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Murphy BM, Jensen DM, Arnold TE, Aguilar-Valenzuela R, Hughes J, Posada V, Nguyen KT, Chu VT, Tsai KY, Burd CJ, Burd CE. The OSUMMER lines: A series of ultraviolet-accelerated NRAS-mutant mouse melanoma cell lines syngeneic to C57BL/6. Pigment Cell Melanoma Res 2023; 36:365-377. [PMID: 37341054 DOI: 10.1111/pcmr.13107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 04/25/2023] [Accepted: 06/10/2023] [Indexed: 06/22/2023]
Abstract
An increasing number of cancer subtypes are treated with front-line immunotherapy. However, approaches to overcome primary and acquired resistance remain limited. Preclinical mouse models are often used to investigate resistance mechanisms, novel drug combinations, and delivery methods; yet most of these models lack the genetic diversity and mutational patterns observed in human tumors. Here we describe a series of 13 C57BL/6J melanoma cell lines to address this gap in the field. The Ohio State University-Moffitt Melanoma Exposed to Radiation (OSUMMER) cell lines are derived from mice expressing endogenous, melanocyte-specific, and clinically relevant Nras driver mutations (Q61R, Q61K, or Q61L). Exposure of these animals to a single, non-burning dose of ultraviolet B accelerates the onset of spontaneous melanomas with mutational patterns akin to human disease. Furthermore, in vivo irradiation selects against potent tumor antigens, which could prevent the outgrowth of syngeneic cell transfers. Each OSUMMER cell line possesses distinct in vitro growth properties, trametinib sensitivity, mutational signatures, and predicted antigenicity. Analysis of OSUMMER allografts shows a correlation between strong, predicted antigenicity and poor tumor outgrowth. These data suggest that the OSUMMER lines will be a valuable tool for modeling the heterogeneous responses of human melanomas to targeted and immune-based therapies.
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Affiliation(s)
- Brandon M Murphy
- Department of Cancer Biology and Genetics, The Ohio State University, Columbus, Ohio, USA
| | - Daelin M Jensen
- Department of Cancer Biology and Genetics, The Ohio State University, Columbus, Ohio, USA
| | - Tiffany E Arnold
- Department of Cancer Biology and Genetics, The Ohio State University, Columbus, Ohio, USA
- Department of Molecular Genetics, The Ohio State University, Columbus, Ohio, USA
| | - Renan Aguilar-Valenzuela
- Department of Cancer Biology and Genetics, The Ohio State University, Columbus, Ohio, USA
- Department of Molecular Genetics, The Ohio State University, Columbus, Ohio, USA
| | - Jase Hughes
- EMD Millipore Corporation, Temecula, California, USA
| | - Valentina Posada
- Department of Molecular Genetics, The Ohio State University, Columbus, Ohio, USA
| | - Kimberly T Nguyen
- Center for Genomic and Precision Medicine, Texas A&M Institute of Biosciences and Technology, Houston, Texas, USA
| | - Vi T Chu
- EMD Millipore Corporation, Temecula, California, USA
| | - Kenneth Y Tsai
- Departments of Pathology and Tumor Biology, The H. Lee Moffitt Cancer Center & Research Institute, Tampa, Florida, USA
| | - Craig J Burd
- Department of Molecular Genetics, The Ohio State University, Columbus, Ohio, USA
| | - Christin E Burd
- Department of Cancer Biology and Genetics, The Ohio State University, Columbus, Ohio, USA
- Department of Molecular Genetics, The Ohio State University, Columbus, Ohio, USA
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Destro G, Chen Z, Chan CY, Fraser C, Dias G, Mosley M, Guibbal F, Gouverneur V, Cornelissen B. A radioiodinated rucaparib analogue as an Auger electron emitter for cancer therapy. Nucl Med Biol 2023; 116-117:108312. [PMID: 36621256 DOI: 10.1016/j.nucmedbio.2022.108312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 12/21/2022] [Accepted: 12/22/2022] [Indexed: 12/29/2022]
Abstract
INTRODUCTION Radioligand therapy (RLT) is an expanding field that has shown great potential in the fight against cancer. Radionuclides that can be carried by selective ligands such as antibodies, peptides, and small molecules targeting cancerous cells have demonstrated a clear improvement in the move towards precision medicine. Poly (ADP-ribose) polymerase (PARP) is a family of enzymes involved in DNA damage repair signalling pathway, with PARP inhibitors olaparib, talazoparib, niraparib, veliparib, and rucaparib having FDA approval for cancer therapy in routine clinical use. Based on our previous work with the radiolabelled PARP inhibitor [18F]rucaparib, we replaced the fluorine-18 moiety, used for PET imaging, with iodine-123, a radionuclide used for SPECT imaging and Auger electron therapy, resulting in 8-[123I]iodo-5-(4-((methylamino)methyl)phenyl)-2,3,4,6-tetrahydro-1H-azepino[5,4,3-cd]indol-1-one, ([123I]GD1), as a potential radiopharmaceutical for RLT. METHODS [123I]GD1 was synthesized via copper-mediated radioiodination from a selected boronic esters precursor. In vitro uptake, retention, blocking, and effects on clonogenic survival with [123I]GD1 treatment were tested in a panel of cancer cell lines. Enzymatic inhibition of PARP by GD1 was also tested in a cell-free system. The biodistribution of [123I]GD1 was investigated by SPECT/CT in mice following intravenous administration. RESULTS Cell-free enzymatic inhibition and in vitro blocking experiments confirmed a modest ability of GD1 to inhibit PARP-1, IC50 = 239 nM. In vitro uptake of [123I]GD1 in different cell lines was dose dependent, and radiolabelled compound was retained in cells for >2 h. Significantly reduced clonogenic survival was observed in vitro after exposure of cells for 1 h with as low as 50 kBq of [123I]GD1. The biodistribution of [123I]GD1 was further characterized in vivo showing both renal and hepatobiliary clearance pathways with a biphasic blood clearance. CONCLUSION We present the development of a new theragnostic agent based on the rucaparib scaffold and its evaluation in in vitro and in vivo models. The data reported show that [123I]GD1 may have potential to be used as a theragnostic agent.
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Affiliation(s)
- Gianluca Destro
- Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, OX3 7DQ Oxford, UK; Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Zijun Chen
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
| | - Chung Ying Chan
- Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, OX3 7DQ Oxford, UK
| | - Claudia Fraser
- Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, OX3 7DQ Oxford, UK
| | - Gemma Dias
- Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, OX3 7DQ Oxford, UK
| | - Michael Mosley
- Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, OX3 7DQ Oxford, UK
| | - Florian Guibbal
- Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, OX3 7DQ Oxford, UK
| | - Veronique Gouverneur
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
| | - Bart Cornelissen
- Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Old Road Campus Research Building, Off Roosevelt Drive, OX3 7DQ Oxford, UK; Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.
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Aepler J, Wodtke J, Wodtke R, Haase-Kohn C, Löser R, Pietzsch J, Hauser S. The Role of Transglutaminase 2 in the Radioresistance of Melanoma Cells. Cells 2022; 11:cells11081342. [PMID: 35456021 PMCID: PMC9027323 DOI: 10.3390/cells11081342] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 04/12/2022] [Indexed: 12/04/2022] Open
Abstract
Transglutaminase 2 (TG2) is a protein expressed in many tissues that exerts numerous, sometimes contradictory, intra- and extracellular functions, under both physiological and pathophysiological conditions. In the context of tumor progression, it has been found to be involved in cell adhesion, DNA repair mechanisms, induction of apoptosis, and mesenchymal transdifferentiation, among others. Here, we hypothesized that TG2 also contributes to the radioresistance of two human melanoma cell lines, A375 and MeWo, which can be seen to differ in their basal TG2 biosynthesis by examining their proliferation and clonal expansion after irradiation. For this purpose, cellular TG2 biosynthesis and TG2 activity were modulated by transfection-induced overexpression or TG2 knock-out and application of TG2-selective inhibitors. Proliferation and clonal expansion of TG2-overexpressing cells was not enhanced over wildtype cells, suggesting that increased TG2 biosynthesis does not further enhance the radioresistance of melanoma cells. Conversely, TG2 knock-out in A375 cells reduced their proliferation, as well as clonal and spheroidal expansion after irradiation, which indicates a contribution of TG2 to the radioresistance of melanoma cells. Since TG1, TG3, and partly also, TG6 biosynthesis was detectable in A375 and MeWo cells, it can be assumed that these other members of the TG family may exert a partially compensatory effect.
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Affiliation(s)
- Julia Aepler
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Bautzner Landstrasse 400, 01328 Dresden, Germany; (J.A.); (J.W.); (R.W.); (C.H.-K.); (R.L.); (J.P.)
- School of Sciences, Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Mommsenstrasse 4, 01307 Dresden, Germany
| | - Johanna Wodtke
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Bautzner Landstrasse 400, 01328 Dresden, Germany; (J.A.); (J.W.); (R.W.); (C.H.-K.); (R.L.); (J.P.)
| | - Robert Wodtke
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Bautzner Landstrasse 400, 01328 Dresden, Germany; (J.A.); (J.W.); (R.W.); (C.H.-K.); (R.L.); (J.P.)
| | - Cathleen Haase-Kohn
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Bautzner Landstrasse 400, 01328 Dresden, Germany; (J.A.); (J.W.); (R.W.); (C.H.-K.); (R.L.); (J.P.)
| | - Reik Löser
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Bautzner Landstrasse 400, 01328 Dresden, Germany; (J.A.); (J.W.); (R.W.); (C.H.-K.); (R.L.); (J.P.)
- School of Sciences, Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Mommsenstrasse 4, 01307 Dresden, Germany
| | - Jens Pietzsch
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Bautzner Landstrasse 400, 01328 Dresden, Germany; (J.A.); (J.W.); (R.W.); (C.H.-K.); (R.L.); (J.P.)
- School of Sciences, Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Mommsenstrasse 4, 01307 Dresden, Germany
| | - Sandra Hauser
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiopharmaceutical Cancer Research, Bautzner Landstrasse 400, 01328 Dresden, Germany; (J.A.); (J.W.); (R.W.); (C.H.-K.); (R.L.); (J.P.)
- Correspondence:
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Abstract
BACKGROUND Radiotherapy is the main treatment for nasopharyngeal carcinoma. The radioresistance mechanism of cells is related to miRNAs. OBJECTIVES To investigate the miRNA profiling of HONE1 and CNE2 after X-ray therapy. MATERIAL AND METHODS The HONE1 and CNE2 cells were treated with X-ray at 4 Gy, 8 Gy, 16 Gy, and 20 Gy doses. The cell lines CNE2 with the best therapy effects and HONE1 with the worst therapy effects were screened out. Apoptosis and cell viability were detected with flow cytometry and Cell Counting Kit-8 (CCK-8). High-throughput sequencing was performed. A miRNA library was constructed. The miRNA annotation expression distribution, family prediction and target gene interaction, Gene Ontology and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis were conducted. RESULTS The 24-hour 20 Gy dose X-rays were selected as the optimal therapy conditions. The CNE2_C, CNE2_M, HONE1_C and HONE1_M miRNAs accounted for 26.5%, 31.7%, 21.3%, and 22.9% of the Cleandata reads count, respectively, and the contents of rRNAs accounted for 24.9%, 14.7%, 25.1%, and 25.1% of the Cleandata reads count, respectively. The miRNAs with differential expression between the HONE1 and CNE2 cell lines including hsa-miR-21-5p, hsa-let-7a-5p, hsa-miR-125a-5p, hsa-miR-26a-5p, hsa-let-7f-5p, hsa-miR-20a-5p, and hsa-miR-24a-3p. There were also differentially expressed miRNAs in HONE1_C vs. HONE1_M, such as hsa-miR-21-5p and hsa-let-7i-5p. The differentially expressed miRNA in CNE2_C vs. CNE2_M was hsa-miR-148b-3p. The Gene Ontology analysis showed that the differentially expressed miRNA interacting genes in HONE1_M vs. CNE2_M were mainly enriched in biological process such as negative and positive regulation of transcription from RNA polymerase II promoter, cellular component such as cytosol and molecular function such as protein binding factor. The KEGG pathway analysis revealed that the differentially expressed miRNA interacting genes in HONE1_M vs. CNE2_M were enriched in the cancer-related pathways, such as pathways in cancer, MAPK signaling pathway and Wnt signaling pathway. CONCLUSIONS Twelve miRNAs and 9 genes which contribute to X-ray radiation resistance were identified. Among those with differential expression between the HONE1 and CNE2 cell lines, which played a regulatory role in multiple pathways, were hsa-miR-20a-5p, hsa-let-7a-5p, hsa-let-7f5p, hsa-let-7i-5p, hsa-miR-30e-5p, hsa-miR-148b-3p, and hsa-miR-200c-3p. The corresponding genes were MAPK1, SOS1, TGFBR1, TGFBR2, TP53, CASP3, CCNE2, PTEN, and CDK2.
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Affiliation(s)
- Hui Luo
- Department of Oncology, The First Affiliated Hospital of Nanchang University, China
| | - Fangyan Zhong
- Department of Oncology, The First Affiliated Hospital of Nanchang University, China
| | - Xiang Jing
- Department of Oncology, Jiangxi Lushan People's Hospital, Jiujiang, China
| | - Hong Lin
- Department of Oncology, The First Affiliated Hospital of Nanchang University, China
| | - Yong Li
- Department of Oncology, The First Affiliated Hospital of Nanchang University, China
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Siblini Y, Chéry C, Rouyer P, Raso J, Julien A, Hergalant S, François A, Bezdetnaya L, Vogin G, Guéant JL, Oussalah A. Ionizing radiations induce shared epigenomic signatures unraveling adaptive mechanisms of cancerous cell lines with or without methionine dependency. Clin Epigenetics 2021; 13:212. [PMID: 34852845 PMCID: PMC8638416 DOI: 10.1186/s13148-021-01199-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 11/12/2021] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Although radiation therapy represents a core cancer treatment modality, its efficacy is hampered by radioresistance. The effect of ionizing radiations (IRs) is well known regarding their ability to induce genetic alterations; however, their impact on the epigenome landscape in cancer, notably at the CpG dinucleotide resolution, remains to be further deciphered. In addition, no evidence is available regarding the effect of IRs on the DNA methylome profile according to the methionine dependency phenotype, which represents a hallmark of metabolic adaptation in cancer. METHODS We used a case-control study design with a fractionated irradiation regimen on four cancerous cell lines representative of HCC (HepG2), melanoma (MeWo and MeWo-LC1, which exhibit opposed methionine dependency phenotypes), and glioblastoma (U251). We performed high-resolution genome-wide DNA methylome profiling using the MethylationEPIC BeadChip on baseline conditions, irradiated cell lines (cumulative dose of 10 Gy), and non-irradiated counterparts. We performed epigenome-wide association studies to assess the effect of IRs and methionine-dependency-oriented analysis by carrying out epigenome-wide conditional logistic regression. We looked for epigenome signatures at the locus and single-probe (CpG dinucleotide) levels and through enrichment analyses of gene ontologies (GO). The EpiMet project was registered under the ID#AAP-BMS_003_211. RESULTS EWASs revealed shared GO annotation pathways associated with increased methylation signatures for several biological processes in response to IRs, including blood circulation, plasma membrane-bounded cell projection organization, cell projection organization, multicellular organismal process, developmental process, and animal organ morphogenesis. Epigenome-wide conditional logistic regression analysis on the methionine dependency phenotype highlighted several epigenome signatures related to cell cycle and division and responses to IR and ultraviolet light. CONCLUSIONS IRs generated a variation in the methylation level of a high number of CpG probes with shared biological pathways, including those associated with cell cycle and division, responses to IRs, sustained angiogenesis, tissue invasion, and metastasis. These results provide insight on shared adaptive mechanisms of the epigenome in cancerous cell lines in response to IR. Future experiments should focus on the tryptic association between IRs, the initiation of a radioresistance phenotype, and their interaction with methionine dependency as a hallmark of metabolic adaptation in cancer.
