates with increased ductal expression of PD2. Consistently, PD2 expression was increased in telomerase-immortalized human pancreatic ductal cells (HPNE cells) modified to express the HPV16 E6 and E7 proteins, whose respective functions are to block p53 and RB. In addition, ectopic expression of PD2 in PDAC cells (Capan-1 and SW1990) led to increased clonogenicity and migration in vitro, and tumor growth and metastasis in vivo. Interestingly, PD2 overexpression also resulted in enrichment of cancer stem cells (CSCs) and upregulation of oncogenes such as c-Myc and cell cycle progression marker, cyclin D1. Taken together, our results support that PD2 is overexpressed in the ducts of PDAC tissues, and results in tumorigenesis and metastasis via upregulation of oncogenes such as c-Myc and cyclin hence D1 implicating PD2 upregulation in pancreatic oncogenesis with targeted therapeutic potential.
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MESH Headings
- Adenocarcinoma/genetics
- Adenocarcinoma/metabolism
- Adenocarcinoma/secondary
- Animals
- Apoptosis
- Blotting, Western
- Carcinoma, Pancreatic Ductal/genetics
- Carcinoma, Pancreatic Ductal/metabolism
- Carcinoma, Pancreatic Ductal/secondary
- Cell Cycle
- Cell Differentiation
- Cell Movement
- Cell Proliferation
- Cell Transformation, Neoplastic/genetics
- Cell Transformation, Neoplastic/metabolism
- Cell Transformation, Neoplastic/pathology
- Cells, Cultured
- Female
- Gene Expression Regulation, Neoplastic
- Humans
- Immunoenzyme Techniques
- Mice
- Mice, Nude
- NIH 3T3 Cells
- Neoplastic Stem Cells/metabolism
- Neoplastic Stem Cells/pathology
- Nuclear Proteins/genetics
- Nuclear Proteins/metabolism
- Pancreatic Neoplasms/genetics
- Pancreatic Neoplasms/metabolism
- Pancreatic Neoplasms/pathology
- RNA, Messenger/genetics
- Real-Time Polymerase Chain Reaction
- Reverse Transcriptase Polymerase Chain Reaction
- Transcription Factors
- Xenograft Model Antitumor Assays
- Pancreatic Neoplasms
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Affiliation(s)
- Arokia Priyanka Vaz
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Shonali Deb
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Satyanarayana Rachagani
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Parama Dey
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Sakthivel Muniyan
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Imayavaramban Lakshmanan
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Saswati Karmakar
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Lynette Smith
- Department of Biostatistics, University of Nebraska Medical Center, Omaha, NE, USA
| | - Sonny Johansson
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Subodh Lele
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Michel Ouellette
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Moorthy P. Ponnusamy
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
- Eppley Institute for Research in Cancer and Allied Disease, University of Nebraska Medical Center, Omaha, NE, USA
| | - Surinder K. Batra
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
- Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE, USA
- Eppley Institute for Research in Cancer and Allied Disease, University of Nebraska Medical Center, Omaha, NE, USA
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BIN1 regulates dynamic t-tubule membrane. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1863:1839-47. [PMID: 26578114 DOI: 10.1016/j.bbamcr.2015.11.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Revised: 10/31/2015] [Accepted: 11/09/2015] [Indexed: 11/23/2022]
Abstract
Cardiac transverse tubules (t-tubules) are specific membrane organelles critical in calcium signaling and excitation-contraction coupling required for beat-to-beat heart contraction. T-tubules are highly branched and form an interconnected network that penetrates the myocyte interior to form junctions with the sarcoplasmic reticulum. T-tubules are selectively enriched with specific ion channels and proteins crucial in calcium transient development necessary in excitation-contraction coupling, thus t-tubules are a key component of cardiac myocyte function. In this review, we focus primarily on two proteins concentrated within the t-tubular network, the L-type calcium channel (LTCC) and associated membrane anchor protein, bridging integrator 1 (BIN1). Here, we provide an overview of current knowledge in t-tubule morphology, composition, microdomains, as well as the dynamics of the t-tubule network. Secondly, we highlight multiple aspects of BIN1-dependent t-tubule function, which includes forward trafficking of LTCCs to t-tubules, LTCC clustering at t-tubule surface, microdomain organization and regulation at t-tubule membrane, and the formation of a slow diffusion barrier within t-tubules. Lastly, we describe progress in characterizing how acquired human heart failure can be attributed to abnormal BIN1 transcription and associated t-tubule remodeling. Understanding BIN1-regulated cardiac t-tubule biology in human heart failure management has the dual benefit of promoting progress in both biomarker development and therapeutic target identification. This article is part of a Special Issue entitled: Cardiomyocyte Biology: Integration of Developmental and Environmental Cues in the Heart edited by Marcus Schaub and Hughes Abriel.
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Erichsen DA, Armstrong MB, Wechsler DS. Mxi1 and mxi1-0 antagonize N-myc function and independently mediate apoptosis in neuroblastoma. Transl Oncol 2015; 8:65-74. [PMID: 25749179 PMCID: PMC4350643 DOI: 10.1016/j.tranon.2015.01.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Accepted: 01/19/2015] [Indexed: 12/18/2022] Open
Abstract
Neuroblastoma (NB) is the third most common malignancy of childhood, and outcomes for children with advanced disease remain poor; amplification of the MYCN gene portends a particularly poor prognosis. Mxi1 antagonizes N-Myc by competing for binding to Max and E-boxes. Unlike N-Myc, Mxi1 mediates transcriptional repression and suppresses cell proliferation. Mxi1 and Mxi1-0 (an alternatively transcribed Mxi1 isoform) share identical Max and DNA binding domains but differ in amino-terminal sequences. Because of the conservation of these critical binding domains, we hypothesized that Mxi1-0 antagonizes N-Myc activity similar to Mxi1. SHEP NB cells and SHEP cells stably transfected with MYCN (SHEP/MYCN) were transiently transfected with vectors containing full-length Mxi1, full-length Mxi1-0, or the common Mxi domain encoded by exons 2 to 6 (ex2-6). After incubation in low serum, parental SHEP/MYCN cell numbers were reduced compared with SHEP cells. Activated caspase-3 staining and DNA fragmentation ELISA confirmed that SHEP/MYCN cells undergo apoptosis in low serum, while SHEP/MYCN cells transfected with Mxi1 or Mxi1-0 do not. However, SHEP/MYCN cells transfected with Mxi1 or Mxi1-0 and grown in normal serum showed proliferation rates similar to SHEP cells. Mxi ex2-6 did not affect cell number in low or normal serum, suggesting that amino terminal domains of Mxi1 and Mxi1-0 are critical for antagonism. In the absence of N-Myc, Mxi1 and Mxi1-0 induce apoptosis independently through the caspase-8-dependent extrinsic pathway, while N-Myc activates the caspase-9-dependent intrinsic pathway. Together, these data indicate that Mxi1 and Mxi1-0 antagonize N-Myc but also independently impact NB cell survival.
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Affiliation(s)
- David A Erichsen
- Section of Pediatric Hematology-Oncology, Department of Pediatrics and Communicable Diseases, The University of Michigan School of Medicine, Ann Arbor, MI, USA
| | - Michael B Armstrong
- Division of Pediatric Hematology-Oncology, Department of Pediatrics, Duke University Medical Center, Durham, NC, USA
| | - Daniel S Wechsler
- Division of Pediatric Hematology-Oncology, Department of Pediatrics, Duke University Medical Center, Durham, NC, USA; Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, USA.
