51
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Edmondson EF, Gatti DM, Ray FA, Garcia EL, Fallgren CM, Kamstock DA, Weil MM. Genomic mapping in outbred mice reveals overlap in genetic susceptibility for HZE ion- and γ-ray-induced tumors. SCIENCE ADVANCES 2020; 6:eaax5940. [PMID: 32494593 PMCID: PMC7159905 DOI: 10.1126/sciadv.aax5940] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 01/14/2020] [Indexed: 05/02/2023]
Abstract
Cancer risk from galactic cosmic radiation exposure is considered a potential "showstopper" for a manned mission to Mars. Calculating the actual risks confronted by spaceflight crews is complicated by our limited understanding of the carcinogenic effects of high-charge, high-energy (HZE) ions, a radiation type for which no human exposure data exist. Using a mouse model of genetic diversity, we find that the histotype spectrum of HZE ion-induced tumors is similar to the spectra of spontaneous and γ-ray-induced tumors and that the genomic loci controlling susceptibilities overlap between groups for some tumor types. Where it occurs, this overlap indicates shared tumorigenesis mechanisms regardless of the type of radiation exposure and supports the use of human epidemiological data from γ-ray exposures to predict cancer risks from galactic cosmic rays.
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Affiliation(s)
- E. F. Edmondson
- Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA
- Colorado State University, Fort Collins, CO 80523, USA
| | - D. M. Gatti
- The Jackson Laboratory, Bar Harbor, ME 04609, USA
| | - F. A. Ray
- Colorado State University, Fort Collins, CO 80523, USA
| | - E. L. Garcia
- Colorado State University, Fort Collins, CO 80523, USA
| | | | | | - M. M. Weil
- Colorado State University, Fort Collins, CO 80523, USA
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52
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Santa Maria SR, Marina DB, Massaro Tieze S, Liddell LC, Bhattacharya S. BioSentinel: Long-Term Saccharomyces cerevisiae Preservation for a Deep Space Biosensor Mission. ASTROBIOLOGY 2020; 23:617-630. [PMID: 31905002 DOI: 10.1089/ast.2019.2073] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The biological risks of the deep space environment must be elucidated to enable a new era of human exploration and scientific discovery beyond low earth orbit (LEO). There is a paucity of deep space biological missions that will inform us of the deleterious biological effects of prolonged exposure to the deep space environment. To safely undertake long-term missions to Mars and space habitation beyond LEO, we must first prove and optimize autonomous biosensors to query the deep space radiation environment. Such biosensors must contain organisms that can survive for extended periods with minimal life support technology and must function reliably with intermittent communication with Earth. NASA's BioSentinel mission, a nanosatellite containing the budding yeast Saccharomyces cerevisiae, is such a biosensor and one of the first biological missions beyond LEO in nearly half a century. It will help fill critical gaps in knowledge about the effects of uniquely composed, chronic, low-flux deep space radiation on biological systems and in particular will provide valuable insight into the DNA damage response to highly ionizing particles. Due to yeast's robustness and desiccation tolerance, it can survive for periods analogous to that of a human Mars mission. In this study, we discuss our optimization of conditions for long-term reagent storage and yeast survival under desiccation in preparation for the BioSentinel mission. We show that long-term yeast cell viability is maximized when cells are air-dried in trehalose solution and stored in a low-relative humidity and low-temperature environment and that dried yeast is sensitive to low doses of deep space-relevant ionizing radiation under these conditions. Our findings will inform the design and development of improved future long-term biological missions into deep space.
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Affiliation(s)
- Sergio R Santa Maria
- COSMIAC Research Center, University of New Mexico, Albuquerque, New Mexico
- Space Biosciences Research, NASA Ames Research Center, Moffett Field, California
| | - Diana B Marina
- Space Biosciences Research, NASA Ames Research Center, Moffett Field, California
- Amyris, Inc., Emeryville, California (present address)
| | - Sofia Massaro Tieze
- Space Biosciences Research, NASA Ames Research Center, Moffett Field, California
- Blue Marble Space Institute of Science, Seattle, Washington
| | - Lauren C Liddell
- Space Biosciences Research, NASA Ames Research Center, Moffett Field, California
- Logyx LLC, Mountain View, California
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53
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Expression Profile of Cell Cycle-Related Genes in Human Fibroblasts Exposed Simultaneously to Radiation and Simulated Microgravity. Int J Mol Sci 2019; 20:ijms20194791. [PMID: 31561588 PMCID: PMC6801845 DOI: 10.3390/ijms20194791] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 09/16/2019] [Accepted: 09/24/2019] [Indexed: 01/05/2023] Open
Abstract
Multiple unique environmental factors such as space radiation and microgravity (μG) pose a serious threat to human gene stability during space travel. Recently, we reported that simultaneous exposure of human fibroblasts to simulated μG and radiation results in more chromosomal aberrations than in cells exposed to radiation alone. However, the mechanisms behind this remain unknown. The purpose of this study was thus to obtain comprehensive data on gene expression using a three-dimensional clinostat synchronized to a carbon (C)-ion or X-ray irradiation system. Human fibroblasts (1BR-hTERT) were maintained under standing or rotating conditions for 3 or 24 h after synchronized C-ion or X-ray irradiation at 1 Gy as part of a total culture time of 2 days. Among 57,773 genes analyzed with RNA sequencing, we focused particularly on the expression of 82 cell cycle-related genes after exposure to the radiation and simulated μG. The expression of cell cycle-suppressing genes (ABL1 and CDKN1A) decreased and that of cell cycle-promoting genes (CCNB1, CCND1, KPNA2, MCM4, MKI67, and STMN1) increased after C-ion irradiation under μG. The cell may pass through the G1/S and G2 checkpoints with DNA damage due to the combined effects of C-ions and μG, suggesting that increased genomic instability might occur in space.
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54
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Hada M, Saganti PB, Cucinotta FA. Nitric Oxide Is Involved in Heavy Ion-Induced Non-Targeted Effects in Human Fibroblasts. Int J Mol Sci 2019; 20:ijms20184327. [PMID: 31487843 PMCID: PMC6769611 DOI: 10.3390/ijms20184327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 08/19/2019] [Accepted: 08/30/2019] [Indexed: 11/16/2022] Open
Abstract
Previously, we investigated the dose response for chromosomal aberration (CA) for exposures corresponding to less than one particle traversal per cell nucleus by high energy and charge (HZE) particles, and showed that the dose responses for simple exchanges for human fibroblast irradiated under confluent culture conditions were best fit by non-linear models motivated by a non-targeted effect (NTE). Our results suggested that the simple exchanges in normal human fibroblasts have an important NTE contribution at low particle fluence. Nitric oxide (NO) has been reported as a candidate for intercellular signaling for NTE in many studies. In order to estimate the contribution of NTE components in induced CA, we measured CA with and without an NO scavenger in normal skin fibroblasts cells after exposure to 600 MeV/u and 1 GeV/u 56Fe ions, less than one direct particle traversal per cell nucleus. Yields of CA were significantly lower in fibroblasts exposed to the NO scavenger compared to controls, suggesting involvement of NO in cell signaling for induction of CA. Media transferred from irradiated cells induced CA in non-irradiated cells, and this effect was abrogated with NO scavengers. Our results strongly support the importance of NTE contributions in the formation of CA at low-particle fluence in fibroblasts.
