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Routila J, Suvila K, Grénman R, Leivo I, Westermarck J, Ventelä S. Cancer cell line microarray as a novel screening method for identification of radioresistance biomarkers in head and neck squamous cell carcinoma. BMC Cancer 2021; 21:868. [PMID: 34320941 PMCID: PMC8320194 DOI: 10.1186/s12885-021-08618-6] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 07/15/2021] [Indexed: 11/23/2022] Open
Abstract
Background Currently, no clinically useful biomarkers for radioresistance are available in head and neck squamous cell carcinoma (HNSCC). This study assesses the usefulness of Cell Line Microarray (CMA) method to enhance immunohistochemical screening of potential immunohistochemical biomarkers for radioresistance in HNSCC cell lines. Methods Twenty-nine HNSCC cell lines were cultured, cell pellets formalin-fixed, paraffin-embedded, and arrayed. Radioresistance features of the cell lines were combined to immunohistochemical stains for p53, NDFIP1, EGFR, stem cell marker Oct4, and PP2A inhibitor CIP2A. Results Expression of p53, EGFR or CIP2A did not indicate intrinsic radioresistance in vitro. Stem cell marker Oct4 nuclear positivity and NDFIP1 nuclear positivity was correlated with increased intrinsic radioresistance. Conclusion The usefulness of CMA in analysis of HNSCC cell lines and discovery of biomarkers is demonstrated. CMA is very well adapted to both testing of antibodies in a large panel of cell lines as well as correlating staining results with other cell line characteristics. In addition, CMA-based antibody screening proved an efficient and relatively simple method to identify potential radioresistance biomarkers in HNSCC. Supplementary Information The online version contains supplementary material available at 10.1186/s12885-021-08618-6.
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Affiliation(s)
- Johannes Routila
- Turku Bioscience Centre, University of Turku and Åbo Akademi university, Turku, Finland.,Department for Otorhinolaryngology - Head and Neck Surgery, Turku University Hospital and University of Turku, Kiinamyllynkatu 4-8, 20521, Turku, Finland.,Department for Otorhinolaryngology, Satakunta Central Hospital, Pori, Finland
| | - Karri Suvila
- Turku Bioscience Centre, University of Turku and Åbo Akademi university, Turku, Finland
| | - Reidar Grénman
- Department for Otorhinolaryngology - Head and Neck Surgery, Turku University Hospital and University of Turku, Kiinamyllynkatu 4-8, 20521, Turku, Finland
| | - Ilmo Leivo
- Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, 20520, Turku, Finland
| | - Jukka Westermarck
- Turku Bioscience Centre, University of Turku and Åbo Akademi university, Turku, Finland.,Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, 20520, Turku, Finland
| | - Sami Ventelä
- Turku Bioscience Centre, University of Turku and Åbo Akademi university, Turku, Finland. .,Department for Otorhinolaryngology - Head and Neck Surgery, Turku University Hospital and University of Turku, Kiinamyllynkatu 4-8, 20521, Turku, Finland. .,Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, 20520, Turku, Finland.
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Liu M, Lee S, Liu B, Wang H, Dong L, Wang Y. Ku-dependent non-homologous end-joining as the major pathway contributes to sublethal damage repair in mammalian cells. Int J Radiat Biol 2015; 91:867-871. [PMID: 26189733 DOI: 10.3109/09553002.2015.1075178] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE Sublethal damage repair (SLDR) is a type of repair that occurs in split-dose irradiated cells, which was discovered more than 50 years ago. However, due to conflicting reported data, it remains unclear which DNA double-strand break (DSB) repair pathway, non-homologous end-joining (NHEJ) repair, homologous recombination repair (HRR) or both, contributes to SLDR, particularly in human cells. We were interested in clarifying this question. METHODS AND MATERIALS Mammalian cell lines, including human, mouse and Chinese hamster ovary (CHO) cell lines, wild type, deficient in NHEJ or HRR were irradiated with either single dose or two split doses at 2- or 4-h intervals. The clonogenic assay was used to evaluate these cell radiosensitivities. RESULTS All wild-type or HRR-deficient cells (including human, mouse and CHO cells) showed a higher survival rate after exposure to split-dose versus single-dose radiation; however, all classical NHEJ-deficient cells (including human, mouse and hamster cells) did not show any apparent sensitivity changes between single-dose and split-dose irradiation. CONCLUSION Classical NHEJ mainly contributes to SLDR in mammalian cells (including human cells). These results have the potential to improve radiotherapy.