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OVA12, a novel tumor antigen, promotes cancer cell growth and inhibits 5-fluorouracil-induced apoptosis. Cancer Lett 2015; 357:141-151. [DOI: 10.1016/j.canlet.2014.11.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 11/11/2014] [Accepted: 11/11/2014] [Indexed: 11/22/2022]
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Morton JP, Sansom OJ. MYC-y mice: from tumour initiation to therapeutic targeting of endogenous MYC. Mol Oncol 2013; 7:248-58. [PMID: 23523308 PMCID: PMC5528411 DOI: 10.1016/j.molonc.2013.02.015] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Accepted: 02/18/2013] [Indexed: 12/15/2022] Open
Abstract
MYC is one of the best-studied oncogenes in terms of mouse models of malignancy. MYC overexpression has been targeted to several tissues using transgenic constructs, and more recently as mouse models have evolved, conditional systems have been developed to allow the regulation of MYC expression or activity in vivo. The ability to target MYC expression to specific tissues and cell lineages, as well as the ability to regulate that expression, has made genetically engineered mouse models (GEMM) a valuable resource for studying the importance of MYC in the process of tumourigenesis. Here we review how these models have been used to address the role of MYC in tumour initiation and maintenance, how subtle changes in levels of MYC can influence tumourigenesis, and finally the ongoing efforts to target endogenous MYC genetically and with novel therapies.
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Affiliation(s)
- Jennifer P Morton
- Beatson Institute for Cancer Research, Garscube Estate, Switchback Rd, Glasgow G61 1BD, UK
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Guenthoer J, Diede SJ, Tanaka H, Chai X, Hsu L, Tapscott SJ, Porter PL. Assessment of palindromes as platforms for DNA amplification in breast cancer. Genome Res 2011; 22:232-45. [PMID: 21752925 DOI: 10.1101/gr.117226.110] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
DNA amplification, particularly of chromosomes 8 and 11, occurs frequently in breast cancer and is a key factor in tumorigenesis, often associated with poor prognosis. The mechanisms involved in the amplification of these regions are not fully understood. Studies from model systems have demonstrated that palindrome formation can be an early step in DNA amplification, most notably seen in the breakage-fusion-bridge (BFB) cycle. Therefore, palindromes might be associated with gene amplicons in breast cancer. To address this possibility, we coupled high-resolution palindrome profiling by the Genome-wide Analysis of Palindrome Formation (GAPF) assay with genome-wide copy-number analyses on a set of breast cancer cell lines and primary tumors to spatially associate palindromes and copy-number gains. We identified GAPF-positive regions distributed nonrandomly throughout cell line and tumor genomes, often in clusters, and associated with copy-number gains. Commonly amplified regions in breast cancer, chromosomes 8q and 11q, had GAPF-positive regions flanking and throughout the copy-number gains. We also identified amplification-associated GAPF-positive regions at similar locations in subsets of breast cancers with similar characteristics (e.g., ERBB2 amplification). These shared positive regions offer the potential to evaluate the utility of palindromes as prognostic markers, particularly in premalignant breast lesions. Our results implicate palindrome formation in the amplification of regions with key roles in breast tumorigenesis, particularly in subsets of breast cancers.
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Affiliation(s)
- Jamie Guenthoer
- Division of Human Biology, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA
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Braun K, Ehemann V, Wiessler M, Pipkorn R, Didinger B, Mueller G, Waldeck W. High-resolution flow cytometry: a suitable tool for monitoring aneuploid prostate cancer cells after TMZ and TMZ-BioShuttle treatment. Int J Med Sci 2009; 6:338-47. [PMID: 19946604 PMCID: PMC2781174 DOI: 10.7150/ijms.6.338] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2009] [Accepted: 11/16/2009] [Indexed: 11/05/2022] Open
Abstract
If metastatic prostate cancer gets resistant to antiandrogen therapy, there are few treatment options, because prostate cancer is not very sensitive to cytostatic agents. Temozolomide (TMZ) as an orally applicable chemotherapeutic substance has been proven to be effective and well tolerated with occasional moderate toxicity especially for brain tumors and an application to prostate cancer cells seemed to be promising. Unfortunately, TMZ was inefficient in the treatment of symptomatic progressive hormone-refractory prostate cancer (HRPC). The reasons could be a low sensitivity against TMZ the short plasma half-life of TMZ, non-adapted application regimens and additionally, the aneuploid DNA content of prostate cancer cells suggesting different sensitivity against therapeutical interventions e.g. radiation therapy or chemotherapy. Considerations to improve this unsatisfying situation resulted in the realization of higher local TMZ concentrations, sufficient to kill cells regardless of intrinsic cellular sensitivity and cell DNA-index. Therefore, we reformulated the TMZ by ligation to a peptide-based carrier system called TMZ-BioShuttle for intervention. The modular-composed carrier consists of a transmembrane transporter (CPP), connected to a nuclear localization sequence (NLS) cleavably-bound, which in turn was coupled with TMZ. The NLS-sequence allows an active delivery of the TMZ into the cell nucleus after transmembrane passage of the TMZ-BioShuttle and intra-cytoplasm enzymatic cleavage and separation from the CPP. This TMZ-BioShuttle could contribute to improve therapeutic options exemplified by the hormone refractory prostate cancer. The next step was to syllogize a qualified method monitoring cell toxic effects in a high sensitivity under consideration of the ploidy status. The high-resolution flow cytometric analysis showed to be an appropriate system for a better detection and distinction of several cell populations dependent on their different DNA-indices as well as changes in proliferation of cell populations after chemotherapeutical treatment.
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Affiliation(s)
- Klaus Braun
- German Cancer Research Center, Dept. of Medical Physics in Radiooncology, INF 280, D-69120 Heidelberg, Germany.
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Chung CC, Magalhaes WCS, Gonzalez-Bosquet J, Chanock SJ. Genome-wide association studies in cancer--current and future directions. Carcinogenesis 2009; 31:111-20. [PMID: 19906782 DOI: 10.1093/carcin/bgp273] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Genome-wide association studies (GWAS) have emerged as an important tool for discovering regions of the genome that harbor genetic variants that confer risk for different types of cancers. The success of GWAS in the last 3 years is due to the convergence of new technologies that can genotype hundreds of thousands of single-nucleotide polymorphism markers together with comprehensive annotation of genetic variation. This approach has provided the opportunity to scan across the genome in a sufficiently large set of cases and controls without a set of prior hypotheses in search of susceptibility alleles with low effect sizes. Generally, the susceptibility alleles discovered thus far are common, namely, with a frequency in one or more population of >10% and each allele confers a small contribution to the overall risk for the disease. For nearly all regions conclusively identified by GWAS, the per allele effect sizes estimated are <1.3. Consequently, the findings of GWAS underscore the complex nature of cancer and have focused attention on a subset of the genetic variants that comprise the genomic architecture of each type of cancer, which already can differ substantially by the number of regions associated with specific types of cancer. For instance, in prostate cancer, there could be >30 distinct regions harboring common susceptibility alleles identified by GWAS, whereas in lung cancer, a disease strongly driven by exposure to tobacco products, so far, only three regions have been conclusively established. To date, >85 regions have been conclusively associated in over a dozen different cancers, yet no more than five regions have been associated with more than one distinct cancer type. GWAS are an important discovery tool that require extensive follow-up to map each region, investigate the biological mechanism underpinning the association and eventually test the optimal markers for assessing risk for a disease or its outcome, such as in pharmacogenomics, the study of the effect of genetic variation on pharmacological interventions. The success of GWAS has opened new horizons for exploration and highlighted the complex genomic architecture of disease susceptibility.
