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Averbeck D. Low-Dose Non-Targeted Effects and Mitochondrial Control. Int J Mol Sci 2023; 24:11460. [PMID: 37511215 PMCID: PMC10380638 DOI: 10.3390/ijms241411460] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 06/26/2023] [Accepted: 06/29/2023] [Indexed: 07/30/2023] Open
Abstract
Non-targeted effects (NTE) have been generally regarded as a low-dose ionizing radiation (IR) phenomenon. Recently, regarding long distant abscopal effects have also been observed at high doses of IR) relevant to antitumor radiation therapy. IR is inducing NTE involving intracellular and extracellular signaling, which may lead to short-ranging bystander effects and distant long-ranging extracellular signaling abscopal effects. Internal and "spontaneous" cellular stress is mostly due to metabolic oxidative stress involving mitochondrial energy production (ATP) through oxidative phosphorylation and/or anaerobic pathways accompanied by the leakage of O2- and other radicals from mitochondria during normal or increased cellular energy requirements or to mitochondrial dysfunction. Among external stressors, ionizing radiation (IR) has been shown to very rapidly perturb mitochondrial functions, leading to increased energy supply demands and to ROS/NOS production. Depending on the dose, this affects all types of cell constituents, including DNA, RNA, amino acids, proteins, and membranes, perturbing normal inner cell organization and function, and forcing cells to reorganize the intracellular metabolism and the network of organelles. The reorganization implies intracellular cytoplasmic-nuclear shuttling of important proteins, activation of autophagy, and mitophagy, as well as induction of cell cycle arrest, DNA repair, apoptosis, and senescence. It also includes reprogramming of mitochondrial metabolism as well as genetic and epigenetic control of the expression of genes and proteins in order to ensure cell and tissue survival. At low doses of IR, directly irradiated cells may already exert non-targeted effects (NTE) involving the release of molecular mediators, such as radicals, cytokines, DNA fragments, small RNAs, and proteins (sometimes in the form of extracellular vehicles or exosomes), which can induce damage of unirradiated neighboring bystander or distant (abscopal) cells as well as immune responses. Such non-targeted effects (NTE) are contributing to low-dose phenomena, such as hormesis, adaptive responses, low-dose hypersensitivity, and genomic instability, and they are also promoting suppression and/or activation of immune cells. All of these are parts of the main defense systems of cells and tissues, including IR-induced innate and adaptive immune responses. The present review is focused on the prominent role of mitochondria in these processes, which are determinants of cell survival and anti-tumor RT.
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Affiliation(s)
- Dietrich Averbeck
- Laboratory of Cellular and Molecular Radiobiology, PRISME, UMR CNRS 5822/IN2P3, IP2I, Lyon-Sud Medical School, University Lyon 1, 69921 Oullins, France
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Shimura T. Mitochondrial Signaling Pathways Associated with DNA Damage Responses. Int J Mol Sci 2023; 24:ijms24076128. [PMID: 37047099 PMCID: PMC10094106 DOI: 10.3390/ijms24076128] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 03/14/2023] [Accepted: 03/23/2023] [Indexed: 04/14/2023] Open
Abstract
Under physiological and stress conditions, mitochondria act as a signaling platform to initiate biological events, establishing communication from the mitochondria to the rest of the cell. Mitochondrial adenosine triphosphate (ATP), reactive oxygen species, cytochrome C, and damage-associated molecular patterns act as messengers in metabolism, oxidative stress response, bystander response, apoptosis, cellular senescence, and inflammation response. In this review paper, the mitochondrial signaling in response to DNA damage was summarized. Mitochondrial clearance via fusion, fission, and mitophagy regulates mitochondrial quality control under oxidative stress conditions. On the other hand, damaged mitochondria release their contents into the cytoplasm and then mediate various signaling pathways. The role of mitochondrial dysfunction in radiation carcinogenesis was discussed, and the recent findings on radiation-induced mitochondrial signaling and radioprotective agents that targeted mitochondria were presented. The analysis of the mitochondrial radiation effect, as hypothesized, is critical in assessing radiation risks to human health.
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Affiliation(s)
- Tsutomu Shimura
- Department of Environmental Health, National Institute of Public Health, Wako 351-0197, Saitama, Japan
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Ait-Aissa K, Koval OM, Lindsey NR, Grumbach IM. Mitochondrial Ca 2+ Uptake Drives Endothelial Injury By Radiation Therapy. Arterioscler Thromb Vasc Biol 2022; 42:1121-1136. [PMID: 35899616 PMCID: PMC9394506 DOI: 10.1161/atvbaha.122.317869] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 06/20/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND Radiation therapy strongly increases the risk of atherosclerotic vascular disease, such as carotid stenosis. Radiation induces DNA damage, in particular in mitochondria, but the upstream and downstream signaling events are poorly understood. The objective of this study was to define such mechanisms. METHODS Endothelial-specific MCU (mitochondrial Ca2+ uniporter) knockout and C57Bl6/J mice with or without a preinfusion of a mitoTEMPO (mitochondrial reactive oxygen species [ROS] scavenger) were exposed to a single dose of cranial irradiation. 24, and 240 hours postirradiation, vascular reactivity, endothelial function, and mitochondrial integrity were assessed ex vivo and in vitro. RESULTS In cultured human endothelial cells, irradiation with 4 Gy increased cytosolic Ca2+ transients and the mitochondrial Ca2+ concentration ([Ca2+]mt) and activated MCU. These outcomes correlated with increases in mitochondrial ROS (mtROS), loss of NO production, and sustained damage to mitochondrial but not nuclear DNA. Moreover, irradiation impaired activity of the ETC (electron transport chain) and the transcription of ETC subunits encoded by mitochondrial DNA (mtDNA). Knockdown or pharmacological inhibition of MCU blocked irradiation-induced mtROS production, mtDNA damage, loss of NO production, and impairment of ETC activity. Similarly, the pretreatment with mitoTEMPO, a scavenger of mtROS, reduced irradiation-induced Ca2+ entry, and preserved both the integrity of the mtDNA and the production of NO, suggesting a feed-forward loop involving [Ca2+]m and mtROS. Enhancement of DNA repair in mitochondria, but not in the nucleus, was sufficient to block prolonged mtROS elevations and maintain NO production. Consistent with the findings from cultured cells, in C57BL/6J mice, head and neck irradiation decreased endothelium-dependent vasodilation, and mtDNA integrity in the carotid artery after irradiation. These effects were prevented by endothelial knockout of MCU or infusion with mitoTEMPO. CONCLUSIONS Irradiation-induced damage to mtDNA is driven by MCU-dependent Ca2+ influx and the generation of mtROS. Such damage leads to reduced transcription of mitochondrial genes and activity of the ETC, promoting sustained mtROS production that induces endothelial dysfunction. Our findings suggest that targeting MCU and mtROS might be sufficient to mitigate irradiation-induced vascular disease.
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Affiliation(s)
- Karima Ait-Aissa
- Abboud Cardiovascular Research Center, Department of Internal Medicine (K.A.A., O.M.K., N.R.L., I.M.G.), Carver College of Medicine, University of Iowa
| | - Olha M. Koval
- Abboud Cardiovascular Research Center, Department of Internal Medicine (K.A.A., O.M.K., N.R.L., I.M.G.), Carver College of Medicine, University of Iowa
| | - Nathanial R. Lindsey
- Abboud Cardiovascular Research Center, Department of Internal Medicine (K.A.A., O.M.K., N.R.L., I.M.G.), Carver College of Medicine, University of Iowa
| | - Isabella M. Grumbach
- Abboud Cardiovascular Research Center, Department of Internal Medicine (K.A.A., O.M.K., N.R.L., I.M.G.), Carver College of Medicine, University of Iowa
- Free Radical and Radiation Biology Program, Department of Radiation Oncology (I.M.G.), Carver College of Medicine, University of Iowa
- Iowa City VA Healthcare System, Iowa City (I.M.G.)
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Tang Y, Zhang Z, Chen Y, Qin S, Zhou L, Gao W, Shen Z. Metabolic Adaptation-Mediated Cancer Survival and Progression in Oxidative Stress. Antioxidants (Basel) 2022; 11:antiox11071324. [PMID: 35883815 PMCID: PMC9311581 DOI: 10.3390/antiox11071324] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 06/27/2022] [Accepted: 06/28/2022] [Indexed: 02/05/2023] Open
Abstract
Undue elevation of ROS levels commonly occurs during cancer evolution as a result of various antitumor therapeutics and/or endogenous immune response. Overwhelming ROS levels induced cancer cell death through the dysregulation of ROS-sensitive glycolytic enzymes, leading to the catastrophic depression of glycolysis and oxidative phosphorylation (OXPHOS), which are critical for cancer survival and progression. However, cancer cells also adapt to such catastrophic oxidative and metabolic stresses by metabolic reprograming, resulting in cancer residuality, progression, and relapse. This adaptation is highly dependent on NADPH and GSH syntheses for ROS scavenging and the upregulation of lipolysis and glutaminolysis, which fuel tricarboxylic acid cycle-coupled OXPHOS and biosynthesis. The underlying mechanism remains poorly understood, thus presenting a promising field with opportunities to manipulate metabolic adaptations for cancer prevention and therapy. In this review, we provide a summary of the mechanisms of metabolic regulation in the adaptation of cancer cells to oxidative stress and the current understanding of its regulatory role in cancer survival and progression.
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Affiliation(s)
- Yongquan Tang
- Department of Pediatric Surgery, West China Hospital, Sichuan University, Chengdu 610041, China;
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Collaborative Innovation Center for Biotherapy, Chengdu 610041, China; (Z.Z.); (Y.C.); (S.Q.); (L.Z.)
| | - Zhe Zhang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Collaborative Innovation Center for Biotherapy, Chengdu 610041, China; (Z.Z.); (Y.C.); (S.Q.); (L.Z.)
| | - Yan Chen
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Collaborative Innovation Center for Biotherapy, Chengdu 610041, China; (Z.Z.); (Y.C.); (S.Q.); (L.Z.)
| | - Siyuan Qin
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Collaborative Innovation Center for Biotherapy, Chengdu 610041, China; (Z.Z.); (Y.C.); (S.Q.); (L.Z.)
| | - Li Zhou
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Collaborative Innovation Center for Biotherapy, Chengdu 610041, China; (Z.Z.); (Y.C.); (S.Q.); (L.Z.)
| | - Wei Gao
- Clinical Medical College & Affiliated Hospital of Chengdu University, Chengdu University, Chengdu 610106, China
- Correspondence: (W.G.); (Z.S.)
| | - Zhisen Shen
- Department of Otorhinolaryngology and Head and Neck Surgery, The Affiliated Lihuili Hospital, Ningbo University, Ningbo 315040, China
- Correspondence: (W.G.); (Z.S.)
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Luukkonen J, Höytö A, Sokka M, Syväoja J, Juutilainen J, Naarala J. Genomic instability induced by radiation-mimicking chemicals is not associated with persistent mitochondrial degeneration. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2022; 61:29-36. [PMID: 34331120 PMCID: PMC8897345 DOI: 10.1007/s00411-021-00927-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Accepted: 06/21/2021] [Indexed: 06/13/2023]
Abstract
Ionizing radiation has been shown to cause induced genomic instability (IGI), which is defined as a persistently increased rate of genomic damage in the progeny of the exposed cells. In this study, IGI was investigated by exposing human SH-SY5Y neuroblastoma cells to hydroxyurea and zeocin, two chemicals mimicking different DNA-damaging effects of ionizing radiation. The aim was to explore whether IGI was associated with persistent mitochondrial dysfunction. Changes to mitochondrial function were assessed by analyzing mitochondrial superoxide production, mitochondrial membrane potential, and mitochondrial activity. The formation of micronuclei was used to determine immediate genetic damage and IGI. Measurements were performed either immediately, 8 days, or 15 days following exposure. Both hydroxyurea and zeocin increased mitochondrial superoxide production and affected mitochondrial activity immediately after exposure, and mitochondrial membrane potential was affected by zeocin, but no persistent changes in mitochondrial function were observed. IGI became manifested 15 days after exposure in hydroxyurea-exposed cells. In conclusion, immediate responses in mitochondrial function did not cause persistent dysfunction of mitochondria, and this dysfunction was not required for IGI in human neuroblastoma cells.
