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Cope H, Elsborg J, Demharter S, McDonald JT, Wernecke C, Parthasarathy H, Unadkat H, Chatrathi M, Claudio J, Reinsch S, Avci P, Zwart SR, Smith SM, Heer M, Muratani M, Meydan C, Overbey E, Kim J, Chin CR, Park J, Schisler JC, Mason CE, Szewczyk NJ, Willis CRG, Salam A, Beheshti A. Transcriptomics analysis reveals molecular alterations underpinning spaceflight dermatology. COMMUNICATIONS MEDICINE 2024; 4:106. [PMID: 38862781 PMCID: PMC11166967 DOI: 10.1038/s43856-024-00532-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 05/23/2024] [Indexed: 06/13/2024] Open
Abstract
BACKGROUND Spaceflight poses a unique set of challenges to humans and the hostile spaceflight environment can induce a wide range of increased health risks, including dermatological issues. The biology driving the frequency of skin issues in astronauts is currently not well understood. METHODS To address this issue, we used a systems biology approach utilizing NASA's Open Science Data Repository (OSDR) on space flown murine transcriptomic datasets focused on the skin, biochemical profiles of 50 NASA astronauts and human transcriptomic datasets generated from blood and hair samples of JAXA astronauts, as well as blood samples obtained from the NASA Twins Study, and skin and blood samples from the first civilian commercial mission, Inspiration4. RESULTS Key biological changes related to skin health, DNA damage & repair, and mitochondrial dysregulation are identified as potential drivers for skin health risks during spaceflight. Additionally, a machine learning model is utilized to determine gene pairings associated with spaceflight response in the skin. While we identified spaceflight-induced dysregulation, such as alterations in genes associated with skin barrier function and collagen formation, our results also highlight the remarkable ability for organisms to re-adapt back to Earth via post-flight re-tuning of gene expression. CONCLUSION Our findings can guide future research on developing countermeasures for mitigating spaceflight-associated skin damage.
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Affiliation(s)
- Henry Cope
- School of Medicine, University of Nottingham, Derby, DE22 3DT, UK
| | - Jonas Elsborg
- Department of Energy Conversion and Storage, Technical University of Denmark, 2800, Kongens Lyngby, Denmark
- Abzu, Copenhagen, 2150, Denmark
| | | | - J Tyson McDonald
- Department of Radiation Medicine, School of Medicine, Georgetown University, Washington D.C., WA, 20057, USA
| | - Chiara Wernecke
- NASA GeneLab For High Schools Program (GL4HS), Space Biology Program, NASA Ames Research Center, Moffett Field, CA, USA
- Department of Aerospace and Geodesy, TUM School of Engineering and Design, Technical University of Munich, Munich, Germany
| | - Hari Parthasarathy
- NASA GeneLab For High Schools Program (GL4HS), Space Biology Program, NASA Ames Research Center, Moffett Field, CA, USA
- College of Engineering and Haas School of Business, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Hriday Unadkat
- NASA GeneLab For High Schools Program (GL4HS), Space Biology Program, NASA Ames Research Center, Moffett Field, CA, USA
- School of Engineering and Applied Science, Princeton University, Princeton, NJ, 08540, USA
| | - Mira Chatrathi
- NASA GeneLab For High Schools Program (GL4HS), Space Biology Program, NASA Ames Research Center, Moffett Field, CA, USA
- College of Letters and Science, University of California, Berkeley, Berkeley, CA, 94720, USA
| | - Jennifer Claudio
- NASA GeneLab For High Schools Program (GL4HS), Space Biology Program, NASA Ames Research Center, Moffett Field, CA, USA
- Blue Marble Space Institute of Science, Space Biosciences Division, NASA Ames Research Center, Moffett field, CA, USA
| | - Sigrid Reinsch
- NASA GeneLab For High Schools Program (GL4HS), Space Biology Program, NASA Ames Research Center, Moffett Field, CA, USA
- Space Biosciences Division, NASA Ames Research Center, Moffett field, CA, USA
| | - Pinar Avci
- Department of Dermatology and Allergy, University Hospital, LMU Munich, 80337, Munich, Germany
| | - Sara R Zwart
- University of Texas Medical Branch, Galveston, TX, USA
| | - Scott M Smith
- Biomedical Research and Environmental Sciences Division, Human Health and Performance Directorate, NASA Johnson Space Center, Houston, TX, 77058, USA
| | - Martina Heer
- IU International University of Applied Sciences, Erfurt and University of Bonn, Bonn, Germany
| | - Masafumi Muratani
- Transborder Medical Research Center, University of Tsukuba, Ibaraki, 305-8575, Japan
- Department of Genome Biology, Institute of Medicine, University of Tsukuba, Ibaraki, 305-8575, Japan