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Affiliation(s)
- Charles C Chung
- Laboratory of Translational Genomics, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, MD 20892-4608, USA
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Abstract
PURPOSE OF REVIEW The role of genetic susceptibility in the development of urinary bladder cancer is unclear, as it is in many other types of cancer. Since 2007, however, an innovative research approach (i.e. genome-wide association studies or GWASs) has led to the identification of numerous genomic loci that harbor susceptibility factors for one or more cancer sites. All GWASs have been published in high-impact journals and the strengths of the design are acknowledged by all experts, but there is criticism about the relevance of the results. Late 2008, the first GWAS in bladder cancer was published. RECENT FINDINGS In this review, the principles of GWASs are explained, as well as their strengths and limitations. The study in bladder cancer among 4000 cases and 38,000 controls identified three new susceptibility loci at 8q24, 3q28, and 5p15 that increase the risk of bladder cancer by 22, 19, and 16%, respectively. The results of two other GWASs in bladder cancer are expected to appear this year. Joint analysis of the three studies will probably identify additional susceptibility loci. SUMMARY The results of bladder cancer GWASs may point the way to yet unknown disease mechanisms. So far, the findings are not sufficiently discriminative for risk predictions to be used in clinical care or public health.
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Wang M, Wang M, Zhang W, Yuan L, Fu G, Wei Q, Zhang Z. Common genetic variants on 8q24 contribute to susceptibility to bladder cancer in a Chinese population. Carcinogenesis 2009; 30:991-6. [DOI: 10.1093/carcin/bgp091] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
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22
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Zhao H, Zhang J, Lu J, He X, Chen C, Li X, Gong L, Bao G, Fu Q, Chen S, Lin W, Shi H, Ma J, Liu X, Ma Q, Yao L. Reduced expression of N-Myc downstream-regulated gene 2 in human thyroid cancer. BMC Cancer 2008; 8:303. [PMID: 18940011 PMCID: PMC2576469 DOI: 10.1186/1471-2407-8-303] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2008] [Accepted: 10/22/2008] [Indexed: 01/24/2023] Open
Abstract
Background NDRG2 (N-Myc downstream-regulated gene 2) was initially cloned in our laboratory. Previous results have shown that NDRG2 expressed differentially in normal and cancer tissues. Specifically, NDRG2 mRNA was down-regulated or undetectable in several human cancers, and over-expression of NDRG2 inhibited the proliferation of cancer cells. NDRG2 also exerts important functions in cell differentiation and tumor suppression. However, it remains unclear whether NDRG2 participates in carcinogenesis of the thyroid. Methods In this study, we investigated the expression profile of human NDRG2 in thyroid adenomas and carcinomas, by examining tissues from individuals with thyroid adenomas (n = 40) and carcinomas (n = 35), along with corresponding normal tissues. Immunohistochemistry, quantitative RT-PCR and western blot methods were utilized to determine both the protein and mRNA expression status of Ndrg2 and c-Myc. Results The immunostaining analysis revealed a decrease of Ndrg2 expression in thyroid carcinomas. When comparing adenomas or carcinomas with adjacent normal tissue from the same individual, the mRNA expression level of NDRG2 was significantly decreased in thyroid carcinoma tissues, while there was little difference in adenoma tissues. This differential expression was confirmed at the protein level by western blotting. However, there were no significant correlations of NDRG2 expression with gender, age, different histotypes of thyroid cancers or distant metastases. Conclusion Our data indicates that NDRG2 may participate in thyroid carcinogenesis. This finding provides novel insight into the important role of NDRG2 in the development of thyroid carcinomas. Future studies are needed to address whether the down-regulation of NDRG2 is a cause or a consequence of the progression from a normal thyroid to a carcinoma.
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Affiliation(s)
- Huadong Zhao
- Department of General Surgery, Tangdu Hospital, The Fourth Military Medical University, Xi'an, 710038, PR China.
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Sequence variant on 8q24 confers susceptibility to urinary bladder cancer. Nat Genet 2008; 40:1307-12. [PMID: 18794855 DOI: 10.1038/ng.229] [Citation(s) in RCA: 337] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2008] [Accepted: 07/22/2008] [Indexed: 11/08/2022]
Abstract
We conducted a genome-wide SNP association study on 1,803 urinary bladder cancer (UBC) cases and 34,336 controls from Iceland and The Netherlands and follow up studies in seven additional case-control groups (2,165 cases and 3,800 controls). The strongest association was observed with allele T of rs9642880 on chromosome 8q24, 30 kb upstream of MYC (allele-specific odds ratio (OR) = 1.22; P = 9.34 x 10(-12)). Approximately 20% of individuals of European ancestry are homozygous for rs9642880[T], and their estimated risk of developing UBC is 1.49 times that of noncarriers. No association was observed between UBC and the four 8q24 variants previously associated with prostate, colorectal and breast cancers, nor did rs9642880 associate with any of these three cancers. A weaker signal, but nonetheless of genome-wide significance, was captured by rs710521[A] located near TP63 on chromosome 3q28 (allele-specific OR = 1.19; P = 1. 15 x 10(-7)).
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Sheng L, Cai F, Zhu Y, Pal A, Athanasiou M, Orrison B, Blair DG, Hughes SH, Coffin JM, Lewis AM, Peden K. Oncogenicity of DNA in vivo: tumor induction with expression plasmids for activated H-ras and c-myc. Biologicals 2008; 36:184-97. [PMID: 18218323 DOI: 10.1016/j.biologicals.2007.11.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2007] [Revised: 11/07/2007] [Accepted: 11/13/2007] [Indexed: 01/04/2023] Open
Abstract
All vaccines and other biological products contain contaminating residual DNA derived from the production cell substrate. Whether this residual cell-substrate DNA can induce tumors in vaccine recipients and thus represent a risk factor has been debated for over 50 years without resolution. As a first step in resolving this issue, we have generated expression plasmids for the activated human H-ras oncogene and for the murine c-myc proto-oncogene. Their oncogenic activity was confirmed in vitro using the focus-formation transformation assay. Two strains of adult and newborn immune-competent mice were inoculated with different amounts of either plasmid alone or with a combination of the H-ras and c-myc plasmids. Tumors developed only in mice inoculated with both plasmids and only at the highest amount of DNA (12.5 microg of each plasmid). The NIH Swiss mouse was more sensitive than the C57BL/6 mouse, and newborn animals were more sensitive than adults. Cell lines were established from the tumors. PCR and Southern hybridization analyses demonstrated that both inoculated oncogenes were present in all of the tumor-derived cell lines and that the cells in the tumors were clonal. Western analysis demonstrated that both oncoproteins were expressed in these cell lines. These results demonstrate that cellular oncogenes can induce tumors following subcutaneous inoculation. Such information provides a possible way of evaluating and estimating the theoretical oncogenic risk posed by residual cell-substrate DNA in vaccines.
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Affiliation(s)
- Li Sheng
- Division of Viral Products, OVRR, CBER, FDA, Building 29A, Room 3D08, 29 Lincoln Drive, Bethesda, MD 20892, USA
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Sato H, Minei S, Hachiya T, Yoshida T, Takimoto Y. Fluorescence in situ hybridization analysis of c-myc amplification in stage TNM prostate cancer in Japanese patients. Int J Urol 2006; 13:761-6. [PMID: 16834657 DOI: 10.1111/j.1442-2042.2006.01399.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
OBJECTIVE Genetic aberration such as the amplification of c-myc has been commonly found in advanced prostate cancer. The aim of this study was to elucidate chromosome 8 alteration, including a gain and amplification of 8q24 (c-myc gene), related to the progression and survival in advanced (Stage C) prostate cancer. MATERIALS AND METHODS We used dual-probe fluorescence in situ hybridization with a centromere-specific probe for chromosome 8 (8cen), and with a region-specific probe for c-myc (8q24) to evaluate genetic changes in tumor samples from 50 patients who had undergone radical retropubic prostatectomy from 1986 to 2001. RESULTS We classified the 8cen and c-myc copy numbers as normal, gain and amplification. The carcinoma foci with extra copies of c-myc, which was defined in 35 cases (70%), were divided into two groups: (a) a simple gain of the whole chromosome 8 (no increase in the c-myc copy number relative to the chromosome 8 centromere), which was identified in 15 cases (30%); and (b) a substantial amplification of c-myc (additional increases [AI] in the c-myc copy number relative to the chromosome 8 centromere), which was detected in 20 cases (40%). AI-c-myc was strongly associated with higher histopathological grades and Gleason's scores (P = 0.0330, 0.0190, respectively). Patients with the AI-c-myc had earlier disease progression (P = 0.0029) and earlier cancer death (P = 0.0087) than did patients with normal patterns. CONCLUSION Identification of an AI-c-myc may serve as a potential marker of prostate cancer progression.