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Affiliation(s)
- Megumi Hada
- Chancellor's Research Initiative, Radiation Institute for Science & Engineering, Prairie View A&M University, Prairie View, TX 77446, USA.
| | - Premkumar B Saganti
- Chancellor's Research Initiative, Radiation Institute for Science & Engineering, Prairie View A&M University, Prairie View, TX 77446, USA
| | - Francis A Cucinotta
- Department of Health Physics and Diagnostic Sciences, University of Nevada Las Vegas, Las Vegas, NV 89154, USA
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55
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Acharya MM, Baulch JE, Klein PM, Baddour AAD, Apodaca LA, Kramár EA, Alikhani L, Garcia C, Angulo MC, Batra RS, Fallgren CM, Borak TB, Stark CEL, Wood MA, Britten RA, Soltesz I, Limoli CL. New Concerns for Neurocognitive Function during Deep Space Exposures to Chronic, Low Dose-Rate, Neutron Radiation. eNeuro 2019; 6:ENEURO.0094-19.2019. [PMID: 31383727 PMCID: PMC6709229 DOI: 10.1523/eneuro.0094-19.2019] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 07/08/2019] [Accepted: 07/16/2019] [Indexed: 12/12/2022] Open
Abstract
As NASA prepares for a mission to Mars, concerns regarding the health risks associated with deep space radiation exposure have emerged. Until now, the impacts of such exposures have only been studied in animals after acute exposures, using dose rates ∼1.5×105 higher than those actually encountered in space. Using a new, low dose-rate neutron irradiation facility, we have uncovered that realistic, low dose-rate exposures produce serious neurocognitive complications associated with impaired neurotransmission. Chronic (6 month) low-dose (18 cGy) and dose rate (1 mGy/d) exposures of mice to a mixed field of neutrons and photons result in diminished hippocampal neuronal excitability and disrupted hippocampal and cortical long-term potentiation. Furthermore, mice displayed severe impairments in learning and memory, and the emergence of distress behaviors. Behavioral analyses showed an alarming increase in risk associated with these realistic simulations, revealing for the first time, some unexpected potential problems associated with deep space travel on all levels of neurological function.
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Affiliation(s)
- Munjal M Acharya
- Department of Radiation Oncology, University of California, Irvine, California 92697
| | - Janet E Baulch
- Department of Radiation Oncology, University of California, Irvine, California 92697
| | - Peter M Klein
- Department of Neurosurgery, Stanford University, California 94305
| | - Al Anoud D Baddour
- Department of Radiation Oncology, University of California, Irvine, California 92697
| | - Lauren A Apodaca
- Department of Radiation Oncology, University of California, Irvine, California 92697
| | - Eniko A Kramár
- Department of Neurobiology and Behavior, University of California, Irvine, California 92697
| | - Leila Alikhani
- Department of Radiation Oncology, University of California, Irvine, California 92697
| | - Camillo Garcia
- Department of Radiation Oncology, University of California, Irvine, California 92697
| | - Maria C Angulo
- Department of Radiation Oncology, University of California, Irvine, California 92697
| | - Raja S Batra
- Department of Radiation Oncology, University of California, Irvine, California 92697
| | - Christine M Fallgren
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado 80523
| | - Thomas B Borak
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado 80523
| | - Craig E L Stark
- Department of Neurobiology and Behavior, University of California, Irvine, California 92697
| | - Marcello A Wood
- Department of Neurobiology and Behavior, University of California, Irvine, California 92697
| | - Richard A Britten
- Department of Radiation Oncology, Eastern Virginia Medical School, Norfolk, Virginia 23507
| | - Ivan Soltesz
- Department of Neurosurgery, Stanford University, California 94305
| | - Charles L Limoli
- Department of Radiation Oncology, University of California, Irvine, California 92697
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56
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Cacao E, Cucinotta FA. Meta-analysis of Cognitive Performance by Novel Object Recognition after Proton and Heavy Ion Exposures. Radiat Res 2019; 192:463-472. [PMID: 31415222 DOI: 10.1667/rr15419.1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Experimental studies of cognitive detriments in mice and rats after proton and heavy ion exposures have been performed by several laboratories to investigate possible risks to astronauts exposed to cosmic rays in space travel and patients treated for brain cancers with proton and carbon beams in Hadron therapy. However, distinct radiation types and doses, cognitive tests and rodent models have been used by different laboratories, while few studies have considered detailed dose-response characterizations, including estimates of relative biological effectiveness (RBE). Here we report on the first quantitative meta-analysis of the dose response for proton and heavy ion rodent studies of the widely used novel object recognition (NOR) test, which estimates detriments in recognition or object memory. Our study reveals that linear or linear-quadratic dose-response models of relative risk (RR) do not provide accurate descriptions. However, good descriptions for doses up to 1 Gy are provided by exponentially increasing fluence or dose-response models observed with an LET dependence similar to a classical radiation quality response, which peaks near 100-120 keV/µm and declines at higher LET values. Exponential models provide accurate predictions of experimental results for NOR in mice after mixed-beam exposures of protons and 56Fe, and protons, 16O and 28Si. RBE estimates are limited by available X-ray or gamma-ray experiments to serve as a reference radiation. RBE estimates based on use of data from combined gamma-ray and high-energy protons of low-LET experiments suggest modest RBEs, with values <8 for most heavy ions, while higher values <20 are based on limited gamma-ray data. In addition, we consider a log-normal model for the variation of subject responses at defined dose levels. The log-normal model predicts a heavy ion dose threshold of approximately 0.01 Gy for NOR-related cognitive detriments.
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Affiliation(s)
- Eliedonna Cacao
- Department of Health Physics and Diagnostic Sciences, University of Nevada, Las Vegas, Nevada
| | - Francis A Cucinotta
- Department of Health Physics and Diagnostic Sciences, University of Nevada, Las Vegas, Nevada
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57
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Garrett-Bakelman FE, Darshi M, Green SJ, Gur RC, Lin L, Macias BR, McKenna MJ, Meydan C, Mishra T, Nasrini J, Piening BD, Rizzardi LF, Sharma K, Siamwala JH, Taylor L, Vitaterna MH, Afkarian M, Afshinnekoo E, Ahadi S, Ambati A, Arya M, Bezdan D, Callahan CM, Chen S, Choi AMK, Chlipala GE, Contrepois K, Covington M, Crucian BE, De Vivo I, Dinges DF, Ebert DJ, Feinberg JI, Gandara JA, George KA, Goutsias J, Grills GS, Hargens AR, Heer M, Hillary RP, Hoofnagle AN, Hook VYH, Jenkinson G, Jiang P, Keshavarzian A, Laurie SS, Lee-McMullen B, Lumpkins SB, MacKay M, Maienschein-Cline MG, Melnick AM, Moore TM, Nakahira K, Patel HH, Pietrzyk R, Rao V, Saito R, Salins DN, Schilling JM, Sears DD, Sheridan CK, Stenger MB, Tryggvadottir R, Urban AE, Vaisar T, Van Espen B, Zhang J, Ziegler MG, Zwart SR, Charles JB, Kundrot CE, Scott GBI, Bailey SM, Basner M, Feinberg AP, Lee SMC, Mason CE, Mignot E, Rana BK, Smith SM, Snyder MP, Turek FW. The NASA Twins Study: A multidimensional analysis of a year-long human spaceflight. Science 2019; 364:364/6436/eaau8650. [PMID: 30975860 DOI: 10.1126/science.aau8650] [Citation(s) in RCA: 423] [Impact Index Per Article: 84.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Accepted: 02/28/2019] [Indexed: 12/11/2022]
Abstract
To understand the health impact of long-duration spaceflight, one identical twin astronaut was monitored before, during, and after a 1-year mission onboard the International Space Station; his twin served as a genetically matched ground control. Longitudinal assessments identified spaceflight-specific changes, including decreased body mass, telomere elongation, genome instability, carotid artery distension and increased intima-media thickness, altered ocular structure, transcriptional and metabolic changes, DNA methylation changes in immune and oxidative stress-related pathways, gastrointestinal microbiota alterations, and some cognitive decline postflight. Although average telomere length, global gene expression, and microbiome changes returned to near preflight levels within 6 months after return to Earth, increased numbers of short telomeres were observed and expression of some genes was still disrupted. These multiomic, molecular, physiological, and behavioral datasets provide a valuable roadmap of the putative health risks for future human spaceflight.