| | - Cem Meydan
- Department of Physiology, Biophysics and Systems Biology, Weill Cornell Medicine, New York, NY, USA
| | - Eliah Overbey
- Department of Physiology, Biophysics and Systems Biology, Weill Cornell Medicine, New York, NY, USA
| | - Jangkeun Kim
- Department of Physiology, Biophysics and Systems Biology, Weill Cornell Medicine, New York, NY, USA
| | - Christopher R Chin
- Department of Physiology, Biophysics and Systems Biology, Weill Cornell Medicine, New York, NY, USA
| | - Jiwoon Park
- Department of Physiology, Biophysics and Systems Biology, Weill Cornell Medicine, New York, NY, USA
- Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, NY, 10065, USA
| | - Jonathan C Schisler
- McAllister Heart Institute and Department of Pharmacology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Christopher E Mason
- Department of Physiology, Biophysics and Systems Biology, Weill Cornell Medicine, New York, NY, USA
- Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, NY, 10065, USA
| | - Nathaniel J Szewczyk
- School of Medicine, University of Nottingham, Derby, DE22 3DT, UK
- Ohio Musculoskeletal and Neurological Institute, Heritage College of Osteopathic Medicine, Ohio University, Athens, OH, 45701, USA
| | - Craig R G Willis
- School of Chemistry and Biosciences, Faculty of Life Sciences, University of Bradford, Bradford, BD7 1DP, UK
| | - Amr Salam
- St John's Institute of Dermatology, King's College London, Guy's and St Thomas' NHS Foundation Trust, Guy's Hospital, Great Maze Pond, London, SE1 9RT, UK
| | - Afshin Beheshti
- Blue Marble Space Institute of Science, Space Biosciences Division, NASA Ames Research Center, Moffett field, CA, USA.
- Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, MA, USA.
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Albores-Mendez EM, Casanas-Pimentel RG, Reyes-Chacon IR, Maldonado Cubas J, Lopez-Cruz J, Rincon-Huerta JA, Camacho-Ibarra A, San Martin-Martinez E. Cancer Progression Is not Different in Mice of Different Gender Inoculated With Cells of the Triple-Negative 4T1 Breast Cancer Model. World J Oncol 2022; 13:249-258. [PMID: 36406197 PMCID: PMC9635788 DOI: 10.14740/wjon1517] [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: 07/24/2022] [Accepted: 08/15/2022] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND Breast cancer in men is a rare and poorly studied disease, and its treatment is based on women breast cancer studies. However, clinical outcome is not the same in men and women. Basic studies and clinical trials in animal models provide detailed information on cancer, origin, development, cell signaling pathways, sites of metastasis, and target molecules. It is necessary to explore the biology of breast cancer in male animal models that allow observing their similarity. METHODS The triple-negative 4T1 breast cancer model was developed in both male and female mice and studied weekly during 4 weeks. For that, twenty 8-week-old female and male BALB/c mice were used. Sixteen mice (eight males and eight females) were inoculated into the second left thoracic mammary pad with 20,000 4T1 cells, resuspended in 20 µL phosphate-buffered saline (PBS). All samples were processed for immunodetection, characterized histopathologically and immunohistochemically. RESULTS In this work, we describe the development of a triple-negative 4T1 breast cancer model in male BALB/c mice. Breast tumors were characterized histopathologically at different time points and corresponded to a moderately differentiated invasive ductal carcinoma, estrogen receptor ER-/progesterone receptor PR-/human epidermal growth factor receptor 2 HER2-/Ki67+, with histological grade II (moderately differentiated; a solid mass with occasional duct formation and moderate to severe nuclear pleomorphism), infiltrating the adipose and muscular tissue, and metastasis to lungs. From the results, we did not observe differences in the time of tumor development, necrosis, color change of tumor tissue, and lung metastasis between male and female mice. Even though we did not find histological differences, response to treatment and molecular signaling may be different. CONCLUSIONS The histogenesis of male breast tumors was similar to that of female BALB/c mice. The histological and immunohistochemical characteristics of male tumors also match the features reported for stage IV human breast cancer of men and women. The murine male breast cancer model described here can be a significant tool to explore the molecular mechanisms involved in male breast cancer tumorigenesis and metastasis and may bring new approaches for clinical treatment of triple-negative breast cancer in men.