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Affiliation(s)
- Hirotaka Sato
- Departments of Urology, Nihon University School of Medicine, Tokyo, Japan.
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Kabilova TO, Vladimirova AV, Repkova MN, Ven’yaminova AG, Chernolovskaya EL, Vlasov VV. Silencing of c-myc gene expression using enzymatically and chemically synthesized siRNAs. Mol Biol 2006. [DOI: 10.1134/s0026893306060136] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Zhang J, Li F, Liu X, Shen L, Liu J, Su J, Zhang W, Deng Y, Wang L, Liu N, Han W, Zhang J, Ji S, Yang A, Han H, Yao L. The repression of human differentiation-related gene NDRG2 expression by Myc via Miz-1-dependent interaction with the NDRG2 core promoter. J Biol Chem 2006; 281:39159-68. [PMID: 17050536 DOI: 10.1074/jbc.m605820200] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The N-myc downstream-regulated gene 1 (ndrg1) is highly expressed in N-myc knock-out mice through an unknown regulatory mechanism. As one member of the human NDRG gene family, NDRG2 encodes a protein highly homologous to Ndrg1. However, it is uncertain whether the expression of human NDRG2 is regulated by Myc because mouse ndrg2 and -3 are not affected by Myc. In this study, we provide the novel evidence that the expression of human NDRG2 is down-regulated by Myc via transcriptional repression. A high level of NDRG2 was observed as Myc expression was reduced in differentiated cells, whereas a low level of NDRG2 was shown following increased Myc expression upon serum stimulation. The ectopic expression of c-Myc dramatically reduces the cellular Ndrg2 protein and mRNA level. We further identified the core promoter region of NDRG2 that is required for Myc repression on NDRG2 transcription, and we verified the interaction of Myc with the core promoter region both in vitro and in vivo. Moreover, the c-Myc-mediated repression of NDRG2 requires association with Miz-1, and possibly the recruitment of other epigenetic factors, such as histone deacetylases, to the promoter. The regulatory function of Myc on NDRG2 gene expression implicated the role of the Ndrg2 in regulating cell differentiation.
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Affiliation(s)
- Jian Zhang
- Institute of Molecular Biology and the State Key Laboratory of Cancer Biology, Fourth Military Medical University, 710032 Xi'an, China
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Pirity M, Blanck JK, Schreiber-Agus N. Lessons learned from Myc/Max/Mad knockout mice. Curr Top Microbiol Immunol 2006; 302:205-34. [PMID: 16620030 DOI: 10.1007/3-540-32952-8_8] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The past two decades of gene targeting experiments have allowed us to make significant strides towards understanding how the Myc/Max/Mad network influences multiple aspects of cellular behavior during development. Here we summarize the findings obtained from the myc/max/mad knockout mice generated to date, namely those in which the N-myc, c-myc, L-myc, mad1, mxi1, mad3, mnt, or max genes have been targeted. A compilation of lessons we have learned from these myc/max/mad knockout mouse models, and suggestions as to where future efforts could be focused, are also presented.
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Affiliation(s)
- M Pirity
- Department of Molecular Genetics, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Ullmann 809, Bronx, NY 10461, USA
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Tsuneoka M, Fujita H, Arima N, Teye K, Okamura T, Inutsuka H, Koda Y, Shirouzu K, Kimura H. Mina53 as a potential prognostic factor for esophageal squamous cell carcinoma. Clin Cancer Res 2005; 10:7347-56. [PMID: 15534111 DOI: 10.1158/1078-0432.ccr-03-0543] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE We previously identified mina53, a novel Myc target gene. Here we investigated whether mina53 is related to esophageal squamous cell carcinoma (ESCC), a disease with poor prognosis. EXPERIMENTAL DESIGN Mina53 expression was suppressed in ESCC cell lines by a RNA interference method to investigate whether Mina53 is involved in cell proliferation. Expression of Mina53 was investigated by Western blotting in tissue sections from patients with ESCC. Immunohistochemical analysis of Mina53 was carried out and compared with that using anti-Ki-67 antibody. Finally, the level of Mina53 expression was compared with the length of survival of patients with ESCC. RESULTS Reduction of mina53 expression by RNA interference suppressed cell proliferation in ESCC cell lines. Western blot analysis of surgically resected ESCC specimens indicated that the expression of Mina53 in tumors was increased compared with that in adjacent nonneoplastic tissues in all four specimens examined. When formalin-fixed specimens from 52 patients with ESCC were stained immunohistochemically, it was found that Mina53 was highly expressed in 83% of specimens. Anti-Mina53 antibody stained tumors more efficiently than antibody against Ki-67, a cell proliferation biomarker, in some cancer specimens. Patients with high expression of Mina53 had shorter survival periods, whereas the expression level of Ki-67 in ESCC showed no relationship to patient outcome. CONCLUSIONS Taken together, our results indicate that expression of Mina53 is a characteristic feature of ESCC and suggest that immunostaining by anti-Mina53 antibody may be useful as a potential prognostic indicator.
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Affiliation(s)
- Makoto Tsuneoka
- Division of Human Genetics, Department of Forensic Medicine, Kurume University School of Medicine, Kurume, Japan.
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Tsuneoka M, Teye K, Arima N, Soejima M, Otera H, Ohashi K, Koga Y, Fujita H, Shirouzu K, Kimura H, Koda Y. A Novel Myc-target Gene, mimitin, That Is Involved in Cell Proliferation of Esophageal Squamous Cell Carcinoma. J Biol Chem 2005; 280:19977-85. [PMID: 15774466 DOI: 10.1074/jbc.m501231200] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Myc is a ubiquitous mediator of cell proliferation that transactivates the expression of various genes through E-box sites. Here we report a novel gene, mimitin (Myc-induced mitochondrial protein), that encodes a mitochondrial protein with a molecular mass of 20 kDa. We demonstrated that the transcription of mimitin is directly stimulated by c-Myc. To investigate the role of Mimitin, its expression was suppressed by the RNA interference (RNAi) technique. Whereas specific inhibition of mimitin expression did not affect cell proliferation in human cervical carcinoma, colon adenocarcinoma, and hepatocarcinoma cell lines, it did suppress cell proliferation in human glioblastoma, esophageal squamous cell carcinoma (ESCC), and embryonic lung fibroblastic cells, with the greatest suppression efficiency in ESCC cells. To investigate whether mimitin is related to tumorigenesis in ESCC in vivo, the expression of Mimitin protein in ESCC tissues was studied. Mimitin was highly expressed in 80% (28 of 35) of ESCC tumors, suggesting that high expression of Mimitin is a characteristic feature of ESCC. The expression level of Mimitin was found to be correlated with that of c-Myc and cell proliferation, but not with the histopathological grade, stage of cancer, or age of patients. Taken together, these results suggest that the novel gene mimitin is a direct transcriptional target of c-Myc, and is involved in Myc-dependent cell proliferation at least in ESCC cells.
