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Li Y, Bansal S, Sridharan V, Bansal S, Jayatilake MM, Fernández JA, Griffin JH, Boerma M, Cheema AK. Urinary Metabolomics for the Prediction of Radiation-Induced Cardiac Dysfunction. Metabolites 2023; 13:metabo13040525. [PMID: 37110184 PMCID: PMC10146652 DOI: 10.3390/metabo13040525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 04/02/2023] [Accepted: 04/03/2023] [Indexed: 04/08/2023] Open
Abstract
Survivors of acute radiation exposures are likely to experience delayed effects that manifest as injury in late-responding organs such as the heart. Noninvasive indicators of radiation-induced cardiac dysfunction are important in the prediction and diagnosis of this disease. In this study, we aimed to identify urinary metabolites indicative of radiation-induced cardiac damage by analyzing previously collected urine samples from a published study. The samples were collected from male and female wild-type (C57BL/6N) and transgenic mice constitutively expressing Activated Protein C (APCHi), a circulating protein with potential cardiac protective properties, that were exposed to 9.5 Gy of γ-rays. We utilized LC-MS-based metabolomics and lipidomics for the analysis of urine samples collected at 24 h, 1 week, 1 month, 3 months, and 6 months post-irradiation. Radiation caused perturbations in the TCA cycle, glycosphingolipid metabolism, fatty acid oxidation, purine catabolism, and amino acid metabolites, which were more prominent in wild-type (WT) mice compared to APCHi mice, suggesting a differential response between the two genotypes. After combining genotypes and sexes, we identified a multi-analyte urinary panel at early post-irradiation time points that predicted heart dysfunction using a logistic regression model with a discovery validation study design. These studies demonstrate the utility of a molecular phenotyping approach to develop a urinary biomarker panel predictive of delayed effects of ionizing radiation. It is important to note that no live mice were used or assessed in this study; instead, we focused solely on analyzing previously collected urine samples.
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Affiliation(s)
- Yaoxiang Li
- Department of Oncology, Lombardi Comprehensive Cancer Centre, Georgetown University Medical Center, Washington, DC 20057, USA
- Departments of Biochemistry, Molecular, and Cellular Biology, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Shivani Bansal
- Department of Oncology, Lombardi Comprehensive Cancer Centre, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Vijayalakshmi Sridharan
- Division of Radiation Health, Department of Pharmaceutical Sciences, 4301 West Markham #522-10, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA
| | - Sunil Bansal
- Department of Oncology, Lombardi Comprehensive Cancer Centre, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Meth M. Jayatilake
- Department of Oncology, Lombardi Comprehensive Cancer Centre, Georgetown University Medical Center, Washington, DC 20057, USA
| | - Jose A. Fernández
- Department of Molecular Medicine, Scripps Research Institute, La Jolla, CA 92037, USA
| | - John H. Griffin
- Department of Molecular Medicine, Scripps Research Institute, La Jolla, CA 92037, USA
| | - Marjan Boerma
- Division of Radiation Health, Department of Pharmaceutical Sciences, 4301 West Markham #522-10, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA
| | - Amrita K. Cheema
- Department of Oncology, Lombardi Comprehensive Cancer Centre, Georgetown University Medical Center, Washington, DC 20057, USA
- Departments of Biochemistry, Molecular, and Cellular Biology, Georgetown University Medical Center, Washington, DC 20057, USA
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Abstract
PURPOSE Cataract (opacification of the ocular lens) is a typical tissue reaction (deterministic effect) following ionizing radiation exposure, for which prevention dose limits have been recommended in the radiation protection system. Manifestations of radiation cataracts can vary among individuals, but such potential individual responses remain uncharacterized. Here we review relevant literature and discuss implications for radiation protection. This review assesses evidence for significant modification of radiation-induced cataractogenesis by age at exposure, sex and genetic factors based on current scientific literature. CONCLUSIONS In addition to obvious physical factors (e.g. dose, dose rate, radiation quality, irradiation volume), potential factors modifying individual responses for radiation cataracts include sex, age and genetics, with comorbidity and coexposures also having important roles. There are indications and preliminary data identifying such potential modifiers of radiation cataract incidence or risk, although no firm conclusions can yet be drawn. Further studies and a consensus on the evidence are needed to gain deeper insights into factors determining individual responses regarding radiation cataracts and the implications for radiation protection.
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Affiliation(s)
- Stephen G R Barnard
- UK Health Security Agency (UKHSA), Radiation, Chemical and Environmental Hazards Division (RCEHD), Didcot, UK
| | - Nobuyuki Hamada
- Biology and Environmental Chemistry Division, Sustainable System Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), Tokyo, Japan
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3
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Zhang J, Shang X, Liu Z, Tan X, He M, Han X, Luo L. Exogenous hormone use and the risk of surgically treated cataract: Evidence from 91 760 female participants in the 45 and Up Study. Acta Ophthalmol 2022; 101:e275-e285. [PMID: 36245397 DOI: 10.1111/aos.15267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 08/08/2022] [Accepted: 09/24/2022] [Indexed: 11/29/2022]
Abstract
PURPOSE To investigate the association between exogenous hormone use and the risk of cataract surgery among working-aged Australian women. METHODS A total of 91 760 female participants aged 45-65 years and without prior history of cataract surgery were prospectively enrolled between January 2006 and December 2009 in New South Wales (NSW), Australia. A baseline self-reported questionnaire was used to collect information on participant demographic, socio-economic, lifestyle characteristics, medical history as well as the use of hormonal contraception and hormone replacement therapy (HRT). Cataract surgery for these participants during 2006-2019 was determined according to the Medicare Benefits Schedule database. Cox regression was used to assess the association between exogenous hormone use and incident cataract surgery during the follow-up. RESULTS During a mean follow-up of 11.3 years, 10 444 participants underwent cataract surgery with a corresponding incidence of 11.4% (10 444/91 760). Compared with never users, ever and current users of HRT had a 22% and 14% increased risk of cataract surgery, respectively. A dose-response with longer HRT use resulting in a larger increase in cataract surgery risk was observed (p for trend <0.001). Among participants never used HRT, hormonal contraception had a protective effect against incident cataract surgery (hazards ratio: 0.87; 95% confidence interval: 0.80-0.94). CONCLUSIONS Use of HRT significantly increased the risk of cataract surgery, and hormonal contraception use had a protective effect on cataract surgery among HRT non-users. Further studies assessing the effect of different hormone types and doses are needed.