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Affiliation(s)
- Jukka Luukkonen
- Department of Environmental and Biological Sciences, University of Eastern Finland, Yliopistonranta 1, P.O. Box 1627, 70211, Kuopio, Finland.
| | - Anne Höytö
- Department of Environmental and Biological Sciences, University of Eastern Finland, Yliopistonranta 1, P.O. Box 1627, 70211, Kuopio, Finland
- STUK-Radiation and Nuclear Safety Authority, Helsinki, Finland
| | - Miiko Sokka
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI, USA
| | - Juhani Syväoja
- Institute of Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Jukka Juutilainen
- Department of Environmental and Biological Sciences, University of Eastern Finland, Yliopistonranta 1, P.O. Box 1627, 70211, Kuopio, Finland
| | - Jonne Naarala
- Department of Environmental and Biological Sciences, University of Eastern Finland, Yliopistonranta 1, P.O. Box 1627, 70211, Kuopio, Finland
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Yang P, Qu X, Qi S, Li G, Wang S. Oral administration of inorganic nitrate alleviated biological damage induced by cone-beam computed tomography examination in Wistar rats. Nitric Oxide 2022; 122-123:19-25. [PMID: 35219774 DOI: 10.1016/j.niox.2022.02.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2021] [Revised: 02/17/2022] [Accepted: 02/22/2022] [Indexed: 01/18/2023]
Abstract
OBJECTIVES To explore whether the inorganic nitrate has a protective effect on biological damage induced by cone-beam computed tomography (CBCT) and compare it with Vitamin C. MATERIALS AND METHODS Sixty Wistar rats were randomly separated into 6 groups: control group, irradiation (IR) group, NaNO3 group, IR + NaNO3 group, Vitamin C group, and IR + Vitamin C group. Rats were whole-body irradiated with CBCT four times. The absorbed dose of the skin surface was measured using thermoluminescent dosemeter chips and the mean whole-body absorbed dose was calculated. Peripheral blood was collected at 0.5h and 24h after irradiation. Bodyweight and organ index of rats before and after irradiation were analyzed. The bone marrow was taken for micronucleus test. Lymphocytes were isolated from peripheral blood for γ-H2AX immunofluorescence assay, apoptosis and reactive oxygen species (ROS) analysis. Total antioxidant capacity (TAC), malondialdehyde (MDA) and superoxide dismutase (SOD) in serum were detected. RESULTS The mean absorbed dose of four whole-body CBCT scans for rats was 73.04 mGy. Bodyweight and organ index before and after irradiation with X-ray had no significant differences. The micronuclei frequency of IR + NaNO3 and IR + Vitamin C groups showed a significant decrease than that in the IR group, which was not significantly different from that of the control group. The γ-H2AX foci rates in the IR + NaNO3 group and the IR + Vitamin C group were significantly lower than that in the IR group. In addition, the foci rate of the IR + NaNO3 group returned to the baseline level of the control group 24h after CBCT scanning. The apoptosis of lymphocytes in rats did not increase. The IR + NaNO3 group (P < 0.001) or IR + Vitamin C group (P < 0.001) showed a significant increase in ROS positive cells rate with the control group, while were significantly lower than those in the IR group (P < 0.01). In addition, the ROS-positive cell rate in the IR + NaNO3 group was significantly lower than that in the IR + Vitamin C group. The MDA in the serum of rats increased significantly, while SOD and TAC decreased significantly at 0.5h after irradiation. CONCLUSIONS Compared with Vitamin C, inorganic nitrate had better preventive effects on biological damage induced by CBCT scans in rats.
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Affiliation(s)
- Pan Yang
- Salivary Gland Disease Center and Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Beijing Laboratory of Oral Health, Capital Medical University, Beijing, 100050, China
| | - Xingmin Qu
- Department of Pediatric Dentistry, School of Stomatology, Capital Medical University, Beijing, 100050, China
| | - Senrong Qi
- Department of Oral and Maxillofacial Radiology, School of Stomatology, Capital Medical University, Beijing, 100050, China
| | - Gang Li
- Department of Oral and Maxillofacial Radiology, Peking University School and Hospital of Stomatology, Beijing, 100081, China
| | - Songlin Wang
- Salivary Gland Disease Center and Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Beijing Laboratory of Oral Health, Capital Medical University, Beijing, 100050, China.
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Averbeck D, Rodriguez-Lafrasse C. Role of Mitochondria in Radiation Responses: Epigenetic, Metabolic, and Signaling Impacts. Int J Mol Sci 2021; 22:ijms222011047. [PMID: 34681703 PMCID: PMC8541263 DOI: 10.3390/ijms222011047] [Citation(s) in RCA: 70] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 09/24/2021] [Accepted: 10/08/2021] [Indexed: 12/15/2022] Open
Abstract
Until recently, radiation effects have been considered to be mainly due to nuclear DNA damage and their management by repair mechanisms. However, molecular biology studies reveal that the outcomes of exposures to ionizing radiation (IR) highly depend on activation and regulation through other molecular components of organelles that determine cell survival and proliferation capacities. As typical epigenetic-regulated organelles and central power stations of cells, mitochondria play an important pivotal role in those responses. They direct cellular metabolism, energy supply and homeostasis as well as radiation-induced signaling, cell death, and immunological responses. This review is focused on how energy, dose and quality of IR affect mitochondria-dependent epigenetic and functional control at the cellular and tissue level. Low-dose radiation effects on mitochondria appear to be associated with epigenetic and non-targeted effects involved in genomic instability and adaptive responses, whereas high-dose radiation effects (>1 Gy) concern therapeutic effects of radiation and long-term outcomes involving mitochondria-mediated innate and adaptive immune responses. Both effects depend on radiation quality. For example, the increased efficacy of high linear energy transfer particle radiotherapy, e.g., C-ion radiotherapy, relies on the reduction of anastasis, enhanced mitochondria-mediated apoptosis and immunogenic (antitumor) responses.
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Affiliation(s)
- Dietrich Averbeck
- Laboratory of Cellular and Molecular Radiobiology, PRISME, UMR CNRS 5822/IN2P3, IP2I, Lyon-Sud Medical School, University Lyon 1, 69921 Oullins, France;
- Correspondence:
| | - Claire Rodriguez-Lafrasse
- Laboratory of Cellular and Molecular Radiobiology, PRISME, UMR CNRS 5822/IN2P3, IP2I, Lyon-Sud Medical School, University Lyon 1, 69921 Oullins, France;
- Department of Biochemistry and Molecular Biology, Lyon-Sud Hospital, Hospices Civils de Lyon, 69310 Pierre-Bénite, France
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Meng Q, Zaharieva EK, Sasatani M, Kobayashi J. Possible relationship between mitochondrial changes and oxidative stress under low dose-rate irradiation. Redox Rep 2021; 26:160-169. [PMID: 34435550 PMCID: PMC8405122 DOI: 10.1080/13510002.2021.1971363] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Objectives: High dose-rate ionizing radiation (IR) causes severe DSB damage, as well as reactive oxygen species (ROS) accumulation and oxidative stress. However, it is unknown what biological processes are affected by low dose-rate IR; therefore, the molecular relationships between mitochondria changes and oxidative stress in human normal cells was investigated after low dose-rate IR.Methods: We compared several cellular response between high and low dose-rate irradiation using cell survival assay, ROS/RNS assay, immunofluorescence and western blot analysis.Results: Reduced DSB damage and increased levels of ROS, with subsequent oxidative stress responses, were observed in normal cells after low dose-rate IR. Low dose-rate IR caused several mitochondrial changes, including morphology mass, and mitochondrial membrane potential, suggesting that mitochondrial damage was caused. Although damaged mitochondria were removed by mitophagy to stop ROS leakage, the mitophagy-regulatory factor, PINK1, was reduced following low dose-rate IR. Although mitochondrial dynamics (fission/fusion events) are important for the proper mitophagy process, some mitochondrial fusion factors decreased following low dose-rate IR.Discussion: The dysfunction of mitophagy pathway under low dose-rate IR increased ROS and the subsequent activation of the oxidative stress response.
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Affiliation(s)
- Qingmei Meng
- Department of Interdisciplinary Environment, Graduate School of Human and Environmental Sciences, Kyoto University, Yoshidanihonmatsucho, Sakyo-ku, Kyoto, Japan
| | - Elena Karamfilova Zaharieva
- Department of Experimental Oncology, Research Institute for Radiation Biology and Medicine (RIRBM), Hiroshima University, Hiroshima, Japan
| | - Megumi Sasatani
- Department of Experimental Oncology, Research Institute for Radiation Biology and Medicine (RIRBM), Hiroshima University, Hiroshima, Japan
| | - Junya Kobayashi
- Department of Interdisciplinary Environment, Graduate School of Human and Environmental Sciences, Kyoto University, Yoshidanihonmatsucho, Sakyo-ku, Kyoto, Japan.,Department of Radiological Sciences, School of Health Sciences at Narita, International University of Health and Welfare, Narita, Japan
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Dawood A, Mothersill C, Seymour C. Low dose ionizing radiation and the immune response: what is the role of non-targeted effects? Int J Radiat Biol 2021; 97:1368-1382. [PMID: 34330196 DOI: 10.1080/09553002.2021.1962572] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVES This review aims to trace the historical narrative surrounding the low dose effects of radiation on the immune system and how our understanding has changed from the beginning of the 20th century to now. The particular focus is on the non-targeted effects (NTEs) of low dose ionizing radiation (LDIR) which are effects that occur when irradiated cells emit signals that cause effects in the nearby or distant non-irradiated cells known as radiation induced bystander effect (RIBE). Moreover, radiation induced genomic instability (RIGI) and abscopal effect (AE) also regarded as NTE. This was prompted by our recent discovery that ultraviolet A (UVA) photons are emitted by the irradiated cells and that these photons can trigger NTE such as the RIBE in unirradiated recipients of these photons. Given the well-known association between UV radiation and the immune response, where these biophotons may pose as bystander signals potentiating processes in deep tissues as a consequence of LDIR, it is timely to review the field with a fresh lens. Various pathways and immune components that contribute to the beneficial and adverse types of modulation induced by LDR will also be revisited. CONCLUSION There is limited evidence for LDIR induced immune effects by way of a non-targeted mechanism in biological tissue. The literature examining low to medium dose effects of ionizing radiation on the immune system and its components is complex and controversial. Early work was compromised by lack of good dosimetry while later work mainly looks at the involvement of immune response in radiotherapy. There is a lack of research in the LDIR/NTE field focusing on immune response although bone marrow stem cells and lineages were critical in the identification and characterization of NTE where effects like RIGI and RIBE were heavily researched. This may be in part, a result of the difficulty of isolating NTE in whole organisms which are essential for good immune response studies. Models involving inter organism transmission of NTE are a promising route to overcome these issues.
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Affiliation(s)
- Annum Dawood
- Department of Physics and Astronomy, McMaster University, Hamilton, Canada
| | | | - Colin Seymour
- Department of Biology, McMaster University, Hamilton, Canada
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Sheikholeslami S, Aryafar T, Abedi-Firouzjah R, Banaei A, Dorri-Giv M, Zamani H, Ataei G, Majdaeen M, Farhood B. The role of melatonin on radiation-induced pneumonitis and lung fibrosis: A systematic review. Life Sci 2021; 281:119721. [PMID: 34146555 DOI: 10.1016/j.lfs.2021.119721] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Revised: 05/19/2021] [Accepted: 06/07/2021] [Indexed: 12/24/2022]
Abstract
PURPOSE Pneumonitis and lung fibrosis, as the most common compliances of lung irradiation, can affect the quality of life. The use of radio-protective agents can ameliorate these injuries. This study aimed to review the potential protective role of melatonin in the treatment of radiation-induced Pneumonitis and lung fibrosis. METHODS The current systematic study was conducted based on PRISMA guidelines to identify relevant literature on " the effect of melatonin on radiation-induced pneumonitis and lung fibrosis" in the electronic databases of Web of Science, Embase, PubMed, and Scopus up to January 2021. Eighty-one articles were screened in accordance with the inclusion and exclusion criteria of the study. Finally, eight articles were included in this systematic review. RESULTS The finding showed that the lung irradiation-induced pneumonitis and lung fibrosis. The co-treatment with melatonin could alleviate these compliances through its anti-oxidant and anti-inflammatory actions. Melatonin through upregulation of some enzymes such as catalase, superoxide dismutase, glutathione, NADPH oxidases 2 and 4, dual oxidases 1 and 2, and also downregulation of malondialdehyde reduced oxidative stress following lung radiation. Moreover, melatonin through its anti-inflammatory effects, can attenuate the increased levels of nuclear factor kappa B, tumor necrosis factor alpha, transforming growth factor beta 1, SMAD2, interleukin (IL)-4, IL-4 receptor-a1 (IL4ra1), and IL-1 beta following lung radiation. The histological damages induced by ionizing radiation were also alleviated by co-treatment with melatonin. CONCLUSION According to the obtained results, it was found that melatonin can have anti-pneumonitis and anti-fibrotic following lung irradiation.
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Affiliation(s)
- Sahar Sheikholeslami
- Department of Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Tayebeh Aryafar
- Department of Radiation Sciences, Yasuj University of Medical Sciences, Yasuj, Iran
| | | | - Amin Banaei
- Department of Medical Physics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Masoumeh Dorri-Giv
- Nuclear Medicine Research Center, Department of Nuclear Medicine, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hamed Zamani
- Department of Medical Physics, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Gholamreza Ataei
- Department of Radiology Technology, Faculty of Paramedical Sciences, Babol University of Medical Science, Babol, Iran
| | - Mehrsa Majdaeen
- Department of Radiotherapy and Oncology, Razi Hospital, Guilan University of Medical Sciences, Rasht, Iran.
| | - Bagher Farhood
- Department of Medical Physics and Radiology, Faculty of Paramedical Sciences, Kashan University of Medical Sciences, Kashan, Iran.