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Affiliation(s)
- Francine E Garrett-Bakelman
- Weill Cornell Medicine, New York, NY, USA.,University of Virginia School of Medicine, Charlottesville, VA, USA
| | - Manjula Darshi
- Center for Renal Precision Medicine, University of Texas Health, San Antonio, TX, USA
| | | | - Ruben C Gur
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Ling Lin
- Stanford University School of Medicine, Palo Alto, CA, USA
| | | | | | - Cem Meydan
- Weill Cornell Medicine, New York, NY, USA.,The Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, New York, NY, USA
| | | | - Jad Nasrini
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | | | | | - Kumar Sharma
- Center for Renal Precision Medicine, University of Texas Health, San Antonio, TX, USA
| | | | - Lynn Taylor
- Colorado State University, Fort Collins, CO, USA
| | | | | | - Ebrahim Afshinnekoo
- Weill Cornell Medicine, New York, NY, USA.,The Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, New York, NY, USA
| | - Sara Ahadi
- Stanford University School of Medicine, Palo Alto, CA, USA
| | - Aditya Ambati
- Stanford University School of Medicine, Palo Alto, CA, USA
| | | | - Daniela Bezdan
- Weill Cornell Medicine, New York, NY, USA.,The Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, New York, NY, USA
| | | | - Songjie Chen
- Stanford University School of Medicine, Palo Alto, CA, USA
| | | | | | | | - Marisa Covington
- National Aeronautics and Space Administration (NASA), Houston, TX, USA
| | - Brian E Crucian
- National Aeronautics and Space Administration (NASA), Houston, TX, USA
| | | | - David F Dinges
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | | | | | | | | | | | | | | | | | - Ryan P Hillary
- Stanford University School of Medicine, Palo Alto, CA, USA
| | | | | | | | - Peng Jiang
- Northwestern University, Evanston, IL, USA
| | | | | | | | | | | | | | | | - Tyler M Moore
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | | | - Hemal H Patel
- University of California, San Diego, La Jolla, CA, USA
| | | | - Varsha Rao
- Stanford University School of Medicine, Palo Alto, CA, USA
| | - Rintaro Saito
- University of California, San Diego, La Jolla, CA, USA
| | - Denis N Salins
- Stanford University School of Medicine, Palo Alto, CA, USA
| | | | | | | | - Michael B Stenger
- National Aeronautics and Space Administration (NASA), Houston, TX, USA
| | | | | | | | | | - Jing Zhang
- Stanford University School of Medicine, Palo Alto, CA, USA
| | | | - Sara R Zwart
- University of Texas Medical Branch, Galveston, TX, USA
| | - John B Charles
- National Aeronautics and Space Administration (NASA), Houston, TX, USA.
| | - Craig E Kundrot
- Space Life and Physical Sciences Division, NASA Headquarters, Washington, DC, USA.
| | - Graham B I Scott
- National Space Biomedical Research Institute, Baylor College of Medicine, Houston, TX, USA.
| | | | - Mathias Basner
- University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
| | | | | | - Christopher E Mason
- Weill Cornell Medicine, New York, NY, USA. .,The Bin Talal Bin Abdulaziz Alsaud Institute for Computational Biomedicine, New York, NY, USA.,The Feil Family Brain and Mind Research Institute, New York, NY, USA.,The WorldQuant Initiative for Quantitative Prediction, New York, NY, USA
| | | | - Brinda K Rana
- University of California, San Diego, La Jolla, CA, USA.
| | - Scott M Smith
- National Aeronautics and Space Administration (NASA), Houston, TX, USA.
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58
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Cucinotta FA, Cacao E, Kim MHY, Saganti PB. NON-TARGETED EFFECTS LEAD TO A PARIDIGM SHIFT IN RISK ASSESSMENT FOR A MISSION TO THE EARTH'S MOON OR MARTIAN MOON PHOBOS. RADIATION PROTECTION DOSIMETRY 2019; 183:213-218. [PMID: 30576527 DOI: 10.1093/rpd/ncy264] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 11/21/2018] [Indexed: 06/09/2023]
Abstract
Cancer risk is an important limitation for galactic cosmic ray (GCR) exposures, which consist of a wide-energy range of protons, heavy ions and secondary radiation produced in shielding and tissues. Many studies suggest non-targeted effects (NTEs) occur for low doses of high-linear energy transfer (LET) radiation, leading to deviation from the linear dose response model used in radiation protection. We investigate corrections to quality factors (QF) for NTEs, which are used in predictions of fatal cancer risks for exploration missions. Prediction of fatal cancer risks for missions to the Martian moon, Phobos of 500-d and the Earth's moon of 365-d for average solar minimum condition show increases of 2- to 4-fold higher in the NTE model compared with the conventional model. Limitations in estimating uncertainties in NTE model parameters due to sparse radiobiology data at low doses are discussed.
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Affiliation(s)
- Francis A Cucinotta
- Department of Health Physics and Diagnostic Sciences, Univerity of Nevada Las Vegas, Las Vegas, NV, USA
| | - Eliedonna Cacao
- Department of Health Physics and Diagnostic Sciences, Univerity of Nevada Las Vegas, Las Vegas, NV, USA
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59
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Sepulveda E, Sanguanmith S, Meesungnoen J, Jay-Gerin JP. Evaluation of the radioprotective ability of cystamine for 150 keV – 500 MeV proton irradiation: a Monte Carlo track chemistry simulation study. CAN J CHEM 2019. [DOI: 10.1139/cjc-2018-0382] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Cystamine, an organic diamino-disulfide, is among the best of the known radiation-protective compounds, although the underlying molecular mechanisms by which it operates remain poorly understood. This study aims to use the aqueous ferrous sulfate (Fricke) dosimeter to evaluate the protective properties of this compound when present during irradiation by fast incident protons in the energy range of 150 keV – 500 MeV, that is, for “linear energy transfer” (LET) values ranging from ∼72.3 to 0.23 keV/μm. The presence of cystamine in irradiated Fricke solutions prevents the oxidation of Fe2+ ions by the oxidizing species produced in the radiolysis of acidic water, resulting in reduced Fe3+ ion yields. A Monte Carlo computer code is used to simulate the radiation-induced chemistry of the studied Fricke–cystamine solutions under aerated conditions while covering a wide range of cystamine concentrations from 5 × 10−7 to 1 mol/L. Results indicate that the protective activity of cystamine is due to its radical-capturing ability, a clear signature of the strong antioxidant profile of this compound. In addition, our simulations show that at low and intermediate concentrations of cystamine, its protective efficiency decreases with increasing LET, which is consistent with previous work. This finding stems from differences in the geometry of the track structures that change from low-LET isolated spherical “spurs” to high-LET dense continuous cylindrical tracks as LET increases. This study concludes that Monte Carlo simulations represent a powerful method for understanding, at the molecular level, indirect radiation damage to complex molecules such as cystamine.