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Affiliation(s)
- Min Liu
- Department of Radiation Oncology, the First Hospital, Jilin University, Changchun, 130021, China.,Department of Radiation Oncology, School of Medicine and the Winship Cancer Institute of Emory University, Atlanta, GA 30322, USA
| | - Solah Lee
- Department of Radiation Oncology, School of Medicine and the Winship Cancer Institute of Emory University, Atlanta, GA 30322, USA
| | - Bailong Liu
- Department of Radiation Oncology, the First Hospital, Jilin University, Changchun, 130021, China.,Department of Radiation Oncology, School of Medicine and the Winship Cancer Institute of Emory University, Atlanta, GA 30322, USA
| | - Hongyan Wang
- Department of Radiation Oncology, School of Medicine and the Winship Cancer Institute of Emory University, Atlanta, GA 30322, USA
| | - Lihua Dong
- Department of Radiation Oncology, the First Hospital, Jilin University, Changchun, 130021, China
| | - Ya Wang
- Department of Radiation Oncology, School of Medicine and the Winship Cancer Institute of Emory University, Atlanta, GA 30322, USA
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Ventelä S, Sittig E, Mannermaa L, Mäkelä JA, Kulmala J, Löyttyniemi E, Strauss L, Cárpen O, Toppari J, Grénman R, Westermarck J. CIP2A is an Oct4 target gene involved in head and neck squamous cell cancer oncogenicity and radioresistance. Oncotarget 2015; 6:144-58. [PMID: 25474139 PMCID: PMC4381584 DOI: 10.18632/oncotarget.2670] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Accepted: 11/02/2014] [Indexed: 12/31/2022] Open
Abstract
Radiotherapy is a mainstay for treatment of many human cancer types, including head and neck squamous cell carcinoma (HNSCC). Thereby, it is clinically very relevant to understand the mechanisms determining radioresistance. Here, we identify CIP2A as an Oct4 target gene and provide evidence that they co-operate in radioresistance. Oct4 positively regulates CIP2A expression both in testicular cancer cell lines as well as in embryonic stem cells. To expand the relevance of these findings we show that Oct4 and CIP2A are co-expressed in CD24 positive side-population of patient-derived HNSCC cell lines. Most importantly, all Oct4 positive HNSCC patient samples were CIP2A positive and this double positivity was linked to poor differentiation level, and predicted for decreased patient survival among radiotherapy treated HNSCC patients. Oct4 and CIP2A expression was also linked with increased aggressiveness and radioresistancy in HNSCC cell lines. Together we demonstrate that CIP2A is a novel Oct4 target gene in stem cells and in human cancer cell lines. Clinically these results suggest that diagnostic evaluation of HNSCC tumors for Oct4 or Oct4/CIP2A positivity might help to predict HNSCC tumor radioresistancy. These results also identify both Oct4 and CIP2A as potential targets for radiosensitation.
