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Klein PM, Alaghband Y, Doan NL, Ru N, Drayson OGG, Baulch JE, Kramár EA, Wood MA, Soltesz I, Limoli CL. Acute, Low-Dose Neutron Exposures Adversely Impact Central Nervous System Function. Int J Mol Sci 2021; 22:9020. [PMID: 34445726 PMCID: PMC8396607 DOI: 10.3390/ijms22169020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 08/17/2021] [Accepted: 08/19/2021] [Indexed: 02/06/2023] Open
Abstract
A recognized risk of long-duration space travel arises from the elevated exposure astronauts face from galactic cosmic radiation (GCR), which is composed of a diverse array of energetic particles. There is now abundant evidence that exposures to many different charged particle GCR components within acute time frames are sufficient to induce central nervous system deficits that span from the molecular to the whole animal behavioral scale. Enhanced spacecraft shielding can lessen exposures to charged particle GCR components, but may conversely elevate neutron radiation levels. We previously observed that space-relevant neutron radiation doses, chronically delivered at dose-rates expected during planned human exploratory missions, can disrupt hippocampal neuronal excitability, perturb network long-term potentiation and negatively impact cognitive behavior. We have now determined that acute exposures to similar low doses (18 cGy) of neutron radiation can also lead to suppressed hippocampal synaptic signaling, as well as decreased learning and memory performance in male mice. Our results demonstrate that similar nervous system hazards arise from neutron irradiation regardless of the exposure time course. While not always in an identical manner, neutron irradiation disrupts many of the same central nervous system elements as acute charged particle GCR exposures. The risks arising from neutron irradiation are therefore important to consider when determining the overall hazards astronauts will face from the space radiation environment.
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Affiliation(s)
- Peter M. Klein
- Department of Neurosurgery, Stanford University, Stanford, CA 94305, USA; (P.M.K.); (I.S.)
| | - Yasaman Alaghband
- Department of Radiation Oncology, University of California, Irvine, CA 92697, USA; (Y.A.); (N.-L.D.); (N.R.); (O.G.G.D.); (J.E.B.)
| | - Ngoc-Lien Doan
- Department of Radiation Oncology, University of California, Irvine, CA 92697, USA; (Y.A.); (N.-L.D.); (N.R.); (O.G.G.D.); (J.E.B.)
| | - Ning Ru
- Department of Radiation Oncology, University of California, Irvine, CA 92697, USA; (Y.A.); (N.-L.D.); (N.R.); (O.G.G.D.); (J.E.B.)
| | - Olivia G. G. Drayson
- Department of Radiation Oncology, University of California, Irvine, CA 92697, USA; (Y.A.); (N.-L.D.); (N.R.); (O.G.G.D.); (J.E.B.)
| | - Janet E. Baulch
- Department of Radiation Oncology, University of California, Irvine, CA 92697, USA; (Y.A.); (N.-L.D.); (N.R.); (O.G.G.D.); (J.E.B.)
| | - Enikö A. Kramár
- Department of Neurobiology and Behavior, University of California, Irvine, CA 92697, USA; (E.A.K.); (M.A.W.)
| | - Marcelo A. Wood
- Department of Neurobiology and Behavior, University of California, Irvine, CA 92697, USA; (E.A.K.); (M.A.W.)
| | - Ivan Soltesz
- Department of Neurosurgery, Stanford University, Stanford, CA 94305, USA; (P.M.K.); (I.S.)
| | - Charles L. Limoli
- Department of Radiation Oncology, University of California, Irvine, CA 92697, USA; (Y.A.); (N.-L.D.); (N.R.); (O.G.G.D.); (J.E.B.)