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Affiliation(s)
- Jiaqing Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Xianwen Shang
- Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, Melbourne, Victoria, Australia
| | - Zhenzhen Liu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Xuhua Tan
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Mingguang He
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China.,Centre for Eye Research Australia, Royal Victorian Eye and Ear Hospital, Melbourne, Victoria, Australia.,Ophthalmology, Department of Surgery, University of Melbourne, Melbourne, Victoria, Australia
| | - Xiaotong Han
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
| | - Lixia Luo
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangzhou, China
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4
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Ainsbury EA, Barnard SGR. Sensitivity and latency of ionising radiation-induced cataract. Exp Eye Res 2021; 212:108772. [PMID: 34562436 DOI: 10.1016/j.exer.2021.108772] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 08/26/2021] [Accepted: 09/20/2021] [Indexed: 01/29/2023]
Abstract
When managed with appropriate radiation protection procedures, ionising radiation is of great benefit to society. Opacification of the lens, and vision impairing cataract, have recently been recognised at potential effects of relatively low dose radiation exposure, on the order of 1 Gy or below. Within the last 10 years, understanding of the effects of low dose ionising radiation on the lens has increased, particularly in terms of DNA damage and responses, and how multiple radiation or other events in the lens might contribute to the overall risk of cataract. However, gaps remain, not least in the understanding of how radiation interacts with other risk factors such as aging, as well as the relative radiosensitivity of the lens compared to tissues of the body. This paper reviews the current literature in the field of low dose radiation cataract, with a particular focus on sensitivity and latency.
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Affiliation(s)
- Elizabeth A Ainsbury
- Public Health England, Centre for Radiation, Chemical and Environmental Hazards, Chilton, Didcot Oxford, OX11 ORQ, UK.
| | - Stephen G R Barnard
- Public Health England, Centre for Radiation, Chemical and Environmental Hazards, Chilton, Didcot Oxford, OX11 ORQ, UK.
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5
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Wishart TFL, Flokis M, Shu DY, Das SJ, Lovicu FJ. Hallmarks of lens aging and cataractogenesis. Exp Eye Res 2021; 210:108709. [PMID: 34339681 DOI: 10.1016/j.exer.2021.108709] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 07/05/2021] [Accepted: 07/26/2021] [Indexed: 12/18/2022]
Abstract
Lens homeostasis and transparency are dependent on the function and intercellular communication of its epithelia. While the lens epithelium is uniquely equipped with functional repair systems to withstand reactive oxygen species (ROS)-mediated oxidative insult, ROS are not necessarily detrimental to lens cells. Lens aging, and the onset of pathogenesis leading to cataract share an underlying theme; a progressive breakdown of oxidative stress repair systems driving a pro-oxidant shift in the intracellular environment, with cumulative ROS-induced damage to lens cell biomolecules leading to cellular dysfunction and pathology. Here we provide an overview of our current understanding of the sources and essential functions of lens ROS, antioxidative defenses, and changes in the major regulatory systems that serve to maintain the finely tuned balance of oxidative signaling vs. oxidative stress in lens cells. Age-related breakdown of these redox homeostasis systems in the lens leads to the onset of cataractogenesis. We propose eight candidate hallmarks that represent common denominators of aging and cataractogenesis in the mammalian lens: oxidative stress, altered cell signaling, loss of proteostasis, mitochondrial dysfunction, dysregulated ion homeostasis, cell senescence, genomic instability and intrinsic apoptotic cell death.
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Affiliation(s)
| | - Mary Flokis
- School of Medical Sciences, The University of Sydney, NSW, Australia
| | - Daisy Y Shu
- School of Medical Sciences, The University of Sydney, NSW, Australia; Save Sight Institute, The University of Sydney, NSW, Australia; Schepens Eye Research Institute of Mass Eye and Ear. Department of Ophthalmology, Harvard Medical School, Boston, MA, USA
| | - Shannon J Das
- School of Medical Sciences, The University of Sydney, NSW, Australia
| | - Frank J Lovicu
- School of Medical Sciences, The University of Sydney, NSW, Australia; Save Sight Institute, The University of Sydney, NSW, Australia.
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6
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McCarron RA, Barnard SGR, Babini G, Dalke C, Graw J, Leonardi S, Mancuso M, Moquet JE, Pawliczek D, Pazzaglia S, De Stefano I, Ainsbury EA. Radiation-Induced Lens Opacity and Cataractogenesis: A Lifetime Study Using Mice of Varying Genetic Backgrounds. Radiat Res 2021; 197:57-66. [PMID: 33984859 DOI: 10.1667/rade-20-00266.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 04/20/2021] [Indexed: 11/03/2022]
Abstract
Recent epidemiological findings and reanalysis of historical data suggest lens opacities resulting from ionizing radiation exposures are likely induced at lower doses than previously thought. These observations have led to ICRP recommendations for a reduction in the occupational dose limits for the eye lens, as well as subsequent implementation in EU member states. The EU CONCERT LDLensRad project was initiated to further understand the effects of ionizing radiation on the lens and identify the mechanism(s) involved in radiation-induced cataract, as well as the impact of dose and dose-rate. Here, we present the results of a long-term study of changes to lens opacity in male and female adult mice from a variety of different genetic (radiosensitive or radioresistant) backgrounds, including mutant strains Ercc2 and Ptch1, which were assumed to be susceptible to radiation-induced lens opacities. Mice received 0.5, 1 and 2 Gy 60Co gamma-ray irradiation at dose rates of 0.063 and 0.3 Gy min-1. Scheimpflug imaging was used to quantify lens opacification as an early indicator of cataract, with monthly observations taken postirradiation for an 18-month period in all strains apart from 129S2, which were observed for 12 months. Opacification of the lens was found to increase with time postirradiation (with age) for most mouse models, with ionizing radiation exposure increasing opacities further. Sex, dose, dose rate and genetic background were all found to be significant contributors to opacification; however, significant interactions were identified, which meant that the impact of these factors was strain dependent. Mean lens density increased with higher dose and dose rate in the presence of Ercc2 and Ptch1 mutations. This project was the first to focus on low (<1 Gy) dose, multiple dose rate, sex and strain effects in lens opacification, and clearly demonstrates the importance of these experimental factors in radiobiological investigations on the lens. The results provide insight into the effects of ionizing radiation on the lens as well as the need for further work in this area to underpin appropriate radiation protection legislation and guidance.