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Affiliation(s)
- Youssef Siblini
- INSERM, UMR_S1256, NGERE (Nutrition, Genetics, and Environmental Risk Exposure), Faculty of Medicine of Nancy, University of Lorraine, 9 Avenue de la Forêt de Haye, 54000, Vandoeuvre-lès-Nancy, Nancy, France
| | - Céline Chéry
- INSERM, UMR_S1256, NGERE (Nutrition, Genetics, and Environmental Risk Exposure), Faculty of Medicine of Nancy, University of Lorraine, 9 Avenue de la Forêt de Haye, 54000, Vandoeuvre-lès-Nancy, Nancy, France
- Department of Molecular Medicine and Personalized Therapeutics, Department of Biochemistry, Molecular Biology, Nutrition, and Metabolism, University Hospital of Nancy, 54000, Vandoeuvre-lès-Nancy, France
- Reference Center for Inborn Errors of Metabolism (ORPHA67872), University Hospital of Nancy, 54000, Vandoeuvre-lès-Nancy, France
| | - Pierre Rouyer
- INSERM, UMR_S1256, NGERE (Nutrition, Genetics, and Environmental Risk Exposure), Faculty of Medicine of Nancy, University of Lorraine, 9 Avenue de la Forêt de Haye, 54000, Vandoeuvre-lès-Nancy, Nancy, France
| | - Jérémie Raso
- INSERM, UMR_S1256, NGERE (Nutrition, Genetics, and Environmental Risk Exposure), Faculty of Medicine of Nancy, University of Lorraine, 9 Avenue de la Forêt de Haye, 54000, Vandoeuvre-lès-Nancy, Nancy, France
| | - Amélia Julien
- INSERM, UMR_S1256, NGERE (Nutrition, Genetics, and Environmental Risk Exposure), Faculty of Medicine of Nancy, University of Lorraine, 9 Avenue de la Forêt de Haye, 54000, Vandoeuvre-lès-Nancy, Nancy, France
| | - Sébastien Hergalant
- INSERM, UMR_S1256, NGERE (Nutrition, Genetics, and Environmental Risk Exposure), Faculty of Medicine of Nancy, University of Lorraine, 9 Avenue de la Forêt de Haye, 54000, Vandoeuvre-lès-Nancy, Nancy, France
| | | | - Lina Bezdetnaya
- Lorraine Institute of Oncology, 54000, Nancy, France
- CNRS, UMR_7039, CRAN (Centre de Recherche en Automatique de Nancy), Faculty of Medicine of Nancy, University of Lorraine, 54000, Vandoeuvre-lès-Nancy, France
| | - Guillaume Vogin
- UMR_7365, IMoPA (Ingénierie Moléculaire Et Ingénierie Articulaire), Faculty of Medicine of Nancy, CNRS-UL, University of Lorraine, 54000, Vandoeuvre-lès-Nancy, France
| | - Jean-Louis Guéant
- INSERM, UMR_S1256, NGERE (Nutrition, Genetics, and Environmental Risk Exposure), Faculty of Medicine of Nancy, University of Lorraine, 9 Avenue de la Forêt de Haye, 54000, Vandoeuvre-lès-Nancy, Nancy, France.
- Department of Molecular Medicine and Personalized Therapeutics, Department of Biochemistry, Molecular Biology, Nutrition, and Metabolism, University Hospital of Nancy, 54000, Vandoeuvre-lès-Nancy, France.
- Reference Center for Inborn Errors of Metabolism (ORPHA67872), University Hospital of Nancy, 54000, Vandoeuvre-lès-Nancy, France.
| | - Abderrahim Oussalah
- INSERM, UMR_S1256, NGERE (Nutrition, Genetics, and Environmental Risk Exposure), Faculty of Medicine of Nancy, University of Lorraine, 9 Avenue de la Forêt de Haye, 54000, Vandoeuvre-lès-Nancy, Nancy, France.
- Department of Molecular Medicine and Personalized Therapeutics, Department of Biochemistry, Molecular Biology, Nutrition, and Metabolism, University Hospital of Nancy, 54000, Vandoeuvre-lès-Nancy, France.
- Reference Center for Inborn Errors of Metabolism (ORPHA67872), University Hospital of Nancy, 54000, Vandoeuvre-lès-Nancy, France.
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Nakamura K, Karmokar A, Farrington PM, James NH, Ramos-Montoya A, Bickerton SJ, Hughes GD, Illidge TM, Cadogan EB, Davies BR, Dovedi SJ, Valge-Archer V. Inhibition of DNA-PK with AZD7648 Sensitizes Tumor Cells to Radiotherapy and Induces Type I IFN-Dependent Durable Tumor Control. Clin Cancer Res 2021; 27:4353-4366. [PMID: 34011558 PMCID: PMC9401489 DOI: 10.1158/1078-0432.ccr-20-3701] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 03/12/2021] [Accepted: 05/14/2021] [Indexed: 01/07/2023]
Abstract
PURPOSE Combining radiotherapy (RT) with DNA damage response inhibitors may lead to increased tumor cell death through radiosensitization. DNA-dependent protein kinase (DNA-PK) plays an important role in DNA double-strand break repair via the nonhomologous end joining (NHEJ) pathway. We hypothesized that in addition to a radiosensitizing effect from the combination of RT with AZD7648, a potent and specific inhibitor of DNA-PK, combination therapy may also lead to modulation of an anticancer immune response. EXPERIMENTAL DESIGN AZD7648 and RT efficacy, as monotherapy and in combination, was investigated in fully immunocompetent mice in MC38, CT26, and B16-F10 models. Immunologic consequences were analyzed by gene expression and flow-cytometric analysis. RESULTS AZD7648, when delivered in combination with RT, induced complete tumor regressions in a significant proportion of mice. The antitumor efficacy was dependent on the presence of CD8+ T cells but independent of NK cells. Analysis of the tumor microenvironment revealed a reduction in T-cell PD-1 expression, increased NK-cell granzyme B expression, and elevated type I IFN signaling in mice treated with the combination when compared with RT treatment alone. Blocking of the type I IFN receptor in vivo also demonstrated a critical role for type I IFN in tumor growth control following combined therapy. Finally, this combination was able to generate tumor antigen-specific immunologic memory capable of suppressing tumor growth following rechallenge. CONCLUSIONS Blocking the NHEJ DNA repair pathway with AZD7648 in combination with RT leads to durable immune-mediated tumor control.
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Affiliation(s)
- Kyoko Nakamura
- Bioscience, Early Oncology, Oncology R&D, AstraZeneca, Alderley Park, Macclesfield, United Kingdom
| | - Ankur Karmokar
- Bioscience, Early Oncology, Oncology R&D, AstraZeneca, Alderley Park, Macclesfield, United Kingdom
| | - Paul M Farrington
- Bioscience, Early Oncology, Oncology R&D, AstraZeneca, Alderley Park, Macclesfield, United Kingdom
| | - Neil H James
- Bioscience, Early Oncology, Oncology R&D, AstraZeneca, Alderley Park, Macclesfield, United Kingdom
| | | | - Susan J Bickerton
- Bioscience, Early Oncology, Oncology R&D, AstraZeneca, Alderley Park, Macclesfield, United Kingdom
| | - Gareth D Hughes
- Bioscience, Early Oncology, Oncology R&D, AstraZeneca, Cambridge, United Kingdom
| | - Timothy M Illidge
- Targeted Therapy Group, Division of Cancer Sciences, University of Manchester, Christie Hospital, Manchester NIHR Biomedical Research Centre, Manchester, United Kingdom
| | - Elaine B Cadogan
- Bioscience, Early Oncology, Oncology R&D, AstraZeneca, Cambridge, United Kingdom
| | - Barry R Davies
- Bioscience, Early Oncology, Oncology R&D, AstraZeneca, Cambridge, United Kingdom
| | - Simon J Dovedi
- Bioscience, Early Oncology, Oncology R&D, AstraZeneca, Cambridge, United Kingdom.
| | - Viia Valge-Archer
- Bioscience, Early Oncology, Oncology R&D, AstraZeneca, Cambridge, United Kingdom
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Górski R, Nowak-Terpiłowska A, Śledziński P, Baranowski M, Wosiński S. Morphological and cytophysiological changes in selected lines of normal and cancer human cells under the influence of a radio-frequency electromagnetic field. Ann Agric Environ Med 2021; 28:163-171. [PMID: 33775083 DOI: 10.26444/aaem/118260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
INTRODUCTION Currently, mobile phones and Wi-Fi are the most commonly used forms of telecommunication. The popularity of mobile telecommunications has made it necessary to investigate the problem more comprehensively and cautiously assess the possible risks, because never before in history has such a substantial proportion of the population been exposed to microwaves at comparably high levels. Some studies indicate that the high frequency electromagnetic radiation emitted by mobile phone and Wi-Fi connections can have a negative effect on human health, and can cause cancer. OBJECTIVE The aim of the study was to investigate the influence of the radiofrquency electromagnetic field (RF-EMF) on the metaboloc activity and morphology of normal human cells (fibroblasts) and cancer cells (prostate cancer cells). MATERIAL AND METHODS The cell cultures (human fibroblasts and prostate cancer cells) were exposed to RF-EMF at the frequency of 2.5 GHz for 24, 48 and 72h. To quantify changes in cell viability, the Cell Counting Kit - 8 was used. RESULTS It was found that the RF electromagnetic field exposure caused a significant decrease in the viability of fibroblasts, and a significant increase in cancer cells. Morphological analysis did not show significant changes in both cell lines after exposure to RF-EMF. CONCLUSIONS On the basis of the obtained results, the hypothesis can be formulated that a high frequency electromagnetic field can have harmful effects on human cells.
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Petragnano F, Pietrantoni I, Camero S, Codenotti S, Milazzo L, Vulcano F, Macioce G, Giordani I, Tini P, Cheleschi S, Gravina GL, Festuccia C, Rossetti A, Delle Monache S, Ordinelli A, Ciccarelli C, Mauro A, Barbara B, Antinozzi C, Schiavetti A, Maggio R, Di Luigi L, Polimeni A, Marchese C, Tombolini V, Fanzani A, Bernabò N, Megiorni F, Marampon F. Clinically relevant radioresistant rhabdomyosarcoma cell lines: functional, molecular and immune-related characterization. J Biomed Sci 2020; 27:90. [PMID: 32854690 PMCID: PMC7453562 DOI: 10.1186/s12929-020-00683-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 08/24/2020] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND The probability of local tumor control after radiotherapy (RT) remains still miserably poor in pediatric rhabdomyosarcoma (RMS). Thus, understanding the molecular mechanisms responsible of tumor relapse is essential to identify personalized RT-based strategies. Contrary to what has been done so far, a correct characterization of cellular radioresistance should be performed comparing radioresistant and radiosensitive cells with the same isogenic background. METHODS Clinically relevant radioresistant (RR) embryonal (RD) and alveolar (RH30) RMS cell lines have been developed by irradiating them with clinical-like hypo-fractionated schedule. RMS-RR cells were compared to parental isogenic counterpart (RMS-PR) and studied following the radiobiological concept of the "6Rs", which stand for repair, redistribution, repopulation, reoxygenation, intrinsic radioresistance and radio-immuno-biology. RESULTS RMS-RR cell lines, characterized by a more aggressive and in vitro pro-metastatic phenotype, showed a higher ability to i) detoxify from reactive oxygen species; ii) repair DNA damage by differently activating non-homologous end joining and homologous recombination pathways; iii) counteract RT-induced G2/M cell cycle arrest by re-starting growth and repopulating after irradiation; iv) express cancer stem-like profile. Bioinformatic analyses, performed to assess the role of 41 cytokines after RT exposure and their network interactions, suggested TGF-β, MIF, CCL2, CXCL5, CXCL8 and CXCL12 as master regulators of cancer immune escape in RMS tumors. CONCLUSIONS These results suggest that RMS could sustain intrinsic and acquire radioresistance by different mechanisms and indicate potential targets for future combined radiosensitizing strategies.
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Affiliation(s)
- Francesco Petragnano
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy
| | - Ilaria Pietrantoni
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy
| | - Simona Camero
- Department of Maternal, Infantile, and Urological Sciences, "Sapienza" University of Rome, Rome, Italy
| | - Silvia Codenotti
- Department of Molecular and Translational Medicine, Division of Biotechnology, University of Brescia, Brescia, Italy
| | - Luisa Milazzo
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Viale Regina Elena, Rome, Italy
| | - Francesca Vulcano
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Viale Regina Elena, Rome, Italy
| | - Giampiero Macioce
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Viale Regina Elena, Rome, Italy
| | - Ilenia Giordani
- Department of Anatomy, Histology, Forensic Medicine and Orthopedics, Section of Histology and Medical Embryology, "Sapienza" University, Rome, Italy
| | - Paolo Tini
- Sbarro Health Research Organization, Temple University, Philadelphia, PA, USA
- Unit of Radiation Oncology, University Hospital of Siena, Siena, Italy
| | - Sara Cheleschi
- Department of Medicine, Surgery and Neuroscience, Rheumatology Unit, University of Siena, Policlinico Le Scotte, Siena, Italy
| | - Giovanni Luca Gravina
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy
| | - Claudio Festuccia
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy
| | - Alessandra Rossetti
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy
| | - Simona Delle Monache
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy
| | - Alessandra Ordinelli
- Faculty of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Teramo, Italy
| | - Carmela Ciccarelli
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy
| | - Annunziata Mauro
- Faculty of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Teramo, Italy
| | - Barboni Barbara
- Faculty of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Teramo, Italy
| | - Cristina Antinozzi
- Unit of Endocrinology, Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", Rome, Italy
| | - Amalia Schiavetti
- Department of Maternal, Infantile, and Urological Sciences, "Sapienza" University of Rome, Rome, Italy
| | - Roberto Maggio
- Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila, L'Aquila, Italy
| | - Luigi Di Luigi
- Unit of Endocrinology, Department of Movement, Human and Health Sciences, University of Rome "Foro Italico", Rome, Italy
| | - Antonella Polimeni
- Department of Oral and Maxillo-Facial Sciences, Sapienza University of Rome, Rome, Italy
| | - Cinzia Marchese
- Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - Vincenzo Tombolini
- Department of Radiotherapy, Policlinico Umberto I, "Sapienza" University of Rome, Rome, Italy
| | - Alessandro Fanzani
- Department of Molecular and Translational Medicine, Division of Biotechnology, University of Brescia, Brescia, Italy
| | - Nicola Bernabò
- Faculty of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Teramo, Italy
| | - Francesca Megiorni
- Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - Francesco Marampon
- Department of Radiotherapy, Policlinico Umberto I, "Sapienza" University of Rome, Rome, Italy.
