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Zhang L, Zhang Y, Li K, Xue S. Hedgehog signaling and the glioma-associated oncogene in cancer radioresistance. Front Cell Dev Biol 2023; 11:1257173. [PMID: 38020914 PMCID: PMC10679362 DOI: 10.3389/fcell.2023.1257173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 10/31/2023] [Indexed: 12/01/2023] Open
Abstract
Tumor radioresistance remains a key clinical challenge. The Hedgehog (HH) signaling pathway and glioma-associated oncogene (GLI) are aberrantly activated in several cancers and are thought to contribute to cancer radioresistance by influencing DNA repair, reactive oxygen species production, apoptosis, autophagy, cancer stem cells, the cell cycle, and the tumor microenvironment. GLI is reported to activate the main DNA repair pathways, to interact with cell cycle regulators like Cyclin D and Cyclin E, to inhibit apoptosis via the activation of B-cell lymphoma-2, Forkhead Box M1, and the MYC proto-oncogene, to upregulate cell stemness related genes (Nanog, POU class 5 homeobox 1, SRY-box transcription factor 2, and the BMI1 proto-oncogene), and to promote cancer stem cell transformation. The inactivation of Patched, the receptor of HH, prevents caspase-mediated apoptosis. This causes some cancer cells to survive while others become cancer stem cells, resulting in cancer recurrence. Combination treatment using HH inhibitors (including GLI inhibitors) and conventional therapies may enhance treatment efficacy. However, the clinical use of HH signaling inhibitors is associated with toxic side effects and drug resistance. Nevertheless, selective HH agonists, which may relieve the adverse effects of inhibitors, have been developed in mouse models. Combination therapy with other pathway inhibitors or immunotherapy may effectively overcome resistance to HH inhibitors. A comprehensive cancer radiotherapy with HH or GLI inhibitor is more likely to enhance cancer treatment efficacy while further studies are still needed to overcome its adverse effects and drug resistance.
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Affiliation(s)
- Li Zhang
- Nephrology Department, The 1st Hospital of Jilin University, Changchun, China
| | - Yuhan Zhang
- General Surgery Center, Department of Thyroid Surgery, The 1st Hospital of Jilin University, Changchun, China
| | - Kaixuan Li
- General Surgery Center, Department of Thyroid Surgery, The 1st Hospital of Jilin University, Changchun, China
| | - Shuai Xue
- General Surgery Center, Department of Thyroid Surgery, The 1st Hospital of Jilin University, Changchun, China
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2
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Ren Y, Yang P, Li C, Wang WA, Zhang T, Li J, Li H, Dong C, Meng W, Zhou H. Ionizing radiation triggers mitophagy to enhance DNA damage in cancer cells. Cell Death Discov 2023; 9:267. [PMID: 37507394 PMCID: PMC10382586 DOI: 10.1038/s41420-023-01573-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 07/13/2023] [Accepted: 07/20/2023] [Indexed: 07/30/2023] Open
Abstract
Radiotherapy is an important cancer treatment strategy that causes DNA damage in tumor cells either directly or indirectly. Autophagy is a physiological process linked to DNA damage. Mitophagy is a form of autophagy, which specifically targets and eliminates impaired mitochondria, thereby upholding cellular homeostasis. However, the connection between DNA damage and mitophagy has yet to be fully elucidated. We found that mitophagy, as an upstream signal, increases ionizing radiation-induced DNA damage by downregulating or overexpressing key mitophagy proteins Parkin and BNIP3. Enhancing the basal level of mitophagy in conjunction with X-ray irradiation can potentially diminish cell cycle arrest at the G2/M phase, substantially elevate the accumulation of γ-H2AX, 53BP1, and PARP1 foci within the nucleus, augment DNA damage, and facilitate the demise of tumor cells. Consequently, this approach prolongs the survival of melanoma-bearing mice. The findings of this study are anticipated to offer a therapeutic approach for enhancing the therapeutic effectiveness of radiotherapy.
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Affiliation(s)
- Yanxian Ren
- Department of General Surgery, The First Hospital of Lanzhou University, Lanzhou, China
| | - Pengfei Yang
- School of Public Health, Yangzhou University, Yangzhou, China
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
| | - Chenghao Li
- School of Public Health, Yangzhou University, Yangzhou, China
| | - Wen-An Wang
- Department of General Surgery, The First Hospital of Lanzhou University, Lanzhou, China
| | - Tianyi Zhang
- School of Public Health, Yangzhou University, Yangzhou, China
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
| | - Jin Li
- Renmin Hospital of Wuhan Economic and Technological Development Zone, Wuhan, China
| | - Haining Li
- Gansu Provincial Cancer Hospital, Gansu Provincial Academic Institute for Medical Sciences, Lanzhou, China
| | - Chunlu Dong
- Department of General Surgery, The First Hospital of Lanzhou University, Lanzhou, China
| | - Wenbo Meng
- Department of General Surgery, The First Hospital of Lanzhou University, Lanzhou, China.
| | - Heng Zhou
- School of Public Health, Yangzhou University, Yangzhou, China.
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China.
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Qin H, Zhang H, Zhang S, Zhu S, Wang H. Protective Effect of Sirt1 against Radiation-Induced Damage. Radiat Res 2021; 196:647-657. [PMID: 34459925 DOI: 10.1667/rade-20-00139.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 08/11/2021] [Indexed: 11/03/2022]
Abstract
Radiotherapy is an important method for the treatment of malignant tumors. It can directly or indirectly lead to the formation of free radicals and DNA damage, resulting in a series of biological effects, including tumor cell death and normal tissue damage. These radiation effects are typically accompanied by the abnormal expression of sirtuin 1 (Sirt1), which deacetylates histones and non-histones. These Sirt1 substrates, including transcription factors and some catalytic enzymes, play a crucial role in anti-oxidative stress, DNA damage repair, autophagy regulation, anti-senescence, and apoptosis, which are closely related to triggering cell defense and survival in radiation-induced damage. In this article, we review the mechanisms underlying cellular responses to ionizing radiation and the role of Sirt1 in the process, with the aim of providing a theoretical basis for protection against radiation by Sirt1 as well as novel targets for developing radioprotective agents.
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Affiliation(s)
- Haoren Qin
- Tianjin University of Traditional Chinese Medicine, Tianjin, P.R. China
| | - Heng Zhang
- Department of Oncology, Institute of Integrative Oncology, Tianjin Union Medical Center of Nankai University, Tianjin, P.R. China
| | - Shiwu Zhang
- Department of Pathology, Institute of Translational Medicine, Tianjin Union Medical Center of Nankai University, Tianjin, P.R. China
| | - Siwei Zhu
- Department of Oncology, Institute of Integrative Oncology, Tianjin Union Medical Center of Nankai University, Tianjin, P.R. China
| | - Hui Wang
- Department of Oncology, Institute of Integrative Oncology, Tianjin Union Medical Center of Nankai University, Tianjin, P.R. China
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Comparable radiation sensitivity in p53 wild-type and p53 deficient tumor cells associated with different cell death modalities. Cell Death Discov 2021; 7:184. [PMID: 34285189 PMCID: PMC8292512 DOI: 10.1038/s41420-021-00570-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 05/05/2021] [Accepted: 06/25/2021] [Indexed: 11/08/2022] Open
Abstract
Studies of radiation interaction with tumor cells often take apoptosis as the desired results. However, mitotic catastrophe and senescence are also promoted by clinically relevant doses of radiation. Furthermore, p53 is a well-known transcription factor that is closely associated with radiosensitivity and radiation-induced cell death. Therefore, we aimed to investigate the involvement of radiosensitivity, cell death modalities and p53 status in response to carbon-ion radiation (CIR) here. Isogenic human colorectal cancer cell lines HCT116 (p53+/+ and p53-/-) were irradiated with high-LET carbon ions. Cell survival was determined by the standard colony-forming assay. 53BP1 foci were visualized to identify the repair kinetics of DNA double-strand breaks (DSBs). Cellular senescence was measured by SA-β-Gal and Ki67 staining. Mitotic catastrophe was determined with DAPI staining. Comparable radiosensitivities of p53+/+ and p53-/- HCT116 colorectal cells induced by CIR were demonstrated, as well as persistent 53BP1 foci indicated DNA repair deficiency in both cell lines. Different degree of premature senescence in isogenic HCT116 colorectal cancer cells suggested that CIR-induced premature senescence was more dependent on p21 but not p53. Sustained upregulation of p21 played multifunctional roles in senescence enhancement and apoptosis inhibition in p53+/+ cells. p21 inhibition further increased radiosensitivity of p53+/+ cells. Complex cell death modalities rather than single cell death were induced in both p53+/+ and p53-/- cells after 5 Gy CIR. Mitotic catastrophe was predominant in p53-/- cells due to inefficient activation of Chk1 and Chk2 phosphorylation in combination with p53 null. Senescence was the major cell death mechanism in p53+/+ cells via p21-dependent pathway. Taken together, p21-mediated premature senescence might be used by tumor cells to escape from CIR-induced cytotoxicity, at least for a time.
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Li L, Liu WL, Su L, Lu ZC, He XS. The Role of Autophagy in Cancer Radiotherapy. Curr Mol Pharmacol 2021; 13:31-40. [PMID: 31400274 DOI: 10.2174/1874467212666190809154518] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 07/16/2019] [Accepted: 07/18/2019] [Indexed: 12/13/2022]
Abstract
BACKGROUND Autophagy, a pathway for lysosomal-mediated cellular degradation, is a catabolic process that recycles intracellular components to maintain metabolism and survival. It is classified into three major types: macroautophagy, microautophagy, and the chaperone-mediated autophagy (CMA). Autophagy is a dynamic and multistep process that includes four stages: nucleation, elongation, autophagosome formation, and fusion. Interestingly, the influence of autophagy in cancer development is complex and paradoxical, suppressive, or promotive in different contexts. Autophagy in cancer has been demonstrated to serve as both a tumour suppressor and promoter. Radiotherapy is a powerful and common strategy for many different types of cancer and can induce autophagy, which has been shown to modulate sensitivity of cancer to radiotherapy. However, the role of autophagy in radiation treatment is controversial. Some reports showed that the upregulation of autophagy was cytoprotective for cancer cells. Others, in contrast, showed that the induction of autophagy was advantageous. Here, we reviewed recent studies and attempted to discuss the various aspects of autophagy in response to radiotherapy of cancer. Thus, we could decrease the viability of cancer cell and increase the sensibility of cancer cells to radiation, providing a new basis for the application of autophagy in clinical tumor radiotherapy.