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Affiliation(s)
- R A McCarron
- Public Health England, Centre for Radiation, Chemical and Environmental Hazards, Chilton, United Kingdom
| | - S G R Barnard
- Public Health England, Centre for Radiation, Chemical and Environmental Hazards, Chilton, United Kingdom.,Durham University, School of Biosciences, Durham, United Kingdom
| | - G Babini
- Department of Physics, University of Pavia, Pavia, Italy.,Department of Woman and Child Health, Fondazione Policlinico A. Gemelli, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Rome, Italy
| | - C Dalke
- Helmholtz Zentrum München GmbH, German Research Centre for Environmental Health, Neuherberg, Germany
| | - J Graw
- Helmholtz Zentrum München GmbH, German Research Centre for Environmental Health, Neuherberg, Germany
| | - S Leonardi
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile (ENEA), Rome, Italy
| | - M Mancuso
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile (ENEA), Rome, Italy
| | - J E Moquet
- Public Health England, Centre for Radiation, Chemical and Environmental Hazards, Chilton, United Kingdom
| | - D Pawliczek
- Helmholtz Zentrum München GmbH, German Research Centre for Environmental Health, Neuherberg, Germany
| | - S Pazzaglia
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile (ENEA), Rome, Italy
| | - I De Stefano
- Laboratory of Biomedical Technologies, Agenzia Nazionale per le Nuove Tecnologie, l'Energia e lo Sviluppo Economico Sostenibile (ENEA), Rome, Italy
| | - E A Ainsbury
- Public Health England, Centre for Radiation, Chemical and Environmental Hazards, Chilton, United Kingdom
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7
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Deregulated estrogen receptor signaling and DNA damage response in breast tumorigenesis. Biochim Biophys Acta Rev Cancer 2020; 1875:188482. [PMID: 33260050 DOI: 10.1016/j.bbcan.2020.188482] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 11/05/2020] [Accepted: 11/12/2020] [Indexed: 02/07/2023]
Abstract
Carriers of BRCA1 mutations have a higher chance of developing cancers in hormone-responsive tissues like the breast, ovary and prostate, compared to other tissues. These tumors generally exhibit basal-like characters and do not express estrogen receptor (ER) or progesterone receptor (PR). Intriguingly, BRCA1 mutated breast cancers have a less favorable clinical outcome, as they will not respond to hormone therapy. BRCA1 has been reported to exhibit ligand dependent and independent transcriptional inhibition of ER-α; however, there exists a controversy on whether BRCA1 induces or inhibits ER-α expression. The mechanisms associated with resistance of BRCA1 mutated cancers to hormone therapy, as well as the tissue restriction exhibited by BRCA1 mutated tumors are still largely unknown. BRCA1 mutated tumors possess increased DNA damages and decreased genomic integrity, as BRCA1 plays a cardinal role in high fidelity DNA damage repair pathways, like homologous recombination (HR). The existence of cross regulatory signaling networks between ER-α and BRCA1 speculates a role of ER on BRCA1 dependent DDR pathways. Thus, the loss or haploinsufficiency of BRCA1 and the consequential deregulation of ER-α signaling may result in persistence of unrepaired DNA damages, eventually leading to tumorigenesis. Therefore, understanding of this cross-talk between ER-α and BRCA1, with regard to DDR, will provide critical insights to steer drug development and therapy for breast/ovarian cancers. This review discusses the mechanisms by which estrogen and ER signaling influence BRCA1 mediated DNA damage response and repair pathways in the mammalian system.
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Garrett J, Valluri S, Mendonca MS, Bigsby RM, Lopez J, Caperell-Grant A, Nees J, Dynlacht JR. The Protective Effect of Estrogen Against Radiation Cataractogenesis is Dependent Upon the Type of Radiation. Radiat Res 2020; 194:557-565. [PMID: 33045089 DOI: 10.1667/rade-20-00015.1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 09/11/2020] [Indexed: 11/03/2022]
Abstract
Astronauts participating in prolonged space missions constitute a population of individuals who are at an increased risk for cataractogenesis due to exposure to densely ionizing charged particles. Using a rat model, we have previously shown that after irradiation of eyes with either low-linear energy transfer (LET) 60Co γ rays or high-LET 56Fe particles, the rate of progression of anterior and posterior subcapsular cataracts was significantly greater in ovariectomized females implanted with 17-β-estradiol (E2) compared to ovariectomized or intact rats. However, our additional low-LET studies indicated that cataractogenesis may be a modifiable late effect, since we have shown that the modulation of cataractogenesis is dependent upon the timing of administration of E2. Interestingly, we found that E2 protected against cataractogenesis induced by low-LET radiation, but only if administered after the exposure; if administered prior to and after irradiation, for the entire period of observation, then E2 enhanced progression and incidence of cataracts. Since most radioprotectors tested to date are unsuccessful in protecting against the effects of high-LET radiation, we wished to determine whether the protection mediated by E2 against radiation cataractogenesis induced by low-LET radiation would also be observed after high-LET irradiation. Female 56-day-old Sprague-Dawley rats were treated with E2 at various times relative to the time of single-eye irradiation with 2 Gy of 56Fe ions. We found that administration of E2 before irradiation and throughout the lifetime of the rat enhanced cataractogenesis compared to ovariectomized animals. The enhancing effect was slightly reduced when estrogen was removed after irradiation. However, in contrast to what we observed after γ-ray irradiation, there was no inhibition of cataractogenesis if E2 was administered only after 56Fe-ion irradiation. We conclude that protection against cataractogenesis by estrogen is dependent upon the type and ionization density of radiation that the lens was exposed to. The lack of inhibition of radiation cataractogenesis in rats that receive E2 treatment after high-LET irradiation may be attributed to the qualitative differences in the types of DNA damage induced with high-LET radiation compared to low-LET radiation or how damage may be modified at the DNA or tissue level after irradiation.