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Affiliation(s)
- Exsal Manuel Albores-Mendez
- CE.MI.C.SA. - Escuela Militar de Graduados de Sanidad, Universidad del Ejercito y Fuerza Aerea, Batalla de Celaya 202, Lomas de Sotelo, Ciudad de Mexico, C.P. 11200, Mexico,Instituto Politecnico Nacional, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Unidad Legaria, Calzada Legaria 694, Irrigacion, Miguel Hidalgo, Ciudad de Mexico, C.P. 11500, Mexico
| | - Rocio Guadalupe Casanas-Pimentel
- Instituto Politecnico Nacional, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Unidad Legaria, Calzada Legaria 694, Irrigacion, Miguel Hidalgo, Ciudad de Mexico, C.P. 11500, Mexico
| | - Indira Raquel Reyes-Chacon
- Centro de Estudios Navales en Ciencias de la Salud, Coapa, Ex-Ejido de San Pablo Tepetlapa, Ciudad de Mexico, C.P. 04800, Mexico
| | - Juan Maldonado Cubas
- Universidad La Salle, Grupo de Investigacion en Procesamiento Digital de Senales Biomedicas, Vicerrectoria de Investigacion, Benjamin Franklin 45, Condesa, Cuauhtemoc, Ciudad de Mexico, C.P. 06140, Mexico
| | - Jaime Lopez-Cruz
- CE.MI.C.SA. - Escuela Militar de Graduados de Sanidad, Universidad del Ejercito y Fuerza Aerea, Batalla de Celaya 202, Lomas de Sotelo, Ciudad de Mexico, C.P. 11200, Mexico
| | - Jorge Alberto Rincon-Huerta
- Centro de Estudios Navales en Ciencias de la Salud, Coapa, Ex-Ejido de San Pablo Tepetlapa, Ciudad de Mexico, C.P. 04800, Mexico
| | - Alejandro Camacho-Ibarra
- CE.MI.C.SA. - Escuela Militar de Graduados de Sanidad, Universidad del Ejercito y Fuerza Aerea, Batalla de Celaya 202, Lomas de Sotelo, Ciudad de Mexico, C.P. 11200, Mexico
| | - Eduardo San Martin-Martinez
- Instituto Politecnico Nacional, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Unidad Legaria, Calzada Legaria 694, Irrigacion, Miguel Hidalgo, Ciudad de Mexico, C.P. 11500, Mexico,Corresponding Author: Eduardo San Martin-Martinez, Instituto Politecnico Nacional, Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Unidad Legaria, Calzada Legaria 694, Irrigacion, Miguel Hidalgo, Ciudad de Mexico, C.P. 11500, Mexico.
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Gao F, Yang Y, Zhu H, Wang J, Xiao D, Zhou Z, Dai T, Zhang Y, Feng G, Li J, Lin B, Xie G, Ke Q, Zhou K, Li P, Shen X, Wang H, Yan L, Lao C, Shan L, Li M, Lu Y, Chen M, Feng S, Zhao J, Wu D, Du X. First demonstration of the FLASH effect with ultrahigh dose rate high-energy X-rays. Radiother Oncol 2021; 166:44-50. [PMID: 34774651 DOI: 10.1016/j.radonc.2021.11.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 10/02/2021] [Accepted: 11/01/2021] [Indexed: 12/12/2022]
Abstract
PURPOSE This study aimed to evaluate whether high-energy X-rays (HEXs) of the PARTER (platform for advanced radiotherapy research) platform built on CTFEL (Chengdu THz Free Electron Laser facility) can produce ultrahigh dose rate (FLASH) X-rays and trigger the FLASH effect. MATERIALS AND METHODS EBT3 radiochromic film and fast current transformer (FCT) devices were used to measure absolute dose and pulsed beam current of HEXs. Subcutaneous tumor-bearing mice and healthy mice were treated with sham, FLASH, and conventional dose rate radiotherapy (CONV), respectively to observe the tumor control efficiency and normal tissue damage. RESULTS The maximum dose rate of HEXs of PARTER was up to over 1000 Gy/s. Tumor-bearing mice experiment showed a good result on tumor control (p < 0.0001) and significant difference in survival curves (p < 0.005) among the three groups. In the thorax-irradiated healthy mice experiment, there was a significant difference (p = 0.038) in survival among the three groups, with the risk of death decreased by 81% in the FLASH group compared to that in the CONV group. The survival time of healthy mice irradiated in the abdomen in the FLASH group was undoubtedly higher (62.5% of mice were still alive when we stopped observation) than that in the CONV group (7 days). CONCLUSION This study confirmed that HEXs of the PARTER system can produce ultrahigh dose rate X-rays and trigger a FLASH effect, which provides a basis for future scientific research and clinical application of HEX in FLASH radiotherapy.