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Sheikholeslami S, Khodaverdian S, Dorri-Giv M, Mohammad Hosseini S, Souri S, Abedi-Firouzjah R, Zamani H, Dastranj L, Farhood B. The radioprotective effects of alpha-lipoic acid on radiotherapy-induced toxicities: A systematic review. Int Immunopharmacol 2021; 96:107741. [PMID: 33989970 DOI: 10.1016/j.intimp.2021.107741] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 04/16/2021] [Accepted: 04/27/2021] [Indexed: 12/13/2022]
Abstract
PURPOSE Radiation therapy is one of the main cancer treatment modalities applied in 50-70% of cancer patients. Despite the many advantages of this treatment, such as non-invasiveness, organ-preservation, and spatiotemporal flexibility in tumor targeting, it can lead to complications in irradiated healthy cells/tissues. In this regard, the use of radio-protective agents can alleviate radiation-induced complications. This study aimed to review the potential role of alpha-lipoic acid in the prevention/reduction of radiation-induced toxicities on healthy cells/tissues. METHODS A systematic search was performed following PRISMA guidelines to identify relevant literature on the "role of alpha-lipoic acid in the treatment of radiotherapy-induced toxicity" in the electronic databases of Web of Science, Embase, PubMed, and Scopus up to January 2021. Based on the inclusion and exclusion criteria of the present study, 278 articles were screened. Finally, 29 articles were included in this systematic review. RESULTS The obtained results showed that in experimental in vivo models, the radiation-treated groups had decreased survival rate and body weight compared to the control groups. It was also found that radiation can induce mild to severe toxicities on gastrointestinal, circulatory, reproductive, central nervous, respiratory, endocrine, exocrine systems, etc. However, the use of alpha-lipoic acid could alleviate the radiation-induced toxicities in most cases. This radio-protective agent exerts its effects through mechanisms of anti-oxidant, anti-apoptosis, anti-inflammatory, and so on. CONCLUSION According to the obtained results, it can be mentioned that co-treatment of alpha-lipoic acid with radiotherapy ameliorates the radiation-induced toxicities in healthy cells/tissues.
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Affiliation(s)
- Sahar Sheikholeslami
- Department of Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Shaghayegh Khodaverdian
- Department of Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Masoumeh Dorri-Giv
- Nuclear Medicine Research Center, Department of Nuclear Medicine, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Seyyed Mohammad Hosseini
- Department of Medical Physics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Shokoufeh Souri
- Department of Medical Physics, Semnan University of Medical Sciences, Semnan, Iran
| | | | - Hamed Zamani
- Department of Medical Physics, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Leila Dastranj
- Department of Physics, Hakim Sabzevari Universuty, Sabzevar, Iran.
| | - Bagher Farhood
- Department of Medical Physics and Radiology, Faculty of Paramedical Sciences, Kashan University of Medical Sciences, Kashan. Iran.
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12
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Bahmani T, Sharifzadeh S, Tamaddon G, Farzadfard E, Zare F, Fadaie M, Alizadeh M, Hadi M, Ranjbaran R, Mosleh-Shirazi MA, Behzad-Behbahani A. Mitochondrial Targeted Peptide (KLAKLAK) 2, and its Synergistic Radiotherapy Effects on Apoptosis of Radio Resistant Human Monocytic Leukemia Cell Line. J Biomed Phys Eng 2021; 11:229-238. [PMID: 33937129 PMCID: PMC8064137 DOI: 10.31661/jbpe.v0i0.905] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2018] [Accepted: 05/28/2018] [Indexed: 06/12/2023]
Abstract
BACKGROUND Ionizing radiation plays a significant role in cancer treatment. Despite recent advances in radiotherapy approaches, the existence of irradiation-resistant cancer cells is still a noteworthy challenge. Therefore, developing novel therapeutic approaches are still warranted in order to increase the sensitivity of tumor cells to radiation. Many types of research rely on the role of mitochondria in radiation protection. OBJECTIVE Here, we aimed to target the mitochondria of monocyticleukemia (THP-1) radio-resistant cell line cells by a mitochondrial disrupting peptide, D (KLAKLAK)2, and investigate the synergistic effect of Gamma-irradiation and KLA for tumor cells inhibition in vitro. MATERIAL AND METHODS In this experimental study, KLA was delivered into THP-1 cells using a Cell-Penetrating Peptide (CPP).The cells were then exposed to gamma-ray radiation both in the presence and absence of KLA conjugated with CPP. The impacts of KLA, ionizing radiation or combination of both were then evaluated on the cell proliferation and apoptosis of THP-1 cells using MTT assay and flow cytometry, respectively. RESULTS The MTT assay indicated the anti-proliferative effects of combined D (KLAKLAK)2 peptide with ionizing radiation on THP-1cells. Moreover, synergetic effects of KLA and ionizing radiation reduced cell viability and consequently enhanced cell apoptosis. CONCLUSION Using KLA peptide in combination with ionizing irradiation increases the anticancer effects of radio-resistant THP-1 cells. Therefore, the combinational therapy of (KLAKLAK)2 and radiation is a promising strategy for cancer treatment the in future.
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Affiliation(s)
- Taraneh Bahmani
- MSc, Division of Medical Biotechnology, Department of Laboratory Sciences, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
- MSc, Diagnostic Laboratory Sciences and Technology Research Center, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Sedigheh Sharifzadeh
- PhD, Diagnostic Laboratory Sciences and Technology Research Center, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Gholamhossein Tamaddon
- PhD, Diagnostic Laboratory Sciences and Technology Research Center, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
- PhD, Division of Medical Biotechnology, Department of Laboratory Sciences, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Ehsan Farzadfard
- MSc, Division of Medical Biotechnology, Department of Laboratory Sciences, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
- MSc, Diagnostic Laboratory Sciences and Technology Research Center, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Farahnaz Zare
- MSc, Division of Medical Biotechnology, Department of Laboratory Sciences, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Milad Fadaie
- MSc, Department of Medical Nanotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Marzieh Alizadeh
- MSc, Diagnostic Laboratory Sciences and Technology Research Center, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mahdieh Hadi
- PhD, Diagnostic Laboratory Sciences and Technology Research Center, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
- PhD, Division of Medical Biotechnology, Department of Laboratory Sciences, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Reza Ranjbaran
- PhD, Diagnostic Laboratory Sciences and Technology Research Center, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mohammad Amin Mosleh-Shirazi
- PhD, Ionizing and Nonionizing Radiation Protection Research Center, and Department of Radiotherapy and Oncology, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Abbas Behzad-Behbahani
- PhD, Diagnostic Laboratory Sciences and Technology Research Center, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
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13
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Abdullaev SA, Evdokimovskii EV, Gaziev AI. A Study of Mitochondrial DNA Copy Number and Heteroplasmy in Different Rat Brain Regions after Cranial Proton Impact. BIOL BULL+ 2021. [DOI: 10.1134/s1062359020110023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Suman S, Jaruga P, Dizdaroglu M, Fornace AJ, Datta K. Heavy ion space radiation triggers ongoing DNA base damage by downregulating DNA repair pathways. LIFE SCIENCES IN SPACE RESEARCH 2020; 27:27-32. [PMID: 34756227 DOI: 10.1016/j.lssr.2020.07.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 07/03/2020] [Accepted: 07/05/2020] [Indexed: 06/13/2023]
Abstract
Long-duration space missions outside low earth orbit will expose astronauts to a cumulative dose of high-energy particle radiation especially to highly damaging heavy ion radiation, which poses considerable risk to astronauts' health. The purpose of the current study was to quantitatively identify oxidatively induced DNA base modifications and assess status of the repair pathways involved in removing the modified bases in mouse intestinal cells after exposure to γ-rays and iron radiation. Mice (C57BL/6J; 6 to 8 weeks; female) were exposed to 0.5 Gy of either γ-rays or iron radiation and control mice were sham-irradiated. Intestinal tissues were collected 2 months after radiation. DNA base lesions were measured using gas chromatography-tandem mass spectrometry with isotope‑dilution. Base excision repair (BER) and nucleotide excision repair (NER) pathways were assessed using PCR and immunoblotting. Effects of iron radiation were compared to γ-rays and sham-irradiated controls. Exposure to iron radiation resulted in significantly higher levels of several DNA base lesions relative to control animals and those exposed to γ radiation. Assessment of BER and NER showed downregulation of pathway factors both at the RNA as well as at the protein levels. Our results not only provide important insight into DNA damage pattern in intestinal cells in response to iron radiation, but they also confirm our previous immunohistochemistry data on oxidatively induced DNA damage. We suggest that downregulation of the BER and NER pathways is contributing to ongoing DNA base damages long time after radiation exposure and has implications for chronic diseases including gastrointestinal diseases after heavy ion radiation exposure during space travel.
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Affiliation(s)
- Shubhankar Suman
- Department of Biochemistry and Molecular & Cellular Biology, Lombardi Comprehensive Cancer Center, Georgetown University, Research Building, Room E518, 3970 Reservoir Rd., NW, Washington, DC 20057, USA
| | - Pawel Jaruga
- Biomolecular Measurement Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Miral Dizdaroglu
- Biomolecular Measurement Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Albert J Fornace
- Department of Biochemistry and Molecular & Cellular Biology, Lombardi Comprehensive Cancer Center, Georgetown University, Research Building, Room E518, 3970 Reservoir Rd., NW, Washington, DC 20057, USA
| | - Kamal Datta
- Department of Biochemistry and Molecular & Cellular Biology, Lombardi Comprehensive Cancer Center, Georgetown University, Research Building, Room E518, 3970 Reservoir Rd., NW, Washington, DC 20057, USA.
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Jiang YW, Gao G, Jia HR, Zhang X, Cheng X, Wang HY, Liu P, Wu FG. Palladium Nanosheets as Safe Radiosensitizers for Radiotherapy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11637-11644. [PMID: 32902987 DOI: 10.1021/acs.langmuir.0c02316] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Many noble metal-based nanoparticles have emerged for applications in cancer radiotherapy in recent years, but few investigations have been carried out for palladium nanoparticles. Herein, palladium nanosheets (Pd NSs), which possess a sheetlike morphology with a diameter of ∼14 nm and a thickness of ∼2 nm, were utilized as a sensitizer to improve the performance of radiotherapy. It was found that Pd NSs alone did not decrease the cell viability after treatment for as long as 130 h, suggesting the excellent cytocompatibility of the nanoagents. However, the viability of cancer cells treated with X-ray irradiation became lower, and the viability became even lower if the cells were co-treated with X-ray and Pd NSs, indicating the radiosensitization effect of Pd NSs. Additionally, compared with X-ray irradiation, the combined treatment of Pd NSs and X-ray irradiation induced the generation of more DNA double-stranded breaks and reactive oxygen species within cancer cells, which eventually caused elevated cell apoptosis. Moreover, in vivo experiments also verified the radiosensitization effect and the favorable biocompatibility of Pd NSs, indicating their potential for acquiring satisfactory in vivo radiotherapeutic effect at lower X-ray doses. It is believed that the present research will open new avenues for the application of noble metal-based nanoparticles in radiosensitization.
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Affiliation(s)
- Yao-Wen Jiang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China
| | - Ge Gao
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China
| | - Hao-Ran Jia
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China
| | - Xiaodong Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China
| | - Xiaotong Cheng
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China
| | - Hong-Yin Wang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China
| | - Peidang Liu
- Institute of Neurobiology, School of Medicine, Southeast University, Nanjing 210096, P. R. China
| | - Fu-Gen Wu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, P. R. China
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Yahyapour R, Amini P, Saffar H, Motevaseli E, Farhood B, Pooladvand V, Shabeeb D, Musa AE, Najafi M. Protective Effect of Metformin, Resveratrol and Alpha-lipoic Acid on Radiation- Induced Pneumonitis and Fibrosis: A Histopathological Study. Curr Drug Res Rev 2020; 11:111-117. [PMID: 31875783 DOI: 10.2174/2589977511666191018180758] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Revised: 08/22/2019] [Accepted: 09/11/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND Radiation-induced pneumonitis and fibrosis are the most common side effects of chest radiotherapy. They result from massive and chronic production of Reactive Oxygen Species (ROS), inhibition of antioxidant enzymes as well as the release of several inflammatory mediators. In this study, we aimed to detect the radioprotective effects of metformin (as inhibitor of mitochondrial ROS), resveratrol (as stimulator of antioxidant defense enzymes) and alpha-lipoic acid (as direct antioxidant) for alleviating radiation-induced pneumonitis and fibrosis. METHODS 80 Male Mice were randomly allotted to eight groups which include G1: control; G2: resveratrol; G3: alpha-lipoic acid; G4: metformin; G5: radiation; G6: radiation plus resveratrol; G7: radiation plus alpha-lipoic acid; G8: radiation plus metformin. Drugs' doses were as follows: 100 mg/kg metformin, 200 mg/kg resveratrol and 200 mg/kg alpha-lipoic acid. Irradiation with a single radiation dose of 18 Gy was performed using a cobalt-60 (60Co) gamma-ray source. After 80 days, all mice were sacrificed and their lung tissues evaluated for morphological changes using histopathological markers. RESULTS Irradiation led to acute pneumonitis including infiltration of inflammatory cells and damages to alveolar and vascular, as well as mild fibrosis. Metformin, alpha-lipoic acid and resveratrol were able to reduce pneumonitis and overcome radiation-induced fibrosis. CONCLUSION All agents could protect against radiation-induced lung injury moderately. It is possible that administering higher doses of these drugs over a long period of time could give better radioprotection of the lung.