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Affiliation(s)
- Joy Garrett
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Shailaja Valluri
- Department of Ophthalmology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Marc S Mendonca
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Robert M Bigsby
- Department of Obstetrics and Gynecology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Jennifer Lopez
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Andrea Caperell-Grant
- Department of Obstetrics and Gynecology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Jessica Nees
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Joseph R Dynlacht
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, Indiana 46202
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9
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Zych M, Wojnar W, Dudek S, Kaczmarczyk-Sedlak I. Rosmarinic and Sinapic Acids May Increase the Content of Reduced Glutathione in the Lenses of Estrogen-Deficient Rats. Nutrients 2019; 11:E803. [PMID: 30970573 PMCID: PMC6521282 DOI: 10.3390/nu11040803] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 03/20/2019] [Accepted: 04/05/2019] [Indexed: 12/13/2022] Open
Abstract
Oxidative stress is believed to be associated with both postmenopausal disorders and cataract development. Previously, we have demonstrated that rosmarinic and sinapic acids, which are diet-derived antioxidative phenolic acids, counteracted some disorders induced by estrogen deficiency. Other studies have shown that some phenolic acids may reduce cataract development in various animal models. However, there is no data on the effect of phenolic acids on oxidative stress markers in the lenses of estrogen-deficient rats. The study aimed to investigate whether administration of rosmarinic acid and sinapic acid affects the antioxidative abilities and oxidative damage parameters in the lenses of estrogen-deficient rats. The study was conducted on three-month-old female Wistar rats. The ovariectomized rats were orally treated with rosmarinic acid at doses of 10 and 50 mg/kg or sinapic acid at doses of 5 and 25 mg/kg, for 4 weeks. The content of reduced glutathione (GSH), oxidized glutathione and amyloid β1-42, as well as products of protein and lipid oxidation, were assessed. Moreover, the activities of superoxide dismutase, catalase, and some glutathione-related enzymes in the lenses were determined. Rosmarinic and sinapic acids in both doses resulted in an increase in the GSH content and glutathione reductase activity. They also improved parameters connected with protein oxidation. Since GSH plays an important role in maintaining the lens transparency, the increase in GSH content in lenses after the use of rosmarinic and sinapic acids seems to be beneficial. Therefore, both the investigated dietary compounds may be helpful in preventing cataract.
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Affiliation(s)
- Maria Zych
- Department of Pharmacognosy and Phytochemistry, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Jagiellońska 4, 41-200 Sosnowiec, Poland.
| | - Weronika Wojnar
- Department of Pharmacognosy and Phytochemistry, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Jagiellońska 4, 41-200 Sosnowiec, Poland.
| | - Sławomir Dudek
- Department of Pharmacognosy and Phytochemistry, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Jagiellońska 4, 41-200 Sosnowiec, Poland.
| | - Ilona Kaczmarczyk-Sedlak
- Department of Pharmacognosy and Phytochemistry, School of Pharmacy with the Division of Laboratory Medicine in Sosnowiec, Medical University of Silesia, Katowice, Jagiellońska 4, 41-200 Sosnowiec, Poland.
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10
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Risk of various types of cataracts in a cohort of Mayak workers following chronic occupational exposure to ionizing radiation. Eur J Epidemiol 2018; 33:1193-1204. [DOI: 10.1007/s10654-018-0450-4] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 10/03/2018] [Indexed: 11/27/2022]
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Fukutsu K, Kase S, Ishijima K, Kinoshita R, Ishida S. The clinical features of radiation cataract in patients with ocular adnexal mucosa-associated lymphoid tissue lymphoma. Radiat Oncol 2018; 13:95. [PMID: 29769097 PMCID: PMC5956840 DOI: 10.1186/s13014-018-1045-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 05/02/2018] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND To examine the clinical features of radiation cataract in patients with ocular adnexal mucosa-associated lymphoid tissue (MALT) lymphoma. METHODS Twenty-one patients with 26 eyes diagnosed with ocular adnexal MALT lymphoma (26 eyes), who were treated in Hokkaido University Hospital, were retrospectively reviewed based on medical records. RESULTS Out of the 21 patients, 16 patients (21 eyes) received radiation therapy (RT) with a total dose of 30 Gy. All cases eventually achieved complete remission. Eight of these patients (11 eyes: 52.3%) required cataract surgery after RT. The mean age at surgery was 56.8 (40-70) years. The mean latency between RT and the indication for surgery was 43.3 months. The percentage of females was significantly higher in patients who required surgery (P < 0.01), compared with those without surgery. The eyes of patients who received bolus technique on radiation treatment developed cataract more frequently (P < 0.05). In contrast, none of the patients without RT required cataract surgery. CONCLUSIONS Patients with ocular adnexal MALT lymphoma who underwent surgery for radiation cataract were seen more often in relatively young, female patients, and surgery was required about 3 years after RT. A long-term observation may be needed for patients after RT for a tumor. A female sex and the bolus technique may be risk factors for radiation cataract.
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Affiliation(s)
- Kanae Fukutsu
- Department of Ophthalmology, Hokkaido University Graduate School of Medicine, N-15, W-7, Kita-ku, Sapporo, 060-8638, Japan
| | - Satoru Kase
- Department of Ophthalmology, Hokkaido University Graduate School of Medicine, N-15, W-7, Kita-ku, Sapporo, 060-8638, Japan.