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Affiliation(s)
- Makoto Tsuneoka
- Division of Human Genetics, Department of Forensic Medicine, Kurume University School of Medicine, Japan.
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Zaharieva B, Simon R, Ruiz C, Oeggerli M, Mihatsch MJ, Gasser T, Sauter G, Toncheva D. High-throughput tissue microarray analysis ofCMYC amplificationin urinary bladder cancer. Int J Cancer 2005; 117:952-6. [PMID: 15986448 DOI: 10.1002/ijc.21253] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Alterations of chromosome 8, preferentially deletions of 8p and gains of 8q, belong to the most frequent cytogenetic changes in bladder cancer. CMYC on 8q24 is a candidate oncogene in this region. Little is known about the clinical significance of CMYC copy number changes in urinary bladder cancer because its frequency is low and a limited numbers of tumors were analyzed so far. To investigate the impact of CMYC alterations on tumor progression and patient prognosis in bladder cancer, we applied FISH to a tissue microarray containing 2317 bladder cancer samples. Presence of CMYC copy number increase was associated with advanced stage and high grade. CMYC amplifications were seen in 3 of 467 pTa (0.6%), 10 of 247 pT1 (4%) and 11 of 201 pT2-4 urothelial carcinomas (5.5%; p < 0.0001), as well as in 1 of 123 G1 (0.8%), 8 of 470 G2 (1.7%) and 17 of 365 G3 urothelial carcinomas (4.7%; p < 0.0001). CMYC gains were present in 49 of 467 pTa (10.5%), 39 of 247 pT1 (15.8%) and 43 of 201 pT2-4 urothelial carcinoma (21.4%; p < 0.0001), as well as in 7 of 123 G1 (5.7%), 56 of 470 G2 (11.9%) and 72 of 365 G3 urothelial carcinomas (19.7%; p < 0.0001). CMYC copy number changes were unrelated to prognosis of bladder cancer patients. We conclude that alterations of the CMYC gene, including copy number gains and amplifications, are linked to genetically unstable bladder cancers that are characterized by a high histologic grade and/or invasive growth. Patient prognosis was not affected by CMYC gene copy number changes.
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Affiliation(s)
- Boriana Zaharieva
- Department of Medical Genetics, Medical University of Sofia, Sofia, Bulgaria
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Moberg KH, Mukherjee A, Veraksa A, Artavanis-Tsakonas S, Hariharan IK. The Drosophila F Box Protein Archipelago Regulates dMyc Protein Levels In Vivo. Curr Biol 2004; 14:965-74. [PMID: 15182669 DOI: 10.1016/j.cub.2004.04.040] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2004] [Revised: 03/22/2004] [Accepted: 04/02/2004] [Indexed: 02/09/2023]
Abstract
BACKGROUND The Myc oncoprotein is an important regulator of cellular growth in metazoan organisms. Its levels and activity are tightly controlled in vivo by a variety of mechanisms. In normal cells, Myc protein is rapidly degraded, but the mechanism of its degradation is not well understood. RESULTS Here we present genetic and biochemical evidence that Archipelago (Ago), the F box component of an SCF-ubiquitin ligase and the Drosophila ortholog of a human tumor suppressor, negatively regulates the levels and activity of Drosophila Myc (dMyc) protein in vivo. Mutations in archipelago (ago) result in strongly elevated dMyc protein levels and increased tissue growth. Genetic interactions indicate that ago antagonizes dMyc function during development. Archipelago binds dMyc and regulates its stability, and the ability of Ago to bind dMyc in vitro correlates with its ability to inhibit dMyc accumulation in vivo. CONCLUSIONS Our data indicate that archipelago is an important inhibitor of dMyc in developing tissues. Because archipelago can also regulate Cyclin E levels and Notch activity, these results indicate how a single F box protein can be responsible for the degradation of key components of multiple pathways that control growth and cell cycle progression.
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Affiliation(s)
- Kenneth H Moberg
- Massachusetts General Hospital Cancer Center, Building 149, 13th Street, Charlestown, MA 02129 USA.
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Abba MC, Laguens RM, Dulout FN, Golijow CD. The c-myc activation in cervical carcinomas and HPV 16 infections. Mutat Res 2004; 557:151-8. [PMID: 14729369 DOI: 10.1016/j.mrgentox.2003.10.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Despite the prominent role for Human Papillomavirus (HPV) infection in the development of genital cancer, other genetic or environmental co-factors have also been involved. Studies of c-myc activation in cervical carcinomas have reported that gene over-expression (mainly gene amplification) are common in cervical squamous cell carcinomas and may correlate with the biologic behavior of the neoplasm. Using PCR based technology, DNAs from 79 normal cervical samples and 225 abnormal cervical tissue scrapes were analyzed for HPV detection and typing and for c-myc gene amplification. Significant differences were found between the different cyto/histology groups (P<0.0001) and also with HPV high-risk infected samples (P<0.0002). In this sense, we showed that the average c-myc copy number increased according to the histological grade of the lesion (OR=6.3, CI=2.1-18.8). Also, the results showed that the infection with HPV 16 was tightly associated with c-myc amplification (OR=10.6, CI=3.1-36). These results could indicate that oncogene amplification take place in pre-invasive stages of cervical disease and could cooperate not only in tumor progression but also in cell transformation. Moreover, the results strongly associate the c-myc gene amplification to the infection with the oncogenic HPV 16, showing that the pattern of virus infection and oncogene activation could be specific for different viral genotypes.
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Affiliation(s)
- Martín C Abba
- Centro de Investigaciones en Genética Básica y Aplicada (CIGEBA), Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, Calle 60 y 118 s/n, B1900AVW, La Plata, Argentina.
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Huang Z, Traugh JA, Bishop JM. Negative control of the Myc protein by the stress-responsive kinase Pak2. Mol Cell Biol 2004; 24:1582-94. [PMID: 14749374 PMCID: PMC344192 DOI: 10.1128/mcb.24.4.1582-1594.2004] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2003] [Revised: 10/08/2003] [Accepted: 11/11/2003] [Indexed: 12/25/2022] Open
Abstract
Pak2 is a serine/threonine kinase that participates in the cellular response to stress. Among the potential substrates for Pak2 is the protein Myc, encoded by the proto-oncogene MYC. Here we demonstrate that Pak2 phosphorylates Myc at three sites (T358, S373, and T400) and affects Myc functions both in vitro and in vivo. Phosphorylation at all three residues reduces the binding of Myc to DNA, either by blocking the requisite dimerization with Max (through phosphorylation at S373 and T400) or by interfering directly with binding to DNA (through phosphorylation at T358). Phosphorylation by Pak2 inhibits the ability of Myc to activate transcription, to sustain cellular proliferation, to transform NIH 3T3 cells in culture, and to elicit apoptosis on serum withdrawal. These results indicate that Pak2 is a negative regulator of Myc, suggest that inhibition of Myc plays a role in the cellular response to stress, and raise the possibility that Pak2 may be the product of a tumor suppressor gene.
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Affiliation(s)
- Zhongdong Huang
- The George Williams Hooper Foundation, University of California, San Francisco, California 94143-0552, USA.