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Hayashi T, Furukawa K, Morishita Y, Hayashi I, Kato N, Yoshida K, Kusunoki Y, Kyoizumi S, Ohishi W. Intracellular reactive oxygen species level in blood cells of atomic bomb survivors is increased due to aging and radiation exposure. Free Radic Biol Med 2021; 171:126-134. [PMID: 33992676 DOI: 10.1016/j.freeradbiomed.2021.05.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 04/26/2021] [Accepted: 05/09/2021] [Indexed: 12/20/2022]
Abstract
Although reactive oxygen species (ROS) play important roles in immune responses, excessive ROS production and accumulation might enhance the risk of inflammation-related diseases. Moreover, impaired immune function and the acceleration of pre-clinically persistent inflammation due to aging and radiation exposure have been observed in atomic bomb (A-bomb) survivors more than 60 years post-exposure. Meanwhile, the effects of aging and radiation exposure on ROS production in immune cells have not been characterized. This study investigated the relationship between intracellular ROS (H2O2 and O2•-) levels in blood cells or T cell subsets and serum iron, ferritin, and C-reactive protein (CRP) levels, as well as how these variables are affected by age and radiation exposure in A-bomb survivors. We examined 2495 Hiroshima A-bomb survivors. Multiple linear regression models adjusted for confounding factors indicated that intracellular O2•- levels in monocytes, granulocytes, and lymphocytes, and particularly in memory CD8+ T cells, including effector memory and terminally differentiated effector memory CD8+ T cells, increased with radiation dose. Additionally, serum iron, ferritin, and CRP levels affected intracellular ROS levels in specific blood cell types and T cell subsets. Serum CRP levels increased significantly with increasing age and radiation dose. Finally, when divided into three groups according to serum CRP levels, dose-dependent increases in the intracellular O2•- levels in blood cells and central memory and effector memory CD8+ T cells were most prominently observed in the high-CRP group. These results suggest that an increase in the levels of certain intracellular ROS, particularly after radiation exposure, might be linked to enhanced inflammatory status, including elevated serum CRP levels and reduced serum iron levels. This study reveals that aging and radiation exposure increase oxidative stress in blood cells, which is involved in impaired immune function and accelerated pre-clinically persistent inflammation in radiation-exposed individuals.
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Affiliation(s)
- Tomonori Hayashi
- Department of Molecular Biosciences, Radiation Effects Research Foundation, Hiroshima, 732-0815, Japan.
| | - Kyoji Furukawa
- Biostatistics Center, Kurume University, Kurume, 830-0011, Japan
| | - Yukari Morishita
- Department of Molecular Biosciences, Radiation Effects Research Foundation, Hiroshima, 732-0815, Japan
| | - Ikue Hayashi
- Central Research Laboratory, Hiroshima University Faculty of Medicine Graduate School of Biomedical and Health Sciences, Hiroshima, 734-8553, Japan
| | - Naohiro Kato
- Department of Statistics, Radiation Effects Research Foundation, Hiroshima, 732-0815, Japan
| | - Kengo Yoshida
- Department of Molecular Biosciences, Radiation Effects Research Foundation, Hiroshima, 732-0815, Japan
| | - Yoichiro Kusunoki
- Department of Molecular Biosciences, Radiation Effects Research Foundation, Hiroshima, 732-0815, Japan
| | - Seishi Kyoizumi
- Department of Molecular Biosciences, Radiation Effects Research Foundation, Hiroshima, 732-0815, Japan
| | - Waka Ohishi
- Department of Clinical Studies, Radiation Effects Research Foundation, Hiroshima, 732-0815, Japan