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Affiliation(s)
- Esteban Sepulveda
- Département de médecine nucléaire et de radiobiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001, 12ème Avenue Nord, Sherbrooke QC J1H 5N4, Canada
- Département de médecine nucléaire et de radiobiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001, 12ème Avenue Nord, Sherbrooke QC J1H 5N4, Canada
| | - Sunuchakan Sanguanmith
- Département de médecine nucléaire et de radiobiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001, 12ème Avenue Nord, Sherbrooke QC J1H 5N4, Canada
- Département de médecine nucléaire et de radiobiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001, 12ème Avenue Nord, Sherbrooke QC J1H 5N4, Canada
| | - Jintana Meesungnoen
- Département de médecine nucléaire et de radiobiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001, 12ème Avenue Nord, Sherbrooke QC J1H 5N4, Canada
- Département de médecine nucléaire et de radiobiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001, 12ème Avenue Nord, Sherbrooke QC J1H 5N4, Canada
| | - Jean-Paul Jay-Gerin
- Département de médecine nucléaire et de radiobiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001, 12ème Avenue Nord, Sherbrooke QC J1H 5N4, Canada
- Département de médecine nucléaire et de radiobiologie, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, 3001, 12ème Avenue Nord, Sherbrooke QC J1H 5N4, Canada
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60
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Capri M, Morsiani C, Santoro A, Moriggi M, Conte M, Martucci M, Bellavista E, Fabbri C, Giampieri E, Albracht K, Flück M, Ruoss S, Brocca L, Canepari M, Longa E, Di Giulio I, Bottinelli R, Cerretelli P, Salvioli S, Gelfi C, Franceschi C, Narici M, Rittweger J. Recovery from 6-month spaceflight at the International Space Station: muscle-related stress into a proinflammatory setting. FASEB J 2019; 33:5168-5180. [PMID: 30620616 PMCID: PMC6436655 DOI: 10.1096/fj.201801625r] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The Sarcolab pilot study of 2 crewmembers, investigated before and after a 6-mo International Space Station mission, has demonstrated the substantial muscle wasting and weakness, along with disruption of muscle's oxidative metabolism. The present work aimed at evaluating the pro/anti-inflammatory status in the same 2 crewmembers (A, B). Blood circulating (c-)microRNAs (miRs), c-proteasome, c-mitochondrial DNA, and cytokines were assessed by real-time quantitative PCR or ELISA tests. Time series analysis was performed ( i.e., before flight and after landing) at 1 and 15 d of recovery (R+1 and R+15, respectively). C-biomarkers were compared with an age-matched control population and with 2-dimensional proteomic analysis of the 2 crewmembers' muscle biopsies. Striking differences were observed between the 2 crewmembers at R+1, in terms of inflamma-miRs (c-miRs-21-5p, -126-3p, and -146a-5p), muscle specific (myo)-miR-206, c-proteasome, and IL-6/leptin, thus making the 2 astronauts dissimilar to each other. Final recovery levels of c-proteasome, c-inflamma-miRs, and c-myo-miR-206 were not reverted to the baseline values in crewmember A. In both crewmembers, myo-miR-206 changed significantly after recovery. Muscle biopsy of astronaut A showed an impressive 80% increase of α-1-antitrypsin, a target of miR-126-3p. These results point to a strong stress response induced by spaceflight involving muscle tissue and the proinflammatory setting, where inflamma-miRs and myo-miR-206 mediate the systemic recovery phase after landing.-Capri, M., Morsiani, C., Santoro, A., Moriggi, M., Conte, M., Martucci, M., Bellavista, E., Fabbri, C., Giampieri, E., Albracht, K., Flück, M., Ruoss, S., Brocca, L., Canepari, M., Longa, E., Di Giulio, I., Bottinelli, R., Cerretelli, P., Salvioli, S., Gelfi, C., Franceschi, C., Narici, M., Rittweger, J. Recovery from 6-month spaceflight at the International Space Station: muscle-related stress into a proinflammatory setting.
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Affiliation(s)
- Miriam Capri
- Department of Experimental, Diagnostic, and Specialty Medicine, University of Bologna, Bologna, Italy.,Galvani Interdepartmental Center, University of Bologna, Bologna, Italy
| | - Cristina Morsiani
- Department of Experimental, Diagnostic, and Specialty Medicine, University of Bologna, Bologna, Italy.,Galvani Interdepartmental Center, University of Bologna, Bologna, Italy
| | - Aurelia Santoro
- Department of Experimental, Diagnostic, and Specialty Medicine, University of Bologna, Bologna, Italy.,Galvani Interdepartmental Center, University of Bologna, Bologna, Italy
| | - Manuela Moriggi
- National Research Council-Institute of Molecular Bioimaging and Physiology (CNR-IBFM), Segrate, Milan, Italy.,Italian National Olympic Committee (CONI), Rome, Italy
| | - Maria Conte
- Department of Experimental, Diagnostic, and Specialty Medicine, University of Bologna, Bologna, Italy.,Galvani Interdepartmental Center, University of Bologna, Bologna, Italy
| | - Morena Martucci
- Department of Experimental, Diagnostic, and Specialty Medicine, University of Bologna, Bologna, Italy.,Galvani Interdepartmental Center, University of Bologna, Bologna, Italy
| | - Elena Bellavista
- Department of Experimental, Diagnostic, and Specialty Medicine, University of Bologna, Bologna, Italy
| | - Cristina Fabbri
- Department of Experimental, Diagnostic, and Specialty Medicine, University of Bologna, Bologna, Italy.,Galvani Interdepartmental Center, University of Bologna, Bologna, Italy
| | - Enrico Giampieri
- Galvani Interdepartmental Center, University of Bologna, Bologna, Italy.,Department of Physics and Astronomy, University of Bologna, Bologna, Italy
| | - Kirsten Albracht
- Faculty of Medical Engineering and Technomathematics, FH Aachen University of Applied Sciences, Aachen, Germany.,Institute of Biomechanics and Orthopaedics, German Sport University, Cologne, Germany
| | - Martin Flück
- Department of Orthopaedics, University of Zürich, Zürich, Switzerland
| | - Severin Ruoss
- Department of Orthopaedics, University of Zürich, Zürich, Switzerland
| | - Lorenza Brocca
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Monica Canepari
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Emanuela Longa
- Sport Medicine Center, University of Pavia, Pavia, Italy
| | - Irene Di Giulio
- Centre of Human and Applied Physiological Sciences, King's College London, London, United Kingdom
| | - Roberto Bottinelli
- Department of Molecular Medicine, University of Pavia, Pavia, Italy.,Fondazione Salvatore Maugeri, Institute of Hospitalization and Scientific Care (IRCCS), Scientific Institute of Pavia, Pavia, Italy
| | - Paolo Cerretelli
- National Research Council-Institute of Molecular Bioimaging and Physiology (CNR-IBFM), Segrate, Milan, Italy.,Italian National Olympic Committee (CONI), Rome, Italy
| | - Stefano Salvioli