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Pathikonda S, Cheng SH, Yu KN. Role of PARP1 regulation in radiation-induced rescue effect. J Radiat Res 2020; 61:352-367. [PMID: 32329510 PMCID: PMC7299272 DOI: 10.1093/jrr/rraa023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 02/14/2020] [Accepted: 03/20/2020] [Indexed: 05/04/2023]
Abstract
Radiation-induced rescue effect (RIRE) in cells refers to the phenomenon where irradiated cells (IRCs) receive help from feedback signals produced by partnered bystander unirradiated cells (UIRCs) or from the conditioned medium (CM) that has previously conditioned the UIRCs. In the present work, we explored the role of poly (ADP-ribose) polymerase 1 (PARP1) regulation in RIRE and the positive feedback loop between PARP1 and nuclear factor-kappa-light-chain-enhancer of activated B cell (NF-κB) in RIRE using various cell lines, including HeLa, MCF7, CNE-2 and HCT116 cells. We first found that when the IRCs (irradiated with 2 Gy X-ray) were treated with CM, the relative mRNA expression levels of both tumor suppressor p53-binding protein 1 (53BP1) and PARP1, the co-localization factor between 53BP1 and γH2AX as well as the fluorescent intensity of PARP1 were reduced. We also found that IRCs treated with the PARP1 inhibitor, Olaparib (AZD2281) had a higher 53BP1 expression. These results illustrated that PARP1 was involved in RIRE transcriptionally and translationally. We further revealed that treatment of IRCs with CM together with Olaparib led to significantly lower mRNA expression levels and fluorescent intensities of NF-κB, while treatment of IRCs with CM together the NF-κB inhibitor BAY-11-7082 led to significantly lower mRNA expression levels as well as fluorescent intensities of PARP1. These results illustrated that PARP1 and NF-κB were involved in the positive feedback loop transcriptionally and translationally. Thus, the results supported the occurrence of a PARP1-NF-κB positive feedback loop in RIRE. The present work provided insights into potential exploitation of inhibition of PARP1 and/or the PARP1-NF-κB positive feedback loop in designing adjuncts to cancer radiotherapeutics.
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Affiliation(s)
- Spoorthy Pathikonda
- Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong
| | - Shuk Han Cheng
- Department of Biomedical Science, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong
| | - Kwan Ngok Yu
- Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong
- State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong
- Corresponding author. Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong. Tel: (852)-344-27812; Fax: (852)-344-20538;
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10
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Kim SD, Baik JS, Lee JH, Mun SW, Yi JM, Park MT. The malignancy of liver cancer cells is increased by IL-4/ERK/AKT signaling axis activity triggered by irradiated endothelial cells. J Radiat Res 2020; 61:376-387. [PMID: 32100006 PMCID: PMC7299255 DOI: 10.1093/jrr/rraa002] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 12/30/2019] [Accepted: 01/27/2020] [Indexed: 05/08/2023]
Abstract
The malignant traits involved in tumor relapse, metastasis and the expansion of cancer stem-like cells are acquired via the epithelial-mesenchymal transition (EMT) process in the tumor microenvironment. In addition, the tumor microenvironment strongly supports the survival and growth of malignant tumor cells and further contributes to the reduced efficacy of anticancer therapy. Ionizing radiation can influence the tumor microenvironment, because it alters the biological functions of endothelial cells composing tumor vascular systems. However, to date, studies on the pivotal role of these endothelial cells in mediating the malignancy of cancer cells in the irradiated tumor microenvironment are rare. We previously evaluated the effects of irradiated endothelial cells on the malignant traits of human liver cancer cells and reported that endothelial cells irradiated with 2 Gy reinforce the malignant properties of these cancer cells. In this study, we investigated the signaling mechanisms underlying these events. We revealed that the increased expression level of IL-4 in endothelial cells irradiated with 2 Gy eventually led to enhanced migration and invasion of cancer cells and further expansion of cancer stem-like cells. In addition, this increased level of IL-4 activated the ERK and AKT signaling pathways to reinforce these events in cancer cells. Taken together, our data indicate that ionizing radiation may indirectly modulate malignancy by affecting endothelial cells in the tumor microenvironment. Importantly, these indirect effects on malignancy are thought to offer valuable clues or targets for overcoming the tumor recurrence after radiotherapy.
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Affiliation(s)
- Sung Dae Kim
- Research Center, Dongnam Institute of Radiological & Medical Sciences (DIRAMS), Busan, Republic of Korea
| | - Ji Sue Baik
- Research Center, Dongnam Institute of Radiological & Medical Sciences (DIRAMS), Busan, Republic of Korea
| | - Jae-Hye Lee
- Research Center, Dongnam Institute of Radiological & Medical Sciences (DIRAMS), Busan, Republic of Korea
| | - Seo-Won Mun
- Research Center, Dongnam Institute of Radiological & Medical Sciences (DIRAMS), Busan, Republic of Korea
| | - Joo Mi Yi
- Department of Microbiology and Immunology, College of Medicine, Inje University, Busan, Republic of Korea
| | - Moon-Taek Park
- Research Center, Dongnam Institute of Radiological & Medical Sciences (DIRAMS), Busan, Republic of Korea
- Corresponding author. Dongnam Institute of Radiological & Medical Sciences (DIRAMS), 40 Jwadong-gil, Jangan-eup, Gijang-gun, Busan 46033, Republic of Korea. Tel: +82-51-720-5141; Fax: +82-51-720-5929;
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11
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Long Z, Dai J, Hu Q, Wang Q, Zhen S, Zhao Z, Liu Z, Hu JJ, Lou X, Xia F. Nanococktail Based on AIEgens and Semiconducting Polymers: A Single Laser Excited Image-Guided Dual Photothermal Therapy. Theranostics 2020; 10:2260-2272. [PMID: 32104506 PMCID: PMC7019155 DOI: 10.7150/thno.41317] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Accepted: 12/09/2019] [Indexed: 12/12/2022] Open
Abstract
Semiconducting polymers (SPs)-based dual photothermal therapy (PTT) obtained better therapeutic effect than single PTT due to its higher photothermal conversion efficiency. However, most dual PTT need to use two lasers for heat generation, which brings about inconvenience and limitation to the experimental operations. Herein, we report the development of "nanococktail" nanomaterials (DTPR) with 808 nm-activated image-guided dual photothermal properties for optimized cancer therapy. Methods: In this work, we co-encapsulated AIEgens (TPA-BDTO, T) and SPs (PDPPP, P) by using maleimide terminated amphiphilic polymer (DSPE-PEG2000-Mal, D), then further conjugated the targeting ligands (RGD, R) through "click" reaction. Finally, such dual PTT nanococktail (termed as DTPR) was constructed. Results: Once DTPR upon irradiation with 808 nm laser, near-infrared fluorescence from T could be partially converted into thermal energy through fluorescence resonance energy transfer (FRET) between T and P, coupling with the original heat energy generated by the photothermal agent P itself, thus resulting in image-guided dual PTT. The photothermal conversion efficiency of DTPR reached 60.3% (dual PTT), much higher as compared to its inherent photothermal effect of only 31.5% (single PTT), which was further proved by the more severe photothermal ablation in vitro and in vivo upon 808 nm laser irradiation. Conclusion: Such smart "nanococktail" nanomaterials could be recognized as a promising photothermal nanotheranostics for image-guided cancer treatment.
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Affiliation(s)
- Zi Long
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Jun Dai
- Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Qinyu Hu
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Quan Wang
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Shijie Zhen
- State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission, South China University of Technology, Guangzhou 510640, China
| | - Zujin Zhao
- State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission, South China University of Technology, Guangzhou 510640, China
| | - Zitong Liu
- Beijing National Laboratory for Molecular Sciences, Organic Solids Laboratory, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Jing-Jing Hu
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Xiaoding Lou
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
| | - Fan Xia
- Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China
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12
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Ma R, Zheng G, Shao C, Liu J, Lv H, Zhang G. Downregulation of miR-196b Promotes Glioma Cell Sensitivity to Temozolomide Chemotherapy and Radiotherapy. Ann Clin Lab Sci 2018; 48:719-725. [PMID: 30610041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Human glioma is the most common type of primary brain tumor. The survival rate of people with a malignant glioma is extremely low, primarily due to a lack of effective treatments. We previously reported that miR-196b expression is upregulated in glioblastoma tissues and overexpression of miR-196b is associated with poor prognosis. miR-196b acts as an oncogene by enhancing cellular proliferation and increasing the expression of E2F1, which plays an important role in the PI3K/AKT signaling pathway. In the present study, we explored the effects of miR-196b expression on glioma cells and characterized the relationship between miR-196b expression and the PI3K/AKT signaling pathway. We found that downregulation of miR-196b decreased the proliferation of U87 and U251 glioma cells. When anti-miR-196b and radiotherapy were used together, cellular proliferation decreased, whereas apoptosis and caspase 3/7activity, an indicator of apoptosis, increased. Meanwhile, downregulation of miR-196b remarkably inhibited glioma cell growth and colony formation when concurrent with temozolomide administration. Further studies demonstrated that neither upregulation nor downregulation of miR-196b markedly changed the protein expression levels of downstream molecules in the PI3K/AKT signaling pathway in cellular experiments. Therefore, whether miR-196b plays a role by activating the PI3K/AKT signaling pathway has not yet been determined. Together, our findings indicate that downregulation of miR-196b increased glioma cell sensitivity to temozolomide chemotherapy and radiotherapy and may be a valuable target when treating malignant gliomas. However, further studies are required to accurately characterize the mechanism by which miR-196b elicits its pivotal role.
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Affiliation(s)
- Ruimin Ma
- Laboratory Diagnosis Center, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- Beijing Engineering Research Center of Immunological Reagents Clinical Research, Beijing, China
| | - Guanghui Zheng
- Laboratory Diagnosis Center, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- Beijing Engineering Research Center of Immunological Reagents Clinical Research, Beijing, China
| | - Chunqing Shao
- Laboratory Diagnosis Center, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- Beijing Engineering Research Center of Immunological Reagents Clinical Research, Beijing, China
| | - Jingzheng Liu
- Laboratory Diagnosis Center, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- Beijing Engineering Research Center of Immunological Reagents Clinical Research, Beijing, China
| | - Hong Lv
- Laboratory Diagnosis Center, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- Beijing Engineering Research Center of Immunological Reagents Clinical Research, Beijing, China
| | - Guojun Zhang
- Laboratory Diagnosis Center, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
- Beijing Engineering Research Center of Immunological Reagents Clinical Research, Beijing, China
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13
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Keta OD, Todorović DV, Bulat TM, Cirrone PGA, Romano F, Cuttone G, Petrović IM, Ristić Fira AM. Comparison of human lung cancer cell radiosensitivity after irradiations with therapeutic protons and carbon ions. Exp Biol Med (Maywood) 2017; 242:1015-1024. [PMID: 27633574 PMCID: PMC5444635 DOI: 10.1177/1535370216669611] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 08/23/2016] [Indexed: 12/05/2023] Open
Abstract
The aim of this study was to investigate effects of irradiations with the therapeutic proton and carbon ion beams in two non-small cell lung cancers, CRL5876 adenocarcinoma and HTB177 large cell lung carcinoma. The DNA damage response dynamics, cell cycle regulation, and cell death pathway activation were followed. Viability of both cell lines was lower after carbon ions compared to the therapeutic proton irradiations. HTB177 cells showed higher recovery than CRL5876 cells seven days following the treatments, but the survival rates of both cell lines were lower after exposure to carbon ions with respect to therapeutic protons. When analyzing cell cycle distribution of both CRL5876 and HTB177 cells, it was noticed that therapeutic protons predominantly induced G1 arrest, while the cells after carbon ions were arrested in G2/M phase. The results illustrated that differences in the levels of phosphorylated H2AX, a double-strand break marker, exist after therapeutic proton and carbon ion irradiations. We also observed dose- and time-dependent increase in the p53 and p21 levels after applied irradiations. Carbon ions caused larger increase in the quantity of p53 and p21 compared to therapeutic protons. These results suggested that various repair mechanisms were induced in the treated cells. Considering the fact that we have not observed any distinct change in the Bax/Bcl-2 ratio following irradiations, it seemed that different types of cell death were involved in the response to the two types of irradiations that were applied.