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Affiliation(s)
- Lei Li
- Cancer Research Institute, Hengyang Medical College of University of South China, No. 28, West Changsheng Road, Hengyang City, Hunan Province, China
| | - Wen-Ling Liu
- Cancer Research Institute, Hengyang Medical College of University of South China, No. 28, West Changsheng Road, Hengyang City, Hunan Province, China
| | - Lei Su
- Cancer Research Institute, Hengyang Medical College of University of South China, No. 28, West Changsheng Road, Hengyang City, Hunan Province, China
| | - Zhou-Cheng Lu
- Second Affiliated Hospital of South China University, Hengyang City, Hunan Province, China
| | - Xiu-Sheng He
- Cancer Research Institute, Hengyang Medical College of University of South China, No. 28, West Changsheng Road, Hengyang City, Hunan Province, China
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Dai LB, Zhong JT, Shen LF, Zhou SH, Lu ZJ, Bao YY, Fan J. Radiosensitizing effects of curcumin alone or combined with GLUT1 siRNA on laryngeal carcinoma cells through AMPK pathway-induced autophagy. J Cell Mol Med 2021; 25:6018-6031. [PMID: 33955148 DOI: 10.1111/jcmm.16450] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 11/29/2020] [Accepted: 02/25/2021] [Indexed: 12/16/2022] Open
Abstract
In this study, we investigated the ability of curcumin alone or in combination with GLUT1 siRNA to radiosensitize laryngeal carcinoma (LC) through the induction of autophagy. Protein levels in tumour tissues and LC cells were measured by immunohistochemistry and Western blotting. In vitro, cell proliferation, colony formation assays, cell death and autophagy were detected. A nude mouse xenograft model was established through the injection of Tu212 cells. We found that GLUT1 was highly expressed and negatively associated with autophagy-related proteins in LC and that curcumin suppressed radiation-mediated GLUT1 overexpression in Tu212 cells. Treatment with curcumin, GLUT1 siRNA, or the combination of the two promoted autophagy. Inhibition of autophagy using 6-amino-3-methypourine (3-MA) promoted apoptosis after irradiation or treatment of cells with curcumin and GLUT1 siRNA. 3-MA inhibited curcumin and GLUT1 siRNA-mediated non-apoptotic programmed cell death. The combination of curcumin, GLUT1 siRNA and 3-MA provided the strongest sensitization in vivo. We also found that autophagy induction after curcumin or GLUT1 siRNA treatment implicated in the AMP-activated protein kinase-mTOR-serine/threonine-protein kinase-Beclin1 signalling pathway. Irradiation primarily caused apoptosis, and when combined with curcumin and GLUT1 siRNA treatment, the increased radiosensitivity of LC occurred through the concurrent induction of apoptosis and autophagy.
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Affiliation(s)
- Li-Bo Dai
- Department of Otolaryngology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Jiang-Tao Zhong
- Department of Otolaryngology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Li-Fang Shen
- Department of Otolaryngology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Shui-Hong Zhou
- Department of Otolaryngology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Zhong-Jie Lu
- Department of Radiotherapy, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Yang-Yang Bao
- Department of Otolaryngology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Jun Fan
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
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Chen Y, Zitello E, Guo R, Deng Y. The function of LncRNAs and their role in the prediction, diagnosis, and prognosis of lung cancer. Clin Transl Med 2021; 11:e367. [PMID: 33931980 PMCID: PMC8021541 DOI: 10.1002/ctm2.367] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 02/22/2021] [Accepted: 03/05/2021] [Indexed: 12/24/2022] Open
Abstract
Lung cancer remains a major threat to human health. Low dose CT scan (LDCT) has become the main method of early screening for lung cancer due to the low sensitivity of chest X-ray. However, LDCT not only has a high false positive rate, but also entails risks of overdiagnosis and cumulative radiation exposure. In addition, cumulative radiation by LDCT screening and subsequent follow-up can increase the risk of lung cancer. Many studies have shown that long noncoding RNAs (lncRNAs) remain stable in blood, and profiling of blood has the advantages of being noninvasive, readily accessible and inexpensive. Serum or plasma assay of lncRNAs in blood can be used as a novel detection method to assist LDCT while improving the accuracy of early lung cancer screening. LncRNAs can participate in the regulation of various biological processes. A large number of researches have reported that lncRNAs are key regulators involved in the progression of human cancers through multiple action models. Especially, some lncRNAs can affect various hallmarks of lung cancer. In addition to their diagnostic value, lncRNAs also possess promising potential in other clinical applications toward lung cancer. LncRNAs can be used as predictive markers for chemosensitivity, radiosensitivity, and sensitivity to epidermal growth factor receptor (EGFR)-targeted therapy, and as well markers of prognosis. Different lncRNAs have been implicated to regulate chemosensitivity, radiosensitivity, and sensitivity to EGFR-targeted therapy through diverse mechanisms. Although many challenges need to be addressed in the future, lncRNAs have bright prospects as an adjunct to radiographic methods in the clinical management of lung cancer.
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Affiliation(s)
- Yu Chen
- Department of Quantitative Health SciencesJohn A. Burns School of Medicine, University of Hawaii at ManoaHonoluluHawaiiUSA
- Department of Molecular Biosciences and Bioengineering, College of Tropical Agriculture and Human ResourcesUniversity of Hawaii at ManoaHonoluluHawaiiUSA
| | - Emory Zitello
- Department of Quantitative Health SciencesJohn A. Burns School of Medicine, University of Hawaii at ManoaHonoluluHawaiiUSA
- Department of Molecular Biosciences and Bioengineering, College of Tropical Agriculture and Human ResourcesUniversity of Hawaii at ManoaHonoluluHawaiiUSA
| | - Rui Guo
- School of Public HealthGuangxi Medical UniversityNanningChina
| | - Youping Deng
- Department of Quantitative Health SciencesJohn A. Burns School of Medicine, University of Hawaii at ManoaHonoluluHawaiiUSA
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The Oxygen-Generating Calcium Peroxide-Modified Magnetic Nanoparticles Attenuate Hypoxia-Induced Chemoresistance in Triple-Negative Breast Cancer. Cancers (Basel) 2021; 13:cancers13040606. [PMID: 33546453 PMCID: PMC7913619 DOI: 10.3390/cancers13040606] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/26/2021] [Accepted: 01/27/2021] [Indexed: 12/22/2022] Open
Abstract
Cancer response to chemotherapy is regulated not only by intrinsic sensitivity of cancer cells but also by tumor microenvironment. Tumor hypoxia, a condition of low oxygen level in solid tumors, is known to increase the resistance of cancer cells to chemotherapy. Triple-negative breast cancer (TNBC) is the most aggressive subtype of breast cancer. Due to lack of target in TNBC, chemotherapy is the only approved systemic treatment. We evaluated the effect of hypoxia on chemotherapy resistance in TNBC in a series of in vitro and in vivo experiments. Furthermore, we synthesized the calcium peroxide-modified magnetic nanoparticles (CaO2-MNPs) with the function of oxygen generation to improve and enhance the therapeutic efficiency of doxorubicin treatment in the hypoxia microenvironment of TNBC. The results of gene set enrichment analysis (GSEA) software showed that the hypoxia and autophagy gene sets are significantly enriched in TNBC patients. We found that the chemical hypoxia stabilized the expression of hypoxia-inducible factor 1α (HIF-1α) protein and increased doxorubicin resistance in TNBC cells. Moreover, hypoxia inhibited the induction of apoptosis and autophagy by doxorubicin. In addition, CaO2-MNPs promoted ubiquitination and protein degradation of HIF-1α. Furthermore, CaO2-MNPs inhibited autophagy and induced apoptosis in TNBC cells. Our animal studies with an orthotopic mouse model showed that CaO2-MNPs in combination with doxorubicin exhibited a stronger tumor-suppressive effect on TNBC, compared to the doxorubicin treatment alone. Our findings suggest that combined with CaO2-MNPs and doxorubicin attenuates HIF-1α expression to improve the efficiency of chemotherapy in TNBC.
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Alonso-González C, González A, Menéndez-Menéndez J, Martínez-Campa C, Cos S. Melatonin as a Radio-Sensitizer in Cancer. Biomedicines 2020; 8:E247. [PMID: 32726912 PMCID: PMC7460067 DOI: 10.3390/biomedicines8080247] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 07/15/2020] [Accepted: 07/22/2020] [Indexed: 02/07/2023] Open
Abstract
Radiotherapy is one of the treatments of choice in many types of cancer. Adjuvant treatments to radiotherapy try, on one hand, to enhance the response of tumor cells to radiation and, on the other hand, to reduce the side effects to normal cells. Radiosensitizers are agents that increase the effect of radiation in tumor cells by trying not to increase side effects in normal tissues. Melatonin is a hormone produced mainly by the pineal gland which has an important role in the regulation of cancer growth, especially in hormone-dependent mammary tumors. Different studies have showed that melatonin administered with radiotherapy is able to enhance its therapeutic effects and can protect normal cells against side effects of this treatment. Several mechanisms are involved in the radiosensitization induced by melatonin: increase of reactive oxygen species production, modulation of proteins involved in estrogen biosynthesis, impairment of tumor cells to DNA repair, modulation of angiogenesis, abolition of inflammation, induction of apoptosis, stimulation of preadipocytes differentiation and modulation of metabolism. At this moment, there are very few clinical trials that study the therapeutic usefulness to associate melatonin and radiotherapy in humans. All findings point to melatonin as an effective adjuvant molecule to radiotherapy in cancer treatment.
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Affiliation(s)
| | - Alicia González
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria and Instituto de Investigación Sanitaria Valdecilla (IDIVAL), 39011 Santander, Spain; (C.A.-G.); (J.M.-M.); (S.C.)
| | | | - Carlos Martínez-Campa
- Department of Physiology and Pharmacology, School of Medicine, University of Cantabria and Instituto de Investigación Sanitaria Valdecilla (IDIVAL), 39011 Santander, Spain; (C.A.-G.); (J.M.-M.); (S.C.)
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Podralska M, Ciesielska S, Kluiver J, van den Berg A, Dzikiewicz-Krawczyk A, Slezak-Prochazka I. Non-Coding RNAs in Cancer Radiosensitivity: MicroRNAs and lncRNAs as Regulators of Radiation-Induced Signaling Pathways. Cancers (Basel) 2020; 12:E1662. [PMID: 32585857 PMCID: PMC7352793 DOI: 10.3390/cancers12061662] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 06/19/2020] [Accepted: 06/21/2020] [Indexed: 02/07/2023] Open
Abstract
Radiotherapy is a cancer treatment that applies high doses of ionizing radiation to induce cell death, mainly by triggering DNA double-strand breaks. The outcome of radiotherapy greatly depends on radiosensitivity of cancer cells, which is determined by multiple proteins and cellular processes. In this review, we summarize current knowledge on the role of microRNAs (miRNAs) and long non-coding RNAs (lncRNAs), in determining the response to radiation. Non-coding RNAs modulate ionizing radiation response by targeting key signaling pathways, including DNA damage repair, apoptosis, glycolysis, cell cycle arrest, and autophagy. Additionally, we indicate miRNAs and lncRNAs that upon overexpression or inhibition alter cellular radiosensitivity. Current data indicate the potential of using specific non-coding RNAs as modulators of cellular radiosensitivity to improve outcome of radiotherapy.