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Paredes A, Lindeblad M, Patil R, Neal MD, Hong Y, Smith B, Nanda JP, Mousafeiris V, Moulder J, Bosland MC, Lyubimov A, Bartholomew A. The New Zealand white rabbit animal model of acute radiation syndrome: hematopoietic and coagulation-based parameters by radiation dose following supportive care. Int J Radiat Biol 2020; 97:S45-S62. [PMID: 32909860 DOI: 10.1080/09553002.2020.1820606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE Animal models that accurately reflect human responses to radiation injury are needed for advanced mechanistic investigation and development of effective therapeutics. The rabbit is an established animal model accepted by the FDA for studies of cardiovascular disease, lipid metabolism, the development of anticoagulants, testing of bone implants, and the development of treatments for infectious diseases such as HIV. The purpose of this study was to investigate the New Zealand White (NZW) Rabbit model as a model of acute radiation exposure because of its established similarity to human vascular, immune, and coagulation responses. MATERIALS AND METHODS Two sequential studies were performed in a total of 81 male NZW rabbits, 16-20 weeks of age. All animals underwent clinical observations and peripheral blood analyses following a single dose of 0, 6, 7, 8, 8.5, 9, or 10 Gy of total body irradiation via a 6 MV Linear accelerator photon source on day 0. Animals were treated with timed release fentanyl patch (days 0-30), subcutaneous hydration (day 1, Study 2 only), and oral sulfamethoxazole/trimethoprim 30 mg/kg once daily (days 3-30) and were followed for 30 days or to time of mortality. RESULTS Study 1 revealed the estimated LD30, -50, -70, and -90 with 95% confidence intervals (CI) at 30 days to be 6.7 (CI: 5.9-7.4), 7.3 (CI: 6.7-7.8), 7.9 (CI: 7.3-8.4), and 8.8 (CI: 7.9-9.7) Gy, respectively. In study 2, a survey of blood coagulation and biochemical parameters were performed over time and necropsy. Complete blood counts taken from animals exposed to 7, 8, or 10 Gy, demonstrated dose-dependent depletion of lymphocytes, neutrophils, and platelets. Platelet counts recovered to baseline levels in survivors by day 30, whereas lymphocyte and neutrophil counts did not. Decedent animals demonstrated grade 3 or 4 neutropenia and lymphopenia at time of death; 64% of the decedents experienced a 30% or greater drop in hematocrit. Decedent animals demonstrated more than 100% increases from serum baseline levels of blood urea nitrogen, creatinine, aspartate aminotransferase, and triglyceride levels at the time of death whereas survivors on average demonstrated modest or no elevation. CONCLUSION This NZW rabbit model demonstrates dose-dependent depletion of hematopoietic parameters. The LD50/30 of 7.8 Gy (95% CI: 6.6-8.4) with supportive care appears to be close to the ranges reported for rhesus macaques (5.25-7.44 Gy) and humans (6-8 Gy) with supportive care. These findings support the utility of the NZW rabbit model for further mechanistic investigation of acute radiation exposure and medical countermeasure testing.
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Affiliation(s)
- Andre Paredes
- Department of Surgery, University of Illinois at Chicago, Chicago, IL, USA
| | - Matthew Lindeblad
- Department of Pharmacology, University of Illinois at Chicago, Chicago, IL, USA
| | - Rachana Patil
- Department of Surgery, University of Illinois at Chicago, Chicago, IL, USA
| | - Matthew D Neal
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA, USA
| | - Yuanfan Hong
- Department of Surgery, University of Illinois at Chicago, Chicago, IL, USA
| | - Brett Smith
- Department of Radiation Oncology, University of Illinois at Chicago, Chicago, IL, USA
| | - Joy P Nanda
- Community Research Advisory Council for Clinical and Translational Research, Johns Hopkins University, Baltimore, MD, USA
| | | | - John Moulder
- Medical College of Wisconsin, Milwaukee, WI, USA
| | - Maarten C Bosland
- Department of Pathology, University of Illinois at Chicago, Chicago, IL, USA
| | - Alexander Lyubimov
- Department of Pharmacology, University of Illinois at Chicago, Chicago, IL, USA
| | - Amelia Bartholomew
- Department of Surgery, University of Illinois at Chicago, Chicago, IL, USA
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Takahashi N, Misumi M, Murakami H, Niwa Y, Ohishi W, Inaba T, Nagamachi A, Suzuki G. Association between low doses of ionizing radiation, administered acutely or chronically, and time to onset of stroke in a rat model. JOURNAL OF RADIATION RESEARCH 2020; 61:666-673. [PMID: 32748938 PMCID: PMC7482173 DOI: 10.1093/jrr/rraa050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 05/10/2020] [Indexed: 06/10/2023]