| | - Kan Ishijima
- Department of Ophthalmology, Hokkaido University Graduate School of Medicine, N-15, W-7, Kita-ku, Sapporo, 060-8638, Japan
| | - Rumiko Kinoshita
- Department of Radiation Oncology, Hokkaido University Hospital, Sapporo, Japan
| | - Susumu Ishida
- Department of Ophthalmology, Hokkaido University Graduate School of Medicine, N-15, W-7, Kita-ku, Sapporo, 060-8638, Japan
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12
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Hashimoto S, Yoshikawa H, Miyagi M, Onishi Y, Ohga S, Asai K, Ishibashi T. Cataracts after Low-Dose Radiotherapy for Lymphoproliferative Disease of the Ocular Adnexa. Semin Ophthalmol 2017; 32:702-706. [DOI: 10.3109/08820538.2016.1170159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Sawako Hashimoto
- Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Hiroshi Yoshikawa
- Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Michiko Miyagi
- Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Yoko Onishi
- Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Saiji Ohga
- Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Kaori Asai
- Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - Tatsuro Ishibashi
- Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Kleiman NJ, Stewart FA, Hall EJ. Modifiers of radiation effects in the eye. LIFE SCIENCES IN SPACE RESEARCH 2017; 15:43-54. [PMID: 29198313 DOI: 10.1016/j.lssr.2017.07.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Revised: 07/05/2017] [Accepted: 07/17/2017] [Indexed: 06/07/2023]
Abstract
World events, including the threat of radiological terrorism and the fear of nuclear accidents, have highlighted an urgent need to develop medical countermeasures to prevent or reduce radiation injury. Similarly, plans for manned spaceflight to a near-Earth asteroid or journey to Mars raise serious concerns about long-term effects of space radiation on human health and the availability of suitable therapeutic interventions. At the same time, the need to protect normal tissue from the deleterious effects of radiotherapy has driven considerable research into the design of effective radioprotectors. For more than 70 years, animal models of radiation cataract have been utilized to test the short and long-term efficacy of various radiation countermeasures. While some compounds, most notably the Walter Reed (WR) class of radioprotectors, have reported limited effectiveness when given before exposure to low-LET radiation, the human toxicity of these molecules at effective doses limits their usefulness. Furthermore, while there has been considerable testing of eye responses to X- and gamma irradiation, there is limited information about using such models to limit the injurious effects of heavy ions and neutrons on eye tissue. A new class of radioprotector molecules, including the sulfhydryl compound PrC-210, are reported to be effective at much lower doses and with far less side effects. Their ability to modify ocular radiation damage has not yet been examined. The ability to non-invasively measure sensitive, radiation-induced ocular changes over long periods of time makes eye models an attractive option to test the radioprotective and radiation mitigating abilities of new novel compounds.
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Affiliation(s)
- Norman J Kleiman
- Department of Environmental Health Sciences, Eye Radiation and Environmental Research Laboratory, Columbia University, Mailman School of Public Health, 722 West 168th St., 11th Floor, New York, NY 10032, USA.
| | - Fiona A Stewart
- Division of Biological Stress Response, Netherlands Cancer Institute, 1006 BE Amsterdam, The Netherlands
| | - Eric J Hall
- Center for Radiological Research, Columbia University, College of Physicians and Surgeons, 630 W. 168th St., New York, NY 10032, USA
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Ainsbury EA, Barnard S, Bright S, Dalke C, Jarrin M, Kunze S, Tanner R, Dynlacht JR, Quinlan RA, Graw J, Kadhim M, Hamada N. Ionizing radiation induced cataracts: Recent biological and mechanistic developments and perspectives for future research. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2016; 770:238-261. [DOI: 10.1016/j.mrrev.2016.07.010] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 07/27/2016] [Accepted: 07/28/2016] [Indexed: 02/06/2023]
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Pannkuk EL, Laiakis EC, Authier S, Wong K, Fornace AJ. Global Metabolomic Identification of Long-Term Dose-Dependent Urinary Biomarkers in Nonhuman Primates Exposed to Ionizing Radiation. Radiat Res 2015; 184:121-33. [PMID: 26230079 DOI: 10.1667/rr14091.1] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Due to concerns surrounding potential large-scale radiological events, there is a need to determine robust radiation signatures for the rapid identification of exposed individuals, which can then be used to guide the development of compact field deployable instruments to assess individual dose. Metabolomics provides a technology to process easily accessible biofluids and determine rigorous quantitative radiation biomarkers with mass spectrometry (MS) platforms. While multiple studies have utilized murine models to determine radiation biomarkers, limited studies have profiled nonhuman primate (NHP) metabolic radiation signatures. In addition, these studies have concentrated on short-term biomarkers (i.e., <72 h). The current study addresses the need for biomarkers beyond 72 h using a NHP model. Urine samples were collected at 7 days postirradiation (2, 4, 6, 7 and 10 Gy) and processed with ultra-performance liquid chromatography (UPLC) quadrupole time-of-flight (QTOF) MS, acquiring global metabolomic radiation signatures. Multivariate data analysis revealed clear separation between control and irradiated groups. Thirteen biomarkers exhibiting a dose response were validated with tandem MS. There was significantly higher excretion of l-carnitine, l-acetylcarnitine, xanthine and xanthosine in males versus females. Metabolites validated in this study suggest perturbation of several pathways including fatty acid β oxidation, tryptophan metabolism, purine catabolism, taurine metabolism and steroid hormone biosynthesis. In this novel study we detected long-term biomarkers in a NHP model after exposure to radiation and demonstrate differences between sexes using UPLC-QTOF-MS-based metabolomics technology.