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Affiliation(s)
- Marta Podralska
- Institute of Human Genetics, Polish Academy of Sciences, 60-479 Poznań, Poland;
| | - Sylwia Ciesielska
- Department of Systems Biology and Engineering, Faculty of Automatic Control, Electronics and Computer Science, Silesian University of Technology, 44-100 Gliwice, Poland;
| | - Joost Kluiver
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center, Groningen, 9700RB Groningen, The Netherlands; (J.K.); (A.v.d.B.)
| | - Anke van den Berg
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center, Groningen, 9700RB Groningen, The Netherlands; (J.K.); (A.v.d.B.)
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Kim HJ, Kang SU, Lee YS, Jang JY, Kang H, Kim CH. Protective Effects of N-Acetylcysteine against Radiation-Induced Oral Mucositis In Vitro and In Vivo. Cancer Res Treat 2020; 52:1019-1030. [PMID: 32599978 PMCID: PMC7577823 DOI: 10.4143/crt.2020.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 06/18/2020] [Indexed: 12/14/2022] Open
Abstract
PURPOSE Radiation-induced oral mucositis limits delivery of high-dose radiation to targeted cancers. Therefore, it is necessary to develop a treatment strategy to alleviate radiation-induced oral mucositis during radiation therapy. We previously reported that inhibiting reactive oxygen species (ROS) generation suppresses autophagy. Irradiation induces autophagy, suggesting that antioxidant treatment may be used to inhibit radiation-induced oral mucositis. Materials and Methods We determined whether treatment with N-acetyl cysteine (NAC) could attenuate radiation-induced buccal mucosa damage in vitro and in vivo. The protective effects of NAC against oral mucositis were confirmed by transmission electron microscopy and immunocytochemistry. mRNA and protein levels of DNA damage and autophagy-related genes were measured by quantitative real-time polymerase chain reaction and western blot analysis, respectively. RESULTS Rats manifesting radiation-induced oral mucositis showed decreased oral intake, loss of body weight, and low survival rate. NAC intake slightly increased oral intake, body weight, and the survival rate without statistical significance. However, histopathologic characteristics were markedly restored in NAC-treated irradiated rats. LC3B staining of rat buccal mucosa revealed that NAC treatment significantly decreased the number of radiation-induced autophagic cells. Further, NAC inhibited radiation-induced ROS generation and autophagy signaling. In vitro, NAC treatment significantly reduced the expression of NRF2, LC3B, p62, and Beclin-1 in keratinocytes compared with that after radiation treatment. CONCLUSION NAC treatment significantly inhibited radiation-induced autophagy in keratinocytes and rat buccal mucosa and may be a potentially safe and effective option for the prevention of radiation-induced buccal mucosa damage.
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Affiliation(s)
- Haeng Jun Kim
- Department of Molecular Science and Technology, Ajou University, Suwon, Korea
| | - Sung Un Kang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Yun Sang Lee
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Jeon Yeob Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Hami Kang
- Program of Public Health Studies, Johns Hopkins University, Baltimore, MD, USA
| | - Chul-Ho Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
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12
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Dai LB, Yu Q, Zhou SH, Bao YY, Zhong JT, Shen LF, Lu ZJ, Fan J, Huang YP. Effect of combination of curcumin and GLUT-1 AS-ODN on radiosensitivity of laryngeal carcinoma through regulating autophagy. Head Neck 2020; 42:2287-2297. [PMID: 32314842 DOI: 10.1002/hed.26180] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Revised: 02/26/2020] [Accepted: 04/03/2020] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND This study is to explore the role of curcumin and GLUT-1 antisense oligodeoxynucleotides (AS-ODN) on autophagy modulation-initiated radiosensitivity. METHODS BALB/c mice were employed to establish xenograft model using Tu212 cell. The expression of autophagy- and apoptosis-related proteins was determined by WB. Autophagosome was observed under transmission electron microscope. Apoptosis of tumor tissue were detected by TUNEL staining. RESULTS Combinations of curcumin and GLUT-1 AS-ODN with 10 Gy inhibited the tumor growth by inducing apoptosis of laryngeal cancer cells followed with the enhancement of autophagy. 3-MA also had a promotion effect on irradiation-mediated growth inhibition possibly by depressing PI3K and on curcumin/GLUT-1 AS-ODN-mediated growth inhibition potentially by regulating autophagic events. Of note, a de-escalation of radiotherapy dose (5 Gy) along with curcumin, GLUT-1 AS-ODN or 3-MA produced a stronger effect than high dosage of radiotherapy (10 Gy) alone. CONCLUSIONS Curcumin and GLUT-1 AS-ODN improve the radiosensitivity of laryngeal carcinoma through regulating autophagy and inducing apoptosis.
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Affiliation(s)
- Li-Bo Dai
- Department of Otolaryngology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Qi Yu
- Department of Otolaryngology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Shui-Hong Zhou
- Department of Otolaryngology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Yang-Yang Bao
- Department of Otolaryngology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Jiang-Tao Zhong
- Department of Otolaryngology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Li-Fang Shen
- Department of Otolaryngology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Zhong-Jie Lu
- Department of Radiotherapy, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Jun Fan
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Ya-Ping Huang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
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Yan L, Wang LZ, Xiao R, Cao R, Pan B, Lv XY, Jiao H, Zhuang Q, Sun XJ, Liu YB. Inhibition of microRNA-21-5p reduces keloid fibroblast autophagy and migration by targeting PTEN after electron beam irradiation. J Transl Med 2020; 100:387-399. [PMID: 31558773 DOI: 10.1038/s41374-019-0323-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 08/14/2019] [Accepted: 08/22/2019] [Indexed: 01/17/2023] Open
Abstract
Electron beam (EB) irradiation is useful to reduce the recurrence of keloids; however, the underlying mechanism remains unknown. MicroRNA-21 (miR-21), which regulates autophagy during cancer radiation therapy, was identified as a potential therapeutic target for keloids. Here, we investigate the regulatory mechanism(s) of miR-21-5p on keloid fibroblast autophagy and migration after EB irradiation. The microRNA expression profile of the keloid dermis was examined by performing a microRNA microarray. Levels of LC3B and Beclin-1 were detected by immunohistochemical and western blot analysis in the keloid dermis and fibroblasts. Autophagy and apoptosis were tested in keloid fibroblasts after EB irradiation or transfection with an miR-21-5p inhibitor using electron microscopy, a Cyto-ID Green Autophagy Detection Kit, and an Annexin V PE Apoptosis Detection Kit. Migration was analyzed by an in vitro scratch-wound healing assay. Mechanistic tests were performed using small interfering RNAs to phosphatase and tensin homolog (siPTEN). Levels of miR-21-5p, PTEN, programmed cell death 4 (PDCD4), p-AKT, and apoptosis- and autophagy-associated genes were examined by qRT-PCR and western blotting. LC3B expression and migration ability were enhanced in fibroblasts and the keloid margin dermis compared with those in the adjacent normal skin. Both EB irradiation and an miR-21-5p inhibitor reduced keloid fibroblast autophagy, which was accompanied by decreased expression of miR-21-5p, p-AKT, and LC3B-II and increased expression of PTEN, PDCD4, and apoptosis-related genes. MiR-21-5p downregulation inhibited migration and suppressed LC3B expression and this was reversed by PTEN reduction. In conclusion, with increasing apoptosis, EB irradiation inhibits autophagy in keloid fibroblasts by reducing miR-21-5p, which regulates migration and LC3B expression via PTEN/AKT signaling. These data suggest a potential mechanism wherein miR-21-5p inhibition regulates autophagy and migration in EB-irradiated keloid fibroblasts, effectively preventing local invasion and recurrence. Therefore, miR-21-5p could be a new therapeutic target, to replace EB irradiation, and control keloid relapse.
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Affiliation(s)
- Li Yan
- Research Center of Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Ba-Da-Chu Road 33#, 100144, Beijing, P.R. China
| | - Lian-Zhao Wang
- Comprehensive Treatment Center of Scar, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Ba-Da-Chu Road 33#, 100144, Beijing, P.R. China
| | - Ran Xiao
- Research Center of Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Ba-Da-Chu Road 33#, 100144, Beijing, P.R. China
| | - Rui Cao
- Research Center of Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Ba-Da-Chu Road 33#, 100144, Beijing, P.R. China
| | - Bo Pan
- Auricular Plastic and Reconstructive Surgery Center, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Ba-Da-Chu Road 33#, 100144, Beijing, P.R. China
| | - Xiao-Yan Lv
- Research Center of Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Ba-Da-Chu Road 33#, 100144, Beijing, P.R. China
| | - Hu Jiao
- Research Center of Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Ba-Da-Chu Road 33#, 100144, Beijing, P.R. China
| | - Qiang Zhuang
- Research Center of Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Ba-Da-Chu Road 33#, 100144, Beijing, P.R. China
| | - Xue-Jian Sun
- Research Center of Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Ba-Da-Chu Road 33#, 100144, Beijing, P.R. China
| | - Yuan-Bo Liu
- Department of Plastic and Reconstructive Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Ba-Da-Chu Road 33#, 100144, Beijing, P.R. China.