Abstract
Exposure to high-doses of ionizing radiation has been reported to be associated with the risk of stroke. However, risks associated with lower dose exposures remain unclear, and there is little information available for the risk modification according to the dose-rate. There are few studies using animal models which might be able to provide complementary information on this association. In this study, the male stroke-prone spontaneously hypertensive rat (SHRSP) was used as a model animal. The rats were acutely irradiated with doses between 0 and 1.0 Gy or chronically irradiated with a cumulative dose of 0.5 or 1.0 Gy (at a dose rate of 0.05 or 0.1 Gy/day, respectively). The onset time of stroke related symptoms in SHRSP was used as an endpoint for evaluating the effects of low dose and the low dose-rate gamma-ray exposures. With respect to acute exposure, the time to the onset of stroke in the irradiated rats suggested the presence of a threshold around 0.1 Gy. For the low dose-rate chronically exposed, no significant increase in stroke symptom was observed. These findings are novel and demonstrate that the SHRSP system can be used to determine the association between the risk of stroke and radiation exposure with high sensitivity. Moreover, these studies provide important information regarding the association between the low dose and low dose-rate radiation exposure and circulatory diseases, especially stroke.
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Affiliation(s)
| | - Munechika Misumi
- Department of Statistics, Radiation Effects Research Foundation, Hiroshima, Japan
| | - Hideko Murakami
- Department of Molecular Biosciences, Radiation Effects Research Foundation, Hiroshima, Japan
| | - Yasuharu Niwa
- Department of Molecular Biosciences, Radiation Effects Research Foundation, Hiroshima, Japan
| | - Waka Ohishi
- Clinical Studies (Hiroshima), Radiation Effects Research Foundation (RERF), Hiroshima, Japan
| | - Toshiya Inaba
- Department of Molecular Oncology and Leukemia Program Project, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan
| | - Akiko Nagamachi
- Department of Molecular Oncology and Leukemia Program Project, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan
| | - Gen Suzuki
- International University of Health and Welfare Clinic, Otawara, Tochigi, Japan
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5
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Laiakis EC, Canadell MP, Grilj V, Harken AD, Garty GY, Astarita G, Brenner DJ, Smilenov L, Fornace AJ. Serum lipidomic analysis from mixed neutron/X-ray radiation fields reveals a hyperlipidemic and pro-inflammatory phenotype. Sci Rep 2019; 9:4539. [PMID: 30872747 PMCID: PMC6418166 DOI: 10.1038/s41598-019-41083-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 02/27/2019] [Indexed: 01/06/2023] Open
Abstract
Heightened threats for nuclear terrorism using improvised nuclear devices (IND) necessitate the development of biodosimetry assays that could rapidly assess thousands of individuals. However, the radiation exposures from an IND may be complex due to mixed fields of neutrons and photons (γ-rays), shielding from buildings, and proximity to the epicenter among others. In this study we utilized lipidomics to analyze serum samples from mice exposed to various percentages of neutrons and X-rays to a total dose of 3 Gy. Triacylglycerides, phosphatidylserines, lysophosphatidylethanolamines, lysophosphatidylcholines (LPCs), sphingolipids, and cholesteryl esters all showed delayed increases at day 7 compared to day 1 after irradiation, while diacylglycerides decreased in mixed field exposures and phosphatidylcholines (PCs) remained largely unchanged. Individual lipid molecules with a high degree of unsaturation exhibited the highest fold changes in mixed fields compared to photons alone. More importantly, the increased ratio of LPCs to PCs of each irradiation group compared to control could be used as a radiation biomarker and highlights the existence of a pro-inflammatory phenotype. The results showed that even a small percentage of neutrons in a mixed field can lead to high biological responses with implications for accurate biodosimetry, triage and medical managements of exposed populations.