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Kobayashi N, Saeki K, Yuo A. Granulocyte-macrophage colony-stimulating factor and interleukin-3 induce cell cycle progression through the synthesis of c-Myc protein by internal ribosome entry site-mediated translation via phosphatidylinositol 3-kinase pathway in human factor-dependent leukemic cells. Blood 2003; 102:3186-95. [PMID: 12855588 DOI: 10.1182/blood-2003-02-0567] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
To investigate the roles of c-myc during hematopoietic proliferation induced by growth factors, we used factor-dependent human leukemic cell lines (MO7e and F36P) in which proliferation, cell cycle progression, and c-Myc expression were strictly regulated by granulocyte-macrophage colony-stimulating factor (GM-CSF) and interleukin-3 (IL-3). In these cell lines, both c-myc mRNA and c-Myc protein stability were not affected by GM-CSF and IL-3, suggesting a regulation of c-Myc protein at the translational level. However, rapamycin, an inhibitor of cap-dependent translation, did not block c-myc induction by GM-CSF and IL-3. Thus, we studied the cap-independent translation, the internal ribosome entry site (IRES), during c-Myc protein synthesis using dicistronic reporter gene plasmids and found that GM-CSF and IL-3 activated c-myc IRES to initiate translation. c-myc IRES activation, c-Myc protein expression, and cell cycle progression were all blocked by a phosphatidylinositol 3-kinase (PI3K) inhibitor, LY294002. In another factor-dependent cell line, UT7, we observed the cell cycle progression and up-regulation of c-Myc protein, c-myc mRNA, and c-myc IRES simultaneously, which were all inhibited by LY294002. Results indicate that hematopoietic growth factors induce cell cycle progression via IRES-mediated translation of c-myc though the PI3K pathway in human factor-dependent leukemic cells.
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Affiliation(s)
- Norihiko Kobayashi
- Department of Hematology, Research Institute, International Medical Center of Japan, 1-21-1 Toyama, Shinjuku-ku, Tokyo 162-8655, Japan
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Li J, Kretzner L. The growth-inhibitory Ndrg1 gene is a Myc negative target in human neuroblastomas and other cell types with overexpressed N- or c-myc. Mol Cell Biochem 2003; 250:91-105. [PMID: 12962147 DOI: 10.1023/a:1024918328162] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A major prognostic marker for neuroblastoma (Nb) is N-myc gene amplification, which predicts a poor clinical outcome. We sought genes differentially expressed on a consistent basis between multiple human Nb cell lines bearing normal versus amplified N-myc, in hopes of finding target genes that might clarify how N-myc overexpression translates into poor clinical prognosis. Using differential display, we find the previously described growth-inhibitory gene Ndrg1 is strongly repressed in all tested Nb cell lines bearing N-myc amplification, as well as in a neuroepithelioma line with amplified c-myc. Overexpression of N-myc in non-amplified Nb cells leads to repression of Ndrg1, as does activation of an inducible c-myc transgene in fibroblasts. Conversely, N-myc downregulation in N-myc-amplified Nb cells results in re-expression of the Ndrg1, and stimuli known to induce Ndrg1 do so in Nb cells while simultaneously down-regulating N-myc. Relevant to these results, we demonstrate an in vitro interaction of Myc protein with the Ndrg1 core promoter. We also find that Ndrg1 levels increase dramatically during in vitro differentiation of two cell lines modeling neural and glial development, while c- and N-myc levels decline. Our results combined with previous information on the Ndrg1 gene product suggest that downregulation of this gene is an important component of N-Myc effects in neuroblastomas with poor clinical outcome. In support of this notion, we find that re-expression of Ndrg1 in high-Myc Nb cells results in smaller cells with reduced colony size in soft-agar assays, further underscoring the functional significance of this gene in human neuroblastoma cells.
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MESH Headings
- Agar/chemistry
- Agar/metabolism
- Biomarkers, Tumor
- Blotting, Northern
- Cell Cycle Proteins/genetics
- Cell Cycle Proteins/physiology
- Cell Differentiation
- Cell Division
- Cell Line, Tumor
- Cell Transformation, Neoplastic
- Cloning, Molecular
- Down-Regulation
- Gene Expression Profiling
- Glutathione Transferase/metabolism
- Humans
- Immunoblotting
- Intracellular Signaling Peptides and Proteins
- Neuroblastoma/metabolism
- Neuroectodermal Tumors, Primitive, Peripheral/metabolism
- Prognosis
- Promoter Regions, Genetic
- Protein Binding
- Proto-Oncogene Proteins c-myc/biosynthesis
- Proto-Oncogene Proteins c-myc/metabolism
- RNA, Messenger/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
- Ribonucleases/metabolism
- Sequence Analysis, DNA
- Time Factors
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Affiliation(s)
- Jun Li
- Department of Cellular and Molecular Biology, Division of Basic Biomedical Sciences, University of South Dakota School of Medicine, Vermillion, SD, USA
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Mahon BD, Wittke A, Weaver V, Cantorna MT. The targets of vitamin D depend on the differentiation and activation status of CD4 positive T cells. J Cell Biochem 2003; 89:922-32. [PMID: 12874827 DOI: 10.1002/jcb.10580] [Citation(s) in RCA: 310] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Vitamin D is a potent immune system regulator. The active form of vitamin D (1,25(OH)(2)D(3)) suppresses the development of animal models of human autoimmune diseases. 1,25(OH)(2)D(3) decreased the proliferation of all T helper (h) cells and decreased the production of IFN-gamma, IL-2, and IL-5. In Th2 cells 1,25(OH)(2)D(3) increased the production of IL-4. Quiescent CD4+ T cells express vitamin D receptors but only at a low level, which increased five-fold following activation. 1,25(OH)(2)D(3) treatment of Th0 cells, but not Th1 or Th2 cells, induced the expression of the transcription factor GATA-3. Microarray technology identified over 102 targets of 1,25(OH)(2)D(3) in CD4+ T cells. Of the 102 genes, 57 genes were down-regulated and 45 were up-regulated by 1,25(OH)(2)D(3) treatment of the CD4+ T cells. Two of the identified genes are regulators of NFkB. Other genes of interest included the IL-2Rbeta gene and IgE binding factor. Th2 and Th0 cells produced more IgE binding factor after treatment with 1,25(OH)(2)D(3) while Th1 cell IgE binding factor expression was unaffected by 1,25(OH)(2)D(3) addition. It is unclear why some of the genes identified are expressed in CD4+ T cells and furthermore why 1,25(OH)(2)D(3) regulates the expression of these genes. Clearly CD4+ T cells can be direct targets of vitamin D. The targets of vitamin D in CD4+ T cells depend on the state of activation and differentiation status of the cells.
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Affiliation(s)
- Brett D Mahon
- Department of Nutrition, The Pennsylvania State University, University Park, PA 16802, USA
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Fox EJ, Wright SC. The transcriptional repressor gene Mad3 is a novel target for regulation by E2F1. Biochem J 2003; 370:307-13. [PMID: 12444919 PMCID: PMC1223166 DOI: 10.1042/bj20021583] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2002] [Revised: 11/19/2002] [Accepted: 11/21/2002] [Indexed: 01/28/2023]
Abstract
Mad family proteins are transcriptional repressors that antagonize the activity of the c- Myc proto-oncogene product. Mad3 is expressed specifically during the S-phase of the cell cycle in both proliferating and differentiating cells, suggesting that its biological function is probably linked to processes that occur during this period. To determine the mechanisms that regulate the cell-cycle-specific transcription of Mad3, we used reporter gene assays in stably transfected fibroblasts. We show that the activation of Mad3 at the G1-S boundary is mediated by a single E2F (E2 promoter binding factor)-binding site within the 5'-flanking region of the gene. Mutation of this element eliminated transcriptional activation at S-phase, suggesting that the positively acting E2F proteins play a role in Mad3 regulation. Using electrophoretic mobility-shift assays and chromatin immunoprecipitation, we show that E2F1 binds to the Mad3 5'-flanking region both in vitro and in vivo. We thus identify Mad3 as a novel transcriptional target of E2F1.