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Wu H, Yu J, Kong D, Xu Y, Zhang Z, Shui J, Li Z, Luo H, Wang K. Population and single‑cell transcriptome analyses reveal diverse transcriptional changes associated with radioresistance in esophageal squamous cell carcinoma. Int J Oncol 2019; 55:1237-1248. [PMID: 31638164 PMCID: PMC6831193 DOI: 10.3892/ijo.2019.4897] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Accepted: 09/09/2019] [Indexed: 12/13/2022] Open
Abstract
Esophageal squamous cell carcinoma (ESCC) is a tumor composed of heterogeneous cells that easily become radioresistant, which leads to tumor recurrence. The most commonly used treatment for ESCC is fractionated irradiation (FIR) therapy that utilizes ionizing radiation to directly induce cytotoxic cell death. However, this treatment may not be able to eliminate all cancer cells due to high adaptive evolution. To determine whether the transcriptome dynamics during ESCC recurrence formation are associated with FIR response, an in vitro cell culture model for ESCC radioresistance that mimics the common radiotherapy process in patients with ESCC was established in the present study. High‑throughput sequencing analysis of in vitro cultured ESCC cells was performed using different cumulative irradiation doses, as well as tumor samples from FIR‑treated patients with ESCC before and after the development of radioresistance. Radioresistance‑associated genes and signaling pathways that were aberrantly expressed in radioresistant ESCC cells were identified, including autophagy‑related 9B (regulation of autophagy), DNA damage‑inducible transcript 4, myoglobin and plasminogen activator tissue type, which are associated with response to hypoxia, Bcl2‑binding component 3, tumor protein P63 and interferon γ‑inducible protein 16, which are associated with DNA damage response. The heterogeneity and dynamic gene expression of ESCC cells during acquired radioresistance were further studied in primary (41 single cells), 12 Gy FIR‑treated (87 single cells) and 30 Gy FIR‑treated (89 single cells) cancer cells using a single‑cell RNA sequencing approach. The results of the present study comprehensively characterized the transcriptome dynamics during acquired radioresistance in an in vitro model of ESCC and patient tumor samples at the population and single cell level. Single‑cell RNA sequencing revealed the heterogeneity of irradiated ESCC cells and an increase in the radioresistant ESCC cell subpopulation during acquired radioresistance. Overall, these results are of potential clinical relevance as they identify a number of signaling molecules associated with radioresistance, as well as opportunities for the development of novel therapeutic options for the treatment of ESCC.
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Affiliation(s)
- Hongjin Wu
- NHC Key Laboratory of Drug Addiction Medicine (Kunming Medical University), The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China
| | - Juehua Yu
- NHC Key Laboratory of Drug Addiction Medicine (Kunming Medical University), The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China
| | - Deshengyue Kong
- Yunnan Institute of Digestive Disease, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China
| | - Yu Xu
- NHC Key Laboratory of Drug Addiction Medicine (Kunming Medical University), The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China
| | - Zunyue Zhang
- NHC Key Laboratory of Drug Addiction Medicine (Kunming Medical University), The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China
| | - Jing Shui
- Shanghai International Travel Healthcare Center, Shanghai 200000, P.R. China
| | - Ziwei Li
- NHC Key Laboratory of Drug Addiction Medicine (Kunming Medical University), The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China
| | - Huayou Luo
- Yunnan Institute of Digestive Disease, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China
| | - Kunhua Wang
- NHC Key Laboratory of Drug Addiction Medicine (Kunming Medical University), The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China
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15
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Cellular Stress Responses in Radiotherapy. Cells 2019; 8:cells8091105. [PMID: 31540530 PMCID: PMC6769573 DOI: 10.3390/cells8091105] [Citation(s) in RCA: 160] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 09/11/2019] [Accepted: 09/18/2019] [Indexed: 12/15/2022] Open
Abstract
Radiotherapy is one of the major cancer treatment strategies. Exposure to penetrating radiation causes cellular stress, directly or indirectly, due to the generation of reactive oxygen species, DNA damage, and subcellular organelle damage and autophagy. These radiation-induced damage responses cooperatively contribute to cancer cell death, but paradoxically, radiotherapy also causes the activation of damage-repair and survival signaling to alleviate radiation-induced cytotoxic effects in a small percentage of cancer cells, and these activations are responsible for tumor radio-resistance. The present study describes the molecular mechanisms responsible for radiation-induced cellular stress response and radioresistance, and the therapeutic approaches used to overcome radioresistance.
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16
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Zhu J, Chen S, Yang B, Mao W, Yang X, Cai J. Molecular mechanisms of lncRNAs in regulating cancer cell radiosensitivity. Biosci Rep 2019; 39:BSR20190590. [PMID: 31391206 PMCID: PMC6712435 DOI: 10.1042/bsr20190590] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 08/05/2019] [Accepted: 08/06/2019] [Indexed: 12/21/2022] Open
Abstract
Radiotherapy is one of the main modalities of cancer treatment. However, tumor recurrence following radiotherapy occurs in many cancer patients. A key to solving this problem is the optimization of radiosensitivity. In recent years, long non-coding RNAs (lncRNAs), which affect the occurrence and development of tumors through a variety of mechanisms, have become a popular research topic. LncRNAs have been found to influence radiosensitivity by regulating various mechanisms, including DNA damage repair, cell cycle arrest, apoptosis, cancer stem cells regulation, epithelial-mesenchymal transition, and autophagy. LncRNAs are expected to become a potential therapeutic target for radiotherapy in the future. This article reviews recent advances in the role and mechanism of lncRNAs in tumor radiosensitivity.
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Affiliation(s)
- Jiamin Zhu
- Department of Oncology, the Affiliated Jiangyin Hospital of Southeast University Medical College, 163 Shoushan Road, Jiangyin 214400, P.R. China
- Department of Radiation Oncology, Nantong Tumor Hospital, Affiliated Tumor Hospital of Nantong University, Nantong 226321, China
| | - Shusen Chen
- Department of Radiation Oncology, Nantong Tumor Hospital, Affiliated Tumor Hospital of Nantong University, Nantong 226321, China
| | - Baixia Yang
- Department of Radiation Oncology, Nantong Tumor Hospital, Affiliated Tumor Hospital of Nantong University, Nantong 226321, China
| | - Weidong Mao
- Department of Oncology, the Affiliated Jiangyin Hospital of Southeast University Medical College, 163 Shoushan Road, Jiangyin 214400, P.R. China
| | - Xi Yang
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, Department of Oncology, Shanghai Medical College, Fudan University, Shanghai 200032, China
| | - Jing Cai
- Department of Radiation Oncology, Nantong Tumor Hospital, Affiliated Tumor Hospital of Nantong University, Nantong 226321, China
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17
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Min HJ, Suh KD, Lee YH, Kim KS, Mun SK, Lee SY. Cytoplasmic HMGB1 and HMGB1-Beclin1 complex are increased in radioresistant oral squamous cell carcinoma. Br J Oral Maxillofac Surg 2019; 57:219-225. [PMID: 30738622 DOI: 10.1016/j.bjoms.2019.01.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Accepted: 01/23/2019] [Indexed: 12/13/2022]
Abstract
Cytoplasmic high mobility group box 1 (HMGB1) is an autophagy regulator, and autophagy is important in the radioresistance of various solid cancers. We evaluated the degree of autophagy and cytoplasmic HMGB1 in radioresistant oral squamous cell carcinoma (SCC) by culturing the SCC15 and quasiliquid layer 1 (QLL1) SCC cell lines that originate from cancer of the oral tongue and a metastatic lymph node, respectively, and then delivered radiation to induce radioresistance to cells. We then compared the degree of autophagy between non-irradiated control and radioresistant cancer cells using a western blot assay. We also compared the total and cytoplasmic concentrations of HMGB1 between the non-irradiated control and radioresistant cancer cells by western blot assay, and extracellular concentrations of HMGB1 with an enzyme-linked immunosorbent assay (ELISA). Formation of an HMGB1-Beclin1 complex was evaluated by immunofluorescence and co-immunoprecipitation assays. Autophagy increased in the radioresistant SCC15 cells (compared with non-irradiated control SCC15 cells) but not in the radioresistant QLL1 cells. The total amount of HMGB1 expression within cells did not differ; however, the degree of cytoplasmic HMGB1 expression was higher in radioresistant SCC15 cells than in non-irradiated control SCC15 cells. The HMGB1-Beclin1 complex, which is a main regulator of autophagy, was also increased in radioresistant SCC15 cells compared with non-irradiated control SCC15 cells. Autophagy flux and cytoplasmic HMGB1-Beclin1 increased after the acquisition of radioresistance in oral SCC.
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Affiliation(s)
- Hyun Jin Min
- Department of Otorhinolaryngology - Head and Neck Surgery, College of Medicine, Chung-Ang University, Seoul, Republic of Korea
| | - Kang Duk Suh
- Department of Otorhinolaryngology - Head and Neck Surgery, College of Medicine, Chung-Ang University, Seoul, Republic of Korea
| | - Yang Ho Lee
- Department of Otorhinolaryngology - Head and Neck Surgery, College of Medicine, Chung-Ang University, Seoul, Republic of Korea
| | - Kyung Soo Kim
- Department of Otorhinolaryngology - Head and Neck Surgery, College of Medicine, Chung-Ang University, Seoul, Republic of Korea
| | - Seog-Kyun Mun
- Department of Otorhinolaryngology - Head and Neck Surgery, College of Medicine, Chung-Ang University, Seoul, Republic of Korea
| | - Sei Young Lee
- Department of Otorhinolaryngology - Head and Neck Surgery, College of Medicine, Chung-Ang University, Seoul, Republic of Korea.
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18
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Zheng F, Wei L, Zhao L, Ni F. Pathway Network Analysis of Complex Diseases Based on Multiple Biological Networks. BIOMED RESEARCH INTERNATIONAL 2018; 2018:5670210. [PMID: 30151386 PMCID: PMC6091292 DOI: 10.1155/2018/5670210] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Revised: 02/06/2018] [Accepted: 03/11/2018] [Indexed: 12/14/2022]
Abstract
Biological pathways play important roles in the development of complex diseases, such as cancers, which are multifactorial complex diseases that are usually caused by multiple disorders gene mutations or pathway. It has become one of the most important issues to analyze pathways combining multiple types of high-throughput data, such as genomics and proteomics, to understand the mechanisms of complex diseases. In this paper, we propose a method for constructing the pathway network of gene phenotype and find out disease pathogenesis pathways through the analysis of the constructed network. The specific process of constructing the network includes, firstly, similarity calculation between genes expressing data combined with phenotypic mutual information and GO ontology information, secondly, calculating the correlation between pathways based on the similarity between differential genes and constructing the pathway network, and, finally, mining critical pathways to identify diseases. Experimental results on Breast Cancer Dataset using this method show that our method is better. In addition, testing on an alternative dataset proved that the key pathways we found were more accurate and reliable as biological markers of disease. These results show that our proposed method is effective.