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Affiliation(s)
- Evagelia C Laiakis
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, USA. .,Department of Biochemistry and Molecular & Cellular Biology, Georgetown University, Washington, DC, USA.
| | | | - Veljko Grilj
- Radiological Research Accelerator Facility, Columbia University, Irvington, NY, USA
| | - Andrew D Harken
- Radiological Research Accelerator Facility, Columbia University, Irvington, NY, USA
| | - Guy Y Garty
- Radiological Research Accelerator Facility, Columbia University, Irvington, NY, USA
| | - Giuseppe Astarita
- Department of Biochemistry and Molecular & Cellular Biology, Georgetown University, Washington, DC, USA
| | - David J Brenner
- Center for Radiological Research, Columbia University, New York, NY, USA
| | - Lubomir Smilenov
- Center for Radiological Research, Columbia University, New York, NY, USA
| | - Albert J Fornace
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, USA.,Department of Biochemistry and Molecular & Cellular Biology, Georgetown University, Washington, DC, USA
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Al Rashida VJM, Wang X, Myers OB, Boyce TW, Kocher E, Moreno M, Karr R, Ass'ad N, Cook LS, Sood A. Greater Odds for Angina in Uranium Miners Than Nonuranium Miners in New Mexico. J Occup Environ Med 2019; 61:1-7. [PMID: 30601436 PMCID: PMC6541557 DOI: 10.1097/jom.0000000000001482] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
OBJECTIVE The aim of this study was to test the hypothesis that uranium miners in New Mexico (NM) have a greater prevalence of cardiovascular disease than miners who extracted the nonuranium ore. METHODS NM-based current and former uranium miners were compared with nonuranium miners by using cross-sectional standardized questionnaire data from the Mining Dust in the United States (MiDUS) study from 1989 to 2016. RESULTS Of the 7215 eligible miners, most were men (96.3%). Uranium miners (n = 3151, 43.7%) were older and diabetic, but less likely to currently smoke or use snuff (P ≤ 0.001 for all). After adjustment for covariates, uranium miners were more likely to report angina (odds ratio 1.51, 95% confidence interval 1.23 to 1.85) than nonuranium miners. CONCLUSION Our data suggest that along with screening for pulmonary diseases, uranium industry workers should be screened for cardiovascular diseases.
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Affiliation(s)
- Vanessa J M Al Rashida
- Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, New Mexico (Drs al Rashida, Wang, Myers, Boyce, Kocher, Assad, Cook, Sood); Division of Cardiovascular Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas (Dr al Rashida); and Black Lung Program, Miners' Colfax Medical Center, Raton, New Mexico (Moreno, Karr, Dr Sood)
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Markabayeva A, Bauer S, Pivina L, Bjørklund G, Chirumbolo S, Kerimkulova A, Semenova Y, Belikhina T. Increased prevalence of essential hypertension in areas previously exposed to fallout due to nuclear weapons testing at the Semipalatinsk Test Site, Kazakhstan. ENVIRONMENTAL RESEARCH 2018; 167:129-135. [PMID: 30014894 DOI: 10.1016/j.envres.2018.07.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2018] [Revised: 07/06/2018] [Accepted: 07/07/2018] [Indexed: 06/08/2023]
Abstract
This study examines the association between environmental radiation exposure and essential hypertension in a series of investigated geographical districts adjacent to the Semipalatinsk nuclear test site in Kazakhstan. The sample consists of 2000 volunteers participants in screening examinations in three administrative districts close to the nuclear test site, which was carried out as part of the Government Programs on Environmental Health Hazard. The cross-sectional study compares prevalence ratios in a population sample with long-term exposure in the low and intermediate dose range. Age-adjusted odds ratios for hypertension were found significantly increased with higher exposure groups. After accounting for main cardiovascular risk factors into the model and stratifying by gender, the prevalence odds ratios for radiation remained significantly increased, with a significant dose-response effect observed for some but not all subgroups. The results support existing evidence of cardiovascular health effects of radiation exposure and of persisting environmental health issues that require attention in both epidemiological surveys and healthcare provision.