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Affiliation(s)
- Rasoul Yahyapour
- School of Medicine, Jiroft University of Medical Sciences, Jiroft, Iran
| | - Peyman Amini
- Department of Radiology, Faculty of Paramedical, Tehran University of Medical Sciences, Tehran, Iran
| | - Hana Saffar
- Clinical and Anatomical Pathologist at Tehran University of Medical Science, Imam Khomeini Hospital Complex, Tehran, Iran
| | - Elahe Motevaseli
- Department of Molecular Medicine, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Bagher Farhood
- Departments of Medical Physics and Radiology, Faculty of Paramedical Sciences, Kashan University of Medical Sciences, Kashan, Iran
| | - Vahid Pooladvand
- Department of Sciences, Faculty of Medicine, Jiroft University of Medical Sciences, Jiroft, Iran
| | - Dheyauldeen Shabeeb
- Department of Physiology, College of Medicine, University of Misan, Misan, Iraq
| | - Ahmed Eleojo Musa
- Department of Medical Physics, Tehran University of Medical Sciences, Tehran, Iran.,Department of Physics, Federal University of Technology, Minna, Nigeria
| | - Masoud Najafi
- Radiology and Nuclear Medicine Department, School of Paramedical Sciences, Kermanshah University of Medical Sciences, Kermanshah, Iran
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17
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Increase of mtDNA number and its mutant copies in rat brain after exposure to 150 MeV protons. Mol Biol Rep 2020; 47:4815-4820. [PMID: 32388700 DOI: 10.1007/s11033-020-05491-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 04/30/2020] [Indexed: 12/31/2022]
Abstract
Proton beam therapy is widely used for treating brain tumor. Despite the efficacy of treatment, the use of this therapy has met some limitations associated with possible damage to normal brain tissues located beyond the tumor site. In this context, the exploration of the harmful effects of protons on the normal brain tissues is of particular interest. We have investigated changes in the total mitochondrial DNA (mtDNA) copy number and identified mtDNA mutant copies in three brain regions (the hippocampus, cortex and cerebellum) of rats after irradiation their whole-head with 150 MeV protons at doses of 3 and 5 Gy. The study was performed in 2-months old male Spraque Dawley rats (n = 5 each group). The mtDNA copy numbers were determined by real-time PCR. The level of mtDNA heteroplasmy was estimated using Surveyor nuclease technology. Our results show that after head exposure to protons, levels of mtDNA copy number in three rat brain regions increase significantly as the levels of mtDNA mutant copies increase. The most significant elevation is observed in the hippocampus. In conclusion, an increase in mtDNA mutant copies may contribute to mitochondrial dysfunction accompanied by increased oxidative stress in different brain regions and promote the development of neurodegenerative diseases and the induction of carcinogenesis.
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18
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Helm JS, Rudel RA. Adverse outcome pathways for ionizing radiation and breast cancer involve direct and indirect DNA damage, oxidative stress, inflammation, genomic instability, and interaction with hormonal regulation of the breast. Arch Toxicol 2020. [PMID: 32399610 DOI: 10.1007/s00204-020-02752-z)] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Abstract
Knowledge about established breast carcinogens can support improved and modernized toxicological testing methods by identifying key mechanistic events. Ionizing radiation (IR) increases the risk of breast cancer, especially for women and for exposure at younger ages, and evidence overall supports a linear dose-response relationship. We used the Adverse Outcome Pathway (AOP) framework to outline and evaluate the evidence linking ionizing radiation with breast cancer from molecular initiating events to the adverse outcome through intermediate key events, creating a qualitative AOP. We identified key events based on review articles, searched PubMed for recent literature on key events and IR, and identified additional papers using references. We manually curated publications and evaluated data quality. Ionizing radiation directly and indirectly causes DNA damage and increases production of reactive oxygen and nitrogen species (RONS). RONS lead to DNA damage and epigenetic changes leading to mutations and genomic instability (GI). Proliferation amplifies the effects of DNA damage and mutations leading to the AO of breast cancer. Separately, RONS and DNA damage also increase inflammation. Inflammation contributes to direct and indirect effects (effects in cells not directly reached by IR) via positive feedback to RONS and DNA damage, and separately increases proliferation and breast cancer through pro-carcinogenic effects on cells and tissue. For example, gene expression changes alter inflammatory mediators, resulting in improved survival and growth of cancer cells and a more hospitable tissue environment. All of these events overlap at multiple points with events characteristic of "background" induction of breast carcinogenesis, including hormone-responsive proliferation, oxidative activity, and DNA damage. These overlaps make the breast particularly susceptible to ionizing radiation and reinforce that these biological activities are important characteristics of carcinogens. Agents that increase these biological processes should be considered potential breast carcinogens, and predictive methods are needed to identify chemicals that increase these processes. Techniques are available to measure RONS, DNA damage and mutation, cell proliferation, and some inflammatory proteins or processes. Improved assays are needed to measure GI and chronic inflammation, as well as the interaction with hormonally driven development and proliferation. Several methods measure diverse epigenetic changes, but it is not clear which changes are relevant to breast cancer. In addition, most toxicological assays are not conducted in mammary tissue, and so it is a priority to evaluate if results from other tissues are generalizable to breast, or to conduct assays in breast tissue. Developing and applying these assays to identify exposures of concern will facilitate efforts to reduce subsequent breast cancer risk.
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Affiliation(s)
- Jessica S Helm
- Silent Spring Institute, 320 Nevada Street, Suite 302, Newton, MA, 02460, USA
| | - Ruthann A Rudel
- Silent Spring Institute, 320 Nevada Street, Suite 302, Newton, MA, 02460, USA.
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19
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Helm JS, Rudel RA. Adverse outcome pathways for ionizing radiation and breast cancer involve direct and indirect DNA damage, oxidative stress, inflammation, genomic instability, and interaction with hormonal regulation of the breast. Arch Toxicol 2020; 94:1511-1549. [PMID: 32399610 PMCID: PMC7261741 DOI: 10.1007/s00204-020-02752-z] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 04/16/2020] [Indexed: 12/15/2022]
Abstract
Knowledge about established breast carcinogens can support improved and modernized toxicological testing methods by identifying key mechanistic events. Ionizing radiation (IR) increases the risk of breast cancer, especially for women and for exposure at younger ages, and evidence overall supports a linear dose-response relationship. We used the Adverse Outcome Pathway (AOP) framework to outline and evaluate the evidence linking ionizing radiation with breast cancer from molecular initiating events to the adverse outcome through intermediate key events, creating a qualitative AOP. We identified key events based on review articles, searched PubMed for recent literature on key events and IR, and identified additional papers using references. We manually curated publications and evaluated data quality. Ionizing radiation directly and indirectly causes DNA damage and increases production of reactive oxygen and nitrogen species (RONS). RONS lead to DNA damage and epigenetic changes leading to mutations and genomic instability (GI). Proliferation amplifies the effects of DNA damage and mutations leading to the AO of breast cancer. Separately, RONS and DNA damage also increase inflammation. Inflammation contributes to direct and indirect effects (effects in cells not directly reached by IR) via positive feedback to RONS and DNA damage, and separately increases proliferation and breast cancer through pro-carcinogenic effects on cells and tissue. For example, gene expression changes alter inflammatory mediators, resulting in improved survival and growth of cancer cells and a more hospitable tissue environment. All of these events overlap at multiple points with events characteristic of "background" induction of breast carcinogenesis, including hormone-responsive proliferation, oxidative activity, and DNA damage. These overlaps make the breast particularly susceptible to ionizing radiation and reinforce that these biological activities are important characteristics of carcinogens. Agents that increase these biological processes should be considered potential breast carcinogens, and predictive methods are needed to identify chemicals that increase these processes. Techniques are available to measure RONS, DNA damage and mutation, cell proliferation, and some inflammatory proteins or processes. Improved assays are needed to measure GI and chronic inflammation, as well as the interaction with hormonally driven development and proliferation. Several methods measure diverse epigenetic changes, but it is not clear which changes are relevant to breast cancer. In addition, most toxicological assays are not conducted in mammary tissue, and so it is a priority to evaluate if results from other tissues are generalizable to breast, or to conduct assays in breast tissue. Developing and applying these assays to identify exposures of concern will facilitate efforts to reduce subsequent breast cancer risk.
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Affiliation(s)
- Jessica S Helm
- Silent Spring Institute, 320 Nevada Street, Suite 302, Newton, MA, 02460, USA
| | - Ruthann A Rudel
- Silent Spring Institute, 320 Nevada Street, Suite 302, Newton, MA, 02460, USA.
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20
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High expression of oxidative phosphorylation genes predicts improved survival in squamous cell carcinomas of the head and neck and lung. Sci Rep 2020; 10:6380. [PMID: 32286489 PMCID: PMC7156383 DOI: 10.1038/s41598-020-63448-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Accepted: 03/31/2020] [Indexed: 01/03/2023] Open
Abstract
Mitochondrial activity is a critical component of tumor metabolism, with profound implications for tumorigenesis and treatment response. We analyzed clinical, genomic and expression data from patients with oral cavity squamous cell carcinoma (OCSCC) in order to map metabologenomic events which may correlate with clinical outcomes and identified nuclear genes involved in oxidative phosphorylation and glycolysis (OXPHOG) as a critical predictor of patient survival. This correlation was validated in a secondary unrelated set of lung squamous cell carcinoma (LUSC) and was shown to be driven largely by over-expression of nuclear encoded components of the mitochondrial electron transport chain (ETC) coordinated with an increase in tumor mitochondrial DNA copy number and a strong threshold effect on patient survival. OCSCC and LUSC patients with a favorable OXPHOG signature demonstrated a dramatic (>2fold) improvement in survival compared to their counterparts. Differential OXPHOG expression correlated with varying tumor immune infiltrates suggesting that the interaction between tumor metabolic activity and tumor associated immunocytes may be a critical driver of improved clinical outcomes in this patient subset. These data provide strong support for studies aimed at mechanistically characterizing the interaction between tumor mitochondrial activity and the tumor immune microenvironment.
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Abdullaev S, Gubina N, Bulanova T, Gaziev A. Assessment of Nuclear and Mitochondrial DNA, Expression of Mitochondria-Related Genes in Different Brain Regions in Rats after Whole-Body X-ray Irradiation. Int J Mol Sci 2020; 21:ijms21041196. [PMID: 32054039 PMCID: PMC7072726 DOI: 10.3390/ijms21041196] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Revised: 02/07/2020] [Accepted: 02/08/2020] [Indexed: 01/02/2023] Open
Abstract
Studies of molecular changes occurred in various brain regions after whole-body irradiation showed a significant increase in terms of the importance in gaining insight into how to slow down or prevent the development of long-term side effects such as carcinogenesis, cognitive impairment and other pathologies. We have analyzed nDNA damage and repair, changes in mitochondrial DNA (mtDNA) copy number and in the level of mtDNA heteroplasmy, and also examined changes in the expression of genes involved in the regulation of mitochondrial biogenesis and dynamics in three areas of the rat brain (hippocampus, cortex and cerebellum) after whole-body X-ray irradiation. Long amplicon quantitative polymerase chain reaction (LA-QPCR) was used to detect nDNA and mtDNA damage. The level of mtDNA heteroplasmy was estimated using Surveyor nuclease technology. The mtDNA copy numbers and expression levels of a number of genes were determined by real-time PCR. The results showed that the repair of nDNA damage in the rat brain regions occurs slowly within 24 h; in the hippocampus, this process runs much slower. The number of mtDNA copies in three regions of the rat brain increases with a simultaneous increase in mtDNA heteroplasmy. However, in the hippocampus, the copy number of mutant mtDNAs increases significantly by the time point of 24 h after radiation exposure. Our analysis shows that in the brain regions of irradiated rats, there is a decrease in the expression of genes (ND2, CytB, ATP5O) involved in ATP synthesis, although by the same time point after irradiation, an increase in transcripts of genes regulating mitochondrial biogenesis is observed. On the other hand, analysis of genes that control the dynamics of mitochondria (Mfn1, Fis1) revealed that sharp decrease in gene expression level occurred, only in the hippocampus. Consequently, the structural and functional characteristics of the hippocampus of rats exposed to whole-body radiation can be different, most significantly from those of the other brain regions.
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Affiliation(s)
- Serazhutdin Abdullaev
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, 142290 Moscow, Russia; (N.G.); (A.G.)
- Correspondence: ; Tel.: +7-(4967)-739364; Fax: +7-(4967)-330553
| | - Nina Gubina
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, 142290 Moscow, Russia; (N.G.); (A.G.)
| | - Tatiana Bulanova
- Joint Institute for Nuclear Research, Dubna, 141980 Moscow, Russia;
| | - Azhub Gaziev
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, 142290 Moscow, Russia; (N.G.); (A.G.)
- Joint Institute for Nuclear Research, Dubna, 141980 Moscow, Russia;
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Roy SJ, Koval OM, Sebag SC, Ait-Aissa K, Allen BG, Spitz DR, Grumbach IM. Inhibition of CaMKII in mitochondria preserves endothelial barrier function after irradiation. Free Radic Biol Med 2020; 146:287-298. [PMID: 31711984 PMCID: PMC7274136 DOI: 10.1016/j.freeradbiomed.2019.11.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 11/04/2019] [Accepted: 11/07/2019] [Indexed: 01/03/2023]
Abstract
Damage to the microvascular endothelium is an important part of normal tissue injury after radiation exposure and driven by the production of pro-oxidants. The Ca2+/calmodulin-dependent protein kinase II is present in the mitochondrial matrix (mitoCaMKII) where it regulates Ca2+ uptake via the mitochondrial Ca2+ uniporter (MCU) and pro-oxidant production. Here, we demonstrate that radiation exposure disrupts endothelial cell barrier integrity in vitro, but can be abrogated by inhibition of mitoCaMKII, MCU, or opening of the mitochondrial transition pore. Scavenging of mitochondrial pro-oxidants with mitoTEMPO before, but not after irradiation, protected barrier function. Furthermore, markers of apoptosis and mitochondrial pro-oxidant production were elevated at 24 h following irradiation and abolished by mitoCaMKII inhibition. Endothelial barrier dysfunction was detected as early as 2 h after irradiation. Despite only mildly impaired mitochondrial respiration, the intracellular ATP levels were significantly reduced 4 h after irradiation and correlated with barrier function. MitoCaMKII inhibition improved intracellular ATP concentrations by increasing glycolysis. Finally, DNA double strand break repair and non-homologous end joining, two major drivers of ATP consumption after irradiation, were greatly increased but not significantly affected by mitoCaMKII inhibition. These findings support the hypothesis that mitoCaMKII activity is linked to mitochondrial pro-oxidant production, reduced ATP production, and loss of endothelial barrier function following irradiation. The inhibition of mitoCaMKII is a promising approach to limiting radiation-induced endothelial injury.