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Affiliation(s)
- Elizabeth J Fox
- School of Biochemistry and Molecular Biology, University of Leeds, Mount Preston Street, Leeds LS2 9JT, UK
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Abstract
Modulation of gene expression using antisense oligonucleotides has advanced from the laboratory to the clinic. Numerous companies can, at least partially, attribute their success to the development of antisense techniques, and one antisense drug is currently on the market. Antisense compounds have been used in clinical trials that included patients with urologic tumors, mostly directed at proliferation- or apoptosis-related targets. Furthermore, therapeutic inhibition of many new identified genes is being investigated in preclinical tests. This review provides a contemporary overview of current preclinical and clinical antisense oligonucleotide concepts for the treatment of urologic tumors.
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Affiliation(s)
- Ingo Kausch
- Department of Urology, Medical University of Lübeck, Ratzeburger Allee 160, Germany
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41
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Delhommeau F, Thierry A, Feneux D, Lauret E, Leclercq E, Courtier MH, Sainteny F, Vainchenker W, Bennaceur-Griscelli A. Telomere dysfunction and telomerase reactivation in human leukemia cell lines after telomerase inhibition by the expression of a dominant-negative hTERT mutant. Oncogene 2002; 21:8262-71. [PMID: 12447689 DOI: 10.1038/sj.onc.1206054] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2002] [Revised: 09/13/2002] [Accepted: 09/17/2002] [Indexed: 11/08/2022]
Abstract
As activation of telomerase represents a key step in the malignant transformation process, experimental models to develop anti-telomerase drugs provide a rational basis for anticancer strategies. We analysed the short and long-term efficacy of a stably expressed dominant-negative mutant (DN) of the telomerase catalytic unit (hTERT) in UT-7 and U937 human leukemia cell lines by using an IRES-e-GFP retrovirus. As expected, telomerase inactivation resulted in drastic telomere shortening, cytogenetic instability and cell growth inhibition in all e-GFP positive DN clones after 15-35 days of culture. However, despite this initial response, 50% of e-GFP positive DN clones with short telomeres escaped from crisis after 35 days of culture and recovered a proliferation rate similar to the control cells. This rescue was associated with a telomerase reactivation inducing telomere lengthening. We identified two pathways, one involving the loss of the DN transgene expression and the other the transcriptional up-regulation of endogenous hTERT with persistence of the DN transgene expression. Although this second mechanism appears to be a very rare event (one clone), these findings suggest that genomic instability induced by short telomeres after telomerase inhibition might enhance the probability of activation or selection of telomere maintenance mechanisms dependent on hTERT transcription.
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Affiliation(s)
- François Delhommeau
- INSERM U362, PR-1, Institut Gustave Roussy, 39/53 rue Camille Desmoulins, 94805 Villejuif, France
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42
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Tsuneoka M, Koda Y, Soejima M, Teye K, Kimura H. A novel myc target gene, mina53, that is involved in cell proliferation. J Biol Chem 2002; 277:35450-9. [PMID: 12091391 DOI: 10.1074/jbc.m204458200] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Myc is a ubiquitous mediator of cell proliferation and can transactivate the expression of various genes through E-box sites. Here we report a novel gene, mina53 (Myc-induced nuclear antigen with a molecular mass of 53 kDa). The mina53 gene encodes a protein with a molecular weight of 53 kDa, which is localized in the nucleus and with part of the protein concentrated in the nucleolus. When serum-starved cells were activated by serum, the level of c-myc mRNA was elevated, and an increase in mina53 mRNA followed the elevation of c-myc mRNA. When expression of c-myc was reduced in human promyelocytic leukemia HL60 cells by phorbol 12-myristate 13-acetate, the expression of mina53 mRNA and protein was reduced. The expression of mina53 mRNA and Mina53 protein was induced by ectopic introduction of wild type c-Myc but not by a mutant c-Myc lacking the transactivation domain. When c-Myc in the c-MycER chimeric protein was activated, mina53 mRNA was increased, even in the presence of an inhibitor for protein synthesis. E-box sites are present in a region proximal to the transcription initiation sites of the mina53 gene. The gene expression from the mina53 promoter was elevated by c-Myc through E-box sites. c-Myc protein bound to the mina53 promoter region in vivo in HL60 cells in the proliferating phase but not after treatment of cells with phorbol 12-myristate 13-acetate. Specific inhibition of mina53 expression by an RNA interference method severely suppressed cell proliferation. Taken together, these results indicate that mina53 is a direct target gene of Myc, suggesting that mina53 is involved in mammalian cell proliferation.
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Affiliation(s)
- Makoto Tsuneoka
- Division of Human Genetics, Department of Forensic Medicine, Kurume University School of Medicine, Kurume 830-0011, Japan.
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Abstract
The telomere is a special functional complex at the end of linear eukaryotic chromosomes, consisting of tandem repeat DNA sequences and associated proteins. It is essential for maintaining the integrity and stability of linear eukaryotic genomes. Telomere length regulation and maintenance contribute to normal human cellular aging and human diseases. The synthesis of telomeres is mainly achieved by the cellular reverse transcriptase telomerase, an RNA-dependent DNA polymerase that adds telomeric DNA to telomeres. Expression of telomerase is usually required for cell immortalization and long-term tumor growth. In humans, telomerase activity is tightly regulated during development and oncogenesis. The modulation of telomerase activity may therefore have important implications in antiaging and anticancer therapy. This review describes the currently known components of the telomerase complex and attempts to provide an update on the molecular mechanisms of human telomerase regulation.
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Affiliation(s)
- Yu-Sheng Cong
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9039, USA.
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44
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Abstract
The activated product of the myc oncogene deregulates both cell growth and death check points and, in a permissive environment, rapidly accelerates the affected clone through the carcinogenic process. Advances in understanding the molecular mechanism of Myc action are highlighted in this review. With the revolutionary developments in molecular diagnostic technology, we have witnessed an unprecedented advance in detecting activated myc in its deregulated, oncogenic form in primary human cancers. These improvements provide new opportunities to appreciate the tumor subtypes harboring deregulated Myc expression, to identify the essential cooperating lesions, and to realize the therapeutic potential of targeting Myc. Knowledge of both the breadth and depth of the numerous biological activities controlled by Myc has also been an area of progress. Myc is a multifunctional protein that can regulate cell cycle, cell growth, differentiation, apoptosis, transformation, genomic instability, and angiogenesis. New insights into Myc's role in regulating these diverse activities are discussed. In addition, breakthroughs in understanding Myc as a regulator of gene transcription have revealed multiple mechanisms of Myc activation and repression of target genes. Moreover, the number of reported Myc regulated genes has expanded in the past few years, inspiring a need to focus on classifying and segregating bona fide targets. Finally, the identity of Myc-binding proteins has been difficult, yet has exploded in the past few years with a plethora of novel interactors. Their characterization and potential impact on Myc function are discussed. The rapidity and magnitude of recent progress in the Myc field strongly suggests that this marvelously complex molecule will soon be unmasked.
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Affiliation(s)
- Sara K Oster
- Division of Cellular and Molecular Biology, Ontario Cancer Institute, Princess Margaret Hospital, University of Toronto
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46
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Abstract
The clinical implications of understanding epidermal stem cell biology abound. Thousands of burns victims across the world have benefited from early research into the proliferation of epidermal keratinocytes in vitro. Advances now indicate there are a number of stem cell repositories within the epidermis, two of which, the interfollicular epidermis and the bulge region of the hair follicle, may supply each other when damaged. This review details the progress made in the identification and characterisation of stem cells within the epidermis and discusses the molecules involved in the epidermal stem cell's choice of fate. Finally, the skin, like bone marrow, could be a readily accessible source of stem cells for therapeutic intervention and evidence of skin stem cell plasticity is highlighted.