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Affiliation(s)
| | | | | | - Geir Bjørklund
- Council for Nutritional and Environmental Medicine, Toften 24, 8610 Mo i Rana, Norway.
| | - Salvatore Chirumbolo
- Department of Neuroscience, Biomedicine and Movement Sciences-University of Verona, Verona, Italy
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Sharma NK, Sharma R, Mathur D, Sharad S, Minhas G, Bhatia K, Anand A, Ghosh SP. Role of Ionizing Radiation in Neurodegenerative Diseases. Front Aging Neurosci 2018; 10:134. [PMID: 29867445 PMCID: PMC5963202 DOI: 10.3389/fnagi.2018.00134] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 04/23/2018] [Indexed: 02/03/2023] Open
Abstract
Ionizing radiation (IR) from terrestrial sources is continually an unprotected peril to human beings. However, the medical radiation and global radiation background are main contributors to human exposure and causes of radiation sickness. At high-dose exposures acute radiation sickness occurs, whereas chronic effects may persist for a number of years. Radiation can increase many circulatory, age related and neurodegenerative diseases. Neurodegenerative diseases occur a long time after exposure to radiation, as demonstrated in atomic bomb survivors, and are still controversial. This review discuss the role of IR in neurodegenerative diseases and proposes an association between neurodegenerative diseases and exposure to IR.
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Affiliation(s)
- Neel K. Sharma
- Armed Forces Radiobiology Research Institute, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Rupali Sharma
- Center for Neuroscience and Regenerative Medicine, Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Deepali Mathur
- Neurobiology Laboratory, School of Biotechnology, KIIT University, Bhubaneswar, India
| | - Shashwat Sharad
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Gillipsie Minhas
- Neuroscience Research Lab, Department of Neurology, Postgraduate Institute of Medical Education & Research (PGIMER), Chandigarh, India
| | | | - Akshay Anand
- Neuroscience Research Lab, Department of Neurology, Postgraduate Institute of Medical Education & Research (PGIMER), Chandigarh, India
| | - Sanchita P. Ghosh
- Armed Forces Radiobiology Research Institute, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
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Takamori A, Takahashi I, Kasagi F, Suyama A, Ozasa K, Yanagawa T. Mortality Analysis of the Life Span Study (LSS) Cohort Taking into Account Multiple Causes of Death Indicated in Death Certificates. Radiat Res 2017; 187:20-31. [DOI: 10.1667/rr14314.1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Ayako Takamori
- Graduate School of Medicine, Kurume University, Kurume, Japan
| | | | - Fumiyoshi Kasagi
- Institute of Radiation Epidemiology, Radiation Effects Association, Tokyo, Japan
| | - Akihiko Suyama
- Department of Epidemiology, Nagasaki, Japan, Radiation Effects Research Foundation, Hiroshima/Nagasaki, Japan
| | - Kotaro Ozasa
- Department of Epidemiology, Hiroshima, Japan, Radiation Effects Research Foundation, Hiroshima/Nagasaki, Japan
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10
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Abstract
Tissue reactions (deterministic effects) become manifest either early or late after doses above a threshold dose, which is the basis for recommended dose limits for avoiding such effects. Threshold doses have been defined for comparative purposes at 1% incidence of an effect, although the choice of incidence level may be scenario-dependent in practice. Latency time before manifestation is related to cell turnover rates and tissue complexity. In general, threshold doses become lower for longer follow-up times because of the slow progression of injury before manifestation, particularly after lower doses. Radiosensitive individuals may contribute to low threshold doses, which would provide a safety margin for the majority of a population. A threshold dose of 0.5 Gy was proposed for radiation-induced circulatory disease, after acute or chronic exposures, in the International Commission on Radiological Protection Publication 118. However, more recent meta-analyses of low-dose population studies suggest that, if a linear dose-incidence is assumed, the risk of some types of circulatory disease after doses <0.5 Gy or <10 mGy day(-1) may be positive and similar to that for induced cancer. Animal studies show that doses >2 Gy induce the expression of inflammatory and thrombotic molecules in endothelial cells. This causes progressive loss of capillaries in the heart and leads to reduced perfusion, myocardial cell death, and fibrosis. However, doses <1 Gy inhibit both inflammatory cell adhesion to endothelial cells and the development of atherosclerosis in mice. Different mechanisms of injury at low and high doses preclude the simple extrapolation of risk on a linear-quadratic basis from acute to chronic exposures.