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Affiliation(s)
- Fang Zheng
- College of Informatics, Huazhong Agricultural University, Wuhan 430079, China
| | - Le Wei
- College of Informatics, Huazhong Agricultural University, Wuhan 430079, China
| | - Liang Zhao
- College of Informatics, Huazhong Agricultural University, Wuhan 430079, China
| | - FuChuan Ni
- College of Informatics, Huazhong Agricultural University, Wuhan 430079, China
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19
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Tao H, Qian P, Lu J, Guo Y, Zhu H, Wang F. Autophagy inhibition enhances radiosensitivity of Eca‑109 cells via the mitochondrial apoptosis pathway. Int J Oncol 2018; 52:1853-1862. [PMID: 29620258 PMCID: PMC5919709 DOI: 10.3892/ijo.2018.4349] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 03/26/2018] [Indexed: 01/11/2023] Open
Abstract
Autophagy inhibition is crucial for the improvement of the efficacy of radiotherapy in cancer. The aim of the present study was to determine the potential therapeutic value of autophagy and its correlation with mitochondria in human esophageal carcinoma cells following treatment with ionizing radiation (IR). Autophagy in Eca-109 cells was induced under poor nutrient conditions. The formation of autophagic vacuoles was monitored using electron microscopy. In addition, cell apoptosis after IR and mitochondrial membrane potential (MMP) were analyzed by flow cytometry. LC3, beclin-1, cytochrome c and apoptosis-related proteins were assayed by western blotting. A nude mouse xenograft model was also employed to verify the biological effects and mechanisms underlying autophagy in vivo. The formed autophagic vesicles and increased LC3 II/LC3 I ratio indicated marked induction of autophagy by Earle's balanced salt solution (EBSS) in Eca-109 cells. 3-Methyladenine or LY294002 significantly antagonized EBSS-induced autophagy and increased apoptosis of irradiated cells, suggesting that autophagy inhibition conferred radiosensitivity in vitro. Notably, IR induced prominent release of cytochrome c and Bax activation, and decreased Bcl-2 and MMP expression in Eca-109 cells under poor nutrient conditions. Of note, these changes were more prominent following pretreatment with autophagy inhibitors. In vivo, IR treatment mildly delayed tumor growth, but the radiotherapeutic effect was improved significantly by abolishing autophagy. Furthermore, mitochondrial signaling was investigated in the Eca-109 xenograft nude mice model, and the results were consistent with the in vitro study. Therefore, the mitochondrial pathway may be associated with improvement of radiosensitivity in Eca-109 cells.
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Affiliation(s)
- Hua Tao
- Department of Radiotherapy Oncology, Jiangsu Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing Medical University Affiliated Cancer Hospital, Nanjing, Jiangsu 210009, P.R. China
| | - Pudong Qian
- Department of Radiotherapy Oncology, Jiangsu Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing Medical University Affiliated Cancer Hospital, Nanjing, Jiangsu 210009, P.R. China
| | - Jincheng Lu
- Department of Radiotherapy Oncology, Jiangsu Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing Medical University Affiliated Cancer Hospital, Nanjing, Jiangsu 210009, P.R. China
| | - Yesong Guo
- Department of Radiotherapy Oncology, Jiangsu Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing Medical University Affiliated Cancer Hospital, Nanjing, Jiangsu 210009, P.R. China
| | - Huanfeng Zhu
- Department of Radiotherapy Oncology, Jiangsu Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing Medical University Affiliated Cancer Hospital, Nanjing, Jiangsu 210009, P.R. China
| | - Feijiang Wang
- Department of Radiotherapy Oncology, Jiangsu Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing Medical University Affiliated Cancer Hospital, Nanjing, Jiangsu 210009, P.R. China
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20
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Wen J, Liu H, Wang L, Wang X, Gu N, Liu Z, Xu T, Gomez DR, Komaki R, Liao Z, Wei Q. Potentially Functional Variants of ATG16L2 Predict Radiation Pneumonitis and Outcomes in Patients with Non-Small Cell Lung Cancer after Definitive Radiotherapy. J Thorac Oncol 2018; 13:660-675. [PMID: 29454863 DOI: 10.1016/j.jtho.2018.01.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 12/13/2017] [Accepted: 01/26/2018] [Indexed: 02/07/2023]
Abstract
INTRODUCTION Autophagy not only plays an important role in the progression of cancer but is also involved in tissue inflammatory response. However, few published studies have investigated associations between functional genetic variants of autophagy-related genes and radiation pneumonitis (RP) as well as clinical outcomes in patients with NSCLC after definitive radiotherapy. METHODS We genotyped nine potentially functional single-nucleotide polymorphisms (SNPs) in four autophagy-related genes (autophagy related 2B gene [ATG2B], autophagy related 10 gene [ATG10], autophagy related 12 gene [ATG12], and autophagy related 16 like 2 gene [ATG16L2]) in 393 North American patients with NSCLC treated by definitive radiotherapy and assessed their associations with RP, local recurrence-free survival (LRFS), progression-free survival (PFS), and overall survival (OS) in multivariable Cox proportional hazard regression analyses. RESULTS We found that patients with the ATG16L2 rs10898880 CC variant genotype had a better LRFS, PFS, and OS (adjusted hazard ratio = 0.59, 0.64, and 0.64; 95% confidence interval: 0.45-0.79, 0.48-0.84, and 0.48-0.86; p = 0.0004, 0.002, and 0.003, respectively), but a greater risk for development of severe RP (adjusted hazard ratio = 1.80, 95% confidence interval: 1.04-3.12, p = 0.037) than did patients with AA/AC genotypes. Further functional analyses suggested that the ATG16L2 rs10898880 C variant allele modulated expression of the ATG16L2 gene. CONCLUSION This is the first report that one potentially functional SNP rs10898880 in ATG16L2 may be a predictor of RP, LRFS, PFS, and OS in patients with NSCLC after definitive radiotherapy. Additional larger, prospective studies are needed to confirm these findings.
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Affiliation(s)
- Juyi Wen
- Department of Radiation Oncology, Navy General Hospital, Beijing, People's Republic of China; Department of Radiation Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
| | - Hongliang Liu
- Duke Cancer Institute, Duke University Medical Center, Durham, North Carolina; Department of Population Health Sciences, Duke University School of Medicine, Durham, North Carolina
| | - Lili Wang
- Duke Cancer Institute, Duke University Medical Center, Durham, North Carolina; Department of Population Health Sciences, Duke University School of Medicine, Durham, North Carolina
| | - Xiaomeng Wang
- Duke Cancer Institute, Duke University Medical Center, Durham, North Carolina; Department of Population Health Sciences, Duke University School of Medicine, Durham, North Carolina
| | - Ning Gu
- Duke Cancer Institute, Duke University Medical Center, Durham, North Carolina; Department of Population Health Sciences, Duke University School of Medicine, Durham, North Carolina
| | - Zhensheng Liu
- Duke Cancer Institute, Duke University Medical Center, Durham, North Carolina; Department of Population Health Sciences, Duke University School of Medicine, Durham, North Carolina
| | - Ting Xu
- Department of Radiation Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
| | - Daniel R Gomez
- Department of Radiation Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
| | - Ritsuko Komaki
- Department of Radiation Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
| | - Zhongxing Liao
- Department of Radiation Oncology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas
| | - Qingyi Wei
- Duke Cancer Institute, Duke University Medical Center, Durham, North Carolina; Department of Population Health Sciences, Duke University School of Medicine, Durham, North Carolina.
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Zhang Z, Jin F, Lian X, Li M, Wang G, Lan B, He H, Liu GD, Wu Y, Sun G, Xu CX, Yang ZZ. Genistein promotes ionizing radiation-induced cell death by reducing cytoplasmic Bcl-xL levels in non-small cell lung cancer. Sci Rep 2018; 8:328. [PMID: 29321496 PMCID: PMC5762702 DOI: 10.1038/s41598-017-18755-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 12/11/2017] [Indexed: 12/29/2022] Open
Abstract
Genistein (GEN) has been previously reported to enhance the radiosensitivity of cancer cells; however, the detailed mechanisms remain unclear. Here, we report that GEN treatment inhibits the cytoplasmic distribution of Bcl-xL and increases nuclear Bcl-xL in non-small cell lung cancer (NSCLC). Interestingly, our in vitro data show that ionizing radiation IR treatment significantly increases IR-induced DNA damage and apoptosis in a low cytoplasmic Bcl-xL NSCLC cell line compared to that of high cytoplasmic Bcl-xL cell lines. In addition, clinical data also show that the level of cytoplasmic Bcl-xL was negatively associated with radiosensitivity in NSCLC. Furthermore, we demonstrated that GEN treatment enhanced the radiosensitivity of NSCLC cells partially due to increases in Beclin-1-mediated autophagy by promoting the dissociation of Bcl-xL and Beclin-1. Taken together, these findings suggest that GEN can significantly enhance radiosensitivity by increasing apoptosis and autophagy due to inhibition of cytoplasmic Bcl-xL distribution and the interaction of Bcl-xL and Beclin-1 in NSCLC cells, respectively.
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Affiliation(s)
- Zhimin Zhang
- Cancer Center, Daping Hospital and Research Institute of Surgery, Third Military Medical University, Chongqing, 400042, China
| | - Feng Jin
- Cancer Center, Daping Hospital and Research Institute of Surgery, Third Military Medical University, Chongqing, 400042, China
| | - Xiaojuan Lian
- Department of tumor blood, Jiangjin central hospital of Chongqing, Chongqing, 400042, China
| | - Mengxia Li
- Cancer Center, Daping Hospital and Research Institute of Surgery, Third Military Medical University, Chongqing, 400042, China
| | - Ge Wang
- Cancer Center, Daping Hospital and Research Institute of Surgery, Third Military Medical University, Chongqing, 400042, China
| | - Baohua Lan
- Cancer Center, Daping Hospital and Research Institute of Surgery, Third Military Medical University, Chongqing, 400042, China
| | - Hao He
- Cancer Center, Daping Hospital and Research Institute of Surgery, Third Military Medical University, Chongqing, 400042, China
| | - Guo-Dong Liu
- Eighth Department, Daping Hospital and Research Institute of Surgery, Third Military Medical University, Chongqing, 400042, China
| | - Yan Wu
- Cancer Center, Daping Hospital and Research Institute of Surgery, Third Military Medical University, Chongqing, 400042, China
| | - Guiyin Sun
- Department of tumor blood, Jiangjin central hospital of Chongqing, Chongqing, 400042, China
| | - Cheng-Xiong Xu
- Cancer Center, Daping Hospital and Research Institute of Surgery, Third Military Medical University, Chongqing, 400042, China.
| | - Zhen-Zhou Yang
- Cancer Center, Daping Hospital and Research Institute of Surgery, Third Military Medical University, Chongqing, 400042, China.