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Affiliation(s)
- Sami Ventelä
- Turku Centre for Biotechnology, University of Turku and Åbo Akademi, Turku, Finland. Department of Physiology, University of Turku, Finland. Department of Otorhinolaryngology - Head and Neck Surgery, Turku University Hospital, Turku, Finland
| | - Eleonora Sittig
- Turku Centre for Biotechnology, University of Turku and Åbo Akademi, Turku, Finland
| | - Leni Mannermaa
- Turku Centre for Biotechnology, University of Turku and Åbo Akademi, Turku, Finland
| | | | - Jarmo Kulmala
- Department of Oncology and Radiotherapy, Turku University Hospital, Turku, Finland
| | | | - Leena Strauss
- Institute of Biomedicine and Turku Center for Disease Modeling, University of Turku, Finland
| | - Olli Cárpen
- Department of Pathology, University of Turku, Finland
| | - Jorma Toppari
- Department of Physiology, University of Turku, Finland. Department of Pediatrics, Turku University Hospital, Turku, Finland
| | - Reidar Grénman
- Department of Otorhinolaryngology - Head and Neck Surgery, Turku University Hospital, Turku, Finland
| | - Jukka Westermarck
- Turku Centre for Biotechnology, University of Turku and Åbo Akademi, Turku, Finland. Department of Pathology, University of Turku, Finland
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Wilson GD, Marples B, Galoforo S, Geddes TJ, Thibodeau BJ, Grénman R, Akervall J. Isolation and genomic characterization of stem cells in head and neck cancer. Head Neck 2012; 35:1573-82. [PMID: 23108794 DOI: 10.1002/hed.23184] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/12/2012] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND This study investigated the use of 3 different established cell-sorting strategies to isolate and characterize stem cells from head and neck cancer cell lines. METHODS Five low-passage cell lines were subjected to cell sorting based on Hoechst side population, Aldefluor, and CD44 expression. Isolated cell populations were studied for gene expression, radiosensitivity, and chemosensitivity to cisplatin and paclitaxel. RESULTS Each sorting method identified a different set of genes associated with different gene ontology categories, with mitosis being the only common category. CD44-associated gene changes were almost exclusively associated with cell cycle and in particular mitosis. There were no significant differences in radiosensitivity or cisplatin sensitivity of stem or non-stem cells, but CD44-isolated stem cells were more resistant to paclitaxel. CONCLUSIONS This study suggested that CD44 may be the most promising cell-sorting strategy to isolate and investigate the impact of stem cells in head and neck squamous cell cancer (HNSCC).
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Affiliation(s)
- George D Wilson
- Department of Radiation Oncology, William Beaumont Hospital, Royal Oak, Michigan; Beaumont BioBank, William Beaumont Hospital, Royal Oak, Michigan
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Kurvinen K, Rantanen V, Syrjänen S, Johansson B. Radiation-induced effects on telomerase in gynecological cancer cell lines with different radiosensitivity and repair capacity. Int J Radiat Biol 2009; 82:859-67. [PMID: 17178626 DOI: 10.1080/09553000600969812] [Citation(s) in RCA: 6] [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] [Indexed: 12/31/2022]
Abstract
PURPOSE Telomerase activation in response to irradiation might enhance the radioresistance of cells. Thus, we have investigated radiation-induced effects on telomerase in six gynecological cancer cell lines, with different intrinsic radiosensitivity and capacity for sublethal damage repair (SLDR). MATERIALS AND METHODS Three endometrial adenocarcinoma (UM-EC-1, UT-EC-2B and UT-EC-3) and three vulvar squamous cell carcinoma (A431, UM-SCV-2 and UM-SCV-7) cell lines were irradiated with doses of 5, 10 and 25 Gy and the effects on telomerase were evaluated at 0.5, 6, 24 and 48 h post-irradiation. Telomerase activity was quantitatively measured by SYBR Green real-time telomeric repeat amplification protocol. RESULTS The most radioresistant cell line A431 had the strongest stimulatory effects (approximately 2.0 - 2.5-fold) on telomerase activity 24 and 48 h post-irradiation with the highest radiation doses. In contrast to that, telomerase activities in the highly radiosensitive cell line UT-EC-2B remained below the basal level throughout the 48-h period of post-irradiation with the highest doses, and even a decline to approximately 50% of the basal level was found 24 h after exposure. In other cell lines being either moderately or highly radiation resistant, telomerase activity levels in response to irradiation remained mainly at the basal level or gradually increased. CONCLUSIONS The present findings indicate that there might be a connection between the radiation-induced telomerase response and radiosensitivity. However, no correlation was found between the radiation-induced effects on telomerase and the sublethal damage repair capacity of the cells.