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Affiliation(s)
- Evan L Pannkuk
- a Department of Biochemistry and Molecular & Cellular Biology, Georgetown University Medical Center, Washington, DC
| | - Evagelia C Laiakis
- a Department of Biochemistry and Molecular & Cellular Biology, Georgetown University Medical Center, Washington, DC
| | | | | | - Albert J Fornace
- a Department of Biochemistry and Molecular & Cellular Biology, Georgetown University Medical Center, Washington, DC;,c Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC; and.,d Center of Excellence in Genomic Medicine Research, King Abdulaziz University, Jeddah 22254, Saudi Arabia
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Laiakis EC, Mak TD, Anizan S, Amundson SA, Barker CA, Wolden SL, Brenner DJ, Fornace AJ. Development of a metabolomic radiation signature in urine from patients undergoing total body irradiation. Radiat Res 2014; 181:350-61. [PMID: 24673254 PMCID: PMC4071158 DOI: 10.1667/rr13567.1] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The emergence of the threat of radiological terrorism and other radiological incidents has led to the need for development of fast, accurate and noninvasive methods for detection of radiation exposure. The purpose of this study was to extend radiation metabolomic biomarker discovery to humans, as previous studies have focused on mice. Urine was collected from patients undergoing total body irradiation at Memorial Sloan-Kettering Cancer Center prior to hematopoietic stem cell transplantation at 4-6 h postirradiation (a single dose of 1.25 Gy) and 24 h (three fractions of 1.25 Gy each). Global metabolomic profiling was obtained through analysis with ultra performance liquid chromatography coupled to time-of-flight mass spectrometry (TOFMS). Prior to further analyses, each sample was normalized to its respective creatinine level. Statistical analysis was conducted by the nonparametric Kolmogorov-Smirnov test and the Fisher's exact test and markers were validated against pure standards. Seven markers showed distinct differences between pre- and post-exposure samples. Of those, trimethyl-l-lysine and the carnitine conjugates acetylcarnitine, decanoylcarnitine and octanoylcarnitine play an important role in the transportation of fatty acids across mitochondria for subsequent fatty acid β-oxidation. The remaining metabolites, hypoxanthine, xanthine and uric acid are the final products of the purine catabolism pathway, and high levels of excretion have been associated with increased oxidative stress and radiation induced DNA damage. Further analysis revealed sex differences in the patterns of excretion of the markers, demonstrating that generation of a sex-specific metabolomic signature will be informative and can provide a quick and reliable assessment of individuals in a radiological scenario. This is the first radiation metabolomics study in human urine laying the foundation for the use of metabolomics in biodosimetry and providing confidence in biomarker identification based on the overlap between animal models and humans.
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Affiliation(s)
- Evagelia C. Laiakis
- Department of Biochemistry and Molecular & Cellular Biology, Georgetown University, Washington DC
| | - Tytus D. Mak
- Lombardi Comprehensive Cancer Center, Georgetown University, Washington DC
| | - Sebastien Anizan
- Lombardi Comprehensive Cancer Center, Georgetown University, Washington DC
| | - Sally A. Amundson
- Center for Radiological Research, Department of Radiation Oncology, Columbia University Medical Center, New York, New York
| | - Christopher A. Barker
- Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - Suzanne L. Wolden
- Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - David J. Brenner
- Center for Radiological Research, Department of Radiation Oncology, Columbia University Medical Center, New York, New York
| | - Albert J. Fornace
- Department of Biochemistry and Molecular & Cellular Biology, Georgetown University, Washington DC
- Lombardi Comprehensive Cancer Center, Georgetown University, Washington DC
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Dynlacht JR. The role of age, sex and steroid sex hormones in radiation cataractogenesis. Radiat Res 2013; 180:559-66. [PMID: 24261552 DOI: 10.1667/rr13549.1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
It is critical to identify and gain a better understanding of the factors that enhance or reduce the risk of cataractogenesis, to minimize the possibility of occurrence after deliberate (e.g., radiation therapy, interplanetary travel) or unintentional exposure to ionizing radiation. Both gender and age at the time of exposure have been established as key determinants of cataractogenesis induced by sparsely ionizing (low-LET) and densely ionizing (high-LET) radiation. However, animal data from several older studies are often conflicting and somewhat difficult to interpret, in that the experiments suffered from small group sizes, limited dose ranges or short periods of observation, and human data are sparse or statistical significance is sometimes limited. Steroid sex hormones (SSH) may underlie age and gender-based differences in the progression and prevalence of cataracts that otherwise occur spontaneously in humans and animal models, and may also underlie age and sex-related differences in radiation cataractogenesis. Here, we review data that have aided in our understanding of the role of age, sex and steroid sex hormones in radiation cataractogenesis.
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Affiliation(s)
- Joseph R Dynlacht
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, Indiana 46202
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Pomegranate supplementation improves affective and motor behavior in mice after radiation exposure. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 2013:940830. [PMID: 23662154 PMCID: PMC3639646 DOI: 10.1155/2013/940830] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Accepted: 03/04/2013] [Indexed: 12/20/2022]
Abstract
Currently, NASA has plans for extended space travel, and previous research indicates that space radiation can have negative effects on cognitive skills as well as physical and mental health. With long-term space travel, astronauts will be exposed to greater radiation levels. Research shows that an antioxidant-enriched diet may offer some protection against the cellular effects of radiation and may provide significant neuroprotection from the effects of radiation-induced cognitive and behavioral skill deficits. Ninety-six C57BL/6 mice (48 pomegranate fed and 48 control) were irradiated with proton radiation (2 Gy), and two-month postradiation behaviors were assessed using a battery of behavioral tests to measure cognitive and motor functions. Proton irradiation was associated with depression-like behaviors in the tail suspension test, but this effect was ameliorated by the pomegranate diet. Males, in general, displayed worse coordination and balance than females on the rotarod task, and the pomegranate diet ameliorated this effect. Overall, it appears that proton irradiation, which may be encountered in space, may induce a different pattern of behavioral deficits in males than females and that a pomegranate diet may confer protection against some of those effects.
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Ozgen SÇ, Dökmeci D, Akpolat M, Karadağ CH, Gündüz O, Erbaş H, Benian O, Uzal C, Turan FN. The Protective Effect of Curcumin on Ionizing Radiation-induced Cataractogenesis in Rats. Balkan Med J 2012; 29:358-63. [PMID: 25207034 DOI: 10.5152/balkanmedj.2012.038] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Accepted: 05/22/2012] [Indexed: 01/09/2023] Open
Abstract
OBJECTIVE The aim of the study was to determine the protective effect of curcumin against ionizing radiation-induced cataract in the lens of rats. MATERIAL AND METHODS Rats were divided into six groups. Group 1: Control, Group 2: Dimethyl sulfoxide (DMSO), Group 3: DMSO+curcumin, Group 4: Irradiation, Group 5: Irradiation+DMSO, Group 6: Irradiation+DMSO+curcumin. A 15 Gy total dose was given to 4, 5, 6 groups for radiation damage. Curcumin (100 mg/kg) was dissolved in DMSO and given by intragastric intubation for 28 days. At the end of the experiment, lenses were graded and enucleated. The lenticular activity of the antioxidant enzymes, total antioxidant and glutathione peroxidase (GSH-Px), and the malondialdehyde (MDA) were measured. RESULTS 100% Cataract was seen in the irradiation group. Cataract rate fell to 40% and was limited at grade 1 and 2 in the curcumin group. In the irradiation group, antioxidant enzyme levels were decreased, MDA levels were increased. There was an increase in antioxidant enzyme levels and a significant decrease in MDA in the group which was given curcumin. CONCLUSION Curcumin has antioxidant and radioprotective properties and is likely to be a valuable agent for protection against ionizing radiation. Hence, it may be used as an antioxidant and radioprotector against radiation-induced cataractogenesis.