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22
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Mueck K, Rebholz S, Harati MD, Rodemann HP, Toulany M. Akt1 Stimulates Homologous Recombination Repair of DNA Double-Strand Breaks in a Rad51-Dependent Manner. Int J Mol Sci 2017; 18:E2473. [PMID: 29156644 PMCID: PMC5713439 DOI: 10.3390/ijms18112473] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 11/03/2017] [Accepted: 11/03/2017] [Indexed: 12/28/2022] Open
Abstract
Akt1 is known to promote non-homologous end-joining (NHEJ)-mediated DNA double-strand break (DSB) repair by stimulation of DNA-PKcs. In the present study, we investigated the effect of Akt1 on homologous recombination (HR)-dependent repair of radiation-induced DSBs in non-small cell lung cancer (NSCLC) cells A549 and H460. Akt1-knockdown (Akt1-KD) significantly reduced Rad51 protein level, Rad51 foci formation and its colocalization with γH2AX foci after irradiation. Moreover, Akt1-KD decreased clonogenicity after treatment with Mitomycin C and HR repair, as tested by an HR-reporter assay. Double knockdown of Akt1 and Rad51 did not lead to a further decrease in HR compared to the single knockdown of Rad51. Consequently, Akt1-KD significantly increased the number of residual DSBs after irradiation partially independent of the kinase activity of DNA-PKcs. Likewise, the number of residual BRCA1 foci, indicating unsuccessful HR events, also significantly increased in the irradiated cells after Akt1-KD. Together, the results of the study indicate that Akt1 seems to be a regulatory component in the HR repair of DSBs in a Rad51-dependent manner. Thus, based on this novel role of Akt1 in HR and the previously described role of Akt1 in NHEJ, we propose that targeting Akt1 could be an effective approach to selectively improve the killing of tumor cells by DSB-inducing cytotoxic agents, such as ionizing radiation.
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Affiliation(s)
- Katharina Mueck
- Division of Radiobiology and Molecular Environmental Research, Department of Radiation Oncology, University of Tuebingen, 72076 Tuebingen, Germany.
- German Cancer Consortium (DKTK), Partner site Tuebingen, and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany.
| | - Simone Rebholz
- Division of Radiobiology and Molecular Environmental Research, Department of Radiation Oncology, University of Tuebingen, 72076 Tuebingen, Germany.
- German Cancer Consortium (DKTK), Partner site Tuebingen, and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany.
| | - Mozhgan Dehghan Harati
- Division of Radiobiology and Molecular Environmental Research, Department of Radiation Oncology, University of Tuebingen, 72076 Tuebingen, Germany.
- German Cancer Consortium (DKTK), Partner site Tuebingen, and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany.
| | - H Peter Rodemann
- Division of Radiobiology and Molecular Environmental Research, Department of Radiation Oncology, University of Tuebingen, 72076 Tuebingen, Germany.
- German Cancer Consortium (DKTK), Partner site Tuebingen, and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany.
| | - Mahmoud Toulany
- Division of Radiobiology and Molecular Environmental Research, Department of Radiation Oncology, University of Tuebingen, 72076 Tuebingen, Germany.
- German Cancer Consortium (DKTK), Partner site Tuebingen, and German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany.
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23
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Xin Y, Jiang F, Yang C, Yan Q, Guo W, Huang Q, Zhang L, Jiang G. Role of autophagy in regulating the radiosensitivity of tumor cells. J Cancer Res Clin Oncol 2017; 143:2147-2157. [DOI: 10.1007/s00432-017-2487-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Accepted: 07/27/2017] [Indexed: 11/28/2022]
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24
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Cancer Cell Death-Inducing Radiotherapy: Impact on Local Tumour Control, Tumour Cell Proliferation and Induction of Systemic Anti-tumour Immunity. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 930:151-72. [PMID: 27558821 DOI: 10.1007/978-3-319-39406-0_7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Radiotherapy (RT) predominantly is aimed to induce DNA damage in tumour cells that results in reduction of their clonogenicity and finally in tumour cell death. Adaptation of RT with higher single doses has become necessary and led to a more detailed view on what kind of tumour cell death is induced and which immunological consequences result from it. RT is capable of rendering tumour cells immunogenic by modifying the tumour cell phenotype and the microenvironment. Danger signals are released as well as the senescence-associated secretory phenotype. This results in maturation of dendritic cells and priming of cytotoxic T cells as well as in activation of natural killer cells. However, RT on the other hand can also result in immune suppressive events including apoptosis induction and foster tumour cell proliferation. That's why RT is nowadays increasingly combined with selected immunotherapies.
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25
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Ouyang YB, Ning S, Adler JR, Maciver B, Knox SJ, Giffard R. Alteration of Interneuron Immunoreactivity and Autophagic Activity in Rat Hippocampus after Single High-Dose Whole-Brain Irradiation. Cureus 2017; 9:e1414. [PMID: 28861331 PMCID: PMC5576964 DOI: 10.7759/cureus.1414] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The effects of high dose gamma radiation on brain tissue are poorly understood, with both limited and major changes reported. The present study compared the effects of gamma irradiation on the expression of interneuron markers within the hippocampal cornu ammonis 1 (CA1) region with expression in control matched rats. This area was chosen for study because of its well-characterized circuitry. Male Sprague-Dawley rats were exposed to 60 Gy of whole brain gamma radiation and after 24 or 48 hours, the brains were removed, fixed and sectioned to quantitate expression of parvalbumin (PV), calbindin-D28K (CB), reelin, neuropeptide-Y (NPY), and somatostatin. All of these markers increased in expression over the first 48 hours, except NPY, which decreased. This provides novel information on changes in gene expression in the hippocampal interneurons following radiation. Staining for Beclin 1, a marker of autophagy, increased most strongly in the subgranular zone (SGZ) of the dentate gyrus (DG). Overall, the results are consistent with the hypothesis that increased intracellular calcium follows irradiation, leading to an increased expression of calcium binding proteins. Increased autophagy occurs in the neurogenic zone of the dentate hilus, consistent with reduced effective neurogenesis after irradiation.
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Affiliation(s)
| | - Shoucheng Ning
- Department of Radiation Oncology, Stanford University Medical Center
| | - John R Adler
- Department of Neurosurgery, Stanford University School of Medicine
| | | | - Susan J Knox
- Department of Radiation Oncology, Stanford University Medical Center
| | - Rona Giffard
- Anesthesia, Stanford University School of Medicine
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26
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Wu Q, Allouch A, Martins I, Brenner C, Modjtahedi N, Deutsch E, Perfettini JL. Modulating Both Tumor Cell Death and Innate Immunity Is Essential for Improving Radiation Therapy Effectiveness. Front Immunol 2017; 8:613. [PMID: 28603525 PMCID: PMC5445662 DOI: 10.3389/fimmu.2017.00613] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Accepted: 05/09/2017] [Indexed: 12/17/2022] Open
Abstract
Radiation therapy is one of the cornerstones of cancer treatment. In tumor cells, exposure to ionizing radiation (IR) provokes DNA damages that trigger various forms of cell death such as apoptosis, necrosis, autophagic cell death, and mitotic catastrophe. IR can also induce cellular senescence that could serve as an additional antitumor barrier in a context-dependent manner. Moreover, accumulating evidence has demonstrated that IR interacts profoundly with tumor-infiltrating immune cells, which cooperatively drive treatment outcomes. Recent preclinical and clinical successes due to the combination of radiation therapy and immune checkpoint blockade have underscored the need for a better understanding of the interplay between radiation therapy and the immune system. In this review, we will present an overview of cell death modalities induced by IR, summarize the immunogenic properties of irradiated cancer cells, and discuss the biological consequences of IR on innate immune cell functions, with a particular attention on dendritic cells, macrophages, and NK cells. Finally, we will discuss their potential applications in cancer treatment.
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Affiliation(s)
- Qiuji Wu
- Cell Death and Aging Team, Gustave Roussy Cancer Campus, Villejuif, France.,Laboratory of Molecular Radiotherapy, INSERM U1030, Gustave Roussy Cancer Campus, Villejuif, France.,Gustave Roussy Cancer Campus, Villejuif, France.,Université Paris Saclay, Villejuif, France.,Department of Radiation and Medical Oncology, Zhongnan Hospital, Wuhan University, Wuhan, China.,Hubei Key Laboratory of Tumor Biological Behaviors, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Awatef Allouch
- Cell Death and Aging Team, Gustave Roussy Cancer Campus, Villejuif, France.,Laboratory of Molecular Radiotherapy, INSERM U1030, Gustave Roussy Cancer Campus, Villejuif, France.,Gustave Roussy Cancer Campus, Villejuif, France.,Université Paris Saclay, Villejuif, France
| | - Isabelle Martins
- Cell Death and Aging Team, Gustave Roussy Cancer Campus, Villejuif, France.,Laboratory of Molecular Radiotherapy, INSERM U1030, Gustave Roussy Cancer Campus, Villejuif, France.,Gustave Roussy Cancer Campus, Villejuif, France.,Université Paris Saclay, Villejuif, France
| | - Catherine Brenner
- Laboratory of Signaling and Cardiovascular Pathophysiology, INSERM UMR-S 1180, Université Paris-Sud, Faculté de Pharmacie, Châtenay-Malabry, France
| | - Nazanine Modjtahedi
- Laboratory of Molecular Radiotherapy, INSERM U1030, Gustave Roussy Cancer Campus, Villejuif, France.,Gustave Roussy Cancer Campus, Villejuif, France.,Université Paris Saclay, Villejuif, France
| | - Eric Deutsch
- Laboratory of Molecular Radiotherapy, INSERM U1030, Gustave Roussy Cancer Campus, Villejuif, France.,Gustave Roussy Cancer Campus, Villejuif, France.,Université Paris Saclay, Villejuif, France
| | - Jean-Luc Perfettini
- Cell Death and Aging Team, Gustave Roussy Cancer Campus, Villejuif, France.,Laboratory of Molecular Radiotherapy, INSERM U1030, Gustave Roussy Cancer Campus, Villejuif, France.,Gustave Roussy Cancer Campus, Villejuif, France.,Université Paris Saclay, Villejuif, France
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27
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Zhu H, Song H, Chen G, Yang X, Liu J, Ge Y, Lu J, Qin Q, Zhang C, Xu L, Di X, Cai J, Ma J, Zhang S, Sun X. eEF2K promotes progression and radioresistance of esophageal squamous cell carcinoma. Radiother Oncol 2017; 124:439-447. [PMID: 28431753 DOI: 10.1016/j.radonc.2017.04.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Revised: 03/06/2017] [Accepted: 04/02/2017] [Indexed: 01/10/2023]
Abstract
OBJECTIVES To investigate the biological function of eEF2K in esophageal squamous cell carcinoma (ESCC). MATERIALS AND METHODS Tissue microarrays containing 100 pairs of ESCC tumor and adjacent normal tissues were completed. Overexpression and knockdown of eEF2K were constructed in ECA-109 and TE-13 ESCC cells. DNA damage, cell viability, migration and invasion, radioresistance, apoptosis and autophagy were determined by immunofluorescence, CCK-8, transwell assay, colony formation assay, flow cytometry and western blot, respectively. Tumor growth and radioresistance were also evaluated using xenograft models created in nude mice. RESULTS eEF2K expression was higher in ESCC tissues compared with matched non-tumor tissues (P<0.05). Proliferation was increased in eEF2K overexpressing cells compared with controls (P<0.05), while silencing eEF2K reduced cell proliferation (P<0.05). Furthermore, lower levels of eEF2K expression correlated with slower migration and invasion rates (P<0.05), while higher levels of eEF2K expression with faster migration and invasion rates (P<0.05). eEF2K overexpression resulted in radioresistance and radiation-induced autophagy, and reduced radiation-induced apoptosis compared with controls, but silencing eEF2K promoted radiosensitivity and apoptosis, and reduced autophagy. In addition, eEF2K overexpression promoted the tumor growth in vivo (P<0.01). Combined treatment of NH125 (a pharmacological inhibitor of eEF2K) and radiation was more effective at delaying xenograft tumor growth than NH125 and radiation alone (P<0.05). CONCLUSION eEF2K induced progression and radioresistance in ESCC, which may be a novel therapeutic target for ESCC to increase radiosensitivity.