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Affiliation(s)
- Kaisa Kurvinen
- Department of Oral Pathology and Oral Radiology, Institute of Dentistry and MediCity Research Laboratory, Faculty of Medicine, University of Turku, Turku, Finland
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Ueta E, Sasabe E, Yang Z, Osaki T, Yamamoto T. Enhancement of apoptotic damage of squamous cell carcinoma cells by inhibition of the mitochondrial DNA repairing system. Cancer Sci 2008; 99:2230-7. [DOI: 10.1111/j.1349-7006.2008.00918.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Hoffmann TK, Sonkoly E, Hauser U, van Lierop A, Whiteside TL, Klussmann JP, Hafner D, Schuler P, Friebe-Hoffmann U, Scheckenbach K, Erjala K, Grénman R, Schipper J, Bier H, Balz V. Alterations in the p53 pathway and their association with radio- and chemosensitivity in head and neck squamous cell carcinoma. Oral Oncol 2008; 44:1100-9. [PMID: 18487078 DOI: 10.1016/j.oraloncology.2008.02.006] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2008] [Revised: 02/14/2008] [Accepted: 02/15/2008] [Indexed: 11/30/2022]
Abstract
Chemotherapy and/or radiotherapy are established measures in treatment protocols of head and neck squamous cell carcinoma (HNSCC). However, we still lack reliable predictive markers for the response to radio- and chemotherapy. The p53 pathway is involved in stress response and thus might influence chemo-/radiosensitivity. Using 29 HNSCC cell lines previously characterized for p53 mutations, we simultaneously analyzed several key players in the p53 pathway by RT-PCR, transcript sequencing and immunohistochemistry, and investigated their association with chemosensitivity and radiosensitivity. Cell lines with p53 mutations were slightly more sensitive to cisplatin than those with wild-type p53. The type of mutation did not influence radio- or chemosensitivity. p14(ARF), an activator of p53, was lost or mutated in all cell lines. Three cell lines showed overexpression of HDM-2, a major negative regulator of p53; however, HDM-2 levels did not correlate with radio- or chemosensitivity. HPV-16 oncoproteins were detected in one highly chemoresistant cell line. Our findings suggest that molecular events resulting in the inactivation of the p53 pathway occur in all HNSCC cell lines. However, single alterations in the p53 pathway are not reliable predictors for the response to radio- or chemotherapy in HNSCC.
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Affiliation(s)
- Thomas K Hoffmann
- Department of Otorhinolaryngology, Heinrich-Heine-University Düsseldorf, Moorenstrasse 5, D-40225 Düsseldorf, Germany.
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Ryan LA, Smith RW, Seymour CB, Mothersill CE. Dilution of irradiated cell conditioned medium and the bystander effect. Radiat Res 2008; 169:188-96. [PMID: 18220470 DOI: 10.1667/rr1141.1] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2007] [Accepted: 11/06/2007] [Indexed: 11/03/2022]
Abstract
While nontargeted and low-dose effects such as the bystander effect are now accepted, the mechanisms underlying the response have yet to be elucidated. It has been shown that the transfer of irradiated cell conditioned medium (ICCM) can kill cells that are not directly irradiated; however, to date the effect of ICCM concentration on cell killing has not been reported. The occurrence of a bystander effect was determined by measuring cell survival after exposure to various ICCM dilutions, using the colony-forming assay, in cells of six human cell lines with varied bystander responses and tumor/ p53 status. Autologous ICCM transfer for these cell lines induced a bystander effect as reported previously. ICCM from these cell lines was transferred to cells of a common reporter cell line (HPV-G) to investigate whether the lack of an induced bystander effect was due to their inability to generate or to respond to a bystander signal(s). ICCM from cells of four cell lines induced a bystander effect in HPV-G reporter cells, confirming that signal production is a critical factor. A saturation response was observed when ICCM was diluted. Survival was found to increase linearly until a plateau was reached and the bystander effect was abolished at 2x dilution. The effect of ICCM from the different cell lines reached a plateau at different dilutions, which were found to correlate with the cell line's radiosensitivity.