- Department of Experimental, Diagnostic, and Specialty Medicine, University of Bologna, Bologna, Italy.,Galvani Interdepartmental Center, University of Bologna, Bologna, Italy
| | - Cecilia Gelfi
- Department of Biomedical Sciences for Health, University of Milan, Milan, Italy.,IRCCS, Istituto Ortopedico Galeazzi, Milan, Italy
| | - Claudio Franceschi
- Department of Applied Mathematics, Institute of Information Technology, Mathematics, and Mechanics (ITMM), Lobachevsky State University of Nizhny Novgorod-National Research University (UNN), Nizhny Novogoro, Russia
| | - Marco Narici
- Department of Biomedical Sciences, University of Padova, Padua, Italy
| | - Jörn Rittweger
- Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany; and.,Department of Pediatrics and Adolescent Medicine, University of Cologne, Cologne, Germany
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61
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Blachowicz A, Chiang AJ, Romsdahl J, Kalkum M, Wang CCC, Venkateswaran K. Proteomic characterization of Aspergillus fumigatus isolated from air and surfaces of the International Space Station. Fungal Genet Biol 2019; 124:39-46. [PMID: 30611835 DOI: 10.1016/j.fgb.2019.01.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Revised: 12/18/2018] [Accepted: 01/02/2019] [Indexed: 12/13/2022]
Abstract
The on-going Microbial Observatory Experiments on the International Space Station (ISS) revealed the presence of various microorganisms that may be affected by the distinct environment of the ISS. The low-nutrient environment combined with enhanced irradiation and microgravity may trigger changes in the molecular suite of microorganisms leading to increased virulence and resistance of microbes. Proteomic characterization of two Aspergillus fumigatus strains, ISSFT-021 and IF1SW-F4, isolated from HEPA filter debris and cupola surface of the ISS, respectively, is presented, along with a comparison to well-studied clinical isolates Af293 and CEA10. In-depth analysis highlights variations in the proteome of both ISS-isolated strains when compared to the clinical strains. Proteins that showed increased abundance in ISS isolates were overall involved in stress responses, and carbohydrate and secondary metabolism. Among the most abundant proteins were Pst2 and ArtA involved in oxidative stress response, PdcA and AcuE responsible for ethanol fermentation and glyoxylate cycle, respectively, TpcA, TpcF, and TpcK that are part of trypacidin biosynthetic pathway, and a toxin Asp-hemolysin. This report provides insight into possible molecular adaptation of filamentous fungi to the unique ISS environment.
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Affiliation(s)
- Adriana Blachowicz
- Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, USA; Biotechnology and Planetary Protection Group, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - Abby J Chiang
- Department of Molecular Immunology, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Jillian Romsdahl
- Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, USA
| | - Markus Kalkum
- Department of Molecular Immunology, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Clay C C Wang
- Department of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, CA, USA; Department of Chemistry, Dornsife College of Letters, Arts, and Sciences, University of Southern California, Los Angeles, CA, USA.
| | - Kasthuri Venkateswaran
- Biotechnology and Planetary Protection Group, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.
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62
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Hada M, Ikeda H, Rhone JR, Beitman AJ, Plante I, Souda H, Yoshida Y, Held KD, Fujiwara K, Saganti PB, Takahashi A. Increased Chromosome Aberrations in Cells Exposed Simultaneously to Simulated Microgravity and Radiation. Int J Mol Sci 2018; 20:E43. [PMID: 30583489 PMCID: PMC6337712 DOI: 10.3390/ijms20010043] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 12/17/2018] [Accepted: 12/19/2018] [Indexed: 12/16/2022] Open
Abstract
Space radiation and microgravity (μG) are two major environmental stressors for humans in space travel. One of the fundamental questions in space biology research is whether the combined effects of μG and exposure to cosmic radiation are interactive. While studies addressing this question have been carried out for half a century in space or using simulated μG on the ground, the reported results are ambiguous. For the assessment and management of human health risks in future Moon and Mars missions, it is necessary to obtain more basic data on the molecular and cellular responses to the combined effects of radiation and µG. Recently we incorporated a μG⁻irradiation system consisting of a 3D clinostat synchronized to a carbon-ion or X-ray irradiation system. Our new experimental setup allows us to avoid stopping clinostat rotation during irradiation, which was required in all other previous experiments. Using this system, human fibroblasts were exposed to X-rays or carbon ions under the simulated μG condition, and chromosomes were collected with the premature chromosome condensation method in the first mitosis. Chromosome aberrations (CA) were quantified by the 3-color fluorescent in situ hybridization (FISH) method. Cells exposed to irradiation under the simulated μG condition showed a higher frequency of both simple and complex types of CA compared to cells irradiated under the static condition by either X-rays or carbon ions.
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Affiliation(s)
- Megumi Hada
- Radiation Institute for Science & Engineering, Prairie View A&M University, Prairie View, TX 77446, USA.
| | - Hiroko Ikeda
- Gunma University Initiative for Advanced Research, Gunma University, Maebashi, Gunma 371-8511, Japan.
| | - Jordan R Rhone
- Radiation Institute for Science & Engineering, Prairie View A&M University, Prairie View, TX 77446, USA.
| | - Andrew J Beitman
- Radiation Institute for Science & Engineering, Prairie View A&M University, Prairie View, TX 77446, USA.
| | - Ianik Plante
- KBRwyle, 2400 NASA Parkway, Houston, TX 77508, USA.
| | - Hikaru Souda
- Heavy Ion Medical Center, Gunma University, Maebashi, Gunma 371-8511, Japan.
| | - Yukari Yoshida
- Heavy Ion Medical Center, Gunma University, Maebashi, Gunma 371-8511, Japan.
| | - Kathryn D Held
- Gunma University Initiative for Advanced Research, Gunma University, Maebashi, Gunma 371-8511, Japan.
- Department of Radiation Oncology, Massachusetts General Hospital/Harvard Medical School, Boston, MA 02114, USA.
| | - Keigi Fujiwara
- Department of Cadiology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
| | - Premkumar B Saganti
- Radiation Institute for Science & Engineering, Prairie View A&M University, Prairie View, TX 77446, USA.
| | - Akihisa Takahashi
- Heavy Ion Medical Center, Gunma University, Maebashi, Gunma 371-8511, Japan.