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Affiliation(s)
- Hongcheng Zhu
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, China
| | - Hongmei Song
- Department of Radiation Oncology, The Second Hospital of Lianyungang, Lianyungang Hospital Affiliated to Bengbu Medical College, China
| | - Guangzong Chen
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, China
| | - Xi Yang
- Department of Radiation Oncology, Fudan University Shanghai Cancer Center, China
| | - Jia Liu
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, China
| | - Yangyang Ge
- Department of Radiation Oncology, The Affiliated Tumor Hospital of Nantong University, China
| | - Jing Lu
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, China
| | - Qin Qin
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, China
| | - Chi Zhang
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, China
| | - Liping Xu
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, China
| | - Xiaoke Di
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, China
| | - Jing Cai
- Department of Radiation Oncology, The Affiliated Tumor Hospital of Nantong University, China
| | - Jianxin Ma
- Department of Radiation Oncology, The Second Hospital of Lianyungang, Lianyungang Hospital Affiliated to Bengbu Medical College, China
| | - Shu Zhang
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, China
| | - Xinchen Sun
- Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, China.
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28
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Hou W, Song L, Zhao Y, Liu Q, Zhang S. Inhibition of Beclin-1-Mediated Autophagy by MicroRNA-17-5p Enhanced the Radiosensitivity of Glioma Cells. Oncol Res 2017; 25:43-53. [PMID: 28081732 PMCID: PMC7840760 DOI: 10.3727/096504016x14719078133285] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The role of miRNAs in the radiosensitivity of glioma cells and the underlying mechanism is still far from clear. In the present study, we detected six downregulated and seven upregulated miRNAs in the serum after radiotherapy compared with paired serum samples before radiotherapy via miRNA panel PCR. Among these, miR-17-5p was highly reduced (fold change = −4.21). Further, we validated the levels of miR-17-5p in all serum samples with qRT-PCR. In addition, statistical analysis suggested that a reduced miR-17-5P level was positively associated with advanced clinical stage of glioma, incidence of relapse, and tumor differentiation. Moreover, we provided evidence that irradiation markedly activated autophagy and decreased miR-17-5p in the glioma cell line. Further, we demonstrated that irradiation-induced autophagy activation was mediated by beclin-1, and downregulation of beclin-1 via siRNA significantly abolished the irradiation-activated autophagy. Interestingly, we demonstrated that miR-17-5p could directly target beclin-1 via luciferase gene reporter assay. Exotic expression of miRNA-17-5p decreased autophagy activity in vitro. In nude mice, miRNA-17-5p upregulation sensitized the xenograft tumor to irradiation and suppressed irradiation-induced autophagy. Finally, pharmacal inhibition of autophagy markedly enhanced the cytotoxicity of irradiation in RR-U87 cells.
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29
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Xiong H, Nie X, Zou Y, Gong C, Li Y, Wu H, Qiu H, Yang L, Zhuang L, Zhang P, Zhang J, Wang Y, Xiong H. Twist1 Enhances Hypoxia Induced Radioresistance in Cervical Cancer Cells by Promoting Nuclear EGFR Localization. J Cancer 2017; 8:345-353. [PMID: 28261334 PMCID: PMC5332884 DOI: 10.7150/jca.16607] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2016] [Accepted: 10/29/2016] [Indexed: 01/02/2023] Open
Abstract
Twist1 is a crucial transcription factor that regulates epithelial mesenchymal transition and involves in metastasis. Recent evidence suggests that Twist1 plays important role in hypoxia-induced radioresistance, but the underlying mechanism remains elusive. Here we investigated the change of Twist1 expression in human cervical squamous cancer cell line SiHa after hypoxia treatment. We also explored the role of Twist1 in radioresistance by manipulating the expression level of Twist1. We observed that hypoxia treatment elevated the expression of Twist1 in SiHa cells. Knockdown of Twist1 with siRNA increased the radiosensitivity of SiHa cells under hypoxia condition, accompanied by reduced levels of nuclear Epidermal Growth Factor Receptor (EGFR) and DNA-dependent protein kinase (DNA-PK). Conversely, overexpression of Twist1 led to increased radioresistance of SiHa cells, which in turn increased nuclear EGFR localization and expression levels of nuclear DNA-PK. Moreover, concomitant high expression of hypoxia-inducible factor-1α (HIF-1α) and Twist1 in primary tumors of cervical cancer patients correlated with the worse prognosis after irradiation treatment. Taken together, these data provide new insights into molecular mechanism underlying hypoxia-induced radioresistance in cervical cancer cells, and suggest that Twist1 is a promising molecular target to improve the efficacy of cancer radiotherapy.
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Affiliation(s)
- Hua Xiong
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Xin Nie
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Yanmei Zou
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Chen Gong
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Yang Li
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Hua Wu
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Hong Qiu
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Lin Yang
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Liang Zhuang
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Peng Zhang
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Jing Zhang
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
| | - Yihua Wang
- Biological Sciences, Faculty of Natural and Environmental Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - Huihua Xiong
- Department of Oncology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei Province, China
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30
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Hu L, Wang H, Huang L, Zhao Y, Wang J. Crosstalk between autophagy and intracellular radiation response (Review). Int J Oncol 2016; 49:2217-2226. [PMID: 27748893 DOI: 10.3892/ijo.2016.3719] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 09/27/2016] [Indexed: 11/06/2022] Open
Abstract
Autophagy induced by radiation is critical to cell fate decision. Evidence now sheds light on the importance of autophagy induced by cancer radiotherapy. Traditional view considers radiation can directly or indirectly damage DNA which can activate DNA damage the repair signaling pathway, a large number of proteins participating in DNA damage repair signaling pathway such as p53, ATM, PARP1, FOXO3a, mTOR and SIRT1 involved in autophagy regulation. However, emerging recent evidence suggests radiation can also cause injury to extranuclear targets such as plasma membrane, mitochondria and endoplasmic reticulum (ER) and induce accumulation of ceramide, ROS, and Ca2+ concentration which activate many signaling pathways to modulate autophagy. Herein we review the role of autophagy in radiation therapy and the potent intracellular autophagic triggers induced by radiation. We aim to provide a more theoretical basis of radiation-induced autophagy, and provide novel targets for developing cytotoxic drugs to increase radiosensitivity.
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Affiliation(s)
- Lelin Hu
- Department of Radiation Oncology, Peking University Third Hospital, Haidian, Beijing 100191, P.R. China
| | - Hao Wang
- Department of Radiation Oncology, Peking University Third Hospital, Haidian, Beijing 100191, P.R. China
| | - Li Huang
- Department of Radiation Oncology, Peking University Third Hospital, Haidian, Beijing 100191, P.R. China
| | - Yong Zhao
- State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P.R. China
| | - Junjie Wang
- Department of Radiation Oncology, Peking University Third Hospital, Haidian, Beijing 100191, P.R. China
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31
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Patties I, Kortmann RD, Menzel F, Glasow A. Enhanced inhibition of clonogenic survival of human medulloblastoma cells by multimodal treatment with ionizing irradiation, epigenetic modifiers, and differentiation-inducing drugs. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2016; 35:94. [PMID: 27317342 PMCID: PMC4912728 DOI: 10.1186/s13046-016-0376-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 06/13/2016] [Indexed: 12/17/2022]
Abstract
Background Medulloblastoma (MB) is the most common pediatric brain tumor. Current treatment regimes consisting of primary surgery followed by radio- and chemotherapy, achieve 5-year overall survival rates of only about 60 %. Therapy-induced endocrine and neurocognitive deficits are common late adverse effects. Thus, improved antitumor strategies are urgently needed. In this study, we combined irradiation (IR) together with epigenetic modifiers and differentiation inducers in a multimodal approach to enhance the efficiency of tumor therapy in MB and also assessed possible late adverse effects on neurogenesis. Methods In three human MB cell lines (DAOY, MEB-Med8a, D283-Med) short-time survival (trypan blue exclusion assay), apoptosis, autophagy, cell cycle distribution, formation of gH2AX foci, and long-term reproductive survival (clonogenic assay) were analyzed after treatment with 5-aza-2′-deoxycytidine (5-azadC), valproic acid (VPA), suberanilohydroxamic acid (SAHA), abacavir (ABC), all-trans retinoic acid (ATRA) and resveratrol (RES) alone or combined with 5-aza-dC and/or IR. Effects of combinatorial treatments on neurogenesis were evaluated in cultured murine hippocampal slices from transgenic nestin-CFPnuc C57BL/J6 mice. Life imaging of nestin-positive neural stem cells was conducted at distinct time points for up to 28 days after treatment start. Results All tested drugs showed a radiosynergistic action on overall clonogenic survival at least in two-outof-three MB cell lines. This effect was pronounced in multimodal treatments combining IR, 5-aza-dC and a second drug. Hereby, ABC and RES induced the strongest reduction of clongenic survival in all three MB cell lines and led to the induction of apoptosis (RES, ABC) and/or autophagy (ABC). Additionally, 5-aza-dC, RES, and ABC increased the S phase cell fraction and induced the formation of gH2AX foci at least in oneout-of-three cell lines. Thereby, the multimodal treatment with 5-aza-dC, IR, and RES or ABC did not change the number of normal neural progenitor cells in murine slice cultures. Conclusion In conclusion, the radiosensitizing capacities of epigenetic and differentiation-inducing drugs presented here suggest that their adjuvant administration might improve MB therapy. Thereby, the combination of 5-aza-dC/IR with ABC and RES seemed to be the most promising to enhance tumor control without affecting the normal neural precursor cells.