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Affiliation(s)
- Stephen J Roy
- Abboud Cardiovascular Research Center, Division of Cardiovascular Medicine, Department of Internal Medicine, 169 Newton Rd, 4336 PBDB, University of Iowa, Iowa City, IA, 52242, USA
| | - Olha M Koval
- Abboud Cardiovascular Research Center, Division of Cardiovascular Medicine, Department of Internal Medicine, 169 Newton Rd, 4336 PBDB, University of Iowa, Iowa City, IA, 52242, USA
| | - Sara C Sebag
- Abboud Cardiovascular Research Center, Division of Cardiovascular Medicine, Department of Internal Medicine, 169 Newton Rd, 4336 PBDB, University of Iowa, Iowa City, IA, 52242, USA
| | - Karima Ait-Aissa
- Abboud Cardiovascular Research Center, Division of Cardiovascular Medicine, Department of Internal Medicine, 169 Newton Rd, 4336 PBDB, University of Iowa, Iowa City, IA, 52242, USA
| | - Bryan G Allen
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, Holden Comprehensive Cancer Center, B180 Medical Laboratories, University of Iowa, Iowa City, IA, 52242, USA
| | - Douglas R Spitz
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, Holden Comprehensive Cancer Center, B180 Medical Laboratories, University of Iowa, Iowa City, IA, 52242, USA
| | - Isabella M Grumbach
- Abboud Cardiovascular Research Center, Division of Cardiovascular Medicine, Department of Internal Medicine, 169 Newton Rd, 4336 PBDB, University of Iowa, Iowa City, IA, 52242, USA; Free Radical and Radiation Biology Program, Department of Radiation Oncology, Holden Comprehensive Cancer Center, B180 Medical Laboratories, University of Iowa, Iowa City, IA, 52242, USA; Veterans Affairs Health Care System, 601 Hwy 6 West Iowa City, IA, 52246, USA.
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Beach TA, Groves AM, Williams JP, Finkelstein JN. Modeling radiation-induced lung injury: lessons learned from whole thorax irradiation. Int J Radiat Biol 2020; 96:129-144. [PMID: 30359147 PMCID: PMC6483900 DOI: 10.1080/09553002.2018.1532619] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 09/12/2018] [Accepted: 09/13/2018] [Indexed: 12/25/2022]
Abstract
Models of thoracic irradiation have been developed as clinicians and scientists have attempted to decipher the events that led up to the pulmonary toxicity seen in human subjects following radiation treatment. The most common model is that of whole thorax irradiation (WTI), applied in a single dose. Mice, particularly the C57BL/6J strain, has been frequently used in these investigations, and has greatly informed our current understanding of the initiation and progression of radiation-induced lung injury (RILI). In this review, we highlight the sequential progression and dynamic nature of RILI, focusing primarily on the vast array of information that has been gleaned from the murine model. Ample evidence indicates a wide array of biological responses that can be seen following irradiation, including DNA damage, oxidative stress, cellular senescence and inflammation, all triggered by the initial exposure to ionizing radiation (IR) and heterogeneously maintained throughout the temporal progression of injury, which manifests as acute pneumonitis and later fibrosis. It appears that the early responses of specific cell types may promote further injury, disrupting the microenvironment and preventing a return to homeostasis, although the exact mechanisms driving these responses remains somewhat unclear. Attempts to either prevent or treat RILI in preclinical models have shown some success by targeting these disparate radiobiological processes. As our understanding of the dynamic cellular responses to radiation improves through the use of such models, so does the likelihood of preventing or treating RILI.
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Affiliation(s)
- Tyler A. Beach
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY 14642
- These authors contributed equally to this publication
| | - Angela M. Groves
- Department of Pediatrics and Neonatology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642
- These authors contributed equally to this publication
| | - Jacqueline P. Williams
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY 14642
- Department of Radiation Oncology, University of Rochester Medical Center, Rochester, NY 14642
| | - Jacob N. Finkelstein
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY 14642
- Department of Pediatrics and Neonatology, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642
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24
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Brooks AL. The impact of dose rate on the linear no threshold hypothesis. Chem Biol Interact 2019; 301:68-80. [PMID: 30763551 DOI: 10.1016/j.cbi.2018.12.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 11/17/2018] [Accepted: 12/11/2018] [Indexed: 12/13/2022]
Abstract
The goal of this manuscript is to define the role of dose rate and dose protraction on the induction of biological changes at all levels of biological organization. Both total dose and the time frame over which it is delivered are important as the body has great capacity to repair all types of biological damage. The importance of dose rate has been recognized almost from the time that radiation was discovered and has been included in radiation standards as a Dose, Dose Rate, Effectiveness Factor (DDREF) and a Dose Rate Effectiveness Factor (DREF). This manuscript will evaluate the role of dose rate at the molecular, cellular, tissue, experimental animals and humans to demonstrate that dose rate is an important variable in estimating radiation cancer risk and other biological effects. The impact of low-dose rates on the Linear-No-Threshold Hypothesis (LNTH) will be reviewed since if the LNTH is not valid it is not possible to calculate a single value for a DDREF or DREF. Finally, extensive human experience is briefly reviewed to show that the radiation risks are not underestimated and that radiation at environmental levels has limited impact on total human cancer risk.
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Affiliation(s)
- Antone L Brooks
- Environmental Science, Washington State University, Richland, WA, USA.
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25
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Ma N, Kato T, Isogai T, Gu Y, Yamashita T. The Potential Effects of Taurine in Mitigation of Radiation Nephropathy. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1155:497-505. [PMID: 31468426 DOI: 10.1007/978-981-13-8023-5_46] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Taurine (2-aminoethanesulfonic acid) is a sulfur-containing organic acid possessing several important effects, including antioxidant and anti-inflammatory ones. Exposure to ionizing radiation generates free radicals and reactive oxygen species (ROS) in irradiated cells, and free radical generation leads to oxidative stress. It is known that radiation nephropathy includes an inflammation-based process in which ROS and cytokines are responsible. Different doses of explored radiation can cause apoptosis, inflammation and a profound oxidative stress in kidneys. Oxidative stress is involved in renal injury after exposure to both ionizing radiation and inflammation. In this review, we describe the protective effect of taurine against several kidney diseases and the potential effects of taurine in the mitigation of radiation nephropathy. We also report that X-irradiation decreased the expression of taurine and TauT in the kidney. Taurine administration suppressed the decrease in the expression of taurine and TauT in the kidney after radiation exposure. Taurine might contribute to the mitigation of kidney injury induced by radiation.
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Affiliation(s)
- Ning Ma
- Division of Health Science, Graduate School of Health Science, Suzuka University, Suzuka, Mie, Japan
| | - Toshihiro Kato
- Department of Rehabilitation, Suzuka Kaisei Hospital, Suzuka, Japan
| | - Tamami Isogai
- Faculty of Health Science, Suzuka University of Medical Science, Suzuka, Japan
| | - Yeunhwa Gu
- Faculty of Health Science, Junshin Gakuen University, Fukuoka, Japan
| | - Takenori Yamashita
- Faculty of Health Science, Suzuka University of Medical Science, Suzuka, Japan. .,Division of Health Science, Graduate School of Health Science, Suzuka University of Medical Science, Suzuka, Mie, Japan.
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Baulch JE. Radiation-induced genomic instability, epigenetic mechanisms and the mitochondria: a dysfunctional ménage a trois? Int J Radiat Biol 2018; 95:516-525. [DOI: 10.1080/09553002.2018.1549757] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Janet E. Baulch
- Department of Radiation Oncology, University of California Irvine, Irvine, CA, USA
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27
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Suman S, Kumar S, Fornace AJ, Datta K. The effect of carbon irradiation is associated with greater oxidative stress in mouse intestine and colon relative to γ-rays. Free Radic Res 2018; 52:556-567. [PMID: 29544379 DOI: 10.1080/10715762.2018.1452204] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Carbon irradiation due to its higher biological effectiveness relative to photon radiation is a concern for toxicity to proliferative normal gastrointestinal (GI) tissue after radiotherapy and long-duration space missions such as mission to Mars. Although radiation-induced oxidative stress is linked to chronic diseases such as cancer, effects of carbon irradiation on normal GI tissue have not been fully understood. This study assessed and compared chronic oxidative stress in mouse intestine and colon after different doses of carbon and γ radiation, which are qualitatively different. Mice (C57BL/6J) were exposed to 0.5 or 1.3 Gy of γ or carbon irradiation, and intestinal and colonic tissues were collected 2 months after irradiation. While part of the tissues was used for isolating epithelial cells, tissue samples were also fixed and paraffin embedded for 4 µm thick sections as well as frozen for biochemical assays. In isolated epithelial cells, reactive oxygen species and mitochondrial status were studied using fluorescent probes and flow cytometry. We assessed antioxidant enzymes and nicotinamide adenine dinucleotide phosphate (NADPH) oxidase activity in tissues and formalin-fixed tissue sections were stained for 4-hydroxynonenal, a lipid peroxidation marker. Data show that mitochondrial deregulation, increased NADPH oxidase activity, and decreased antioxidant activity were major contributors to carbon radiation-induced oxidative stress in mouse intestinal and colonic cells. When considered along with higher lipid peroxidation after carbon irradiation relative to γ-rays, our data have implications for functional changes in intestine and carcinogenesis in colon after carbon radiotherapy as well as space travel.
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Affiliation(s)
- Shubhankar Suman
- a Department of Biochemistry and Molecular & Cellular Biology and Lombardi Comprehensive Cancer Center , Georgetown University , Washington , DC , USA
| | - Santosh Kumar
- a Department of Biochemistry and Molecular & Cellular Biology and Lombardi Comprehensive Cancer Center , Georgetown University , Washington , DC , USA
| | - Albert J Fornace
- a Department of Biochemistry and Molecular & Cellular Biology and Lombardi Comprehensive Cancer Center , Georgetown University , Washington , DC , USA
| | - Kamal Datta
- a Department of Biochemistry and Molecular & Cellular Biology and Lombardi Comprehensive Cancer Center , Georgetown University , Washington , DC , USA
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28
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Li S, Zhao M, Jiang T, Lv W, Gao S, Zhou Y, Miao Z. Growth performance and antioxidant status of growing rabbits fed on diets supplemented with Eucommia ulmoides leaves. WORLD RABBIT SCIENCE 2018. [DOI: 10.4995/wrs.2018.7864] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
<p>The present study evaluated the effect of dietary <em>Eucommia ulmoides leaves</em> (EUL) on growth performance and antioxidant status of growing rabbits under heat stress condition. Four hundred and fifty weaned New Zealand male rabbits (6 wk old) were randomly divided into 3 equal groups (150 rabbits/group) and fed with a basal diet (control, digestible energy (DE): 15.92 MJ/kg and crude protein (CP): 19.24%) or the basal diet supplemented with 1 or 5 g of EUL/kg of diet (EUL1 and EUL5), in which the same quantity of barley meal was replaced. During the 21 d of experiment (43 to 63 d of age), the temperature and relative humidity of the rabbit house ranged from 27.5 to 32.5°C and from 65 to 73%, respectively. We analysed feed intake, growth performance and antioxidant status of growing rabbits. Compared with the control group, at the end of the experimental period, EUL supplementation significantly reduced the average daily feed intake (92.0, 92.8 and 100.7 g/d for EUL1, EUL5 and control, respectively; P<0.05), improved the feed conversion ratio (3.80, 3.81 and 4.59 for EUL1, EUL5 and control, respectively; P<0.05), increased the activities of glutathione peroxidase (+35.5 and +35.0% in plasma and liver of rabbits in EUL5 vs. control group, respectively; P<0.05) and reduced those of malondialdehyde (–12.0 and –46.0% in plasma and liver of rabbits in EUL5 vs. control group, respectively; P<0.05). These results suggest that inclusion of EUL in the diet of growing rabbits improved the growth performance and antioxidant status in growing rabbits.</p>
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29
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Cao Q, Liu W, Wang J, Cao J, Yang H. A single low dose of Fe ions can cause long-term biological responses in NL20 human bronchial epithelial cells. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2018; 57:31-40. [PMID: 29127482 DOI: 10.1007/s00411-017-0719-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 10/20/2017] [Indexed: 06/07/2023]
Abstract
Space radiation cancer risk may be a potential obstacle for long-duration spaceflight. Among all types of cancer space radiation may induce, lung cancer has been estimated to be the largest potential risk. Although previous animal study has shown that Fe ions, the most important contributor to the total dose equivalent of space radiation, induced a higher incidence of lung tumorigenesis per dose than X-rays, the underlying mechanisms at cellular level remained unclear. Therefore, in the present study, we investigated long-term biological changes in NL20 human bronchial epithelial cells after exposure to Fe ion or X-ray irradiation. We found that compared with sham control, the progeny of NL20 cells irradiated with 0.1 Gy of Fe ions showed slightly increased micronucleus formation, significantly decreased cell proliferation, disturbed cell cycle distribution, and obviously elevated intracellular ROS levels accompanied by reduced SOD1 and SOD2 expression, but the progeny of NL20 cells irradiated with 0.9 Gy of X-rays did not show any significant changes. More importantly, Fe ion exposure caused much greater soft-agar colony formation than X-rays did in the progeny of irradiated NL20 cells, clearly suggesting higher cell transformation potential of Fe ions compared with X-rays. These data may shed the light on the potential lung tumorigenesis risk from Fe ion exposure. In addition, ATM inhibition by Ku55933 reversed some of the changes in the progeny of Fe ion-irradiated cells but not others such as soft-agar colony formation, suggesting complex processes from DNA damage to carcinogenesis. These data indicate that even a single low dose of Fe ions can induce long-term biological responses such as cell transformation, etc., suggesting unignorable health risk from space radiation to astronauts.