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Affiliation(s)
- Seher Çimen Ozgen
- Department of Pharmacology, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Dikmen Dökmeci
- Department of Pharmacology, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Meryem Akpolat
- Department of Histology and Embryology, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Cetin Hakan Karadağ
- Department of Pharmacology, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Ozgür Gündüz
- Department of Pharmacology, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Hakan Erbaş
- Department of Biochemistry, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Omer Benian
- Department of Ophtalmology, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Cem Uzal
- Department of Radiation Oncology, Faculty of Medicine, Trakya University, Edirne, Turkey
| | - Fatma Nesrin Turan
- Department of Biostatistics, Faculty of Medicine, Trakya University, Edirne, Turkey
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Abstract
Until very recently, ocular exposure guidelines were based on the assumption that radiation cataract is a deterministic event requiring threshold doses generally greater than 2 Gy. This view was, in part, based on older studies which generally had short follow-up periods, failed to take into account increasing latency as dose decreased, had relatively few subjects with doses below a few Gy, and were not designed to detect early lens changes. Newer findings, including those in populations exposed to much lower radiation doses and in subjects as diverse as astronauts, medical workers, atomic bomb survivors, accidentally exposed individuals, and those undergoing diagnostic or radiotherapeutic procedures, strongly suggest dose-related lens opacification at significantly lower doses. These observations resulted in a recent re-evaluation of current lens occupational exposure guidelines, and a proposed lowering of the presumptive radiation cataract threshold to 0.5 Gy/year and the occupational lens exposure limit to 20 mSv/year, regardless of whether received as an acute, protracted, or chronic exposure. Experimental animal studies support these conclusions and suggest a role for genotoxicity in the development of radiation cataract. Recent findings of a low or even zero threshold for radiation-induced lens opacification are likely to influence current research efforts and directions concerning the cellular and molecular mechanisms underlying this pathology. Furthermore, new guidelines are likely to have significant implications for occupational and/or accidental exposure, and the need for occupational eye protection (e.g. in fields such as interventional medicine).
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Affiliation(s)
- N J Kleiman
- Eye Radiation and Environmental Research Laboratory, Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY 10032, USA.
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Chylack LT, Feiveson AH, Peterson LE, Tung WH, Wear ML, Marak LJ, Hardy DS, Chappell LJ, Cucinotta FA. NASCA report 2: Longitudinal study of relationship of exposure to space radiation and risk of lens opacity. Radiat Res 2012; 178:25-32. [PMID: 22687051 DOI: 10.1667/rr2876.1] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The NASA Study of Cataract in Astronauts (NASCA) was designed to measure the impact of exposure to space radiation on progression rates of cortical, nuclear, and posterior subcapsular cataract in U.S. astronauts who have flown in space and comparison groups of astronauts who had not flown in space, and subjects with a history of military aviation. We present our analyses of 5 years of data with an average of 3.8 exams per subject. All subjects had digital lens images with the Nidek EAS 1000 Lens Imaging System. Because of high variability and skewness of opacity measures, nonparametric methods were used to test for association between rates of opacification and space radiation exposure. First, median regression was used to collapse longitudinal data into robust estimates of progression rates (opacity severity compare to time for each eye of each subject). To quantify and test for a radiation effect, median regression with the dependent variable being the maximum of the two slopes (OD and OS) per subject was then used, adjusting for the confounding variables of age, nutritional, and sun-exposure histories. Median regression showed evidence of an association between the rate of cortical progression in the worse eye with radiation dose and age. The estimated median progression rate from space radiation being 0.25 ± 0.13% lens area/Sv/year (P = 0.062). We found no relationship between radiation exposure and progression of aggregate area of posterior subcapsular cataract or nuclear progression rates. However, longer follow-up may be needed to further understand any impact of space radiation on progression rates for posterior subcapsular cataracts and nuclear cataracts, and to characterize changes to visual acuity.
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Affiliation(s)
- Leo T Chylack
- a Center for Ophthalmic Research, Brigham and Women's Hospital, Boston, Massachusetts
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Stewart FA, Akleyev AV, Hauer-Jensen M, Hendry JH, Kleiman NJ, Macvittie TJ, Aleman BM, Edgar AB, Mabuchi K, Muirhead CR, Shore RE, Wallace WH. ICRP publication 118: ICRP statement on tissue reactions and early and late effects of radiation in normal tissues and organs--threshold doses for tissue reactions in a radiation protection context. Ann ICRP 2012; 41:1-322. [PMID: 22925378 DOI: 10.1016/j.icrp.2012.02.001] [Citation(s) in RCA: 798] [Impact Index Per Article: 66.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
This report provides a review of early and late effects of radiation in normal tissues and organs with respect to radiation protection. It was instigated following a recommendation in Publication 103 (ICRP, 2007), and it provides updated estimates of 'practical' threshold doses for tissue injury defined at the level of 1% incidence. Estimates are given for morbidity and mortality endpoints in all organ systems following acute, fractionated, or chronic exposure. The organ systems comprise the haematopoietic, immune, reproductive, circulatory, respiratory, musculoskeletal, endocrine, and nervous systems; the digestive and urinary tracts; the skin; and the eye. Particular attention is paid to circulatory disease and cataracts because of recent evidence of higher incidences of injury than expected after lower doses; hence, threshold doses appear to be lower than previously considered. This is largely because of the increasing incidences with increasing times after exposure. In the context of protection, it is the threshold doses for very long follow-up times that are the most relevant for workers and the public; for example, the atomic bomb survivors with 40-50years of follow-up. Radiotherapy data generally apply for shorter follow-up times because of competing causes of death in cancer patients, and hence the risks of radiation-induced circulatory disease at those earlier times are lower. A variety of biological response modifiers have been used to help reduce late reactions in many tissues. These include antioxidants, radical scavengers, inhibitors of apoptosis, anti-inflammatory drugs, angiotensin-converting enzyme inhibitors, growth factors, and cytokines. In many cases, these give dose modification factors of 1.1-1.2, and in a few cases 1.5-2, indicating the potential for increasing threshold doses in known exposure cases. In contrast, there are agents that enhance radiation responses, notably other cytotoxic agents such as antimetabolites, alkylating agents, anti-angiogenic drugs, and antibiotics, as well as genetic and comorbidity factors. Most tissues show a sparing effect of dose fractionation, so that total doses for a given endpoint are higher if the dose is fractionated rather than when given as a single dose. However, for reactions manifesting very late after low total doses, particularly for cataracts and circulatory disease, it appears that the rate of dose delivery does not modify the low incidence. This implies that the injury in these cases and at these low dose levels is caused by single-hit irreparable-type events. For these two tissues, a threshold dose of 0.5Gy is proposed herein for practical purposes, irrespective of the rate of dose delivery, and future studies may elucidate this judgement further.