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Affiliation(s)
- Otilija D Keta
- Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade 11001, Serbia
| | | | - Tanja M Bulat
- Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade 11001, Serbia
| | - Pablo GA Cirrone
- Laboratori Nazionali del Sud, Instituto Nazionale di Fisica Nucleare, Catania 95123, Italy
| | - Francesco Romano
- Laboratori Nazionali del Sud, Instituto Nazionale di Fisica Nucleare, Catania 95123, Italy
| | - Giacomo Cuttone
- Laboratori Nazionali del Sud, Instituto Nazionale di Fisica Nucleare, Catania 95123, Italy
| | - Ivan M Petrović
- Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade 11001, Serbia
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Volkova OY, Mechetina LV, Taranin AV, Zaboronok AA, Nakai K, Lezhnin SI, Frolov SA, Kasatov DA, Lezhnin SI, Frolov SA, Kasatov DA, Makarov AN, Sorokin IN, Sycheva TV, Shchudlo IM, Taskaev SY. [Impact of neutron radiation on the viability of tumor cells cultured in the presence of boron-10 isotope]. Vestn Rentgenol Radiol 2016; 97:283-288. [PMID: 30241133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
OBJECTIVE To investigate the impact of a neutron beam formed with the accelerator-based epithermal neutron source designed at the G.I. Budker Institute of Nuclear Physics (INP) on the viability of human and animal tumor cells cultured in the presence of boron-10 isotope. MATERIAL AND METHODS Human U251 and T98G glioma cells and Chinese hamster CHO-K1 and V-79 cells were incubated at various concentrations in the culture medium containing 10B-enriched L-boronophenylalanine. The cells were irradiated with a neuron beam using the accelerator-based epithermal neuron source. A clonogenic assay was used to evaluate the viability of the irradiated cells. The absorbed doses obtained from elastic scattering of fast neutrons by substance nuclei and the doses obtained from boron neutron capture were calculated using the NMS code. The absorbed doses of gamma-radiation were measured with a mixed radiation dosimeter. RESULTS The viability of boron-containing and intact human U251 and T98G cell lines and Chinese hamster CHO-K1 and V-79 cells was analyzed after neutron beam radiation. Irradiation of all four cell lines were cultured in the presence of 10B was shown to reduce their colony-forming capacity compared with the control. Elevated boron levels in the culture medium resulted in a significant decrease in the proportion of survived cells. Radiation had the most pronounced impact on the proliferative capacity of the human U251 glioma cell lines. CONCLUSION The cultures of human tumor cells and mammalian cells demonstrated that the neutron beam formed with the accelerator-based epithermal neutron source designed at the INP, was effective in reducing the viability of tumor cells in the presence of 10B.
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Kamenisch Y, Baban TSA, Schuller W, von Thaler AK, Sinnberg T, Metzler G, Bauer J, Schittek B, Garbe C, Rocken M, Berneburg M. UVA-Irradiation Induces Melanoma Invasion via the Enhanced Warburg Effect. J Invest Dermatol 2016; 136:1866-1875. [PMID: 27185340 DOI: 10.1016/j.jid.2016.02.815] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 01/20/2016] [Accepted: 02/14/2016] [Indexed: 10/21/2022]
Abstract
Melanoma is a malignant tumor in which UVA (320-400 nm) radiation is considered to be an important risk factor. But the role of UVA in melanoma progression toward an invasive phenotype is still not adequately investigated. For most proliferating tumor cells the preference of aerobic glycolysis has been described as the Warburg effect. Here we investigate the effect of UVA irradiation on changes in the Warburg effect and tumor progression toward invasive potential. On UVA irradiation, melanoma cell lines from initial tumors show an induction of the Warburg effect with increased glucose consumption and lactate production, which is at least partially mediated by reactive oxygen species. Associated with UVA treatment and enhanced lactic acid production, tumor-relevant proteases and in situ invasion is upregulated. Simultaneously, UVA increases intracellular concentrations of progression marker transketolase and activated protein kinase Akt, both involved in metabolic changes that increase with proliferation. Using invasion assays we show that lactic acid, resulting from the UVA enhanced and partially reactive oxygen species-mediated Warburg effect, increases the invasive potential of all melanoma cell lines investigated. Therefore, we demonstrate in melanoma cells that production of lactic acid, induced by UVA irradiation, increases invasiveness of melanoma cells via expression of tumor-relevant proteases.
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Affiliation(s)
- York Kamenisch
- Department of Dermatology, University Hospital Regensburg, Regensburg, Germany; Department of Dermatology, Eberhard Karls University, Tübingen, Germany
| | - Tarza S A Baban
- Department of Dermatology, Eberhard Karls University, Tübingen, Germany
| | - Winfried Schuller
- Department of Dermatology, Eberhard Karls University, Tübingen, Germany
| | | | - Tobias Sinnberg
- Department of Dermatology, Eberhard Karls University, Tübingen, Germany
| | - Gisela Metzler
- Department of Dermatology, Eberhard Karls University, Tübingen, Germany
| | - Jürgen Bauer
- Department of Dermatology, Eberhard Karls University, Tübingen, Germany
| | - Birgit Schittek
- Department of Dermatology, Eberhard Karls University, Tübingen, Germany
| | - Claus Garbe
- Department of Dermatology, Eberhard Karls University, Tübingen, Germany
| | - Martin Rocken
- Department of Dermatology, Eberhard Karls University, Tübingen, Germany
| | - Mark Berneburg
- Department of Dermatology, University Hospital Regensburg, Regensburg, Germany.
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Abstract
PURPOSE: Curcumin, a potential chemopreventive agent, was found to inhibit cancer cells in S/G2M phases of the cell cycle, when radiation is more effective. The purpose of the current study was to investigate whether curcumin can sensitize squamous cell carcinoma (SCC) cells to the ionizing effects of irradiation.METHODS: Curcumin (3.5 μM) was added for 48 hours to an SCC cell line prior to irradiation. Cell growth (counts) and colony-formation (colonogenic assay) were examined after radiation.RESULTS: Incubation with curcumin only (3.75 μM) for 48 hours did not decrease the number of cells or the ability to form colonies in the absence of radiation. However, in plates that were exposed to 1–5 Gy of radiation, cell counts dropped significantly if pretreated with curcumin with a maximal effect at 2.5 Gy (where the cell counts dropped from 1240 to 1017, P < 0.001). The colonogenic assay revealed a significant decrease in the ability to form colonies following pretreatment with curcumin in all radiation doses ( P < 0.05).CONCLUSIONS: Given the appropriate doses, curcumin exhibits radio-sensitizing effects on SCC cells in vitro.
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Affiliation(s)
- Avi Khafif
- Department of Otolaryngology, Tel-Aviv Sourasky Medical Center, Israel.
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Baek SH, Ko JH, Lee H, Jung J, Kong M, Lee JW, Lee J, Chinnathambi A, Zayed ME, Alharbi SA, Lee SG, Shim BS, Sethi G, Kim SH, Yang WM, Um JY, Ahn KS. Resveratrol inhibits STAT3 signaling pathway through the induction of SOCS-1: Role in apoptosis induction and radiosensitization in head and neck tumor cells. Phytomedicine 2016; 23:566-577. [PMID: 27064016 DOI: 10.1016/j.phymed.2016.02.011] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 02/12/2016] [Accepted: 02/15/2016] [Indexed: 06/05/2023]
Abstract
BACKGROUND Signal transducer and activator of transcription 3 (STAT3) is persistently activated in squamous cell carcinoma of the head and neck (SCCHN) and can cause uncontrolled cellular proliferation and division. HYPOTHESIS Thus, its targeted abrogation could be an effective strategy to reduce the risk of SCCHN. Resveratrol is known for its anti-cancer efficacy in a variety of cancer models. STUDY DESIGN The effect resveratrol on STAT3 activation, associated protein kinases, phosphatases, cellular proliferation and apoptosis was investigated. METHODS We evaluated the effect of resveratrol on STAT3 signaling cascade and its regulated functional responses in SCCHN cells. RESULTS We found that HN3 and FaDu cells expressed strongly phosphorylated STAT3 on both tyrosine 705 and serine 727 residues as compared to other SCCHN cells. The phosphorylation was completely suppressed by resveratrol in FaDu cells, but not substantially in HN3 cells. STAT3 suppression was mediated through the inhibition of activation of upstream JAK2, but not of JAK1 and Src kinases. Treatment with the protein tyrosine phosphatase (PTP) inhibitor pervanadate reversed the resveratrol-induced down-regulation of STAT3, thereby indicating a critical role for a PTP. We also found that resveratrol induced the expression of the SOCS-1 protein and mRNA. Further, deletion of SOCS-1 gene by siRNA suppressed the induction of SOCS-1, and reversed the inhibition of STAT3 activation. Resveratrol down-regulated various STAT3-regulated gene products, inhibited proliferation, invasion, as well as induced the cell accumulation in the sub-G1 phase and caused apoptosis. Beside, this phytoalexin also exhibited the enhancement of apoptosis when combined with ionizing radiation treatment. CONCLUSION Our results suggest that resveratrol blocks STAT3 signaling pathway through induction of SOCS-1, thus attenuating STAT3 phosphorylation and proliferation in SCCHN cells.
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Affiliation(s)
- Seung Ho Baek
- College of Korean Medicine, Kyung Hee University, 24 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea
| | - Jeong-Hyeon Ko
- College of Korean Medicine, Kyung Hee University, 24 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea
| | - Hanwool Lee
- College of Korean Medicine, Kyung Hee University, 24 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea
| | - Jinhong Jung
- Department of Radiation Oncology, Kyung Hee University Medical Center, Kyung Hee University School of Medicine, 23 Kyungheedae-ro, Dongdaemoon-gu, Seoul 130-872, Republic of Korea
| | - Moonkyoo Kong
- Department of Radiation Oncology, Kyung Hee University Medical Center, Kyung Hee University School of Medicine, 23 Kyungheedae-ro, Dongdaemoon-gu, Seoul 130-872, Republic of Korea
| | - Jung-woo Lee
- Department of Oral & Maxillofacial Surgery, Kyung Hee University Dental Hospital, Kyung Hee University School of Dentistry, 23 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-872, Republic of Korea
| | - Junhee Lee
- College of Korean Medicine, Kyung Hee University, 24 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea
| | - Arunachalam Chinnathambi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - M E Zayed
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Sulaiman Ali Alharbi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Seok-Geun Lee
- College of Korean Medicine, Kyung Hee University, 24 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea
| | - Bum Sang Shim
- College of Korean Medicine, Kyung Hee University, 24 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea
| | - Gautam Sethi
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh 11451, Saudi Arabia; Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, 117600, Singapore
| | - Sung-Hoon Kim
- College of Korean Medicine, Kyung Hee University, 24 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea
| | - Woong Mo Yang
- College of Korean Medicine, Kyung Hee University, 24 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea
| | - Jae-Young Um
- College of Korean Medicine, Kyung Hee University, 24 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea
| | - Kwang Seok Ahn
- College of Korean Medicine, Kyung Hee University, 24 Kyungheedae-ro, Dongdaemun-gu, Seoul 130-701, Republic of Korea.
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Mutschelknaus L, Peters C, Winkler K, Yentrapalli R, Heider T, Atkinson MJ, Moertl S. Exosomes Derived from Squamous Head and Neck Cancer Promote Cell Survival after Ionizing Radiation. PLoS One 2016; 11:e0152213. [PMID: 27006994 PMCID: PMC4805173 DOI: 10.1371/journal.pone.0152213] [Citation(s) in RCA: 116] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Accepted: 03/10/2016] [Indexed: 12/12/2022] Open
Abstract
Exosomes are nanometer-sized extracellular vesicles that are believed to function as intercellular communicators. Here, we report that exosomes are able to modify the radiation response of the head and neck cancer cell lines BHY and FaDu. Exosomes were isolated from the conditioned medium of irradiated as well as non-irradiated head and neck cancer cells by serial centrifugation. Quantification using NanoSight technology indicated an increased exosome release from irradiated compared to non-irradiated cells 24 hours after treatment. To test whether the released exosomes influence the radiation response of other cells the exosomes were transferred to non-irradiated and irradiated recipient cells. We found an enhanced uptake of exosomes isolated from both irradiated and non-irradiated cells by irradiated recipient cells compared to non-irradiated recipient cells. Functional analyses by exosome transfer indicated that all exosomes (from non-irradiated and irradiated donor cells) increase the proliferation of non-irradiated recipient cells and the survival of irradiated recipient cells. The survival-promoting effects are more pronounced when exosomes isolated from irradiated compared to non-irradiated donor cells are transferred. A possible mechanism for the increased survival after irradiation could be the increase in DNA double-strand break repair monitored at 6, 8 and 10 h after the transfer of exosomes isolated from irradiated cells. This is abrogated by the destabilization of the exosomes. Our results demonstrate that radiation influences both the abundance and action of exosomes on recipient cells. Exosomes transmit prosurvival effects by promoting the proliferation and radioresistance of head and neck cancer cells. Taken together, this study indicates a functional role of exosomes in the response of tumor cells to radiation exposure within a therapeutic dose range and encourages that exosomes are useful objects of study for a better understanding of tumor radiation response.
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Affiliation(s)
- Lisa Mutschelknaus
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Radiation Biology, Neuherberg, Germany
| | - Carsten Peters
- Department of Chemistry, Technical University of Munich, Munich, Germany
| | - Klaudia Winkler
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Radiation Biology, Neuherberg, Germany
| | - Ramesh Yentrapalli
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Radiation Biology, Neuherberg, Germany
| | - Theresa Heider
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Radiation Biology, Neuherberg, Germany
| | - Michael John Atkinson
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Radiation Biology, Neuherberg, Germany
- Radiation Biology, Technical University of Munich, Munich, Germany
| | - Simone Moertl
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Radiation Biology, Neuherberg, Germany
- * E-mail:
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Zhang Y, Zuo Y, Guan Z, Lu W, Xu Z, Zhang H, Yang Y, Yang M, Zhu H, Chen X. Salinomycin radiosensitizes human nasopharyngeal carcinoma cell line CNE-2 to radiation. Tumour Biol 2016; 37:305-11. [PMID: 26209294 DOI: 10.1007/s13277-015-3730-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Accepted: 06/28/2015] [Indexed: 01/08/2023] Open
Abstract
Nasopharyngeal carcinoma (NPC) is primarily treated by chemoradiation. However, how to promote radiation sensitivity in NPC remains a challenge. Salinomycin is potentially useful for the treatment of cancer. This study aimed to explore the radiosensitivity of salinomycin on human nasopharyngeal carcinoma cell line CNE-2. CNE-2 were treated with salinomycin or irradiation, alone or in combination. The cytotoxicity effects of salinomycin were measured using CCK-8 assay. Clonogenic survival assay was used to evaluate the effects of salinomycin on the radiosensitivity of CNE-2. The changes of cell cycle distribution and apoptosis were assayed using flow cytometry. The expression of Caspase3/Bax/Bal-2 was detected by Western blotting. DNA damage was detected via γ-H2AX foci counting. The results showed that salinomycin induced apoptosis and G2/M arrest, increased Bax and cleaved Caspase3, decreased Bcl-2 expression, and increased the formation of γ-H2AX nuclear foci. These data suggest that salinomycin may be a radiosensitizer for NPC radiotherapy.