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Affiliation(s)
- Sam M Janes
- Imperial Cancer Research Fund, 44 Lincoln's Inn Fields, London WC2A 3PX, UK.
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48
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Yang H, Scholich K, Poser S, Storm DR, Patel TB, Goldowitz D. Developmental expression of PAM (protein associated with MYC) in the rodent brain. BRAIN RESEARCH. DEVELOPMENTAL BRAIN RESEARCH 2002; 136:35-42. [PMID: 12036515 DOI: 10.1016/s0165-3806(02)00311-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Recently, human protein associated with MYC, PAM, has been cloned and characterized as a large protein that interacts with the transcriptional-activating domain of Myc. The regional expression pattern of PAM in brains has not been yet been defined. Expression patterns of PAM in both rat and mouse brains were examined by using in situ hybridization. Here, we demonstrate that PAM mRNA is highly expressed in specific anatomical regions including hippocampus, dentate gyrus and cerebellum. In these areas, PAM mRNA is restricted to pyramidal cells of hippocampus and granule cells of dentate gyrus and cerebellum. During development, PAM mRNA expression is differentially regulated. It is turned on after birth and up-regulated during the first postnatal 2 weeks. Thereafter, PAM mRNA expression remains elevated into adulthood. The regional distribution of PAM in brain is similar to that observed for several adenylyl cyclase isoforms such as type I isoform. However, no obvious alterations of PAM mRNA expression are detected in brains of mice deficient in type I or type 8 or type 1 and type 8 isoforms of adenylyl cyclase. Thus, adenylyl cyclase does not appear to alter the expression of PAM.
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Affiliation(s)
- Huaitao Yang
- Department of Anatomy & Neurobiology, University of Tennessee Health Science Center, 855 Monroe Avenue, Memphis, TN 38163, USA
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49
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Cerni C, Skrzypek B, Popov N, Sasgary S, Schmidt G, Larsson LG, Lüscher B, Henriksson M. Repression of in vivo growth of Myc/Ras transformed tumor cells by Mad1. Oncogene 2002; 21:447-59. [PMID: 11821957 DOI: 10.1038/sj.onc.1205107] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2001] [Revised: 10/09/2001] [Accepted: 10/29/2001] [Indexed: 11/09/2022]
Abstract
The Myc/Max/Mad network of transcriptional regulatory proteins plays an essential role in cell proliferation, growth, apoptosis, and differentiation. Whereas Myc proteins affect cell cycle progression positively, Mad proteins are negative regulators of cell proliferation. It has been shown in several in vitro systems that Mad proteins antagonize c-Myc functions. In this report we describe the inhibition of tumor cell outgrowth in vivo by Mad1 expression. Transformed cell lines were generated by co-transfection of c-myc, c-H-ras, and a chimeric mad1ER construct into primary rat embryo cells (MRMad1ER cells). Activation of Mad1 by 4-Hydroxy-Tamoxifen (OHT) resulted in abrogation of telomerase activity, reduced cloning efficiency, and decreased proportion of cells in S phase. Injection of MRMad1ER cells into syngenic rats induced aggressively growing tumors after a short latency period. This tumor growth was inhibited by OHT-treatment of animals, with the extent of inhibition correlating with the amount of OHT injected. No effect of OHT on tumor growth was observed with similarly transformed Myc/Ras cell lines which did not express Mad1ER. These data demonstrate that Mad1 is able to suppress Myc/Ras-mediated transformation under in vivo conditions.
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MESH Headings
- Animals
- Basic Helix-Loop-Helix Leucine Zipper Transcription Factors
- Blotting, Western
- Cell Cycle Proteins/metabolism
- Cell Division/drug effects
- Cell Division/genetics
- Cell Line, Transformed
- Cell Transformation, Neoplastic/genetics
- Cell Transformation, Neoplastic/metabolism
- Cell Transformation, Neoplastic/pathology
- Cells, Cultured
- Flow Cytometry
- Gene Expression Regulation, Neoplastic
- Genes, myc/genetics
- Genes, ras/genetics
- Male
- Nuclear Proteins
- Phosphoproteins/genetics
- Phosphoproteins/metabolism
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Rats
- Rats, Inbred F344
- Repressor Proteins/genetics
- Repressor Proteins/metabolism
- Tamoxifen/analogs & derivatives
- Tamoxifen/pharmacology
- Telomerase/antagonists & inhibitors
- Telomerase/metabolism
- Transgenes/genetics
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Affiliation(s)
- Christa Cerni
- Institute of Cancer Research, University of Vienna, Borschkegasse 8a, A-1090 Wien, Austria.
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Qian J, Hirasawa K, Bostwick DG, Bergstralh EJ, Slezak JM, Anderl KL, Borell TJ, Lieber MM, Jenkins RB. Loss of p53 and c-myc overrepresentation in stage T(2-3)N(1-3)M(0) prostate cancer are potential markers for cancer progression. Mod Pathol 2002; 15:35-44. [PMID: 11796839 DOI: 10.1038/modpathol.3880487] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
To determine whether genetic changes are markers of cancer progression and patient survival in Stage T(2-3)N(1-3)M(0) prostatic carcinoma, we compared 26 patients who died of tumor relapse after prostatectomy and lymphadenectomy (case group) with 26 matched patients who were alive at the time of the matched case's death (control group). Nine unmatched cases were also included in this study. In 37 cases, paired primary tumors (119 foci) and lymph node metastases (114 foci) were available for study. Fluorescence in situ hybridization (FISH) with centromere-specific probes for chromosomes 7, 8, and 17 and region-specific probes for D7S486 (7q31), c-myc (8q24), LPL (8p22), and p53 (17p13) was performed on available primary carcinomas and lymph node metastases. In primary tumor foci, +7q31, -8p22, +c-myc, substantial additional increases of myc (AI-c-myc), and -p53 were observed in 65%, 74%, 43%, 29%, and 31% of foci, respectively. AI-c-myc was strongly associated with higher cancer Gleason score (P =.003). Heterogeneity of genetic changes was frequently observed among multiple cancer foci. Lymph node metastases of prostate cancer usually shared genetic changes with paired primary tumors. In addition, the genetic change pattern with -8p, +c-myc or AI-c-myc, +7q, and +p53 was slightly higher in lymph node metastases (22%) than in primary tumors (6%) (P =.08). In matched case and control patients, simultaneous gain of 7q31 (+7q31) and CEP7 (+CEP7) was identified in 59% and 68% of specimens for case and control groups, respectively (P =.48). Loss of 8p22 (-8p22) was identified in 77% and 69% of specimens for case and control groups, respectively (P = 1.0). Simultaneous gain of c-myc (+c-myc) and CEP8 (+CEP8) without overt additional increase of c-myc copy number relative to CEP8 copy number, was identified in 38% and 54% of specimens for case and control groups, respectively (P =.27). AI-c-myc was identified in 54% and 23% of specimens for case and control groups, respectively (odds ratio = 3.0, P =.06). Loss of p53 (-p53) was identified in 46% and 15% of specimens for case and control groups, respectively (odds ratio = 4.0, P =.04). Our results indicate that FISH anomalies are very common in both primary tumors and lymph node metastases of Stage T(2-3)N(1-3)M(0) prostate cancer; that AI-c-myc is associated with higher cancer Gleason score; that AI-c-myc and -p53 are associated with prostate cancer progression and are potential markers of survival in Stage T(2-3)N(1-3)M(0) prostate cancer; and that lymph node metastases usually have similar or additional genetic changes compared with primary tumors, and multiple lymph node metastases usually have similar genetic changes.
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Affiliation(s)
- Junqi Qian
- Department of Laboratory Medicine and Pathology, Section of Biostatistics, Mayo Clinic, 200 First Street SW, Rochester, Minnesota 55905, USA
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