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Thielhelm TP, Goncalves S, Welford SM, Mellon EA, Cohen ER, Nourbakhsh A, Fernandez-Valle C, Telischi F, Ivan ME, Dinh CT. Understanding the Radiobiology of Vestibular Schwannomas to Overcome Radiation Resistance. Cancers (Basel) 2021; 13:4575. [PMID: 34572805 PMCID: PMC8467596 DOI: 10.3390/cancers13184575] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 09/06/2021] [Accepted: 09/06/2021] [Indexed: 12/12/2022] Open
Abstract
Vestibular schwannomas (VS) are benign tumors arising from cranial nerve VIII that account for 8-10% of all intracranial tumors and are the most common tumors of the cerebellopontine angle. These tumors are typically managed with observation, radiation therapy, or microsurgical resection. Of the VS that are irradiated, there is a subset of tumors that are radioresistant and continue to grow; the mechanisms behind this phenomenon are not fully understood. In this review, the authors summarize how radiation causes cellular and DNA injury that can activate (1) checkpoints in the cell cycle to initiate cell cycle arrest and DNA repair and (2) key events that lead to cell death. In addition, we discuss the current knowledge of VS radiobiology and how it may contribute to clinical outcomes. A better understanding of VS radiobiology can help optimize existing treatment protocols and lead to new therapies to overcome radioresistance.
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Affiliation(s)
- Torin P Thielhelm
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Stefania Goncalves
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Scott M Welford
- Department of Radiation Oncology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Eric A Mellon
- Department of Radiation Oncology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Erin R Cohen
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Aida Nourbakhsh
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Cristina Fernandez-Valle
- Burnett School of Biomedical Sciences, University of Central Florida College of Medicine, Orlando, FL 32816, USA
| | - Fred Telischi
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Michael E Ivan
- Department of Neurological Surgery, University of Miami Miller School of Medicine, Miami, FL 33136, USA
| | - Christine T Dinh
- Department of Otolaryngology, University of Miami Miller School of Medicine, Miami, FL 33136, USA
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Li J, Li H, Zhan D, Xiang M, Yang J, Zuo Y, Yu Y, Zhou H, Jiang D, Luo H, Chen Z, Yu Z, Xu Z. Niclosamide sensitizes nasopharyngeal carcinoma to radiation by downregulating Ku70/80 expression. J Cancer 2018; 9:736-744. [PMID: 29556331 PMCID: PMC5858495 DOI: 10.7150/jca.20963] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 12/13/2017] [Indexed: 02/06/2023] Open
Abstract
The aim of the present study was to investigate whether niclosamide could sensitize the nasopharyngeal carcinoma cells to radiation and further explore the underlying mechanisms. CCK-8 assay was used to determine the effect of niclosamide on the proliferation of NPC cells. Colony formation assay was used to evaluate the radiosensitizing effect of niclosamide on NPC cells. Flow cytometry analysis was used to determine the apoptosis of NPC cells induced by niclosamide. Immunofluorescent staining was used to detect the formation of γ-H2AX foci and the localization of Ku70/80 proteins in NPC cells. Real-time PCR quantification analysis was used to examine the level of Ku70/80 mRNA. DNA damage repair-related proteins were detected by western blot analysis. Our results showed that niclosamide markedly suppressed the proliferation of NPC cells. Niclosamide pretreatment followed by irradiation reduced the colony forming ability of NPC cells. Niclosamide in combination with irradiation significantly increased the apoptotic rate of NPC cells. Niclosamide significantly reduced the transcriptional level of K70/80 but not the translocation of Ku70/80 protein induced by irradiation. In conclusion, our study demonstrated that niclosamide could inhibit the growth of NPC cells and sensitize the NPC cells to radiation via suppressing the transcription of Ku70/80.
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Affiliation(s)
- Jingjing Li
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
| | - Haiwen Li
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
| | - Dechao Zhan
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
| | - Mei Xiang
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
| | - Jun Yang
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
| | - Yufang Zuo
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
| | - Yin Yu
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
| | - Hechao Zhou
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
| | - Danxian Jiang
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
| | - Haiqing Luo
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
| | - Zihong Chen
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
| | - Zhonghua Yu
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
| | - Zumin Xu
- Cancer Center, Affiliated Hospital of Guangdong Medical University, Zhanjiang 524000, Guangdong Province, China
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Programming of Cell Resistance to Genotoxic and Oxidative Stress. Biomedicines 2018; 6:biomedicines6010005. [PMID: 29301323 PMCID: PMC5874662 DOI: 10.3390/biomedicines6010005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2017] [Revised: 12/23/2017] [Accepted: 12/31/2017] [Indexed: 12/23/2022] Open
Abstract
Different organisms, cell types, and even similar cell lines can dramatically differ in resistance to genotoxic stress. This testifies to the wide opportunities for genetic and epigenetic regulation of stress resistance. These opportunities could be used to increase the effectiveness of cancer therapy, develop new varieties of plants and animals, and search for new pharmacological targets to enhance human radioresistance, which can be used for manned deep space expeditions. Based on the comparison of transcriptomic studies in cancer cells, in this review, we propose that there is a high diversity of genetic mechanisms of development of genotoxic stress resistance. This review focused on possibilities and limitations of the regulation of the resistance of normal cells and whole organisms to genotoxic and oxidative stress by the overexpressing of stress-response genes. Moreover, the existing experimental data on the effect of such overexpression on the resistance of cells and organisms to various genotoxic agents has been analyzed and systematized. We suggest that the recent advances in the development of multiplex and highly customizable gene overexpression technology that utilizes the mutant Cas9 protein and the abundance of available data on gene functions and their signal networks open new opportunities for research in this field.