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Affiliation(s)
- Yongqin Zhang
- Department of Radiation Oncology, The First People's Hospital of Zhangjiagang, #68 Jiyangxi Road, Zhangjiagang, Jiangsu province, 215600, China
| | - Yun Zuo
- Department of Radiation Oncology, The First People's Hospital of Zhangjiagang, #68 Jiyangxi Road, Zhangjiagang, Jiangsu province, 215600, China.
| | - Zhifeng Guan
- Department of Radiation Oncology, Nantong Tumor Hospital, Affiliated Tumor Hospital of Nantong University, Nantong, 226321, China
| | - Weidong Lu
- Department of Radiation Oncology, The First People's Hospital of Zhangjiagang, #68 Jiyangxi Road, Zhangjiagang, Jiangsu province, 215600, China
| | - Zheng Xu
- Department of Radiation Oncology, The First People's Hospital of Zhangjiagang, #68 Jiyangxi Road, Zhangjiagang, Jiangsu province, 215600, China
| | - Hao Zhang
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China
| | - Yan Yang
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China
| | - Meilin Yang
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China
| | - Hongcheng Zhu
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China
| | - Xiaochen Chen
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, 210029, China
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Abstract
BACKGROUND Osteosarcoma is the most prevalent malignant neoplasm in children and young adults with a very high propensity for local invasion and early systemic metastases. Radiotherapy has been widely used in metastatic and recurrent osteosarcoma, particularly with chemoresistance. METHODS To determine whether autophagy is induced by radiation therapy and contributes to cell death of osteosarcoma, we investigated the influence of autophagy blockage on the radiosensitivity of osteosarcoma MG-63 cells in vitro. Firstly, autophagy in the MG-63 osteosarcoma cells after radiation treatment was determined by quantitative GFP-LC3 analysis and autophagy-related molecules analysis by western blotting. Then the viability and death of cells post-blockage of autophagy was determined by MTT assay and flow cytometry. RESULTS It was demonstrated that autophagy was involved in MG-63 cells subject to radiation. Significantly up-regulated autophagic vesicles in MG-63 cells were subject to radiation. The transformation of LC-3 I to LC-3 II and the expression of autophagy-associated molecules were promoted in the radiation-treated MG-63 cells. Moreover, autophagy could ameliorate the cell viability post radiation. On the other hand, the chemical blockage of autophagy by 3MA not only could downregulate the level of autophagy, but also could reduce cell viability and accelerate apoptosis in the radiation-treated MG-63 cells. CONCLUSIONS Autophagy was involved in the radiation treatment of MG-63 osteosarcoma cells, and autophagy blockage enhances the radiosensitivity of the osteosarcoma cell line MG-63 in vitro.
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Xu Y, Chen B, Xu K, Li B, Wen Y, Zhao P. [Effect of IgG gene silencing by RNA interference on radiosensitivity of prostate cancer PC3 cells]. Nan Fang Yi Ke Da Xue Xue Bao 2015; 35:397-402. [PMID: 25818788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVE To investigate the effect of RNA interference of IgG gene on the radiosensitivity of the human prostate cancer PC3 cell line. METHODS PC3 cells were trasnfected via lipofectamine by the shRNA vector FCGR1AshRNA targeting the Fc segment of IgG, using NCshRNA as the negative control. Q-PCR and Western blotting were used to analyze the expression of IgG in the trasnfected cells. The cells were then exposed to ⁶⁰Co γ ray at 0, 2, 4, 6, 8, 10 Gy, and the cell proliferation was evaluated by MTS and the cells apoptosis estimated by flow cytometry at 12, 24 and 48 h. RESULTS MTS assay showed that ⁶⁰Co γ ray significantly inhibited the proliferation of PC3 cells transfected with FCGR1AshRNA as compared with NCshRNA-transfected and blank control cells (P<0.05). Flow cytometry showed that the cell apoptosis rate was significantly higher in FCGR1AshRNA group than in NCshRNA and blank control groups at 48 h after γ ray exposure (P<0.05). At 12, 24 and 48 h after 6 Gy radiation, the cells in FCGR1AshRNA group showed a significantly lowered proliferation rate and an increased apoptosis rate (P<0.05). CONCLUSION The shRNA targeting IgG gene can significantly enhance the sensitivity of PC3 cells to radiation. The combination of RNA interference targeting IgG gene with radiotherapy may be more effective in the treatment of prostate cancer.
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Affiliation(s)
- Yawen Xu
- Department of Urology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China.E-mail:
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22
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Harder SJ, Matthews Q, Isabelle M, Brolo AG, Lum JJ, Jirasek A. A Raman spectroscopic study of cell response to clinical doses of ionizing radiation. Appl Spectrosc 2015; 69:193-204. [PMID: 25588147 DOI: 10.1366/14-07561] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The drive toward personalized radiation therapy (RT) has created significant interest in determining patient-specific tumor and normal tissue responses to radiation. Raman spectroscopy (RS) is a non-invasive and label-free technique that can detect radiation response through assessment of radiation-induced biochemical changes in tumor cells. In the current study, single-cell RS identified specific radiation-induced responses in four human epithelial tumor cell lines: lung (H460), breast (MCF-7, MDA-MB-231), and prostate (LNCaP), following exposure to clinical doses of radiation (2-10 Gy). At low radiation doses (2 Gy), H460 and MCF-7 cell lines showed an increase in glycogen-related spectral features, and the LNCaP cell line showed a membrane phospholipid-related radiation response. In these cell lines, only spectral information from populations receiving 10 Gy or less was required to identify radiation-related features using principal component analysis (PCA). In contrast, the MDA-MB-231 cell line showed a significant increase in protein relative to nucleic acid and lipid spectral features at doses of 6 Gy or higher, and high-dose information (30, 50 Gy) was required for PCA to identify this biological response. The biochemical nature of the radiation-related changes occurring in cells exposed to clinical doses was found to segregate by status of p53 and radiation sensitivity. Furthermore, the utility of RS to identify a biological response in human tumor cells exposed to therapeutic doses of radiation was found to be governed by the extent of the biochemical changes induced by a radiation response and is therefore cell line specific. The results of this study demonstrate the utility and effectiveness of single-cell RS to identify and measure biological responses in tumor cells exposed to standard radiotherapy doses.
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Affiliation(s)
- Samantha J Harder
- University of Victoria, Department of Physics and Astronomy, PO Box 1700 STN CSC, Victoria, British Columbia V8W 2Y2, Canada
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23
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Quan F, Zhao Q, Shao Y, Li H, Zhao R. [Resveratrol enhances radiosensitivity of human hypopharyngeal carcinoma cell line in nude mice]. Nan Fang Yi Ke Da Xue Xue Bao 2014; 34:1646-1649. [PMID: 25413066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVE To study the radiosensitizing effect of resveratrol on human hypo pharyngeal squamous cell carcinoma (FaDu) cells in nude mice. METHODS Forty-three nude mice bearing FaDu cell xenografts were randomized into control group, radiotherapy (12 Gy) group, resveratrol treatment (50 mg/kg) group, and radiotherapy plus resveratrol treatment group. After corresponding treatments, the tumor volume in the mice was measured every 3 days, and the microvessel density (MVD) in the tumor was evaluated with CD31 immunofluorescence histochemical staining. RESULTS The tumor volume and weight were the smallest in mice receiving radiotherapy plus resveratrol treatment (P<0.05) but comparable between those having resveratrol treatment alone and the control mice. Radiotherapy plus resveratrol treatment resulted in a tumor inhibition rate of 76.64% and a significantly decreased MVD in the tumor compared with the other 3 groups. CONCLUSION Resveratrol can produce a radiosensitizing effect on human hypopharyngeal carcinoma in nude mice.
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Affiliation(s)
- Fang Quan
- Department of Otorhinolaryngology-Head Neck Surgery, First Affiliated of Xi'an Jiao Tong University, Xi'an 710061, China. E-mail:
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Lövey J, Nie D, Tóvári J, Kenessey I, Kandouz M, Tímár J, Kásler M, Honn KV. [Selective 12-lipoxygenase inhibition potentiates the effect of radiation on human prostate cancer cells in vitro and in vivo]. Magy Onkol 2014; 58:211-218. [PMID: 25260086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 08/12/2014] [Indexed: 06/03/2023]
Abstract
Prostate cancer is one of the leading cancer types in males in the developed world. Radiotherapy is a major method in the curative treatment of prostate cancer however, up to 30% of the patients experience local relapse. Arachidonic acid metabolites have been shown to have important role in cancer. 12-lipoxygenase (12-LOX) has been proven to significantly influence prostate cancer progression, by apoptosis regulation and by promoting cancer cell survival. In this study we examined whether 12-LOX inhibition may increase radiation sensitivity of prostate cancer cells in vitro and in vivo. Prostate cancer cell lines were treated with 12-LOX inhibitors, different doses of radiation and the combination of 12-LOX inhibitors and radiation. We measured the effect of these treatments through clonogenic survival and apoptosis in vitro and tumor growth in vivo in a tumor xenograft model. 12-LOX inhibition and radiation both increased apoptosis and decreased clonogenic survival of prostate cancer cell lines in vitro. Combined treatment resulted in a supra-additive effect in vitro. In vivo both 12-LOX inhibition and radiotherapy caused delay in growth of the xenograft tumors but the combined treatment resulted in the strongest growth inhibition. The presented data prove that 12-LOX and its metabolite 12(S)-HETE have a major role in prostate cancer cell progression and radiosensitivity. We have shown by different methods in vitro and in vivo that inhibition of 12-LOX activity significantly sensitizes prostate cancer cells to radiation. Therefore we can state that 12-LOX inhibitors are promising compounds to be developed to become a new class of clinical radiation sensitizers in prostate cancer.
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Affiliation(s)
| | - Daotai Nie
- Department of Medical Microbiology, Immunology, and Cell Biology, Southern Illinois University School of Medicine, Springfield, USA
| | | | - István Kenessey
- 2. Sz. Patológiai Intézet, Semmelweis Egyetem, Budapest, Hungary
| | - Mahmout Kandouz
- Department of Pathology, Wayne State University School of Medicine, Detroit, USA
| | - József Tímár
- 2. Sz. Patológiai Intézet, Semmelweis Egyetem, Budapest, Hungary
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Gou QH, Xie YX, Wu YX, Wang QQ, Wang Z, Li P. [Downregulation of 53BP1 by short hairpin RNA enhances radiosensitivity in laryngeal carcinoma cells]. Sichuan Da Xue Xue Bao Yi Xue Ban 2014; 45:754-759. [PMID: 25341334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVE To determine the effect of downregulation of 53BP1 expression on cell growth and radiosensitivity in laryngeal carcinoma Hep-2 cells. METHODS HEP-2 cell lines were established with a stable knockdown of 53BP1 with short hairpin RNA (shRNA). The level of expressed protein of negative control group (NC),wild type Hep-2 and downregulation of 53BP1 (P6) group was determined by Western blotting. Proliferation on normal conditions was detected by MTT. Radiosensitivity and growth of cells were detected by flow cytometry. RESULTS A stable 53BP1 downregulated cell line P6 was established. Similar cell growth was observed between the 53BP1 downregulated cells and the control cells. The downregulation of 53BP1 reduced the number of clonogenic cells exposed to radiation. Compared with wild type Hep-2 group and NC group, Western blot results showed a decrease in 53BP1 protein level in P6 group (P < 0.05), reducing the ratio of arrest of G2/M with radiation dose increased (P < 0.05). MTT results revealed the lower 53BP1 protein level did not affect the cell proliferation. After exposure to 0, 2, 6, 10 Gy ionizing radiation (IR), P6 cells had lower, radiosensitivity parameters (D0, SF2, Dq, N) than controls and wild type Hep-2 (P < 0.05). CONCLUSION RNA interference could effectively down-regulate the expression of 53BP1 and reduce arrest of G2/M phase, thus enhancing the radiosensitivity of Hep-2 cell line.
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Wu SY, Liu YW, Wang YK, Lin TH, Li YZ, Chen SH, Lee YR. Ionizing radiation induces autophagy in human oral squamous cell carcinoma. J BUON 2014; 19:137-144. [PMID: 24659655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
PURPOSE Irradiation-induced autophagy has been reported in several types of cancers, however, the relationship between irradiation and autophagy in human oral squamous cell carcinoma (OSCC) has not yet been described. In this study we investigated the induction of autophagy in cell lines by exposing them to ionizing irradiation. METHODS Human OSCC OC3 and SAS cell lines were used in this study. Cell viability and induction of autophagy were determined under irradiation treatment. The GFP-LC3 puncta formation and the levels of LC3-II as indicators of autophagy were detected by fluorescence microscopy and Western blot method. The signaling pathways involved in irradiation-mediated autophagy were also determined by Western blot method. RESULTS Irradiation decreased cell viability only in OC3 cells, while autophagic machinery and related signaling pathways were found to be elevated after irradiation in OC3 and SAS cells. However, autophagic degradation determined by the reduction of p62 levels was only found in OC3 cells, suggesting autophagosome accumulation took place in SAS cells. In addition, irradiation accompanied with rapamycin treatment elevated autophagy formation and induced death of OC3 cells. CONCLUSIONS These results suggested that induction of autophagy might provide an advantageous strategy to increase the anticancer effects of radiotherapy in patients with OSCCs.
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Affiliation(s)
- Szu-Yuan Wu
- Department of Radiation Oncology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
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Wang H, Li J, Qu A, Liu J, Zhao Y, Wang J. The different biological effects of single, fractionated and continuous low dose rate irradiation on CL187 colorectal cancer cells. Radiat Oncol 2013; 8:196. [PMID: 23937791 PMCID: PMC3751200 DOI: 10.1186/1748-717x-8-196] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 08/07/2013] [Indexed: 12/02/2022] Open
Abstract
PURPOSE To determine the biological effectiveness of single, fractionated and continuous low dose rate irradiation on the human colorectal cancer cell line CL187 in vitro and explore the cellular mechanisms. MATERIALS AND METHODS The CL187 cells were exposed to radiation of 6 MV X-ray at a high dose rate of 4Gy/min and 125I seed at a low dose rate of 2.77 cGy/h. Three groups were employed: single dose radiation group (SDR), fractionated dose radiation group (FDR) by 2Gy/f and continuous low dose rate radiation group (CLDR). Four radiation doses 2, 4, 6 and 8Gy were chosen and cells without irradiation as the control. The responses of CL187 cells to distinct modes of radiation were evaluated by the colony-forming assay, cell cycle progression as well as apoptosis analysis. In addition, we detected the expression patterns of DNA-PKcs, Ku70 and Ku80 by Western blotting. RESULTS The relative biological effect for 125I seeds compared with 6 MV X-ray was 1.42. 48 hrs after 4Gy irradiation, the difference between proportions of cells at G2/M phase of SDR and CLDR groups were statistically significant (p = 0.026), so as the FDR and CLDR groups (p = 0.005). 48 hrs after 4Gy irradiation, the early apoptotic rate of CLDR group was remarkably higher than SDR and FDR groups (CLDR vs. SDR, p = 0.001; CLDR vs. FDR, p = 0.02), whereas the late apoptotic rate of CLDR group increased significantly compared with SDR and FDR group (CLDR vs. SDR, p = 0.004; CLDR vs. FDR, p = 0.007). Moreover, DNA-PKcs and Ku70 expression levels in CLDR-treated cells decreased compared with SDR and FDR groups. CONCLUSIONS Compared with the X-ray high dose rate irradiation, 125I seeds CLDR showed more effective induction of cell apoptosis and G2/M cell cycle arrest. Furthermore, 125I seeds CLDR could impair the DNA repair capability by down-regulating DNA-PKcs and Ku70 expression.