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Affiliation(s)
- J H Hendry
- Christie Medical Physics and Engineering, Christie Hospital, Manchester M20 4BX, UK
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11
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Lee KF, Weng JTY, Hsu PWC, Chi YH, Chen CK, Liu IY, Chen YC, Wu LSH. Gene expression profiling of biological pathway alterations by radiation exposure. BIOMED RESEARCH INTERNATIONAL 2014; 2014:834087. [PMID: 25276823 PMCID: PMC4170887 DOI: 10.1155/2014/834087] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Accepted: 07/21/2014] [Indexed: 11/18/2022]
Abstract
Though damage caused by radiation has been the focus of rigorous research, the mechanisms through which radiation exerts harmful effects on cells are complex and not well-understood. In particular, the influence of low dose radiation exposure on the regulation of genes and pathways remains unclear. In an attempt to investigate the molecular alterations induced by varying doses of radiation, a genome-wide expression analysis was conducted. Peripheral blood mononuclear cells were collected from five participants and each sample was subjected to 0.5 Gy, 1 Gy, 2.5 Gy, and 5 Gy of cobalt 60 radiation, followed by array-based expression profiling. Gene set enrichment analysis indicated that the immune system and cancer development pathways appeared to be the major affected targets by radiation exposure. Therefore, 1 Gy radioactive exposure seemed to be a critical threshold dosage. In fact, after 1 Gy radiation exposure, expression levels of several genes including FADD, TNFRSF10B, TNFRSF8, TNFRSF10A, TNFSF10, TNFSF8, CASP1, and CASP4 that are associated with carcinogenesis and metabolic disorders showed significant alterations. Our results suggest that exposure to low-dose radiation may elicit changes in metabolic and immune pathways, potentially increasing the risk of immune dysfunctions and metabolic disorders.
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Affiliation(s)
- Kuei-Fang Lee
- Institute of Medical Sciences, Tzu Chi University, Hualien 970, Taiwan
- Laboratory for Cytogenetics, Center for Genetic Counseling, Buddhist Tzu Chi General Hospital, Hualien 970, Taiwan
| | - Julia Tzu-Ya Weng
- Innovation Center for Big Data and Digital Convergence, Yuan Ze University, Chungli 32003, Taiwan
- Department of Computer Science and Engineering, Yuan Ze University, Chungli 32003, Taiwan
| | - Paul Wei-Che Hsu
- Bioinformatics Core Laboratory, Institute of Molecular Biology, Academia Sinica, Taipei 11529, Taiwan
| | - Yu-Hsiang Chi
- Department of Computer Science and Engineering, Yuan Ze University, Chungli 32003, Taiwan
| | - Ching-Kai Chen
- Department of Computer Science and Engineering, Yuan Ze University, Chungli 32003, Taiwan
| | - Ingrid Y. Liu
- Institute of Medical Sciences, Tzu Chi University, Hualien 970, Taiwan
- Department of Molecular Biology and Human Genetics, Tzu Chi University, Hualien 970, Taiwan
| | - Yi-Cheng Chen
- Department of Computer Science & Information Engineering, Tamkang University, New Taipei City 25137, Taiwan
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