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Wang XC, Du LQ, Tian LL, Wu HL, Jiang XY, Zhang H, Li DG, Wang YY, Wu HY, She Y, Liu QF, Fan FY, Meng AM. Expression and function of miRNA in postoperative radiotherapy sensitive and resistant patients of non-small cell lung cancer. Lung Cancer 2010; 72:92-9. [PMID: 20728239 DOI: 10.1016/j.lungcan.2010.07.014] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2010] [Revised: 07/13/2010] [Accepted: 07/29/2010] [Indexed: 10/19/2022]
Abstract
PURPOSE To investigate the different miRNA expression profiles of postoperative radiotherapy sensitive and resistant patients of non-small cell lung cancer, explore their potential role and find some radio-sensitivity markers. MATERIALS AND METHODS Thirty non-small cell lung cancer patients who have been treated by postoperative radiotherapy were selected and were divided into radiotherapy sensitive group and resistant group according to overall survival and local or distant recurrence rate. Expression profile of miRNA in these two groups was detected by a microarray assay and the results were validated by quantitative RT-PCR and Northern blot. At the molecular level, the effect of one differently expressed miRNA (miR-126) on the growth and apoptosis of SK-MES-1 cells induced by irradiation was examined. RESULTS Comparing with resistant patients, five miRNAs (miRNA-126, miRNA-let-7a, miRNA-495, miRNA-451 and miRNA-128b) were significantly upregulated and seven miRNAs (miRNA-130a, miRNA-106b, miRNA-19b, miRNA-22, miRNA-15b, miRNA-17-5p and miRNA-21) were greatly downregulated in radiotherapy sensitive group. Overexpression of miRNA-126 inhibited the growth of SK-MES-1 cells and promoted its apoptosis induced by irradiation. The expression level of p-Akt decreased in miRNA-126 overexpression group. After treating with phosphoinositidyl-3 kinase (PI3K) constitutively activator (IGF-1) and inhibitor (LY294002), miRNA-126 overexpression had no significant effects on the apoptosis of SK-MES-1 cells. CONCLUSION We found 12 differently expressed miRNAs in the radiotherapy sensitive and resistant non-small cell lung cancer samples. Moreover, our results showed miRNA-126 promoted non-small cell lung cancer cells apoptosis induced by irradiation through the PI3K-Akt pathway.
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Affiliation(s)
- Xiao-Chun Wang
- Tianjin Key Laboratory of Molecular Nuclear Medicine, Institute of Radiation Medicine, Chinese Academy of Medical Science, Tianjin 300192, China
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Blakely EA, Kleiman NJ, Neriishi K, Chodick G, Chylack LT, Cucinotta FA, Minamoto A, Nakashima E, Kumagami T, Kitaoka T, Kanamoto T, Kiuchi Y, Chang P, Fujii N, Shore RE. Radiation cataractogenesis: epidemiology and biology. Radiat Res 2010; 173:709-17. [PMID: 20426671 DOI: 10.1667/rrxx19.1] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- E A Blakely
- Lawrence Berkeley National Laboratory, Berkeley, California, USA.
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Henderson MA, Valluri S, Garrett J, Lopez JT, Caperell-Grant A, Mendonca MS, Rusek A, Bigsby RM, Dynlacht JR. Effects of estrogen and gender on cataractogenesis induced by high-LET radiation. Radiat Res 2010; 173:191-6. [PMID: 20095851 DOI: 10.1667/rr1917.1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Planning for long-duration manned lunar and interplanetary missions requires an understanding of radiation-induced cataractogenesis. Previously, it was demonstrated that low-linear energy transfer (LET) irradiation with 10 Gy of (60)Co gamma rays resulted in an increased incidence of cataracts in male rats compared to female rats. This gender difference was not due to differences in estrogen, since male rats treated with the major secreted estrogen 17-beta-estradiol (E2) showed an identical increase compared to untreated males. We now compare the incidence and rate of progression of cataracts induced by high-LET radiation in male and female Sprague-Dawley rats. Rats received a single dose of 1 Gy of 600 MeV (56)Fe ions. Lens opacification was measured at 2-4-week intervals with a slit lamp. The incidence and rate of progression of radiation-induced cataracts was significantly increased in the animals in which estrogen was available from endogenous or exogenous sources. Male rats with E2 capsules implanted had significantly higher rates of progression compared to male rats with empty capsules implanted (P = 0.025) but not compared to the intact female rats. These results contrast with data obtained after low-LET irradiation and suggest the possibility that the different types of damage caused by high- and low-LET radiation may be influenced differentially by steroid sex hormones.
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Affiliation(s)
- Mark A Henderson
- Department of Radiation Oncology, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA
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Henderson MA, Valluri S, DesRosiers C, Lopez JT, Batuello CN, Caperell-Grant A, Mendonca MS, Powers EM, Bigsby RM, Dynlacht JR. Effect of Gender on Radiation-Induced Cataractogenesis. Radiat Res 2009; 172:129-33. [DOI: 10.1667/rr1589.1] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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