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Role of Radiotherapy in the Treatment of Renal Cell Cancer: Updated and Critical Review. TUMORI JOURNAL 2017; 103:504-510. [DOI: 10.5301/tj.5000640] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/18/2017] [Indexed: 12/22/2022]
Abstract
Purpose The growing incidence of renal cell carcinoma (RCC) raises many questions about the management of these patients. The late clinical presentation, the presence of locally advanced or metastatic disease at diagnosis, the difficulty of radical surgical excision, and radioresistance make it one of the more challenging tumors to treat. The primary objective of this article is to propose an updated and critical review of the role of radiotherapy (RT) in the treatment of RCC. Methods This literature review is based on data from meta-analyses and randomized, prospective, and retrospective studies. We collected reports from 1970 to the present about preoperative RT, postoperative RT, stereotactic body RT, radiosurgery, and intraoperative RT in locally advanced renal cancer and in metastatic diseases. Results We emphasize the progress made in RT technology that allowed the creation of a more personalized and focused treatment with a minimum rate of complications. Conclusions In the coming years, new studies will be published to confirm and increase the indications for use of RT.
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DNA Damage Signalling and Repair Inhibitors: The Long-Sought-After Achilles' Heel of Cancer. Biomolecules 2015; 5:3204-59. [PMID: 26610585 PMCID: PMC4693276 DOI: 10.3390/biom5043204] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 11/09/2015] [Indexed: 12/16/2022] Open
Abstract
For decades, radiotherapy and chemotherapy were the two only approaches exploiting DNA repair processes to fight against cancer. Nowadays, cancer therapeutics can be a major challenge when it comes to seeking personalized targeted medicine that is both effective and selective to the malignancy. Over the last decade, the discovery of new targeted therapies against DNA damage signalling and repair has offered the possibility of therapeutic improvements in oncology. In this review, we summarize the current knowledge of DNA damage signalling and repair inhibitors, their molecular and cellular effects, and future therapeutic use.
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Liao C, Xiao W, Zhu N, Liu Z, Yang J, Wang Y, Hong M. MicroR-545 enhanced radiosensitivity via suppressing Ku70 expression in Lewis lung carcinoma xenograft model. Cancer Cell Int 2015; 15:56. [PMID: 26041979 PMCID: PMC4453103 DOI: 10.1186/s12935-015-0207-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 05/15/2015] [Indexed: 01/01/2023] Open
Abstract
Objective Radiotherapy is an important therapeutic method for lung cancer. However, in clinical situations, cellular resistance to radiotherapy is a significant component of tumor treatment failure. Thus, clarification in cellular mechanism underlying radiosensitivity of cancer cell is urgently needed. In this study, we established a radiation model of Lewis lung carcinoma in C57BL/6 mice and investigated the possible signaling molecule involved in this process. Methods C57BL/6 mice were subcutaneously transplanted with Lewis lung carcinoma cells and locally irradiated followed by measurement in tumor volume. Levels of miR-545 and Ku70 mRNA expression were determined by using Quantitative Real-Time PCR. Expression of Ku70 was determined by using western blot assay. Cell viability was analyzed by MTT assay. Cell apoptosis was examined by using TUNEL assay. Results In mice bearing Lewis lung carcinoma tumor, local radiotherapy suppressed tumor growth as well as enhanced expression of miR-545 and downregulated Ku70 level. Inhibition of miR-545 expression reduced radiosensitivity of Lewis tumor. In vitro Lewis lung carcinoma cells experiment, we observed that miR-545 regulated Ku70 expression by targeting Ku70 3′UTR and this process was involved in radiotherapy. This was demonstrated by result of cell proliferation assay in which irradiation reduced apoptosis of cells was mediated by miR-545 inactivation which was reversed by Ku70 silence. Conclusion miR-545 increased radiosensitivity of Lewis lung carcinoma via inhibiting Ku70 expression.
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Affiliation(s)
- Chen Liao
- Department of Radiotherapy, Nanjing Chest Hospital Affiliated to Southeast University, Guangzhou Road, No215, P.R, Nanjing, Jiangsu 210029 China
| | - Wei Xiao
- Department of Radiotherapy, Nanjing Chest Hospital Affiliated to Southeast University, Guangzhou Road, No215, P.R, Nanjing, Jiangsu 210029 China
| | - Nuo Zhu
- Department of Radiotherapy, Nanjing Chest Hospital Affiliated to Southeast University, Guangzhou Road, No215, P.R, Nanjing, Jiangsu 210029 China
| | - Zhiyuan Liu
- Department of Radiotherapy, Nanjing Chest Hospital Affiliated to Southeast University, Guangzhou Road, No215, P.R, Nanjing, Jiangsu 210029 China
| | - Jiu Yang
- Department of Radiotherapy, Nanjing Chest Hospital Affiliated to Southeast University, Guangzhou Road, No215, P.R, Nanjing, Jiangsu 210029 China
| | - Yanhu Wang
- Department of Radiotherapy, Nanjing Chest Hospital Affiliated to Southeast University, Guangzhou Road, No215, P.R, Nanjing, Jiangsu 210029 China
| | - Mei Hong
- Department of Radiotherapy, Nanjing Chest Hospital Affiliated to Southeast University, Guangzhou Road, No215, P.R, Nanjing, Jiangsu 210029 China
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