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63
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Cucinotta FA, Smirnova OA. Dependence of the human leukemia risk on the dose and dose rate of continuous irradiation: Modeling study. LIFE SCIENCES IN SPACE RESEARCH 2018; 19:17-23. [PMID: 30482277 DOI: 10.1016/j.lssr.2018.08.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 07/24/2018] [Accepted: 08/14/2018] [Indexed: 06/09/2023]
Abstract
A biologically motivated dynamical model of the radiogenic leukemia risk assessment (Smirnova, 2015, 2017; Smirnova and Cucinotta, 2018) is applied to the study of the effects of dose rate N and dose D on the excess relative risk ERR for non-CLL leukemia among continuously irradiated humans. In the study, the dose rate N of continuous irradiation is varied from 3×10-6 to 0.576 Sv/day and the dose D is varied from zero to 2.2 Sv. In the considered range of doses D, the developed model reproduces the linear dependence of ERR on D for the low dose rates N. For higher N, the dependence of ERR on D remains linear for low doses D and becomes nonlinear for higher D, that agrees with empirical observations. In turn, for the considered values of D, the developed model reproduces the practical independence of the ratio ERR/D on N at low N, the inverse dependence of the ratio ERR/D on N at higher N, and the direct dependence of the ratio ERR/D on N at more high N, that also conforms to empirical observations. Additionally, the modeling values of ERR obtained for the scenarios of continuous irradiation corresponding to those for the nuclear industry workers, Chernobyl cleanup workers, and patients treated with radiotherapy, practically, coincide with the respective empirical data. All these modeling findings, along with those obtained in our previous works, demonstrate the predictive power of the developed model and its capability of estimating, on quantitative level, the excess relative risk for non-CLL leukemia among humans exposed to continuous irradiation in wide ranges of doses and dose rates.
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Affiliation(s)
- Francis A Cucinotta
- Department of Health Physics and Diagnostic Sciences, University of Nevada, Las Vegas, NV, USA.
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64
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Female mice are protected from space radiation-induced maladaptive responses. Brain Behav Immun 2018; 74:106-120. [PMID: 30107198 PMCID: PMC8715721 DOI: 10.1016/j.bbi.2018.08.008] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 08/01/2018] [Accepted: 08/03/2018] [Indexed: 01/15/2023] Open
Abstract
Interplanetary exploration will be humankind's most ambitious expedition and the journey required to do so, is as intimidating as it is intrepid. One major obstacle for successful deep space travel is the possible negative effects of galactic cosmic radiation (GCR) exposure. Here, we investigate for the first time how combined GCR impacts long-term behavioral and cellular responses in male and female mice. We find that a single exposure to simulated GCR induces long-term cognitive and behavioral deficits only in the male cohorts. GCR exposed male animals have diminished social interaction, increased anxiety-like phenotype and impaired recognition memory. Remarkably, we find that the female cohorts did not display any cognitive or behavioral deficits after GCR exposure. Mechanistically, the maladaptive behavioral responses observed only in the male cohorts correspond with microglia activation and synaptic loss in the hippocampus, a brain region involved in the cognitive domains reported here. Furthermore, we measured reductions in AMPA expressing synaptic terminals in the hippocampus. No changes in any of the molecular markers measured here are observed in the females. Taken together these findings suggest that GCR exposure can regulate microglia activity and alter synaptic architecture, which in turn leads to a range of cognitive alterations in a sex dependent manner. These results identify sex-dependent differences in behavioral and cognitive domains revealing promising cellular and molecular intervention targets to reduce GCR-induced chronic cognitive deficits thereby boosting chances of success for humans in deep space missions such as the upcoming Mars voyage.
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65
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Rosi S. The final frontier: Transient microglia reduction after cosmic radiation exposure mitigates cognitive impairments and modulates phagocytic activity. Brain Circ 2018; 4:109-113. [PMID: 30450416 PMCID: PMC6187945 DOI: 10.4103/bc.bc_24_18] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2018] [Revised: 08/24/2018] [Accepted: 09/10/2018] [Indexed: 11/21/2022] Open
Abstract
Microglia are the primary immune element within the brain, which are responsible for monitoring synapse function and neuron health. Exposure to cosmic radiation has the potential to cause long-term cognitive deficits in rodent models and therefore indicates a difficult challenge for future astronauts piloting interplanetary travel. Here, we discuss the potential of transient microglia depletion after the injury to ameliorate the harsh microenvironment of the brain and eliminate any potential long-term cognitive effects. Repopulation of microglia enables phagocytic phenotypes to be circumvented, via the reduction of Phagocytic and lysosomal markers, potentially being responsible for increased neuroprotection. Brief depletion of microglia after irradiation mitigated the development of any long-term memory deficits, comparable to healthy animals. Chronically, microglial levels were not affected by cosmic radiation followed by temporary microglia depletion. Following repopulation, improved recognition memory was paralleled by downregulated complement receptor C5aR. Preserved synapse function also demonstrated the therapeutic ability of microglia depletion as it corresponded with fewer phagocytic microglia phenotypes. The understanding of long-term radiation-induced cognitive impairments is vital for the protection of future astronauts and equally as important for current cancer patients. Temporary microglia depletion showed promise in preventing any deleterious cognitive impairments following exposure to elements of cosmic radiation, such as helium and high-charge nuclei.
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Affiliation(s)
- Susanna Rosi
- Department of Physical Therapy and Rehabilitation Science, University of California, San Francisco, CA, USA.,Brain and Spinal Injury Center, University of California, San Francisco, CA, USA.,Department of Neurological Surgery, University of California, San Francisco, CA, USA.,Weill Institute for Neuroscience, University of California, San Francisco, CA, USA.,Kavli Institute of Fundamental Neuroscience, University of California, San Francisco, CA, USA
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66
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Panesar SS, Ashkan K. Surgery in space. Br J Surg 2018; 105:1234-1243. [DOI: 10.1002/bjs.10908] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 03/12/2018] [Accepted: 05/11/2018] [Indexed: 01/17/2023]
Abstract
Abstract
Background
There has been renewed public interest in manned space exploration owing to novel initiatives by private and governmental bodies. Long-term goals include manned missions to, and potential colonization of, nearby planets. Travel distances and mission length required for these would render Earth-based treatment and telemedical solutions unfeasible. These issues present an anticipatory challenge to planners, and novel or adaptive medical technologies must therefore be devised to diagnose and treat the range of medical issues that future space travellers will encounter.
Methods
The aim was to conduct a search of the literature pertaining to human physiology, pathology, trauma and surgery in space.
Results
Known physiological alterations include fluid redistribution, cardiovascular changes, bone and muscle atrophy, and effects of ionizing radiation. Potential pathological mechanisms identified include trauma, cancer and common surgical conditions, such as appendicitis.
Conclusion
Potential surgical treatment modalities must consist of self-sufficient and adaptive technology, especially in the face of uncertain pathophysiological mechanisms and logistical concerns.