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Affiliation(s)
- Qianlin Cao
- School of Radiation Medicine and Protection, Medical College of Soochow University/Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, 199 Renai Road, Suzhou Industrial Park, Suzhou, 215123, Jiangsu, People's Republic of China
| | - Wei Liu
- Department of Radiotherapy and Oncology, Second Affiliated Hospital, Soochow University, 1055 Sanxiang Road, Suzhou, 215004, Jiangsu, People's Republic of China
| | - Jingdong Wang
- School of Radiation Medicine and Protection, Medical College of Soochow University/Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, 199 Renai Road, Suzhou Industrial Park, Suzhou, 215123, Jiangsu, People's Republic of China
| | - Jianping Cao
- School of Radiation Medicine and Protection, Medical College of Soochow University/Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, 199 Renai Road, Suzhou Industrial Park, Suzhou, 215123, Jiangsu, People's Republic of China
| | - Hongying Yang
- School of Radiation Medicine and Protection, Medical College of Soochow University/Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, 199 Renai Road, Suzhou Industrial Park, Suzhou, 215123, Jiangsu, People's Republic of China.
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30
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Yahyapour R, Motevaseli E, Rezaeyan A, Abdollahi H, Farhood B, Cheki M, Rezapoor S, Shabeeb D, Musa AE, Najafi M, Villa V. Reduction–oxidation (redox) system in radiation-induced normal tissue injury: molecular mechanisms and implications in radiation therapeutics. Clin Transl Oncol 2018; 20:975-988. [DOI: 10.1007/s12094-017-1828-6] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Accepted: 12/27/2017] [Indexed: 02/07/2023]
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Protective effect of mitochondrial-targeted antioxidant MitoQ against iron ion 56Fe radiation induced brain injury in mice. Toxicol Appl Pharmacol 2018; 341:1-7. [PMID: 29317239 DOI: 10.1016/j.taap.2018.01.003] [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: 10/04/2017] [Revised: 01/04/2018] [Accepted: 01/05/2018] [Indexed: 11/23/2022]
Abstract
Exposure to iron ion 56Fe radiation (IR) during space missions poses a significant risk to the central nervous system and radiation exposure is intimately linked to the production of reactive oxygen species (ROS). MitoQ is a mitochondria-targeted antioxidant that has been shown to decrease oxidative damage and lower mitochondrial ROS in a number of animal models. Therefore, the present study aimed to investigate role of the mitochondrial targeted antioxidant MitoQ against 56Fe particle irradiation-induced oxidative damage and mitochondria dysfunction in the mouse brains. Increased ROS levels were observed in mouse brains after IR compared with the control group. Enhanced ROS production leads to disruption of cellular antioxidant defense systems, mitochondrial respiration dysfunction, altered mitochondria dynamics and increased release of cytochrome c (cyto c) from mitochondria into cytosol resulting in apoptotic cell death. MitoQ reduced IR-induced oxidative stress (decreased ROS production and increased SOD, CAT activities) with decreased lipid peroxidation as well as reduced protein and DNA oxidation. MitoQ also protected mitochondrial respiration after IR. In addition, MitoQ increased the expression of mitofusin2 (Mfn2) and optic atrophy gene1 (OPA1), and decreased the expression of dynamic-like protein (Drp1). MitoQ also suppressed mitochondrial DNA damage, cyto c release, and caspase-3 activity in IR-treated mice compared to the control group. These results demonstrate that MitoQ may protect against IR-induced brain injury.
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Shimura T, Sasatani M, Kawai H, Kamiya K, Kobayashi J, Komatsu K, Kunugita N. ATM-mediated mitochondrial damage response triggered by nuclear DNA damage in normal human lung fibroblasts. Cell Cycle 2017; 16:2345-2354. [PMID: 29099268 DOI: 10.1080/15384101.2017.1387697] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Ionizing radiation (IR) elevates mitochondrial oxidative phosphorylation (OXPHOS) in response to the energy requirement for DNA damage responses. Reactive oxygen species (ROS) released during mitochondrial OXPHOS may cause oxidative damage to mitochondria in irradiated cells. In this paper, we investigated the association between nuclear DNA damage and mitochondrial damage following IR in normal human lung fibroblasts. In contrast to low-doses of acute single radiation, continuous exposure of chronic radiation or long-term exposure of fractionated radiation (FR) induced persistent Rad51 and γ-H2AX foci at least 24 hours after IR in irradiated cells. Additionally, long-term FR increased mitochondrial ROS accompanied with enhanced mitochondrial membrane potential (ΔΨm) and mitochondrial complex IV (cytochrome c oxidase) activity. Mitochondrial ROS released from the respiratory chain complex I caused oxidative damage to mitochondria. Inhibition of ATM kinase or ATM loss eliminated nuclear DNA damage recognition and mitochondrial radiation responses. Consequently, nuclear DNA damage activates ATM which in turn increases ROS level and subsequently induces mitochondrial damage in irradiated cells. In conclusion, we demonstrated that ATM is essential in the mitochondrial radiation responses in irradiated cells. We further demonstrated that ATM is involved in signal transduction from nucleus to the mitochondria in response to IR.
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Affiliation(s)
- Tsutomu Shimura
- a Department of Environmental Health ; National Institute of Public Health 2-3-6 Minami ; Wako , Saitama , Japan
| | - Megumi Sasatani
- b Department of Experimental Oncology ; Research Center for Radiation Genome Medicine ; Research Institute for Radiation Biology and Medicine (RIRBM) ; Hiroshima University , Hiroshima , Japan
| | - Hidehiko Kawai
- b Department of Experimental Oncology ; Research Center for Radiation Genome Medicine ; Research Institute for Radiation Biology and Medicine (RIRBM) ; Hiroshima University , Hiroshima , Japan
| | - Kenji Kamiya
- b Department of Experimental Oncology ; Research Center for Radiation Genome Medicine ; Research Institute for Radiation Biology and Medicine (RIRBM) ; Hiroshima University , Hiroshima , Japan
| | - Junya Kobayashi
- c Department of Genome Dynamics , Radiation Biology Center ; Kyoto University ; Kyoto , Japan
| | - Kenshi Komatsu
- c Department of Genome Dynamics , Radiation Biology Center ; Kyoto University ; Kyoto , Japan
| | - Naoki Kunugita
- a Department of Environmental Health ; National Institute of Public Health 2-3-6 Minami ; Wako , Saitama , Japan
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33
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Paths from DNA damage and signaling to genome rearrangements via homologous recombination. Mutat Res 2017; 806:64-74. [PMID: 28779875 DOI: 10.1016/j.mrfmmm.2017.07.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Accepted: 07/21/2017] [Indexed: 12/31/2022]
Abstract
DNA damage is a constant threat to genome integrity. DNA repair and damage signaling networks play a central role maintaining genome stability, suppressing tumorigenesis, and determining tumor response to common cancer chemotherapeutic agents and radiotherapy. DNA double-strand breaks (DSBs) are critical lesions induced by ionizing radiation and when replication forks encounter damage. DSBs can result in mutations and large-scale genome rearrangements reflecting mis-repair by non-homologous end joining or homologous recombination. Ionizing radiation induces genetic change immediately, and it also triggers delayed events weeks or even years after exposure, long after the initial damage has been repaired or diluted through cell division. This review covers DNA damage signaling and repair pathways and cell fate following genotoxic insult, including immediate and delayed genome instability and cell survival/cell death pathways.
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34
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Luukkonen J, Höytö A, Viluksela M, Juutilainen J, Naarala J. TCDD-induced mitochondrial superoxide production does not lead to mitochondrial degeneration or genomic instability in human SH-SY5Y neuroblastoma cells. Toxicol In Vitro 2017; 44:213-218. [PMID: 28673561 DOI: 10.1016/j.tiv.2017.06.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 05/30/2017] [Accepted: 06/29/2017] [Indexed: 01/18/2023]
Abstract
Several genotoxic and non-genotoxic agents have been reported to cause delayed genetic damage in the progeny of the exposed cells. Such induced genomic instability (IGI) may be a driving force in carcinogenesis, and it is thus highly important to understand the cellular events accompanying it. The aim of this study was to investigate whether 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) affects mitochondrial integrity and can consequently induce genomic instability. Mitochondrial integrity was evaluated by measuring mitochondrial superoxide production, mitochondrial membrane potential, and mitochondrial activity. Micronucleus formation was used to assess immediate genetic damage and IGI. The assays were performed either immediately, 8 or 15d after the exposure. Mitochondrial superoxide production was increased by TCDD immediately after the exposure. No consistent effects on mitochondrial integrity were observed at later time points, although slightly decreased mitochondrial membrane potential at 8d and increased mitochondrial superoxide potential production at 15 after exposure were observed in the TCDD-exposed cells. TCDD did not cause immediate genetic damage, and significant IGI was not observed. In conclusion, the present results suggest that immediate TCDD-induced increase in mitochondrial superoxide level does not lead to persistent loss of mitochondrial integrity or IGI in human SH-SY5Y neuroblastoma cells.
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Affiliation(s)
- Jukka Luukkonen
- University of Eastern Finland, Department of Environmental and Biological Sciences, Yliopistonranta 1, P.O. Box 1627, FI-70211 Kuopio, Finland.
| | - Anne Höytö
- University of Eastern Finland, Department of Environmental and Biological Sciences, Yliopistonranta 1, P.O. Box 1627, FI-70211 Kuopio, Finland
| | - Matti Viluksela
- University of Eastern Finland, Department of Environmental and Biological Sciences, Yliopistonranta 1, P.O. Box 1627, FI-70211 Kuopio, Finland; National Institute for Health and Welfare, Environmental Health Unit, Kuopio, Finland
| | - Jukka Juutilainen
- University of Eastern Finland, Department of Environmental and Biological Sciences, Yliopistonranta 1, P.O. Box 1627, FI-70211 Kuopio, Finland
| | - Jonne Naarala
- University of Eastern Finland, Department of Environmental and Biological Sciences, Yliopistonranta 1, P.O. Box 1627, FI-70211 Kuopio, Finland
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35
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Allen CP, Hirakawa H, Nakajima NI, Moore S, Nie J, Sharma N, Sugiura M, Hoki Y, Araki R, Abe M, Okayasu R, Fujimori A, Nickoloff JA. Low- and High-LET Ionizing Radiation Induces Delayed Homologous Recombination that Persists for Two Weeks before Resolving. Radiat Res 2017; 188:82-93. [PMID: 28535128 DOI: 10.1667/rr14748.1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Genome instability is a hallmark of cancer cells and dysregulation or defects in DNA repair pathways cause genome instability and are linked to inherited cancer predisposition syndromes. Ionizing radiation can cause immediate effects such as mutation or cell death, observed within hours or a few days after irradiation. Ionizing radiation also induces delayed effects many cell generations after irradiation. Delayed effects include hypermutation, hyper-homologous recombination, chromosome instability and reduced clonogenic survival (delayed death). Delayed hyperrecombination (DHR) is mechanistically distinct from delayed chromosomal instability and delayed death. Using a green fluorescent protein (GFP) direct repeat homologous recombination system, time-lapse microscopy and colony-based assays, we demonstrate that DHR increases several-fold in response to low-LET X rays and high-LET carbon-ion radiation. Time-lapse analyses of DHR revealed two classes of recombinants not detected in colony-based assays, including cells that recombined and then senesced or died. With both low- and high-LET radiation, DHR was evident during the first two weeks postirradiation, but resolved to background levels during the third week. The results indicate that the risk of radiation-induced genome destabilization via DHR is time limited, and suggest that there is little or no additional risk of radiation-induced genome instability mediated by DHR with high-LET radiation compared to low-LET radiation.
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Affiliation(s)
- Christopher P Allen
- a Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, Colorado
| | - Hirokazu Hirakawa
- b Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Chiba, Japan
| | - Nakako Izumi Nakajima
- b Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Chiba, Japan
| | - Sophia Moore
- a Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, Colorado
| | - Jingyi Nie
- a Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, Colorado
| | - Neelam Sharma
- a Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, Colorado
| | - Mayumi Sugiura
- c Division of Natural Sciences, Research Group of Biological Sciences, Nara Women's University, Nara, Japan
| | - Yuko Hoki
- b Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Chiba, Japan
| | - Ryoko Araki
- b Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Chiba, Japan
| | - Masumi Abe
- b Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Chiba, Japan
| | - Ryuichi Okayasu
- b Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Chiba, Japan
| | - Akira Fujimori
- b Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Chiba, Japan
| | - Jac A Nickoloff
- a Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, Colorado
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Brooks AL. The legacy of William Morgan: The PNNL years. Mutat Res 2017; 806:81-87. [PMID: 28347483 DOI: 10.1016/j.mrfmmm.2017.03.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 03/06/2017] [Indexed: 10/19/2022]
Affiliation(s)
- Antone L Brooks
- Washington State University, 6802 West 13th Kennewick, WA 99338, United States.