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Affiliation(s)
- Lorna A Ryan
- Medical Physics and Applied Radiation Sciences Department, McMaster University, Hamilton, Ontario, Canada L8S 4K1
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Liu Y, Nakahara T, Miyakoshi J, Hu DL, Nakane A, Abe Y. Nuclear accumulation and activation of nuclear factor kappaB after split-dose irradiation in LS174T cells. J Radiat Res 2007; 48:13-20. [PMID: 17038805 DOI: 10.1269/jrr.0615] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Although radiation-induced gene expression has been extensively studied, most of the studies to date have focused on that after single-dose irradiation. As split-dose irradiation, rather than single-dose irradiation, is usual in clinical situations, we investigated the effects of split-dose irradiation on nuclear factor kappaB (NF-kappaB) in the human rectum carcinoma cell line, LS174T. After either single- or split-dose irradiation with a different interval, nuclear localization of NF-kappaB was examined by Western blot and immunofluorescence and its DNA-binding activity was measured by ELISA-based assay. Irradiation-induced NF-kappaB nuclear accumulation and DNA binding activity increased in a dose-dependent manner. The peak of NF-kappaB nuclear accumulation and DNA binding activity was seen 2 to 6 hours after a single dose of 4 Gy irradiation and returned to control levels after 12 hours. In split-dose irradiation, NF-kappaB activity was similar after the first and second doses of 4 Gy irradiation separated by 12 hours. In addition, NF-kappaB activity was decreased by lengthening the interval between irradiation. The cell survival, which was assessed by colony formation assay, showed inverse correlation to this: the surviving fraction was higher after split-dose irradiation than after single-dose irradiation of the same total dose and it increased as the interval between irradiation was lengthened. Thus the present results showed a correlation between NF-kappaB activation and the repair of sublethal damage in split-dose irradiation.
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Affiliation(s)
- Yong Liu
- Department of Radiology, School of Medicine, Hirosaki University, Japan
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Mandic R, Schamberger CJ, Müller JF, Geyer M, Zhu L, Carey TE, Grénman R, Dünne AA, Werner JA. Reduced Cisplatin Sensitivity of Head and Neck Squamous Cell Carcinoma Cell Lines Correlates with Mutations Affecting the COOH-Terminal Nuclear Localization Signal of p53. Clin Cancer Res 2005; 11:6845-52. [PMID: 16203773 DOI: 10.1158/1078-0432.ccr-05-0378] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [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: 11/16/2022]
Abstract
PURPOSE Head and neck squamous cell carcinomas (HNSCC) are the most frequent malignancies of the upper aerodigestive tract. Cisplatin resistance is a major problem in the treatment of a large number of HNSCC cancer patients. In this study, nine randomly selected HNSCC cell lines were investigated regarding expression, presence of mutations, nucleocytoplasmic distribution of p53, and sensitivity to cisplatin. EXPERIMENTAL DESIGN Protein expression was evaluated by Western blot analysis. The whole open reading frame of p53 was determined by reverse transcription-PCR sequencing. Nucleocytoplasmic distribution was evaluated by confocal laser scanning microscopy. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide viability assay was used to test for cisplatin sensitivity. RESULTS p53 mutations were found in all nine investigated HNSCC cell lines. Nuclear p53 signal was detected in six cell lines, whereas three cell lines exhibited total loss of nuclear p53 signal. Nuclear signal depended on the presence or absence of the COOH-terminal nuclear localization signal in p53. Cisplatin sensitivity was highly reduced in the group with loss of nuclear p53 signal compared with those with detectable nuclear signal. Transfection of wild-type and mutant p53 into a rat embryonic cell system showed highly reduced activity of the nuclear localization signal mutant p53 protein. CONCLUSION Taken together, these data suggest that "loss of nuclear p53 signal" correlates with cisplatin resistance in HNSCC. If these results can be validated on a larger number of tumor samples, including fresh tumor tissues, it potentially could help in sparing a subgroup of HNSCC patients the side effects associated with unnecessary chemotherapy by identifying cisplatin nonresponders before chemotherapy induction.
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MESH Headings
- Adult
- Aged
- Animals
- Blotting, Western
- Cell Line
- Cell Line, Tumor
- Cell Nucleus/metabolism
- Cisplatin/pharmacology
- Cloning, Molecular
- Coloring Agents/pharmacology
- Cyclin-Dependent Kinase Inhibitor p21/metabolism
- Cytoplasm/metabolism
- Dose-Response Relationship, Drug
- Drug Resistance, Neoplasm
- Electrophoresis, Polyacrylamide Gel
- Genes, p53/genetics
- Head and Neck Neoplasms/genetics
- Humans
- Immunohistochemistry
- Microscopy, Confocal
- Middle Aged
- Models, Molecular
- Mutation
- Nuclear Localization Signals
- Open Reading Frames
- Protein Structure, Tertiary
- Rats
- Reverse Transcriptase Polymerase Chain Reaction
- Tetrazolium Salts/pharmacology
- Thiazoles/pharmacology
- Transcription, Genetic
- Transfection
- Tumor Suppressor Protein p53/metabolism
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Affiliation(s)
- Robert Mandic
- Department of Otolaryngology/Head and Neck Surgery, University of Marburg, Marburg, Germany.