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Affiliation(s)
- S S Panesar
- Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - K Ashkan
- Department of Neurosurgery, King's College Hospital NHS Foundation Trust, London, UK
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67
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Krukowski K, Jones T, Campbell-Beachler M, Nelson G, Rosi S. Peripheral T Cells as a Biomarker for Oxygen-Ion-Radiation-Induced Social Impairments. Radiat Res 2018; 190:186-193. [DOI: 10.1667/rr15046.1] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
| | - Tamako Jones
- Department of Basic Sciences, Division of Biomedical Engineering Sciences, Loma Linda University, Loma Linda, California
| | - Mary Campbell-Beachler
- Department of Basic Sciences, Division of Biomedical Engineering Sciences, Loma Linda University, Loma Linda, California
| | - Gregory Nelson
- Department of Basic Sciences, Division of Biomedical Engineering Sciences, Loma Linda University, Loma Linda, California
| | - Susanna Rosi
- Department of Physical Therapy and Rehabilitation Science
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68
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Krukowski K, Feng X, Paladini MS, Chou A, Sacramento K, Grue K, Riparip LK, Jones T, Campbell-Beachler M, Nelson G, Rosi S. Temporary microglia-depletion after cosmic radiation modifies phagocytic activity and prevents cognitive deficits. Sci Rep 2018; 8:7857. [PMID: 29777152 PMCID: PMC5959907 DOI: 10.1038/s41598-018-26039-7] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 05/02/2018] [Indexed: 12/19/2022] Open
Abstract
Microglia are the main immune component in the brain that can regulate neuronal health and synapse function. Exposure to cosmic radiation can cause long-term cognitive impairments in rodent models thereby presenting potential obstacles for astronauts engaged in deep space travel. The mechanism/s for how cosmic radiation induces cognitive deficits are currently unknown. We find that temporary microglia depletion, one week after cosmic radiation, prevents the development of long-term memory deficits. Gene array profiling reveals that acute microglia depletion alters the late neuroinflammatory response to cosmic radiation. The repopulated microglia present a modified functional phenotype with reduced expression of scavenger receptors, lysosome membrane protein and complement receptor, all shown to be involved in microglia-synapses interaction. The lower phagocytic activity observed in the repopulated microglia is paralleled by improved synaptic protein expression. Our data provide mechanistic evidence for the role of microglia in the development of cognitive deficits after cosmic radiation exposure.
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Affiliation(s)
- Karen Krukowski
- Department of Physical Therapy and Rehabilitation Science, University of California, San Francisco, CA, USA.,Brain and Spinal Injury Center, University of California, San Francisco, CA, USA
| | - Xi Feng
- Department of Physical Therapy and Rehabilitation Science, University of California, San Francisco, CA, USA.,Brain and Spinal Injury Center, University of California, San Francisco, CA, USA
| | - Maria Serena Paladini
- Department of Physical Therapy and Rehabilitation Science, University of California, San Francisco, CA, USA.,Brain and Spinal Injury Center, University of California, San Francisco, CA, USA
| | - Austin Chou
- Department of Physical Therapy and Rehabilitation Science, University of California, San Francisco, CA, USA.,Brain and Spinal Injury Center, University of California, San Francisco, CA, USA
| | - Kristen Sacramento
- Department of Physical Therapy and Rehabilitation Science, University of California, San Francisco, CA, USA.,Brain and Spinal Injury Center, University of California, San Francisco, CA, USA
| | - Katherine Grue
- Department of Physical Therapy and Rehabilitation Science, University of California, San Francisco, CA, USA.,Brain and Spinal Injury Center, University of California, San Francisco, CA, USA
| | - Lara-Kirstie Riparip
- Department of Physical Therapy and Rehabilitation Science, University of California, San Francisco, CA, USA.,Brain and Spinal Injury Center, University of California, San Francisco, CA, USA
| | - Tamako Jones
- Department of Basic Sciences, Division of Biomedical Engineering Sciences, Loma Linda University, Loma Linda, CA, USA
| | - Mary Campbell-Beachler
- Department of Basic Sciences, Division of Biomedical Engineering Sciences, Loma Linda University, Loma Linda, CA, USA
| | - Gregory Nelson
- Department of Basic Sciences, Division of Biomedical Engineering Sciences, Loma Linda University, Loma Linda, CA, USA
| | - Susanna Rosi
- Department of Physical Therapy and Rehabilitation Science, University of California, San Francisco, CA, USA. .,Brain and Spinal Injury Center, University of California, San Francisco, CA, USA. .,Department of Neurological Surgery, University of California, San Francisco, CA, USA. .,Weill Institute for Neuroscience, University of California San Francisco, San Francisco, CA, USA. .,Kavli Institute of Fundamental Neuroscience, University of California San Francisco, San Francisco, CA, USA.
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69
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Galactic Cosmic Radiation Induces Persistent Epigenome Alterations Relevant to Human Lung Cancer. Sci Rep 2018; 8:6709. [PMID: 29712937 PMCID: PMC5928241 DOI: 10.1038/s41598-018-24755-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 03/27/2018] [Indexed: 12/14/2022] Open
Abstract
Human deep space and planetary travel is limited by uncertainties regarding the health risks associated with exposure to galactic cosmic radiation (GCR), and in particular the high linear energy transfer (LET), heavy ion component. Here we assessed the impact of two high-LET ions 56Fe and 28Si, and low-LET X rays on genome-wide methylation patterns in human bronchial epithelial cells. We found that all three radiation types induced rapid and stable changes in DNA methylation but at distinct subsets of CpG sites affecting different chromatin compartments. The 56Fe ions induced mostly hypermethylation, and primarily affected sites in open chromatin regions including enhancers, promoters and the edges ("shores") of CpG islands. The 28Si ion-exposure had mixed effects, inducing both hyper and hypomethylation and affecting sites in more repressed heterochromatic environments, whereas X rays induced mostly hypomethylation, primarily at sites in gene bodies and intergenic regions. Significantly, the methylation status of 56Fe ion sensitive sites, but not those affected by X ray or 28Si ions, discriminated tumor from normal tissue for human lung adenocarcinomas and squamous cell carcinomas. Thus, high-LET radiation exposure leaves a lasting imprint on the epigenome, and affects sites relevant to human lung cancer. These methylation signatures may prove useful in monitoring the cumulative biological impact and associated cancer risks encountered by astronauts in deep space.
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70
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Patel R, Qing Y, Kennedy L, Yan Y, Pink J, Aguila B, Desai A, Gerson SL, Welford SM. MMR Deficiency Does Not Sensitize or Compromise the Function of Hematopoietic Stem Cells to Low and High LET Radiation. Stem Cells Transl Med 2018; 7:513-520. [PMID: 29656536 PMCID: PMC6052615 DOI: 10.1002/sctm.17-0295] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 03/20/2018] [Indexed: 12/12/2022] Open
Abstract
One of the major health concerns on long-duration space missions will be radiation exposure to the astronauts. Outside the earth's magnetosphere, astronauts will be exposed to galactic cosmic rays (GCR) and solar particle events that are principally composed of protons and He, Ca, O, Ne, Si, Ca, and Fe nuclei. Protons are by far the most common species, but the higher atomic number particles are thought to be more damaging to biological systems. Evaluation and amelioration of risks from GCR exposure will be important for deep space travel. The hematopoietic system is one of the most radiation-sensitive organ systems, and is highly dependent on functional DNA repair pathways for survival. Recent results from our group have demonstrated an acquired deficiency in mismatch repair (MMR) in human hematopoietic stem cells (HSCs) with age due to functional loss of the MLH1 protein, suggesting an additional risk to astronauts who may have significant numbers of MMR deficient HSCs at the time of space travel. In the present study, we investigated the effects gamma radiation, proton radiation, and 56 Fe radiation on HSC function in Mlh1+/+ and Mlh1-/- marrow from mice in a variety of assays and have determined that while cosmic radiation is a major risk to the hematopoietic system, there is no dependence on MMR capacity. Stem Cells Translational Medicine 2018;7:513-520.