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Yu H, Sun SQ, Gu XB, Wang W, Gao XS. Atorvastatin prolongs the lifespan of radiation-induced reactive oxygen species in PC-3 prostate cancer cells to enhance the cell killing effect. Oncol Rep 2017; 37:2049-2056. [DOI: 10.3892/or.2017.5447] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Accepted: 08/23/2016] [Indexed: 11/05/2022] Open
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Affiliation(s)
- Muhammad Torequl Islam
- Postgraduate Program in Biotechnology, Northeast Biotechnology Network (RENORBIO), Federal University of Piauí, Teresina (Paiui), Brazil
- Department of Pharmacy, Southern University Bangladesh, Chittagong (Mehedibag), Bangladesh
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Shimura T, Sasatani M, Kawai H, Kamiya K, Kobayashi J, Komatsu K, Kunugita N. A comparison of radiation-induced mitochondrial damage between neural progenitor stem cells and differentiated cells. Cell Cycle 2017; 16:565-573. [PMID: 28118061 DOI: 10.1080/15384101.2017.1284716] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
Mitochondria play a key role in maintaining cellular homeostasis during stress responses, and mitochondrial dysfunction contributes to carcinogenesis, aging, and neurologic disease. We here investigated ionizing radiation (IR)-induced mitochondrial damage in human neural progenitor stem cells (NSCs), their differentiated counterparts and human normal fibroblasts. Long-term fractionated radiation (FR) with low doses of X-rays for 31 d enhanced mitochondrial activity as evident by elevated mitochondrial membrane potential (ΔΨm) and mitochondrial complex IV (cytochrome c oxidase) activity to fill the energy demands for the chronic DNA damage response in differentiated cells. Subsequent reduction of the antioxidant glutathione via continuous activation of mitochondrial oxidative phosphorylation caused oxidative stress and genomic instability in differentiated cells exposed to long-term FR. In contrast, long-term FR had no effect on the mitochondrial activity in NSCs. This cell type showed efficient DNA repair, no mitochondrial damage, and resistance to long-term FR. After high doses of acute single radiation (SR) (> 5 Gy), cell cycle arrest at the G2 phase was observed in NSCs and human fibroblasts. Under this condition, increase in mitochondria mass, mitochondrial DNA, and intracellular reactive oxygen species (ROS) levels were observed in the absence of enhanced mitochondrial activity. Consequently, cellular senescence was induced by high doses of SR in differentiated cells. In conclusion, we demonstrated that mitochondrial radiation responses differ according to the extent of DNA damage, duration of radiation exposure, and cell differentiation.
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Affiliation(s)
- Tsutomu Shimura
- a Department of Environmental Health , National Institute of Public Health , Wako , Saitama , Japan
| | - Megumi Sasatani
- b Department of Experimental Oncology , Research Center for Radiation Genome Medicine, Research Institute for Radiation Biology and Medicine (RIRBM), Hiroshima University , Hiroshima , Japan
| | - Hidehiko Kawai
- b Department of Experimental Oncology , Research Center for Radiation Genome Medicine, Research Institute for Radiation Biology and Medicine (RIRBM), Hiroshima University , Hiroshima , Japan
| | - Kenji Kamiya
- b Department of Experimental Oncology , Research Center for Radiation Genome Medicine, Research Institute for Radiation Biology and Medicine (RIRBM), Hiroshima University , Hiroshima , Japan
| | - Junya Kobayashi
- c Department of Genome Dynamics , Radiation Biology Center, Kyoto University , Kyoto , Japan
| | - Kenshi Komatsu
- c Department of Genome Dynamics , Radiation Biology Center, Kyoto University , Kyoto , Japan
| | - Naoki Kunugita
- a Department of Environmental Health , National Institute of Public Health , Wako , Saitama , Japan
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Shimura T, Sasatani M, Kamiya K, Kawai H, Inaba Y, Kunugita N. Mitochondrial reactive oxygen species perturb AKT/cyclin D1 cell cycle signaling via oxidative inactivation of PP2A in lowdose irradiated human fibroblasts. Oncotarget 2016; 7:3559-70. [PMID: 26657292 PMCID: PMC4823127 DOI: 10.18632/oncotarget.6518] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Accepted: 11/21/2015] [Indexed: 12/20/2022] Open
Abstract
Here we investigated the cellular response of normal human fibroblasts to repeated exposure to low-dose radiation. In contrast to acute single radiation, low-dose fractionated radiation (FR) with 0.01 Gy/fraction or 0.05 Gy/fraction for 31 days increased in mitochondrial mass, decreased cellular levels of the antioxidant glutathione and caused persistent accumulation of mitochondrial reactive oxygen species (ROS). Excess ROS promoted oxidative inactivation of protein phosphatase PP2A which in turn led to disruption of normal negative feed-back control of AKT/cyclin D1 signaling in cells treated with long-term FR. The resulting abnormal nuclear accumulation of cyclin D1 causes growth retardation, cellular senescence and genome instability in low-dose irradiated cells. Thus, loss of redox control and subsequently elevated levels of ROS perturb signal transduction as a result of oxidative stress. Our study highlights a specific role of mitochondrial ROS in perturbation of AKT/cyclin D1 cell cycle signaling after low-dose long-term FR. The antioxidants N-acetyl-L-cysteine, TEMPO and mitochondrial-targeted antioxidant Mito-TEMPO provided protection against the harmful cell cycle perturbations induced by low-dose long-term FR.
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Affiliation(s)
- Tsutomu Shimura
- Department of Environmental Health, National Institute of Public Health, Saitama, Japan
| | - Megumi Sasatani
- Department of Experimental Oncology, Research Institute for Radiation Biology and Medicine (RIRBM), Hiroshima University, Hiroshima, Japan
| | - Kenji Kamiya
- Department of Experimental Oncology, Research Institute for Radiation Biology and Medicine (RIRBM), Hiroshima University, Hiroshima, Japan
| | - Hidehiko Kawai
- Department of Molecular Radiobiology, Research Center for Radiation Genome Medicine, Research Institute for Radiation Biology and Medicine (RIRBM), Hiroshima University, Hiroshima, Japan
| | - Yohei Inaba
- Department of Environmental Health, National Institute of Public Health, Saitama, Japan
| | - Naoki Kunugita
- Department of Environmental Health, National Institute of Public Health, Saitama, Japan
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Brooks AL, Hoel DG, Preston RJ. The role of dose rate in radiation cancer risk: evaluating the effect of dose rate at the molecular, cellular and tissue levels using key events in critical pathways following exposure to low LET radiation. Int J Radiat Biol 2016; 92:405-26. [PMID: 27266588 PMCID: PMC4975094 DOI: 10.1080/09553002.2016.1186301] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 03/14/2016] [Accepted: 05/02/2016] [Indexed: 12/19/2022]
Abstract
PURPOSE This review evaluates the role of dose rate on cell and molecular responses. It focuses on the influence of dose rate on key events in critical pathways in the development of cancer. This approach is similar to that used by the U.S. EPA and others to evaluate risk from chemicals. It provides a mechanistic method to account for the influence of the dose rate from low-LET radiation, especially in the low-dose region on cancer risk assessment. Molecular, cellular, and tissues changes are observed in many key events and change as a function of dose rate. The magnitude and direction of change can be used to help establish an appropriate dose rate effectiveness factor (DREF). CONCLUSIONS Extensive data on key events suggest that exposure to low dose-rates are less effective in producing changes than high dose rates. Most of these data at the molecular and cellular level support a large (2-30) DREF. In addition, some evidence suggests that doses delivered at a low dose rate decrease damage to levels below that observed in the controls. However, there are some data human and mechanistic data that support a dose-rate effectiveness factor of 1. In summary, a review of the available molecular, cellular and tissue data indicates that not only is dose rate an important variable in understanding radiation risk but it also supports the selection of a DREF greater than one as currently recommended by ICRP ( 2007 ) and BEIR VII (NRC/NAS 2006 ).
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Affiliation(s)
- Antone L. Brooks
- Retired Professor, Environmental Science, Washington State University,
Richland,
Washington,
USA
| | - David G. Hoel
- Medical University of South Carolina, Epidemiology,
Charleston South Carolina,
USA
| | - R. Julian Preston
- US Environmental Protection Agency, National Health and Environmental Effects Research Laboratory (NHEERL) (MD B105-01), RTP,
USA
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42
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Franco A, Ciccarelli M, Sorriento D, Napolitano L, Fiordelisi A, Trimarco B, Durante M, Iaccarino G. Rays Sting: The Acute Cellular Effects of Ionizing Radiation Exposure. Transl Med UniSa 2016; 14:42-53. [PMID: 27326395 PMCID: PMC4912338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
High-precision radiation therapy is a clinical approach that uses the targeted delivery of ionizing radiation, and the subsequent formation of reactive oxygen species (ROS) in high proliferative, radiation sensitive cancers. In particular, in thoracic cancer ratdiation treatments, can not avoid a certain amount of cardiac toxicity. Given the low proliferative rate of cardiac myocytes, research has looked at the effect of radiation on endothelial cells and consequent coronary heart disease as the mechanism of ratdiation induced cardiotoxicity. In fact, little is known concerning the direct effect of radiation on mitochondria dynamis in cardiomyocyte. The main effect of ionizing radiation is the production of ROS and recent works have uncovered that they directly participates to pivotal cell function like mitochondrial quality control. In particular ROS seems to act as check point within the cell to promote either mitochondrial biogenesis and survival or mitochondrial damage and apoptosis. Thus, it appears evident that the functional state of the cell, as well as the expression patterns of molecules involved in mitochondrial metabolism may differently modulate mitochondrial fate in response to radiation induced ROS responses. Different molecules have been described to localize to mitochondria and regulate ROS production in response to stress, in particular GRK2. In this review we will discuss the evidences on the cardiac toxicity induced by X ray radiation on cardiomyocytes with emphasis on the role played by mitochondria dynamism.
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Affiliation(s)
- A Franco
- Department of Advanced Biomedical Sciences, “Federico II” University of Naples, Italy
| | - M Ciccarelli
- Department of Medicine and Surgery, University of Salerno, Italy
| | | | - L Napolitano
- Department of Advanced Biomedical Sciences, “Federico II” University of Naples, Italy
| | - A Fiordelisi
- Department of Advanced Biomedical Sciences, “Federico II” University of Naples, Italy
| | - B Trimarco
- Department of Advanced Biomedical Sciences, “Federico II” University of Naples, Italy
| | - M Durante
- Trento Institute for Fundamental Physics and Applications, Trento, Italy
| | - G Iaccarino
- Department of Medicine and Surgery, University of Salerno, Italy
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Shimura T, Kunugita N. Mitochondrial reactive oxygen species-mediated genomic instability in low-dose irradiated human cells through nuclear retention of cyclin D1. Cell Cycle 2016; 15:1410-4. [PMID: 27078622 DOI: 10.1080/15384101.2016.1170271] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Mitochondria are associated with various radiation responses, including adaptive responses, mitophagy, the bystander effect, genomic instability, and apoptosis. We recently identified a unique radiation response in the mitochondria of human cells exposed to low-dose long-term fractionated radiation (FR). Such repeated radiation exposure inflicts chronic oxidative stresses on irradiated cells via the continuous release of mitochondrial reactive oxygen species (ROS) and decrease in cellular levels of the antioxidant glutathione. ROS-induced oxidative mitochondrial DNA (mtDNA) damage generates mutations upon DNA replication. Therefore, mtDNA mutation and dysfunction can be used as markers to assess the effects of low-dose radiation. In this study, we present an overview of the link between mitochondrial ROS and cell cycle perturbation associated with the genomic instability of low-dose irradiated cells. Excess mitochondrial ROS perturb AKT/cyclin D1 cell cycle signaling via oxidative inactivation of protein phosphatase 2A after low-dose long-term FR. The resulting abnormal nuclear accumulation of cyclin D1 induces genomic instability in low-dose irradiated cells.
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Affiliation(s)
- Tsutomu Shimura
- a Department of Environmental Health , National Institute of Public Health , Wako , Saitama , Japan
| | - Naoki Kunugita
- a Department of Environmental Health , National Institute of Public Health , Wako , Saitama , Japan
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44
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The role of oxidative stress on breast cancer development and therapy. Tumour Biol 2016; 37:4281-91. [PMID: 26815507 DOI: 10.1007/s13277-016-4873-9] [Citation(s) in RCA: 157] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 01/15/2016] [Indexed: 02/07/2023] Open
Abstract
Reactive oxygen species (ROS) are produced by both enzymatic and non-enzymatic systems within eukaryotic cells and play important roles in cellular physiology and pathophysiology. Although physiological concentrations are crucial for ensuring cell survival, ROS overproduction is detrimental to cells, and considered key-factors for the development of several diseases, such as neurodegenerative diseases, cardiovascular disorders, and cancer. Cancer cells are usually submitted to higher ROS levels that further stimulate malignant phenotype through stimulus to sustained proliferation, death evasion, angiogenesis, invasiveness, and metastasis. The role of ROS on breast cancer etiology and progression is being progressively elucidated. However, less attention has been given to the development of redox system-targeted strategies for breast cancer therapy. In this review, we address the basic mechanisms of ROS production and scavenging in breast tumor cells, and the emerging possibilities of breast cancer therapies targeting ROS homeostasis.