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Affiliation(s)
- Hao Wang
- Department of Radiation Oncology, Peking University Third Hospital, North Road No. 49, Haidian District, 100191, Beijing, China
| | - Jinna Li
- Department of Radiation Oncology, Peking University Third Hospital, North Road No. 49, Haidian District, 100191, Beijing, China
| | - Ang Qu
- Department of Radiation Oncology, Peking University Third Hospital, North Road No. 49, Haidian District, 100191, Beijing, China
| | - Jingjia Liu
- Department of Radiation Oncology, Peking University Third Hospital, North Road No. 49, Haidian District, 100191, Beijing, China
| | - Yong Zhao
- Transplantation Biology Research Division, State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Junjie Wang
- Department of Radiation Oncology, Peking University Third Hospital, North Road No. 49, Haidian District, 100191, Beijing, China
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Yang GQ, Wang D, Wang YS, Wang YY, Yang K. [Radiosensitization effect of black garlic extract on lung cancer cell line Lewis cells]. Zhongguo Zhong Xi Yi Jie He Za Zhi 2013; 33:1093-1097. [PMID: 24325061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
OBJECTIVE To explore the radiosensitization effect of black garlic extract (BGE) on lung cancer cell line Lewis cells. METHODS The inhibition rate of lung cancer cells after BGE action was detected by MTT. Effect of BGE combined radiotherapy on the colony formation rate was observed by cloning formation assay. Changes of the cell morphology were observed by Hoechst staining. Changes of the cell cycle were detected by flow cytometry. Real time PCR was used to detect mRNA expressions of bcl-2 and bax. RESULTS BGE could have significant inhibitory action on the growth of lung cancer Lewis cells. The combination of BGE and radiotherapy (by 60Co gamma) significantly induced Lewis cells' apoptosis in G2/M stage, obviously decreased the expression of bcl-2, and up-regulated the expression of bax. CONCLUSIONS BGE could sensitize the lung cancer Lewis cells to ionizing irradiation. This effect might be probably caused by changing the cell cycles and affecting expressions of bax and bcl-2.
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Affiliation(s)
- Gui-qing Yang
- National Key Department of Tumor Treatment by Integrative Medicine/Non-traumatic Center for Tumor Diagnosis and Treatment of the Whole Army, 107th Hospital of the People's Liberation Army, Shandong (264002), China
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Cheng J, Ekberg T, Engström M, Nestor M, Jensen HJ, Tolmachev V, Anniko M. Radioimmunotherapy With Astatine-211 Using Chimeric Monoclonal Antibody U36 in Head and Neck Squamous Cell Carcinoma. Laryngoscope 2013; 117:1013-8. [PMID: 17440426 DOI: 10.1097/mlg.0b013e31804b1a6d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVES In advanced head and neck squamous cell carcinoma (HNSCC), there is a need for an adjuvant treatment. We aim to evaluate the biodistribution and therapeutic effect of radioimmunotherapy using the alpha emitting, astatine-211-labeled, chimeric monoclonal antibody U36 (U36) on the HNSCC cell line UT-SCC7 in vivo. STUDY DESIGN Xenograft tumors were inoculated subcutaneously in nude mice. Astatine-211-labeled U36 was injected intravenously with or without blocking of target with nonlabeled U36. METHODS In the biodistribution experiments, radioactivity was measured in tumors and various organs at set time points. In the therapeutic experiments, two groups (with or without blocking) received therapy, and the tumor growth was compared with that of controls. In addition, one group received nonlabeled U36 only. RESULTS The biodistribution experiments demonstrated that astatine-211-labeled U36 could target UT-SCC7 xenografts in nude mice. With time, uptake increased in tumors and decreased in normal organs. Nonlabeled U36 did not influence tumor growth. In the two therapy groups, 18 of 20 tumors responded to therapy by decreasing or stabilizing their volumes. Significant difference was seen between the treated groups and the controls (P < .05). CONCLUSION The study illustrates the specific binding of astatine-211-labeled U36 to HNSCC and suggests radioimmunotherapy with the alpha emitting radionuclide to be a useful treatment modality.
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Affiliation(s)
- Junping Cheng
- Department of Oto-Rhino-Laryngology and Head and Neck Surgery, Uppsala University Hospital (Akademiska Sjukhuset), Uppsala, Sweden
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Huang JC, Zhang GH, Li JJ, Yan RC, Wu XF, Zheng J, Lü MY, Xie FA. [Radiobiological characteristics and MRN complex expression of human nasopharyngeal carcinoma cell lines]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2013; 48:195-9. [PMID: 23755782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
OBJECTIVE To study the radiobiological characteristic of human nasopharyngeal carcinoma cell lines CNE1 and CNE2 and the changes in expression MRN (Mre11-Rad50-Nbs1) complex in the cell lines exposed to irradiation. METHODS CNE1 and CNE2 were irradiated by a linear accelerator. Radiobiological characteristics were detected by colony assay and MTT assay. MRN complex expression were examined by Western blot. RESULTS Surviving fraction at 2 Gy (SF2), quasi-threshold Dose (Dq), and mean lethal dose (Do) of CNE1 were 0.56, 1.449 Gy and 1.480 Gy; SF2, Dq, and Do of CNE2 were 0.44, 0.776 Gy and 1.685 Gy, respectively. Survival fraction of CNE1 at the day 6 after 4 Gy irradiation was 0.59 and that of CNE2 was 0.79 when compared with control, with the up-regulated expressions of Rad50 in CNE1 and Mre11, Rad50 and Nbs1 in CNE2 (P < 0.05). CONCLUSIONS CNE1 and CNE2 were sensitive to radiation, but there were radioresistance cells in CNE2. The expressions of some components of MRN complex were up-regulated to repair DNA lesions induced by radiation.
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Affiliation(s)
- Jian-cong Huang
- Third Affiliated Hospital of Sun Yet-sun University, Guangzhou 510630, China
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Abstract
INTRODUCTION Evidence exists that exposure of non-irradiated cells to Irradiated Cell Conditioned Medium (ICCM) can cause effects similar to those resulting from direct radiation damage. This study attempts to validate the stochastic model, relating absorbed dose to the emission and processing of cell death signals by non-irradiated cells, in vitro in PC3 human prostate cancer cell line. METHODS The recipient cell survival was measured after exposure of cells to ICMM derived from donor cells: a) exposed to radiation doses from 2 Gy to 8 Gy and b) of concentrations varying from 2 × 10(2) to 6 × 10(6) irradiated with 2 Gy. RESULTS Exposure to ICCM, irradiated with doses between 2-8 Gy, resulted in a significant (p < 0.001) decrease in clonogenic survival of non-irradiated recipient cells compared to the control group. However, dose dependency above 2 Gy was not observed, indicating that any dose threshold was below 2 Gy. A significant (p < 0.001) decrease in survival was found in recipient cells exposed to the ICCM, derived from different concentrations of donor cells exposed to 2 Gy, compared to the control group. The recipient cell survival following exposure to ICCM derived from 2 × 10(2) cells was significantly higher (p < 0.5) compared to the rest of donor cell concentrations, indicating that the toxicity of ICCM depends on the cellular concentration of donor cells. Non-linear regression data fitting provided reasonable agreement with the microdosimetric model for the induction of cell killing through medium-borne signals. CONCLUSION For the given cell line and given experimental conditions, significant decreases in cell survival were observed in non-irradiated cells exposed to ICCM derived from donor cells of various concentrations and irradiated with different doses.
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Affiliation(s)
- Svetlana Sjostedt
- Medical Physics Department, Radiation Oncology, Royal Adelaide Hospital, South Australian Department of Health, South Australia, Australia.
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Lee S, Lim MJ, Kim MH, Yu CH, Yun YS, Ahn J, Song JY. An effective strategy for increasing the radiosensitivity of Human lung Cancer cells by blocking Nrf2-dependent antioxidant responses. Free Radic Biol Med 2012; 53:807-16. [PMID: 22684019 DOI: 10.1016/j.freeradbiomed.2012.05.038] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Revised: 05/17/2012] [Accepted: 05/27/2012] [Indexed: 01/01/2023]
Abstract
Radiotherapy and chemotherapeutic agents can effectively induce apoptosis through generation of reactive oxygen species (ROS). Cancer cells frequently express high levels of ROS-scavenging enzymes, which confer resistance to ROS-mediated cell death. Keap1 (Kelch-like ECH-associated protein 1) sequesters and promotes the degradation of the antioxidant response element-binding transcription factor Nrf2 (nuclear factor erythroid-2-related factor 2). In non-small-cell lung cancer (NSCLC) cell lines and NSCLC patients, Keap1 is often present as a biallelic mutant that results in constitutive activation of Nrf2 function, which contributes to cytoprotection against oxidative stress and xenobiotics. To identify small molecules that inhibit antioxidant responses and increase apoptotic death after radiotherapy, we screened a chemical library containing 8000 synthetic compounds using a cell-based luciferase assay system. 4-(2-Cyclohexylethoxy)aniline (IM3829) inhibited the increase in Nrf2-binding activity and expression of the Nrf2 target genes induced by treatment with tertiary butylhydroquinone or radiation. Combined treatment with IM3829 and radiation significantly inhibited clonogenic survival of H1299, A549, and H460 lung cancer cells. IM3829 significantly increased ROS accumulation in irradiated cells compared with cells exposed to radiation alone and led to apoptotic cell death, as confirmed by caspase-3 and PARP cleavage. In mice bearing H1299 or A549 lung cancer xenografts, IM3829 together with radiation inhibited tumor growth more effectively than radiation alone. Our findings suggest that IM3829 could be a promising radiosensitizer in lung cancer patients, particularly those with high expression of Nrf2.
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Affiliation(s)
- Saelooom Lee
- Department of Radiation Cancer Research, Korea Institute of Radiological & Medical Sciences, Seoul 139-706, Korea
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Pessetto ZY, Yan Y, Bessho T, Natarajan A. Inhibition of BRCT(BRCA1)-phosphoprotein interaction enhances the cytotoxic effect of olaparib in breast cancer cells: a proof of concept study for synthetic lethal therapeutic option. Breast Cancer Res Treat 2012; 134:511-517. [PMID: 22562176 PMCID: PMC3402595 DOI: 10.1007/s10549-012-2079-4#page-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2012] [Accepted: 04/21/2012] [Indexed: 07/19/2023]
Abstract
Synthetic lethal therapeutic strategy using poly(adenosine diphosphate [ADP]-ribose) polymerase (PARP) inhibitor olaparib in carriers of BRCA1 or BRCA2 mutation has shown promise in clinical settings. Since <5 % of patients are BRCA1 or BRCA2 mutation carriers, small molecules that functionally mimic BRCA1 or BRCA2 mutations will extend the synthetic lethal therapeutic option for non-mutation carriers. Here we provide proof of principle for this strategy using a BRCA1 inhibitor peptide 2 that targets the BRCT(BRCA1)-phosphoprotein interaction and mimics the M177R/K BRCA1 mutation. Reciprocal immunoprecipitation and immunoblotting of BRCA1 and Abraxas was used to demonstrate inhibitor 2 targets BRCT(BRCA1)-Abraxas interface. Immunostaining of γH2AX, cell cycle analysis and homologous recombination (HR) assays were conducted to confirm that inhibitor 2 functionally mimics a chemosensitizing BRCA1 mutation. The concept of synthetic lethal therapeutic strategy with the BRCA1 inhibitor 2 and the PARP inhibitor Olaparib was explored in HeLa, MDA-MB-231, and HCC1937 cell lines. The results show that inhibition of BRCA1 by 2 sensitizes HeLa and MDA-MB-231 cells but not HCC1937 to Olaparib mediated growth inhibition and apoptosis. These results provide the basis for developing high affinity BRCT(BRCA1) inhibitors as adjuvants to treat sporadic breast and ovarian cancers.
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Affiliation(s)
- Ziyan Yuan Pessetto
- Eppley Institute for Cancer Research, University of Nebraska Medical Center Omaha NE 68198
| | - Ying Yan
- Eppley Institute for Cancer Research, University of Nebraska Medical Center Omaha NE 68198, (402) 559-3036
| | - Tadayoshi Bessho
- Eppley Institute for Cancer Research, University of Nebraska Medical Center Omaha NE 68198, (402) 559-7018
| | - Amarnath Natarajan
- Eppley Institute for Cancer Research, Department of Pharmaceutical Sciences and Genetics Cell Biology and Anatomy, University of Nebraska Medical Center Omaha NE 68198, Telephone: (402) 559 3793, Fax number: (402) 559 8270
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Kim HJ, Kim JH, Chie EK, Da Young P, Kim IA, Kim IH. DNMT (DNA methyltransferase) inhibitors radiosensitize human cancer cells by suppressing DNA repair activity. Radiat Oncol 2012; 7:39. [PMID: 22429326 PMCID: PMC3375186 DOI: 10.1186/1748-717x-7-39] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Accepted: 03/20/2012] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Histone modifications and DNA methylation are two major factors in epigenetic phenomenon. Unlike the histone deacetylase inhibitors, which are known to exert radiosensitizing effects, there have only been a few studies thus far concerning the role of DNA methyltransferase (DNMT) inhibitors as radiosensitizers. The principal objective of this study was to evaluate the effects of DNMT inhibitors on the radiosensitivity of human cancer cell lines, and to elucidate the mechanisms relevant to that process. METHODS A549 (lung cancer) and U373MG (glioblastoma) cells were exposed to radiation with or without six DNMT inhibitors (5-azacytidine, 5-aza-2'-deoxycytidine, zebularine, hydralazine, epigallocatechin gallate, and psammaplin A) for 18 hours prior to radiation, after which cell survival was evaluated via clonogenic assays. Cell cycle and apoptosis were analyzed via flow cytometry. Expressions of DNMT1, 3A/3B, and cleaved caspase-3 were detected via Western blotting. Expression of γH2AX, a marker of radiation-induced DNA double-strand break, was examined by immunocytochemistry. RESULTS Pretreatment with psammaplin A, 5-aza-2'-deoxycytidine, and zebularine radiosensitized both A549 and U373MG cells. Pretreatment with psammaplin A increased the sub-G1 fraction of A549 cells, as compared to cells exposed to radiation alone. Prolongation of γH2AX expression was observed in the cells treated with DNMT inhibitors prior to radiation as compared with those treated by radiation alone. CONCLUSIONS Psammaplin A, 5-aza-2'-deoxycytidine, and zebularine induce radiosensitivity in both A549 and U373MG cell lines, and suggest that this effect might be associated with the inhibition of DNA repair.