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Affiliation(s)
- Feng Gao
- Departmant of Oncology, Nuclear Medicine Laboratory of Mianyang Central Hospital, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang, China
| | - Yiwei Yang
- Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, China
| | - Hongyu Zhu
- Department of Radiation Oncology, Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, China
| | - Jianxin Wang
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Dexin Xiao
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Zheng Zhou
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Tangzhi Dai
- Departmant of Oncology, Nuclear Medicine Laboratory of Mianyang Central Hospital, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang, China
| | - Yu Zhang
- Departmant of Oncology, Nuclear Medicine Laboratory of Mianyang Central Hospital, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang, China
| | - Gang Feng
- Departmant of Oncology, Nuclear Medicine Laboratory of Mianyang Central Hospital, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang, China
| | - Jie Li
- Departmant of Oncology, Nuclear Medicine Laboratory of Mianyang Central Hospital, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang, China
| | - Binwei Lin
- Departmant of Oncology, Nuclear Medicine Laboratory of Mianyang Central Hospital, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang, China
| | - Gang Xie
- Department of Pathology, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang, China
| | - Qi Ke
- Department of Pathology, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang, China
| | - Kui Zhou
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Peng Li
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Xuming Shen
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Hanbin Wang
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Longgang Yan
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Chenglong Lao
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Lijun Shan
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Ming Li
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Yanhua Lu
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Menxue Chen
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Song Feng
- School of Nuclear Science and Technology, University of South China, Hengyang, China
| | - Jianheng Zhao
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China
| | - Dai Wu
- Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, China.
| | - Xiaobo Du
- Departmant of Oncology, Nuclear Medicine Laboratory of Mianyang Central Hospital, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang, China.
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Radaelli E, Santagostino SF, Sellers RS, Brayton CF. Immune Relevant and Immune Deficient Mice: Options and Opportunities in Translational Research. ILAR J 2019; 59:211-246. [PMID: 31197363 PMCID: PMC7114723 DOI: 10.1093/ilar/ily026] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 12/03/2018] [Indexed: 12/29/2022] Open
Abstract
In 1989 ILAR published a list and description of immunodeficient rodents used in research. Since then, advances in understanding of molecular mechanisms; recognition of genetic, epigenetic microbial, and other influences on immunity; and capabilities in manipulating genomes and microbiomes have increased options and opportunities for selecting mice and designing studies to answer important mechanistic and therapeutic questions. Despite numerous scientific breakthroughs that have benefitted from research in mice, there is debate about the relevance and predictive or translational value of research in mice. Reproducibility of results obtained from mice and other research models also is a well-publicized concern. This review summarizes resources to inform the selection and use of immune relevant mouse strains and stocks, aiming to improve the utility, validity, and reproducibility of research in mice. Immune sufficient genetic variations, immune relevant spontaneous mutations, immunodeficient and autoimmune phenotypes, and selected induced conditions are emphasized.
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Affiliation(s)
- Enrico Radaelli
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Sara F Santagostino
- Department of Safety Assessment, Genentech, Inc., South San Francisco, California
| | | | - Cory F Brayton
- Molecular and Comparative Pathobiology, Johns Hopkins University School of Medicine, Baltimore, Maryland
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Cruz-Vallejo V, Ortíz-Muñiz R, Vallarino-Kelly T, Cervantes-Ríos E, Morales-Ramírez P. In vivo Characterization of the Radiosensitizing Effect of a Very Low Dose of BrdU in Murine Cells Exposed to Low-Dose Radiation. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 2019; 60:534-545. [PMID: 30851126 DOI: 10.1002/em.22284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 02/24/2019] [Accepted: 03/02/2019] [Indexed: 06/09/2023]
Abstract