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Pozolotina VN, Antonova EV, Shimalina NS. Adaptation of greater plantain, Plantago major L., to long-term radiation and chemical exposure. RUSS J ECOL+ 2016. [DOI: 10.1134/s1067413616010124] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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[Rapamycin decreases irradiation-induced hematopoietic system damage]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2016; 36:321-5. [PMID: 25916296 PMCID: PMC7342622 DOI: 10.3760/cma.j.issn.0253-2727.2015.04.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
目的 探讨雷帕霉素对60Co辐照小鼠造血系统损伤的保护作用。 方法 6~8周龄C57BL/6J小鼠分为未辐照组与辐照组,每组再分为雷帕霉素预处理组和对照组。雷帕霉素预处理组小鼠给予雷帕霉素4 mg/kg,隔日腹腔注射,共5次,辐照组小鼠于末次注射后第2天接受60Co全身照射(5 Gy)。辐照后第0.5、1、2、3、5、7、40、70天取外周血检测白细胞计数(WBC)、淋巴细胞计数(LYM)、红细胞计数(RBC)、血红蛋白含量(HGB)及血小板计数(PLT),辐照后第5天观察小鼠胸骨骨髓有核细胞数量及内源性脾集落情况。 结果 ①未辐照组:雷帕霉素预处理组WBC和LYM低于对照组(P值均<0.01),RBC和HGB高于对照组(P值均<0.05),PLT差异无统计学意义;两组小鼠骨髓有核细胞分布无差异。②辐照组:辐照后第0.5~7天雷帕霉素预处理组和对照组小鼠WBC、LYM均降低,两组比较差异无统计学意义,辐照后第40、70天均恢复,雷帕霉素预处理组均高于对照组(P<0.05);辐照后第3~7天RBC和HGB均降低,但雷帕霉素预处理组均高于单独辐照组(P<0.05),在辐照后第40、70天两组之间差异无统计学意义;PLT变化无明显规律。辐照后第5天,对照组小鼠骨髓有核细胞显著减少,但雷帕霉素预处理组有核细胞减少程度较对照组轻;雷帕霉素预处理组小鼠内源性脾集落数多于对照组(40.00±12.86对13.20±2.31,P=0.035)。 结论 雷帕霉素预处理可以减轻60Co辐照引起的小鼠外周血细胞和骨髓有核细胞的减少,促进造血系统恢复,保护脾造血单位。
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Shimura T, Kobayashi J, Komatsu K, Kunugita N. Severe mitochondrial damage associated with low-dose radiation sensitivity in ATM- and NBS1-deficient cells. Cell Cycle 2016; 15:1099-107. [PMID: 26940879 PMCID: PMC4889229 DOI: 10.1080/15384101.2016.1156276] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 02/08/2016] [Accepted: 02/15/2016] [Indexed: 10/22/2022] Open
Abstract
Low-dose radiation risks remain unclear owing to a lack of sufficient studies. We previously reported that low-dose, long-term fractionated radiation (FR) with 0.01 or 0.05 Gy/fraction for 31 d inflicts oxidative stress in human fibroblasts due to excess levels of mitochondrial reactive oxygen species (ROS). To identify the small effects of low-dose radiation, we investigated how mitochondria respond to low-dose radiation in radiosensitive human ataxia telangiectasia mutated (ATM)- and Nijmegen breakage syndrome (NBS)1-deficient cell lines compared with corresponding cell lines expressing ATM and NBS1. Consistent with previous results in normal fibroblasts, low-dose, long-term FR increased mitochondrial mass and caused accumulation of mitochondrial ROS in ATM- and NBS1-complemented cell lines. Excess mitochondrial ROS resulted in mitochondrial damage that was in turn recognized by Parkin, leading to mitochondrial autophagy (mitophagy). In contrast, ATM- and NBS1-deficient cells showed defective induction of mitophagy after low-dose, long-term FR, leading to accumulation of abnormal mitochondria; this was determined by mitochondrial fragmentation and decreased mitochondrial membrane potential. Consequently, apoptosis was induced in ATM- and NBS1-deficient cells after low-dose, long-term FR. Antioxidant N-acetyl-L-cysteine was effective as a radioprotective agent against mitochondrial damage induced by low-dose, long-term FR among all cell lines, including radiosensitive cell lines. In conclusion, we demonstrated that mitochondria are target organelles of low-dose radiation. Mitochondrial response influences radiation sensitivity in human cells. Our findings provide new insights into cancer risk estimation associated with low-dose radiation exposure.
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Affiliation(s)
- Tsutomu Shimura
- a Department of Environmental Health , National Institute of Public Health , Wako , Saitama , Japan
| | - Junya Kobayashi
- b Department of Genome Dynamics , Radiation Biology Center, Kyoto University , Kyoto , Japan
| | - Kenshi Komatsu
- b Department of Genome Dynamics , Radiation Biology Center, Kyoto University , Kyoto , Japan
| | - Naoki Kunugita
- a Department of Environmental Health , National Institute of Public Health , Wako , Saitama , Japan
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Massenkeil G, Zschieschang P, Thiel G, Hemmati PG, Budach V, Dörken B, Pross J, Arnold R. Frequent induction of chromosomal aberrations in in vivo skin fibroblasts after allogeneic stem cell transplantation: hints to chromosomal instability after irradiation. Radiat Oncol 2015; 10:266. [PMID: 26715553 PMCID: PMC4696175 DOI: 10.1186/s13014-015-0576-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 12/21/2015] [Indexed: 11/21/2022] Open
Abstract
Background Total body irradiation (TBI) has been part of standard conditioning regimens before allogeneic stem cell transplantation for many years. Its effect on normal tissue in these patients has not been studied extensively. Method We studied the in vivo cytogenetic effects of TBI and high-dose chemotherapy on skin fibroblasts from 35 allogeneic stem cell transplantation (SCT) patients. Biopsies were obtained prospectively (n = 18 patients) before, 3 and 12 months after allogeneic SCT and retrospectively (n = 17 patients) 23–65 months after SCT for G-banded chromosome analysis. Results Chromosomal aberrations were detected in 2/18 patients (11 %) before allogeneic SCT, in 12/13 patients (92 %) after 3 months, in all patients after 12 months and in all patients in the retrospective group after allogeneic SCT. The percentage of aberrant cells was significantly higher at all times after allogeneic SCT compared to baseline analysis. Reciprocal translocations were the most common aberrations, but all other types of stable, structural chromosomal aberrations were also observed. Clonal aberrations were observed, but only in three cases they were detected in independently cultured flasks. A tendency to non-random clustering throughout the genome was observed. The percentage of aberrant cells was not different between patients with and without secondary malignancies in this study group. Conclusion High-dose chemotherapy and TBI leads to severe chromosomal damage in skin fibroblasts of patients after SCT. Our long-term data suggest that this damage increases with time, possibly due to in vivo radiation-induced chromosomal instability.
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Affiliation(s)
- G Massenkeil
- Department of Hematology, Oncology and Tumor Immunology, Charité Universitätsmedizin Berlin, Berlin, Germany. .,Present address: Department of Internal Medicine, Clinic for Hematology and Oncology, Klinikum Guetersloh, Guetersloh, Germany.
| | - P Zschieschang
- Institute for Medical Genetics, Charité Universitätsmedizin Berlin, Berlin, Germany.,Present address: Medical practice for Human Genetics, Friedrichstrasse, Berlin, Germany
| | - G Thiel
- Institute for Medical Genetics, Charité Universitätsmedizin Berlin, Berlin, Germany.,Present address: Medical practice for Human Genetics, Friedrichstrasse, Berlin, Germany
| | - P G Hemmati
- Department of Hematology, Oncology and Tumor Immunology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - V Budach
- Clinic for Radiation Oncology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - B Dörken
- Department of Hematology, Oncology and Tumor Immunology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - J Pross
- Department of Hematology, Oncology and Tumor Immunology, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - R Arnold
- Department of Hematology, Oncology and Tumor Immunology, Charité Universitätsmedizin Berlin, Berlin, Germany
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Kesari KK, Luukkonen J, Juutilainen J, Naarala J. Genomic instability induced by 50Hz magnetic fields is a dynamically evolving process not blocked by antioxidant treatment. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2015; 794:46-51. [PMID: 26653983 DOI: 10.1016/j.mrgentox.2015.10.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2015] [Revised: 10/07/2015] [Accepted: 10/12/2015] [Indexed: 11/26/2022]
Abstract
Increased level of micronuclei was observed in SH-SY5Y cells in a previous study at 8 and 15 days after exposure to extremely low frequency (ELF) magnetic fields (MF), indicating possible induction of genomic instability in the progeny of the exposed cells. The aim of this study was to further explore the induction of genomic instability by ELF MFs by increasing the follow-up time up to 45 days after exposure. Human SH-SY5Y neuroblastoma cells were exposed to a 50Hz, 100μT MF for 24h with or without co-exposure to menadione (MQ), a chemical agent that increases cellular superoxide production. Micronuclei, reactive oxygen species (ROS) and lipid peroxidation (LPO) were measured at 15, 30 and 45 days after exposure. To study the possible causal role of ROS in the delayed effects of MF, the antioxidant N-acetylcysteine (NAC) was administered before MF exposure. Consistently with the previous study, the level of micronuclei was statistically significantly elevated 15 days after exposure. A similar effect was observed at 30 days, but not at 45 days after exposure. The level of LPO was statically significantly decreased 30 and 45 days after exposure. Consistently with our previous findings, the MF effect did not depend on co-exposure to MQ. Treatment with NAC effectively decreased cellular ROS level and suppressed the effect of MQ on ROS, but it did not block the MF effect, indicating that increase in ROS is not needed as a causal link between MF exposure and induction of delayed effects. The results presented here are consistent with genomic instability that persists in the progeny of MF-exposed cells up to at least 30 days after exposure. Changes in LPO observed at 30 and 45 days after exposure indicates that the MF-initiated process may continue up to at least 45 days after exposure.
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Affiliation(s)
- Kavindra Kumar Kesari
- Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland.
| | - Jukka Luukkonen
- Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland
| | - Jukka Juutilainen
- Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland
| | - Jonne Naarala
- Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland
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Ashcraft KA, Boss MK, Tovmasyan A, Roy Choudhury K, Fontanella AN, Young KH, Palmer GM, Birer SR, Landon CD, Park W, Das SK, Weitner T, Sheng H, Warner DS, Brizel DM, Spasojevic I, Batinic-Haberle I, Dewhirst MW. Novel Manganese-Porphyrin Superoxide Dismutase-Mimetic Widens the Therapeutic Margin in a Preclinical Head and Neck Cancer Model. Int J Radiat Oncol Biol Phys 2015; 93:892-900. [PMID: 26530759 DOI: 10.1016/j.ijrobp.2015.07.2283] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2015] [Revised: 07/20/2015] [Accepted: 07/24/2015] [Indexed: 11/29/2022]
Abstract
PURPOSE To test the effects of a novel Mn porphyrin oxidative stress modifier, Mn(III) meso-tetrakis(N-n-butoxyethylpyridinium-2-yl)porphyrin (MnBuOE), for its radioprotective and radiosensitizing properties in normal tissue versus tumor, respectively. METHODS AND MATERIALS Murine oral mucosa and salivary glands were treated with a range of radiation doses with or without MnBuOE to establish the dose-effect curves for mucositis and xerostomia. Radiation injury was quantified by intravital near-infrared imaging of cathepsin activity, assessment of salivation, and histologic analysis. To evaluate effects of MnBuOE on the tumor radiation response, we administered the drug as an adjuvant to fractionated radiation of FaDu xenografts. Again, a range of radiation therapy (RT) doses was administered to establish the radiation dose-effect curve. The 50% tumor control dose values with or without MnBuOE and dose-modifying factor were determined. RESULTS MnBuOE protected normal tissue by reducing RT-mediated mucositis, xerostomia, and fibrosis. The dose-modifying factor for protection against xerostomia was 0.77. In contrast, MnBuOE increased tumor local control rates compared with controls. The dose-modifying factor, based on the ratio of 50% tumor control dose values, was 1.3. Immunohistochemistry showed that MnBuOE-treated tumors exhibited a significant influx of M1 tumor-associated macrophages, which provides mechanistic insight into its radiosensitizing effects in tumors. CONCLUSIONS MnBuOE widens the therapeutic margin by decreasing the dose of radiation required to control tumor, while increasing normal tissue resistance to RT-mediated injury. This is the first study to quantitatively demonstrate the magnitude of a single drug's ability to radioprotect normal tissue while radiosensitizing tumor.
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Affiliation(s)
- Kathleen A Ashcraft
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina
| | - Mary-Keara Boss
- Department of Molecular Biomedical Sciences, North Carolina State College of Veterinary Medicine, Raleigh, North Carolina
| | - Artak Tovmasyan
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina
| | | | - Andrew N Fontanella
- Department of Biomedical Engineering, Duke University, Durham, North Carolina
| | - Kenneth H Young
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina
| | - Gregory M Palmer
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina
| | - Samuel R Birer
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina
| | - Chelsea D Landon
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina
| | - Won Park
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina
| | - Shiva K Das
- Physics and Computing Division, Department of Radiation Oncology, University of North Carolina School of Medicine, Chapel Hill, North Carolina
| | - Tin Weitner
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina
| | - Huaxin Sheng
- Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina
| | - David S Warner
- Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina
| | - David M Brizel
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina; Department of Surgery, Duke University Medical Center, Durham, North Carolina
| | - Ivan Spasojevic
- Department of Medicine, Duke University Medical Center, Durham, North Carolina
| | - Ines Batinic-Haberle
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina
| | - Mark W Dewhirst
- Department of Radiation Oncology, Duke University Medical Center, Durham, North Carolina; Department of Biostatistics and Bioinformatics, Duke University, Durham, North Carolina.
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