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Affiliation(s)
- Hak Jae Kim
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Jin Ho Kim
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Eui Kyu Chie
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Park Da Young
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - In Ah Kim
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Il Han Kim
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
- Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Republic of Korea
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Sakagami H, Iwamoto S, Matsuta T, Satoh K, Shimada C, Kanamoto T, Terakubo S, Nakashima H, Morita Y, Ohkubo A, Tsuda T, Sunaga K, Kitajima M, Oizumi H, Oizumi T. Comparative study of biological activity of three commercial products of Sasa senanensis Rehder leaf extract. In Vivo 2012; 26:259-264. [PMID: 22351667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
BACKGROUND We have previously reported that alkaline extract of Sasa senanensis leaves (SE) has several biological activities characteristic of lignin-carbohydrate complex (LCC). In the present study, we compared the biological activity of three commercially available products of SE (products A, B and C). MATERIALS AND METHODS Cell viability of mock-infected, HIV-infected, UV-irradiated cells was determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide method. Radical intensity was determined by electron spin resonance spectroscopy. Cytochrome P-450 (CYP)3A4 activity was measured by β-hydroxylation of testosterone in human recombinant CYP3A4. RESULTS Product A is a pure SE that contains Fe(II)-chlorophyllin, whereas products B and C contain Cu(II)-chlorophyllin and less LCC. Product C is supplemented with ginseng and pine (Pinus densiflora) leaf extracts. Product A exhibited 5-fold higher anti-HIV, 4-fold higher anti-UV, 5-fold higher hydroxyl radical-scavenging, and 3-fold lower CYP3A4 inhibitory activities as compared to those of product B, and 5-fold higher, 1.5-fold higher, comparable, and 7-fold lower activities, respectively, as compared to those of product C. CONCLUSION The present study demonstrates for the first time the superiority of product A over products B and C, suggesting the beneficial role of LCC and Fe(II)-chlorophyllin.
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Affiliation(s)
- Hiroshi Sakagami
- Division of Pharmacology, Meikai University School of Dentistry, Sakado, Saitama, Japan.
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Abstract
Radiation therapy has been widely used for treating human cancers. However, cancer cells develop radioresistant phenotypes that decrease the efficacy of radiotherapy. Ionizing radiation (IR) induces the production of reactive oxygen species, which play an important role in apoptotic cell death. Therefore, radiation therapy combined with a sensitizer, which modulates cellular redox status, has the potential to enhance therapeutic efficacy in a variety of human cancers. Here, we investigated the radiosensitizing effects of ursolic acid (UA), a pentacyclic triterpenoid found in rosemary and holy basil. IR-induced apoptosis in cancer cell lines such as DU145, CT26 and B16F10 was significantly enhanced by UA, as reflected by DNA fragmentation, cellular redox status, mitochondrial dysfunction and modulation of apoptotic marker proteins. Additionally, UA combined with IR was also effective for inhibiting tumorigenesis in B16F10 melanoma cells implanted into mice. Taken together, these results suggest that applying UA together with IR may be an effective combination modality for treating cancer.
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Affiliation(s)
- Su Jin Koh
- School of Life Sciences and Biotechnology, College of Natural Sciences, Kyungpook National University, Taegu, Republic of Korea
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Ghosh S, Krishna M. Role of Rad52 in fractionated irradiation induced signaling in A549 lung adenocarcinoma cells. Mutat Res 2012; 729:61-72. [PMID: 22001234 DOI: 10.1016/j.mrfmmm.2011.09.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2011] [Revised: 09/22/2011] [Accepted: 09/27/2011] [Indexed: 05/31/2023]
Abstract
The effect of fractionated doses of γ-irradiation (2Gy per fraction over 5 days), as delivered in cancer radiotherapy, was compared with acute doses of 10 and 2Gy, in A549 cells. A549 cells were found to be relatively more radioresistant if the 10Gy dose was delivered as a fractionated regimen. Microarray analysis showed upregulation of DNA repair and cell cycle arrest genes in the cells exposed to fractionated irradiation. There was intense activation of DNA repair pathway-associated genes (DNA-PK, ATM, Rad52, MLH1 and BRCA1), efficient DNA repair and phospho-p53 was found to be translocated to the nucleus of A549 cells exposed to fractionated irradiation. MCF-7 cells responded differently in fractionated regimen. Silencing of the Rad52 gene in fractionated group of A549 cells made the cells radiosensitive. The above result indicated increased radioresistance in A549 cells due to the activation of Rad52 gene.
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Affiliation(s)
- Somnath Ghosh
- Radiation Biology and Health Sciences Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India.
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Wang XC, Tian LL, Tian J, Li D, Wang Y, Wu H, Zheng H, Meng AM. Overexpression of Cks1 increases the radiotherapy resistance of esophageal squamous cell carcinoma. J Radiat Res 2012; 53:72-78. [PMID: 22302047 DOI: 10.1269/jrr.11090] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
PURPOSES The Cks1 protein is a member of the highly conserved family of Cks/Suc1 proteins, which interact with Cdks, and was found to be an essential cofactor for efficient Skp2-dependent ubiquitination of p27. The present study was undertaken to examine the expression status of Cks1 in esophageal squamous cell carcinoma and its significance. MATERIALS AND METHODS The expression of Cks1 in 140 esophageal squamous cell carcinoma patients was examined by immunohistochemistry. The correlations between Cks1 expression and tumor clinicopathologic features were analyzed. The effects of Cks1 expression on radiotherapy results were also examined. RESULTS In the present study, we found that Cks1 is overexpressed in esophageal squamous cell carcinoma tissues. Elevated expression of Cks1 correlates significantly with tumor stage and positive lymph node metastasis (p < 0.05). Moreover, a significant negative correlation was found between Cks1 expression and the survival of patients who received radiotherapy (p < 0.05). At the molecular level, forced expression of Cks1 promotes the radio-resistance ability of EC9706 cells. Knockdown of Cks1 expression sensitizes cancer cells to radiation, and a wobble mutant of Cks1 that is resistant to Cks1 siRNA can rescue this effect. CONCLUSIONS These results demonstrate for the first time that overexpression of Cks1 correlates with the increased radiotherapy resistance of esophageal squamous cell carcinoma.
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Affiliation(s)
- Xiao-Chun Wang
- Tianjin Key Laboratory of Molecular Nuclear Medicine, Institute of Radiation Medicine, Chinese Academy of Medical Science, Tianjin, China.
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Zhang H, Li J, Wang YY, Meng AM, Liu Q, Wang L, Chen FH, Wang XC, Zhai ZB, Fu Y, Wang Q. Retinoblastoma 94 enhances radiation treatment of esophageal squamous cell carcinoma in vitro and in vivo. J Radiat Res 2012; 53:117-124. [PMID: 22302052 DOI: 10.1269/jrr.11051] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We performed the study to investigate whether adenovirus-mediated retinoblastoma 94 (RB94) gene transfer could enhance radiation treatment of esophageal squamous cell carcinoma (ESCC) in vitro and in vivo. ESCC cells (Kyse150 cell line) were cultivated in vitro and tumors originated from the cell line were propagated as xenografts in nude mice. Treatment with Ad-RB94 and/or ionizing radiation (IR) was carried out both in vitro and in vivo with Ad-LacZ control vector and blank control. Cell viability, cell cycle distribution, cell apoptosis, tumor growth and transfected gene expression were evaluated and tumor degeneration was analyzed. The data of quantification real-time PCR assays and immunohistochemistry staining using RB antibody indicated that RB94 was efficiently transfected into Kyse150 cells. In vitro, data of cell growth assay indicated that treatment with Ad-RB94 improved radiation treatment of Kyse150 cells. Tumor xenograft studies, pathological analysis of H.E. staining and Ki67 staining suggested transfecting RB94 enhanced tumor regression induced by radiation treatment in vivo. In addition, data of Annexin V, TUNEL and cell cycle distribution assays proposed combination treatment effectively induced cell apoptosis and cell cycle arresting in G2/M phase. In conclusion, transferring RB94 gene by the adenoviral vector enhances radiation treatment of ESCC.
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Affiliation(s)
- Heng Zhang
- Institute of Radiation Medicine, Peking Union Medical College, Chinese Academy of Medical Sciences, China
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Hong MN, Han NK, Lee HC, Ko YK, Chi SG, Lee YS, Gimm YM, Myung SH, Lee JS. Extremely low frequency magnetic fields do not elicit oxidative stress in MCF10A cells. J Radiat Res 2012; 53:79-86. [PMID: 22302048 DOI: 10.1269/jrr.11049] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The aim of this study was to determine whether extremely low frequency magnetic fields (ELF-MF) could affect intracellular reactive oxygen species (ROS) levels and antioxidant enzyme activity. After MCF10A human breast epithelial cells were exposed to 1 mT of 60 Hz ELF-MF for 4 hours, intracellular ROS level, superoxide dismutase (SOD) activity, and reduced to oxidized glutathione (GSH/GSSG) ratio were measured. The cells exposed to ELF-MF did not evidence statistically significant changes in the above-mentioned biological parameters as compared to either the incubator controls or sham-exposed cells. By way of contrast, the IR-exposed cells exhibited marked changes in ROS level, SOD activity, and GSH/GSSG ratio. When we assessed morphological changes and senescence-associated beta-galactosidase (SA-β-Gal) activity, only the IR-exposed cells were positive. According to our results, it could be concluded that ELF-MF has no effect on intracellular ROS level, SOD activity, and GSH/GSSG ratio under our exposure condition.
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Affiliation(s)
- Mi-Na Hong
- Division of Radiation Cancer Research, Korea Institute of Radiological & Medical Sciences, Seoul, Korea
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Shibamoto Y, Otsuka S, Iwata H, Sugie C, Ogino H, Tomita N. Radiobiological evaluation of the radiation dose as used in high-precision radiotherapy: effect of prolonged delivery time and applicability of the linear-quadratic model. J Radiat Res 2011; 53:1-9. [PMID: 21997195 DOI: 10.1269/jrr.11095] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Since the dose delivery pattern in high-precision radiotherapy is different from that in conventional radiation, radiobiological assessment of the physical dose used in stereotactic irradiation and intensity-modulated radiotherapy has become necessary. In these treatments, the daily dose is usually given intermittently over a time longer than that used in conventional radiotherapy. During prolonged radiation delivery, sublethal damage repair takes place, leading to the decreased effect of radiation. This phenomenon is almost universarily observed in vitro. In in vivo tumors, however, this decrease in effect can be counterbalanced by rapid reoxygenation, which has been demonstrated in a laboratory study. Studies on reoxygenation in human tumors are warranted to better evaluate the influence of prolonged radiation delivery. Another issue related to radiosurgery and hypofractionated stereotactic radiotherapy is the mathematical model for dose evaluation and conversion. Many clinicians use the linear-quadratic (LQ) model and biologically effective dose (BED) to estimate the effects of various radiation schedules, but it has been suggested that the LQ model is not applicable to high doses per fraction. Recent experimental studies verified the inadequacy of the LQ model in converting hypofractionated doses into single doses. The LQ model overestimates the effect of high fractional doses of radiation. BED is particularly incorrect when it is used for tumor responses in vivo, since it does not take reoxygenation into account. For normal tissue responses, improved models have been proposed, but, for in vivo tumor responses, the currently available models are not satisfactory, and better ones should be proposed in future studies.
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MESH Headings
- Animals
- Carcinoma, Squamous Cell/pathology
- Carcinoma, Squamous Cell/radiotherapy
- Cell Hypoxia
- Cell Line, Tumor/metabolism
- Cell Line, Tumor/radiation effects
- Dose Fractionation, Radiation
- Dose-Response Relationship, Radiation
- Female
- Humans
- Linear Models
- Mammary Neoplasms, Experimental/pathology
- Mammary Neoplasms, Experimental/radiotherapy
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C3H
- Models, Theoretical
- Neoplasms/metabolism
- Neoplasms/radiotherapy
- Neoplasms/surgery
- Oxygen/metabolism
- Radiation Pneumonitis/etiology
- Radiosurgery/adverse effects
- Radiosurgery/statistics & numerical data
- Radiotherapy Dosage
- Radiotherapy, Intensity-Modulated/statistics & numerical data
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Affiliation(s)
- Yuta Shibamoto
- Department of Radiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan.
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Xiang YZ, Wei LZ, Yu L, Gui P, Peng P, Xiong ZJ. [Effects of celecoxib combined with radiotherapy on apoptosis of CNE-2Z cell lines]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2011; 46:572-575. [PMID: 22088287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
OBJECTIVE To investigate the effects of celecoxib combined with radiotherapy on apoptosis of CNE-2Z cell lines and the potential mechanisms. METHODS Four groups were used, a control, celecoxib (25 micromol/L celecoxib), irradiation (8 Gy X ray) and celecoxib plus irradiation. The radiosensitising effect was detected by clone formation experiment. Flow cytometry was used to detect the apoptosis rate of cells. The expressions of Bcl-2 and Bax were assessed by immunocytochemistry. Western blot was used to examine the expression of Caspase-3. RESULTS Celecoxib enhanced the radiosensitivity of CNE-2Z cells. In experimental group, the mean surviving fraction and the mean lethal dose of CNE-2Z cells were 0.50 and 2.36 respectively. Compared with the irradiated group, there was significant differences between the two groups (P < 0.01). Celecoxib combined with radiotherapy up-regulation the expression of Bax. The score of the expression of Bax in the control group and the experimental group were 1.221 +/- 0.116 and 2.758 +/- 0.256 respectively. Celecoxib combined with radiotherapy could inhibit the expression of the protein of Bcl-2. The score of the expression of Bcl-2 in the control group and the experimental group were 2.559 +/- 0.144 and 1.253 +/- 0.114 respectively, with significant differences (P < 0.01). Celecoxib combined with radiotherapy could increase the apoptosis rate of tumor cells with significant differences (F = 7.63, P < 0.01). Western blot showed that the expression of Caspase-3 was strengthened. CONCLUSION Celecoxib combined with radiotherapy could induce apoptosis and enhance the radiosensitivity of human nasopharyngeal carcinoma CNE-2Z cell lines.
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Affiliation(s)
- Yi-zhou Xiang
- Department of Otorhinolaryngology, First Hospital of Yichang, Yichang 443000, China.