The aim of the present study was to characterize the in vivo radiosensitizing effect of a very low dose of bromodeoxyuridine (BrdU) in mice exposed to low-dose radiation by establishing the following: (1) the radiosensitizing effect during DNA synthesis using single-cell gel electrophoresis (SCGE) in murine bone marrow cells, and (2) the number and timing of the mechanisms of genotoxicity and cytotoxicity, as well as the correlation of both end points, using flow cytometry analysis of the kinetics of micronucleus induction in reticulocytes. Groups of mice received intraperitoneal injections of 0.125 mg/g of BrdU 24 h prior to irradiation with 0.5 Gy of 60 Co gamma rays. DNA breaks measured using SCGE were determined at 30 min after exposure to radiation. The kinetics of micronucleated reticulocyte (MN-RET) induction was determined every 8 h after irradiation up to 72 h. The results from both experimental models indicated that low-level BrdU incorporation into DNA increased the sensitivity to 0.5 Gy of radiation, particularly in the S phase. The formation of micronuclei by gamma rays was produced at three different times using two main mechanisms. In the BrdU-substituted cells, the second mechanism was associated with a high cytotoxic effect that was absent in the irradiated BrdU-unsubstituted cells. The third mechanism, in which micronucleus formation was increased in irradiated substituted cells compared with the irradiated nonsubstituted control cells, was also related to an increase in cytotoxicity. Environ. Mol. Mutagen. 60:534-545, 2019. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Virginia Cruz-Vallejo
- Instituto Nacional de Investigaciones Nucleares, Carretera México-Toluca s/n, La Marquesa, Ocoyoacac, Estado de México C. P., 52750, Mexico
- Doctorado en Biología Experimental, Universidad Autónoma Metropolitana, Avenida San Rafael Atlixco 186 CP, 09340, Ciudad de México, Mexico
| | - Rocío Ortíz-Muñiz
- Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Avenida San Rafael Atlixco 186 CP, 09340, Ciudad de México, Mexico
| | - Teresita Vallarino-Kelly
- Instituto Nacional de Investigaciones Nucleares, Carretera México-Toluca s/n, La Marquesa, Ocoyoacac, Estado de México C. P., 52750, Mexico
| | - Elsa Cervantes-Ríos
- Departamento de Ciencias de la Salud, Universidad Autónoma Metropolitana-Iztapalapa, Avenida San Rafael Atlixco 186 CP, 09340, Ciudad de México, Mexico
| | - Pedro Morales-Ramírez
- Instituto Nacional de Investigaciones Nucleares, Carretera México-Toluca s/n, La Marquesa, Ocoyoacac, Estado de México C. P., 52750, Mexico
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Barnard SGR, Moquet J, Lloyd S, Ellender M, Ainsbury EA, Quinlan RA. Dotting the eyes: mouse strain dependency of the lens epithelium to low dose radiation-induced DNA damage. Int J Radiat Biol 2018; 94:1116-1124. [PMID: 30359158 DOI: 10.1080/09553002.2018.1532609] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
PURPOSE Epidemiological evidence regarding the radiosensitivity of the lens of the eye and radiation cataract development has led to changes in the EU Basic Safety Standards for protection of the lens against ionizing radiation. However, mechanistic details of lens radiation response pathways and their significance for cataractogenesis remain unclear. Radiation-induced DNA damage and the potential impairment of repair pathways within the lens epithelium, a cell monolayer that covers the anterior hemisphere of the lens, are likely to be involved. MATERIALS AND METHODS In this work, the lens epithelium has been analyzed for its DNA double-strand break (DSB) repair response to ionizing radiation. The responses of epithelial cells located at the anterior pole (central region) have been compared to at the very periphery of the monolayer (germinative and transitional zones). Described here are the different responses in the two regions and across four strains (C57BL/6, 129S2, BALB/c and CBA/Ca) over a low dose (0-25 mGy) in-vivo whole body X-irradiation range up to 24 hours post exposure. RESULTS DNA damage and repair as visualized through 53BP1 staining was present across the lens epithelium, although repair kinetics appeared non-uniform. Epithelial cells in the central region have significantly more 53BP1 foci. The sensitivities of different mouse strains have also been compared. CONCLUSIONS 129S2 and BALB/c showed higher levels of DNA damage, with BALB/c showing significantly less inter-individual variability and appearing to be a more robust model for future DNA damage and repair studies. As a result of this study, BALB/c was identified as a suitable radiosensitive lens strain to detect and quantify early low dose ionizing radiation DNA damage effects in the mouse eye lens specifically, as an indicator of cataract formation.
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Affiliation(s)
- S G R Barnard
- a Centre for Radiation, Chemical and Environmental Hazards , Public Health England , Chilton , Oxon, UK.,b Department of Biosciences , Durham University , Durham , UK
| | - J Moquet
- a Centre for Radiation, Chemical and Environmental Hazards , Public Health England , Chilton , Oxon, UK
| | - S Lloyd
- a Centre for Radiation, Chemical and Environmental Hazards , Public Health England , Chilton , Oxon, UK.,c School of Biosciences , The University of Birmingham , Edgbaston , UK
| | - M Ellender
- a Centre for Radiation, Chemical and Environmental Hazards , Public Health England , Chilton , Oxon, UK
| | - E A Ainsbury
- a Centre for Radiation, Chemical and Environmental Hazards , Public Health England , Chilton , Oxon, UK
| | - R A Quinlan
- b Department of Biosciences , Durham University , Durham , UK
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