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Affiliation(s)
- Ina Patties
- Department of Radiation Therapy, University of Leipzig, Stephanstraße 9a, Leipzig, 04103, Germany.
| | - Rolf-Dieter Kortmann
- Department of Radiation Therapy, University of Leipzig, Stephanstraße 9a, Leipzig, 04103, Germany
| | - Franziska Menzel
- Institute of Anatomy, University of Leipzig, Liebigstraße 13, 04103, Leipzig, Germany
| | - Annegret Glasow
- Department of Radiation Therapy, University of Leipzig, Stephanstraße 9a, Leipzig, 04103, Germany
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32
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Song L, Liu S, Zhang L, Yao H, Gao F, Xu D, Li Q. MiR-21 modulates radiosensitivity of cervical cancer through inhibiting autophagy via the PTEN/Akt/HIF-1α feedback loop and the Akt-mTOR signaling pathway. Tumour Biol 2016; 37:12161-12168. [PMID: 27220494 DOI: 10.1007/s13277-016-5073-3] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2016] [Accepted: 05/05/2016] [Indexed: 12/19/2022] Open
Abstract
MiR-21 is an important microRNA (miRNA) modulating radiosensitivity of cervical cancer cells. However, the underlying mechanism of miR-21 upregulation in radioresistant cervical cancer has not been fully understood. In addition, autophagy may either promote or alleviate radioresistance, depending on the types of cancer and tumor microenvironment. How autophagy affects radiosensitivity in cervical cancer and how miR-21 is involved in this process has not been reported. This study showed that miR-21 upregulation in radioresistant cervical cancer is related to HIF-1α overexpression. MiR-21 overexpression decreases PTEN, increases p-Akt, and subsequently increases HIF-1α expression, while miR-21 inhibition results in increased PTEN, decreased p-Akt, and then decreased HIF-1α. Therefore, we inferred that there is a HIF-1α-miR-21 positive feedback loop through the PTEN/Akt/HIF-1α pathway in cervical cancer cells. In addition, we also demonstrated that miR-21 confers decreased autophagy in cervical cancer cells after IR via the Akt-mTOR signaling pathway. Decreased autophagy is one of the potential mechanisms of increased radioresistance in cervical cancer cells. These findings expand our understanding of radioresistance development in cervical cancer.
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Affiliation(s)
- Lili Song
- Department of Obstetrics and Gynecology, Cangzhou Central Hospital, No.16, Xinhua West Road, Cangzhou, 061001, Hebei, China
| | - Shikai Liu
- Department of Obstetrics and Gynecology, Cangzhou Central Hospital, No.16, Xinhua West Road, Cangzhou, 061001, Hebei, China.
| | - Liang Zhang
- Department of Obstetrics and Gynecology, Cangzhou Central Hospital, No.16, Xinhua West Road, Cangzhou, 061001, Hebei, China
| | - Hairong Yao
- Department of Obstetrics and Gynecology, Cangzhou Central Hospital, No.16, Xinhua West Road, Cangzhou, 061001, Hebei, China
| | - Fangyuan Gao
- Department of Obstetrics and Gynecology, Cangzhou Central Hospital, No.16, Xinhua West Road, Cangzhou, 061001, Hebei, China
| | - Dongkui Xu
- Department of Obstetrics and Gynecology, Cangzhou Central Hospital, No.16, Xinhua West Road, Cangzhou, 061001, Hebei, China
| | - Qian Li
- Department of Obstetrics and Gynecology, Cangzhou Central Hospital, No.16, Xinhua West Road, Cangzhou, 061001, Hebei, China
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33
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CUI LI, SONG ZHIHENG, LIANG BING, JIA LILI, MA SHUMEI, LIU XIAODONG. Radiation induces autophagic cell death via the p53/DRAM signaling pathway in breast cancer cells. Oncol Rep 2016; 35:3639-47. [DOI: 10.3892/or.2016.4752] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 03/15/2016] [Indexed: 11/06/2022] Open
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34
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Cellular Pathways in Response to Ionizing Radiation and Their Targetability for Tumor Radiosensitization. Int J Mol Sci 2016; 17:ijms17010102. [PMID: 26784176 PMCID: PMC4730344 DOI: 10.3390/ijms17010102] [Citation(s) in RCA: 268] [Impact Index Per Article: 33.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 12/22/2015] [Accepted: 12/25/2015] [Indexed: 12/20/2022] Open
Abstract
During the last few decades, improvements in the planning and application of radiotherapy in combination with surgery and chemotherapy resulted in increased survival rates of tumor patients. However, the success of radiotherapy is impaired by two reasons: firstly, the radioresistance of tumor cells and, secondly, the radiation-induced damage of normal tissue cells located in the field of ionizing radiation. These limitations demand the development of drugs for either radiosensitization of tumor cells or radioprotection of normal tissue cells. In order to identify potential targets, a detailed understanding of the cellular pathways involved in radiation response is an absolute requirement. This review describes the most important pathways of radioresponse and several key target proteins for radiosensitization.
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35
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Luo J, Chen J, He L. mir-129-5p Attenuates Irradiation-Induced Autophagy and Decreases Radioresistance of Breast Cancer Cells by Targeting HMGB1. Med Sci Monit 2015; 21:4122-9. [PMID: 26720492 PMCID: PMC4700864 DOI: 10.12659/msm.896661] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND This study aimed to determine the role of miR-129-5p in irradiation-induced autophagy in breast cancer cells and to investigate its downstream regulation in autophagy-related radiosensitivity. MATERIAL AND METHODS Relative miR-129-5p expression in breast cancer cell lines MCF-7, MDA-MB-231, BT474, and BT549, and in 1 non-tumorigenic breast epithelial cell line, MCF-10A, was compared. The effect of miR-129-5p on irradiation-induced autophagy and radiosensitivity of the cancer cells was explored. The regulative effect of miR-129-5p on HMGB1 and the functional role of this axis in autophagy and radiosensitivity were also studied. RESULTS Ectopic expression of miR-129-5p sensitized MDA-MD-231 cells to irradiation, while knockdown of miR-129-5p reduced radiosensitivity of MCF-7 cells. MiR-129-5p overexpression inhibited irradiation-induced autophagy. HMGB1 is a direct functional target of miR-129-5p in breast cancer cells. MiR-129-5p may suppress autophagy and decrease radioresistance of breast cancer cells by targeting HMGB1. CONCLUSIONS The miR-129-5p/HMGB1 axis can regulate irradiation-induced autophagy in breast cancer and might be an important pathway in regulating radiosensitivity of breast cancer cells.
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Affiliation(s)
- Jing Luo
- Department of Breast Surgery, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, School of Clinical Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China (mainland)
| | - Jie Chen
- Graduate School, Zunyi Medical University, Zunyi, Guizhou, China (mainland)
| | - Li He
- Department of Breast Surgery, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital (East), School of Clinical Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan, China (mainland)
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Miao XD, Cao L, Zhang Q, Hu XY, Zhang Y. Effect of PI3K-mediated autophagy in human osteosarcoma MG63 cells on sensitivity to chemotherapy with cisplatin. ASIAN PAC J TROP MED 2015; 8:731-8. [DOI: 10.1016/j.apjtm.2015.07.024] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 07/20/2015] [Accepted: 07/20/2015] [Indexed: 10/23/2022] Open
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Yang Y, Sun X, Yang Y, Yang X, Zhu H, Dai S, Chen X, Zhang H, Guo Q, Song Y, Wang F, Cheng H, Sun X. Gambogic acid enhances the radiosensitivity of human esophageal cancer cells by inducing reactive oxygen species via targeting Akt/mTOR pathway. Tumour Biol 2015; 37:1853-62. [PMID: 26318432 DOI: 10.1007/s13277-015-3974-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 08/21/2015] [Indexed: 12/16/2022] Open
Abstract
Radiotherapy is a widespread treatment in human solid tumors. However, therapy resistance and poor prognosis are still problems. Gambogic acid (GA), extracted from the dried yellow resin of gamboges, has an anticancer effect against various types of cancer cells. To explore the radiosensitivity of GA on esophageal cancer cell line TE13, cell viability was tested by Cell Counting Kit-8 (CCK-8) assay, colony formation assay was used to assess the effects of GA on the radiosensitivity of TE13, and flow cytometry was performed to meter the percentage of apoptosis. The protein levels of microtubule-associated protein 1 light chain 3 (LC3), caspase3, caspase8, casepase9, pAkt, and p-mammalian target of rapamycin (p-mTOR) were tested using Western blot. The distribution of LC3 was detected by immunofluorescence. Additionally, we also examined reactive oxygen species (ROS) expression by laser scanning confocal microscope (LSCM). The cells were transfected with adenovial vector to monitor the autophagy through the expression of green fluorescent protein (GFP-red fluroscent protein (RFP)-LC3. The rates of apoptotic cells in combined-treated TE13 increased significantly compared with the control groups in accordance with the results of Western blot. The clonogenic survival assay showed that GA enhances radiosensitivity with a sensitizing enhancement ratio (SER) of 1.217 and 1.436 at different concentrations. The LC3-II protein level increased in the combined group indicating the increase of autophagy incidence, and the results of GFP-RFP-LC3 experiment showed that GA may block the process of autophagic flux in TE13 cells. Moreover, we successfully demonstrated that ROS is involved in the induction of autophagy. ROS-mediated autophagy depends on the inhibition of the Akt/mTOR pathway. Taken together, GA induced radiosensitivity involves autophagy and apoptosis which are regulated by ROS hypergeneration and Akt/mTOR inhibition.
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Affiliation(s)
- Yan Yang
- Department of Radiotherapy, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Xiangdong Sun
- Department of Radiotherapy, The 81st Hospital of PLA, Nanjing, Jiangsu Province, China
| | - Yuehua Yang
- Department of Radiotherapy, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Xi Yang
- Department of Radiotherapy, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Hongcheng Zhu
- Department of Radiotherapy, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Shengbin Dai
- Department of Oncology, People's Hospital of Taizhou, Taizhou, Jiangsu Province, China
| | - Xiaochen Chen
- Department of Radiotherapy, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Hao Zhang
- Department of Radiotherapy, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Qing Guo
- Department of Radiotherapy, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China.,Department of Oncology, People's Hospital of Taizhou, Taizhou, Jiangsu Province, China
| | - Yaqi Song
- Department of Radiation Oncology, Huai'an First People's Hospital, Nanjing Medical University, Nanjing, Jiangsu, 223300, China
| | - Feng Wang
- Department of Radiation Oncology, Nantong Tumor Hospital, Affiliated Tumor Hospital of Nantong University, Nantong, 226321, China
| | - Hongyan Cheng
- Department of Synthetic Internal Medicine, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Xinchen Sun
- Department of Radiotherapy, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, China.
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