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Haikonen J, Rantanen V, Pekkola K, Kulmala J, Grénman R. Does skin fibroblast radiosensitivity predict squamous cancer cell radiosensitivity of the same individual? Int J Cancer 2003; 103:784-8. [PMID: 12516099 DOI: 10.1002/ijc.10890] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [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: 11/05/2022]
Abstract
Individualization of radiation doses is presumed to result in better radiotherapy outcome. Success rate in measuring radiosensitivity is probably the most limiting factor for present radiosensitivity assays to be introduced into clinical routine. To find a simpler predictive parameter, we compared the radiosensitivity of dermal fibroblasts and head and neck squamous cell carcinoma (SCC) cell lines established from the same individuals. The radiosensitivity was tested using the clonogenic 96-well plate assay. The surviving fraction at 2.0 Gy (SF2) was determined, as well as the mean inactivation dose (AUC) of cancer cells. SF2 of SCC cell lines and skin fibroblasts were 0.25-0.44 and 0.11-0.43, respectively. AUC of SCC cells was 1.4-2.1 Gy. Dermal fibroblasts were more radiosensitive than SCC cells in 14 of 15 cases. In 1 patient (UT-SCC-8), cancer cells were found to be more radiosensitive than corresponding dermal fibroblasts. There was a clear tendency to a correlation between radiosensitivities of these 2 cell types, but statistical significance was reached only when the data of UT-SCC-8 was excluded. In our material, the intrinsic radiosensitivity of head and neck SCC cells could in most cases be predicted from the intrinsic radiosensitivity of dermal fibroblasts established from the same individual.
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Affiliation(s)
- Johanna Haikonen
- Department of Obstetrics and Gynaecology, The University of Turku, Turku, Finland
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Honda N, Yagi K, Ding GR, Miyakoshi J. Radiosensitization by overexpression of the nonphosphorylation form of IkappaB-alpha in human glioma cells. J Radiat Res 2002; 43:283-292. [PMID: 12518988 DOI: 10.1269/jrr.43.283] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
To assess the role of NF-kappaB in cellular radiosensitivity, we constructed mutated IkappaB expression plasmids for SY-IkappaB (with mutations at residues of 32, 36 and 42) expression in human malignant glioma cells (radiosensitive MO54 and radioresistant T98 cells), giving respective cell types referred to as MO54-SY4 and T98-SY14. Both of the clones expressing SY-IkappaB became radiosensitive, compared with the parental MO54 and T98 cells. A treatment with herbimycin A or genistein did not change the radiosensitivity of cells expressing SY-IkappaB, but made both the MO54 and T98 parental cells more sensitive to ionizing radiation. A treatment with TNF-alpha induced DNA fragmentation and apoptosis in cells expressing SY-IkappaB, but not in MO54 and T98 cells. The survival after X-ray exposure of the parental MO54 cells was slightly increased by a TNF-alpha treatment, but that of the parental T98 cells did not change. The change in sensitivity to ultra-violet (UV) radiation and adriamycin in MO54-SY4 cells was very similar to that for X-ray sensitivity, but no change was observed in T98-SY14 cells. Significant sublethal damage repair was observed in T98 cells, whereas MO54 cells showed little repair activity. The expression of p53 was enhanced in the parental MO54 cells, while the p53 levels in the MO54-SY4, and in the parent and clonal T98 cells, did not change. Our data suggest that the serine and tyrosine phosphorylation of IkappaB-alpha may play a role in determining the radiosensitivity of malignant glioma cells.
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Affiliation(s)
- Naoko Honda
- Department Radiation Genetics, Graduate School of Medicine, Kyoto University, Yoshida-Konoe-cho, Sakyo-Ku, Kyoto 606-8501, Japan
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