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Beucher A, Deckbar D, Schumann E, Krempler A, Frankenberg-Schwager M, Löbrich M. Elevated radiation-induced γH2AX foci in G2 phase heterozygous BRCA2 fibroblasts. Radiother Oncol 2011; 101:46-50. [PMID: 21665305 DOI: 10.1016/j.radonc.2011.05.043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2011] [Revised: 05/18/2011] [Accepted: 05/18/2011] [Indexed: 12/26/2022]
Abstract
BACKGROUND AND PURPOSE About 5-10% of all breast cancer cases are associated with heterozygous germ-line mutations in the genes encoding BRCA1 and BRCA2. Carriers of such mutations are highly predisposed for developing breast or ovarian cancer and, thus, are advised to undergo regular radio-diagnostic examinations. BRCA1 and BRCA2 are involved in multiple cellular processes including the repair of ionizing radiation (IR)-induced DNA double-strand breaks (DSBs) and different studies addressing the DSB repair capacity of BRCA1+/- or BRCA2+/- cells led to contradictory results. MATERIALS AND METHODS Using the sensitive method of γH2AX foci analysis in combination with cell cycle markers, we specifically measured DSB repair in confluent G0 as well as in exponentially growing G1 and G2 phase primary WT, BRCA1+/- and BRCA2+/- fibroblasts. RESULTS Both BRCA1+/- and BRCA2+/- cells displayed normal DSB repair in G0 and in G1. In contrast, in G2, BRCA2+/- but not BRCA1+/- cells exhibited a decreased DSB repair capacity which was in between that of WT and that of a hypomorphic BRCA2-/- cell line. CONCLUSIONS The residual amount of normal BRCA1 seems to be sufficient for efficient DSB repair in all cell cycle phases, while the decreased DSB repair capacity of heterozygous BRCA2 mutations suggests gene dosage effects in G2.
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Affiliation(s)
- Andrea Beucher
- Radiation Biology and DNA Repair, Darmstadt University of Technology, Germany
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Zheng ZF, Su HF, Zou Y, Peng Z, Wu SX. [Expression profiles of microRNAs in radioresistant esophageal cell line]. Zhonghua Yi Xue Za Zhi 2011; 91:639-642. [PMID: 21600139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
OBJECTIVE To identify the differential microRNA expression profiles of acquired radioresistant esophageal cell line established by fractionated ionizing radiation (FIR) versus parental cell line. METHODS MicroRNA microarray was employed for detection. Bioinformatic software tools were used to predict the target genes of identified microRNAs. For an understanding of miRNA functions, the GO analysis of abundantly differentially expressed targets of miRNAs was performed by GeneOntology Browser. RESULTS Compared with parental cell line, 10 microRNAs (hsa-miR-1539, hsa-miR-1237, hsa-miR-92b, etc.) were up-regulated over 2-fold and 25 microRNAs (hsa-miR-185, hsa-miR-18b, hsa-miR-17, etc.) down-regulated in KYSE-150R. Eighteen miRNAs had their target genes, 10 of them had the potential to individually target up to 200 mRNAs. Hsa-let-7a, hsa-miR-185, hsa-miR-141, hsa-miR-92b, hsa-miR-22 and hsa-miR-301a were known as important genes associated with radioresistance. CONCLUSION These results confirm the involvement of miRNA in radiation resistance. It may potentially help to explain the mechanisms of gene regulation in cellular response to radioresistance.
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Affiliation(s)
- Zhi-Fan Zheng
- First Affiliated Hospital, Wenzhou Medical College, Wenzhou 325000, China
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Tian YH, Xie GZ, Ren C, Sun QQ, Sun AM, Liu Y, Yuan YW. [Radiation-induced G2 phase arrest may contribute to the radioresistance of breast cancer stem cells]. Nan Fang Yi Ke Da Xue Xue Bao 2011; 31:53-56. [PMID: 21269956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
OBJECTIVE To investigate radiation-induced cell cycle changes of human breast cancer stem cells enriched by suspension culture. METHODS The tumorigenicity of human breast cancer stem cell line MCF-7 cultured in serum-free media was confirmed in NOD/SCID mice, and the radiosensitivity of the cells was tested by clone formation assay following radiation exposure. Flow cytometry was performed to evaluate radiation-induced cell cycle changes, and the protein expression of pCDC25C (ser216) was measured by Western blotting. RESULTS After the exposure to 2 Gy radiation, the survived fraction of the cells in suspension culture and those in adherent culture was 0.856 ∓ 0.061 and 0.783 ∓ 0.097, respectively, and the cells in suspension culture showed an obviously greater capacity of tumorigenicity in NOD/SCID mice. The radiation exposure resulted in an obvious increase in the proportion of G2 phase cells from (22.03 ∓ 2.12)% to (45.83 ∓ 2.25)% and significantly increased the expression of pCDC25C (ser216). CONCLUSION Radiation- induced G2 phase arrest may contribute to the resistance of the breast cancer stem cells to radiotherapy.
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Affiliation(s)
- Yun-hong Tian
- Department of Radiation Oncology, Southern Medical University, Guangzhou 510515, China.
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Mannerling AC, Simkó M, Mild KH, Mattsson MO. Effects of 50-Hz magnetic field exposure on superoxide radical anion formation and HSP70 induction in human K562 cells. Radiat Environ Biophys 2010; 49:731-41. [PMID: 20582429 DOI: 10.1007/s00411-010-0306-0] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2009] [Accepted: 06/07/2010] [Indexed: 05/19/2023]
Abstract
Epidemiological studies suggest a correlation between exposure to low-level extremely low-frequency (ELF) magnetic fields (MF) and certain cancers and neurodegenerative diseases. Experimental studies have not provided any mechanism for such effects, although at flux density levels significantly higher than the ones encountered in epidemiological studies, radical homoeostasis and levels of stress response proteins can be affected. Here, we report on the influence of MF exposure (50-Hz sine wave; 1 h; 0.025-0.10 mT; vertical or horizontal MF exposure direction) on different cellular parameters (proliferation, cell cycle distribution, superoxide radical anion, and HSP70 protein levels) in the human leukaemia cell line K562. The positive control heat treatment (42°C, 1 h) did not affect either cell proliferation or superoxide radical anion production but caused accumulation of cells in the G2 phase and increased the stress protein HSP70. MF exposure (0.10 mT, 1 h) did not affect either cell cycle kinetics or proliferation. Both vertical and horizontal MF exposures for 1 h caused significantly and transiently increased HSP70 levels (>twofold), at several flux densities, compared to sham controls and also compared to heat treatment. This exposure also increased (30-40%) the levels of the superoxide radical anion, comparable to the positive control PMA. Addition of free radical scavengers (melatonin or 1,10-phenantroline) inhibited the MF-induced increase in HSP70. In conclusion, an early response to ELF MF in K562 cells seems to be an increased amount of oxygen radicals, leading to HSP70 induction. Furthermore, the results suggest that there is a flux density threshold where 50-Hz MF exerts its effects on K562 cells, at or below 0.025 mT, and also that it is the MF, and not the induced electric field, which is the active parameter.
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Affiliation(s)
- Ann-Christine Mannerling
- Life Science Center, Academy of Natural Sciences and Technology, Orebro University, Orebro, Sweden
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Marthinsen ABL, Gisetstad R, Danielsen S, Frengen J, Strickert T, Lundgren S. Relative biological effectiveness of photon energies used in brachytherapy and intraoperative radiotherapy techniques for two breast cancer cell lines. Acta Oncol 2010; 49:1261-8. [PMID: 20735284 DOI: 10.3109/0284186x.2010.504226] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Partial breast irradiation (IORT or brachytherapy) differ from external radiation of whole breast in terms of irradiated volumes, fractionation, radiation energy and dose rate; all factors influencing the treatment outcome in a complex manner. Theoretically obtained RBE values comparing effects of radiation used in IORT and external therapy are published, but experimental studies are required to confirm these data. The aim of this study is to establish such RBE values for two breast cancer cell lines. MATERIALS AND METHODS Colony formation of breast cancer cell lines (MCF-7 and T-47D) were studied after photon irradiation with qualities and dose rates used in IORT, brachytherapy and external radiation. RBE values from survival data were used to compare effects. RESULTS Increasing the photon energy (dose rate 0.2 Gy/min) from 50 kV (Intrabeam) to 380 keV (¹⁹²Ir source) and 6 MV (linear accelerator) yielded an increase in the cell survival, whereas increasing the dose rate to 6 Gy/min had minor effect. Average RBE values for 50 kV with 6 MV as reference radiation varied from about 1.4 (for doses < 5 Gy) to > 1.9 (for doses < 0.02 Gy) for MCF-7 cells and from about 1.4 to > 3.1 for T-47D cells for the same dose levels. Corresponding RBE values for 380 keV radiation were about 1.4 for MCF-7 cells and 1.3-2.3 for T-47D cells. CONCLUSION RBE data for breast cancer cells exposed to radiation used in IORT, brachytherapy or external radiation differ among the cell lines tested. The values are in agreement with published theoretical and experimental work.
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Affiliation(s)
- Anne B L Marthinsen
- Department of Oncology, St. Olavs Hospital, Trondheim University Hospital, Norway.
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Kuwahara Y, Mori M, Oikawa T, Shimura T, Ohtake Y, Mori S, Ohkubo Y, Fukumoto M. The modified high-density survival assay is the useful tool to predict the effectiveness of fractionated radiation exposure. J Radiat Res 2010; 51:297-302. [PMID: 20410675 DOI: 10.1269/jrr.09094] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The high-density survival (HDS) assay was originally elaborated to assess cancer cell responses to therapeutic agents under the influence of intercellular communication. Here, we simplified the original HDS assay and studied its applicability for the detection of cellular radioresistance. We have recently defined clinically relevant radioresistant (CRR) cells, which continue to proliferate with daily exposure to 2 gray (Gy) of X-rays for more than 30 days in vitro. We established human CRR cell lines, HepG2-8960-R from HepG2, and SAS-R1 and -R2 from SAS, respectively. In an attempt to apply the HDS assay to detect radioresistance with clinical relevance, we simplified the original HDS assay by scoring the total number of surviving cells after exposure to X-rays. The modified HDS assay successfully detected radioresistance with clinical relevance. The modified HDS assay detected CRR phenotype, which is not always detectable by clonogenic assay. Therefore, we believe that the modified HDS assay presented in this study is a powerful tool to predict the effectiveness of fractionated radiotherapy against malignant tumors.
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Affiliation(s)
- Yoshikazu Kuwahara
- Department of Pathology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
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Abstract
Photodynamic therapy (PDT) uses a photosensitizer, light and oxygen to produce extensive oxidative damage to organelles housing the photosensitizer. Although PDT is an efficient trigger of apoptosis, it also induces autophagy in many kinds of cells. Autophagy can serve as both a cell survival and a cell death mechanism. Our previous study indicates that autophagy contributes to cell death after PDT, especially in apoptosis-deficient cells. Here, we provide further evidence to support the role of autophagy in cell killing after PDT. Autophagy was blocked by knockdown of one essential factor, LC3 or Atg7, in MCF-7 cells. The cells were exposed to a range of doses of PDT sensitized by the phthalocyanine Pc 4; steps in autophagy were monitored by western blotting for LC3-II and by fluorescence microscopy for the uptake of monodansylcadaverine or for the distribution of transfected GFP-LC3; and overall cell death was monitored by MTT assay and by clonogenic assay. We find that blocking autophagy increased the survival of MCF-7 cells after PDT and increased the shoulder on the dose-response curve. In response to Pc 4-PDT, Atg7-deficient MCF-7 cells remained capable of robust accumulation of LC3-II, but were defective in comparison to Atg7(+) cells in the formation of autophagosomes. We conclude that apoptosis-deficient cells rely on autophagy for cell death after Pc 4-PDT and that the strong activation of LC3 maturation in response to PDT could occur even in cells with limited or no Atg7 expression.
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Affiliation(s)
| | | | - Nancy L. Oleinick
- Department of Radiation Oncology; Cleveland, OH USA
- The Case Comprehensive Cancer Center; Case Western Reserve University School of Medicine; Cleveland, OH USA
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Kim KB, Byun HO, Han NK, Ko YG, Choi HD, Kim N, Pack JK, Lee JS. Two-dimensional electrophoretic analysis of radio-frequency radiation-exposed MCF7 breast cancer cells. J Radiat Res 2010; 51:205-213. [PMID: 20339255 DOI: 10.1269/jrr.09030] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Although many in vitro studies have previously been conducted to elucidate the biological effects of radio frequency (RF) radiation over the past decades, the existence and nature of any effects is still inconclusive. In an effort to further elucidate this question, we have monitored changes in protein expression profiles in RF-exposed MCF7 human breast cancer cells using two-dimensional gel electrophoresis. MCF7 cells were exposed to 849 MHz RF radiation for 1 h per day for three consecutive days at specific absorption rates (SARs) of either 2 W/Kg or 10 W/kg. During exposure, the temperature in the exposure chamber was kept in an isothermal condition. Twenty-four hours after the final RF exposure, the protein lysates from MCF cells were prepared and two-dimensional electrophoretic analyses were conducted. The protein expression profiles of the MCF cells were not significantly altered as the result of RF exposure. None of the protein spots on the two-dimensional electrophoretic gels showed reproducible changes in three independent experiments. To determine effect of RF radiation on protein expression profiles more clearly, three spots showing altered expression without reproducibility were identified using electrospray ionization tandem mass spectrometry analysis and their expressions were examined with RT-PCR and Western blot assays. There was no alteration in their mRNA and protein levels. As we were unable to observe any significant and reproducible changes in the protein expression profiles of the RF radiation-exposed MCF7 cells using high throughput and non-high throughput techniques, it seems unlikely that RF exposure modulates the protein expression profile.
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MESH Headings
- Adenocarcinoma/chemistry
- Adenocarcinoma/pathology
- Blotting, Western
- Breast Neoplasms/chemistry
- Breast Neoplasms/pathology
- Cell Line, Tumor/chemistry
- Cell Line, Tumor/radiation effects
- Cell Phone
- Electrophoresis, Gel, Two-Dimensional
- Female
- Gene Expression Regulation, Neoplastic/radiation effects
- Humans
- Neoplasm Proteins/analysis
- Neoplasm Proteins/biosynthesis
- Neoplasm Proteins/genetics
- RNA, Messenger/analysis
- RNA, Neoplasm/analysis
- Radio Waves
- Reproducibility of Results
- Reverse Transcriptase Polymerase Chain Reaction
- Spectrometry, Mass, Electrospray Ionization
- Tandem Mass Spectrometry
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Affiliation(s)
- Ki-Bum Kim
- School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
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