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Affiliation(s)
| | - Yulan Qing
- Case Comprehensive Cancer Center, National Center for Regenerative Medicine, Seidman Cancer Center, University Hospitals Cleveland Medical center and Case Western Reserve University, Cleveland, Ohio, USA
| | - Lucy Kennedy
- Unit for Laboratory and Animal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Yan Yan
- Case Comprehensive Cancer Center, National Center for Regenerative Medicine, Seidman Cancer Center, University Hospitals Cleveland Medical center and Case Western Reserve University, Cleveland, Ohio, USA
| | - John Pink
- Case Comprehensive Cancer Center, National Center for Regenerative Medicine, Seidman Cancer Center, University Hospitals Cleveland Medical center and Case Western Reserve University, Cleveland, Ohio, USA
| | - Brittany Aguila
- Department of Biochemistry, Case Western Reserve University, Cleveland, Ohio, USA
| | - Amar Desai
- Case Comprehensive Cancer Center, National Center for Regenerative Medicine, Seidman Cancer Center, University Hospitals Cleveland Medical center and Case Western Reserve University, Cleveland, Ohio, USA
| | - Stanton L Gerson
- Case Comprehensive Cancer Center, National Center for Regenerative Medicine, Seidman Cancer Center, University Hospitals Cleveland Medical center and Case Western Reserve University, Cleveland, Ohio, USA
| | - Scott M Welford
- Department of Radiation Oncology, Sylvester Cancer Center, University of Miami, Miami, Florida, USA
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71
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Hasan KM, Mwangi B, Keser Z, Riascos R, Sargsyan AE, Kramer LA. Brain Quantitative MRI Metrics in Astronauts as a Unique Professional Group. J Neuroimaging 2018; 28:256-268. [DOI: 10.1111/jon.12501] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 01/04/2018] [Accepted: 01/16/2018] [Indexed: 11/28/2022] Open
Affiliation(s)
- Khader M. Hasan
- Medical SchoolDepartment of Diagnostic and Interventional ImagingThe University of Texas Health Science Center Houston TX
| | - Benson Mwangi
- Medical SchoolDepartment of PsychiatryThe University of Texas Health Science Center Houston TX
| | - Zafer Keser
- Medical SchoolDepartment of NeurologyThe University of Texas Health Science Center Houston TX
| | - Roy Riascos
- Medical SchoolDepartment of Diagnostic and Interventional ImagingThe University of Texas Health Science Center Houston TX
| | | | - Larry A. Kramer
- Medical SchoolDepartment of Diagnostic and Interventional ImagingThe University of Texas Health Science Center Houston TX
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72
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Durante M, Cucinotta FA, Loeffler JS. Editorial: Charged Particles in Oncology. Front Oncol 2017; 7:301. [PMID: 29276698 PMCID: PMC5727012 DOI: 10.3389/fonc.2017.00301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Accepted: 11/23/2017] [Indexed: 02/05/2023] Open
Affiliation(s)
- Marco Durante
- Trento Institute for Fundamental Physics and Applications (TIFPA), National Institute of Nuclear Physics (INFN), University of Trento, Rome, Italy
| | | | - Jay S Loeffler
- Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States
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73
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Sasi SP, Yan X, Zuriaga-Herrero M, Gee H, Lee J, Mehrzad R, Song J, Onufrak J, Morgan J, Enderling H, Walsh K, Kishore R, Goukassian DA. Different Sequences of Fractionated Low-Dose Proton and Single Iron-Radiation-Induced Divergent Biological Responses in the Heart. Radiat Res 2017; 188:191-203. [PMID: 28613990 DOI: 10.1667/rr14667.1] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Deep-space travel presents risks of exposure to ionizing radiation composed of a spectrum of low-fluence protons (1H) and high-charge and energy (HZE) iron nuclei (e.g., 56Fe). When exposed to galactic cosmic rays, each cell in the body may be traversed by 1H every 3-4 days and HZE nuclei every 3-4 months. The effects of low-dose sequential fractionated 1H or HZE on the heart are unknown. In this animal model of simulated ionizing radiation, middle-aged (8-9 months old) male C57BL/6NT mice were exposed to radiation as follows: group 1, nonirradiated controls; group 2, three fractionated doses of 17 cGy 1H every other day (1H × 3); group 3, three fractionated doses of 17 cGy 1H every other day followed by a single low dose of 15 cGy 56Fe two days after the final 1H dose (1H × 3 + 56Fe); and group 4, a single low dose of 15 cGy 56Fe followed (after 2 days) by three fractionated doses of 17 cGy 1H every other day (56Fe + 1H × 3). A subgroup of mice from each group underwent myocardial infarction (MI) surgery at 28 days postirradiation. Cardiac structure and function were assessed in all animals at days 7, 14 and 28 after MI surgery was performed. Compared to the control animals, the treatments that groups 2 and 3 received did not induce negative effects on cardiac function or structure. However, compared to all other groups, the animals in group 4, showed depressed left ventricular (LV) functions at 1 month with concomitant enhancement in cardiac fibrosis and induction of cardiac hypertrophy signaling at 3 months. In the irradiated and MI surgery groups compared to the control group, the treatments received by groups 2 and 4 did not induce negative effects at 1 month postirradiation and MI surgery. However, in group 3 after MI surgery, there was a 24% increase in mortality, significant decreases in LV function and a 35% increase in post-infarction size. These changes were associated with significant decreases in the angiogenic and cell survival signaling pathways. These data suggest that fractionated doses of radiation induces cellular and molecular changes that result in depressed heart functions both under basal conditions and particularly after myocardial infarction.
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Affiliation(s)
- Sharath P Sasi
- a Cardiovascular Research Center, GeneSys Research Institute, Boston, Massachusetts
| | - Xinhua Yan
- a Cardiovascular Research Center, GeneSys Research Institute, Boston, Massachusetts.,b Tufts University School of Medicine, Boston, Massachusetts
| | - Marian Zuriaga-Herrero
- f Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts
| | - Hannah Gee
- a Cardiovascular Research Center, GeneSys Research Institute, Boston, Massachusetts
| | - Juyong Lee
- c Calhoun Cardiology Center, University of Connecticut Health Center, Farmington, Connecticut
| | - Raman Mehrzad
- d Steward Carney Hospital, Dorchester, Massachusetts
| | - Jin Song
- a Cardiovascular Research Center, GeneSys Research Institute, Boston, Massachusetts
| | - Jillian Onufrak
- a Cardiovascular Research Center, GeneSys Research Institute, Boston, Massachusetts
| | - James Morgan
- b Tufts University School of Medicine, Boston, Massachusetts.,d Steward Carney Hospital, Dorchester, Massachusetts
| | - Heiko Enderling
- e Department of Integrated Mathematical Oncology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, Florida
| | - Kenneth Walsh
- f Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts
| | - Raj Kishore
- 7 Center for Translational Medicine, Temple University School of Medicine, Philadelphia, Pennsylvania
| | - David A Goukassian
- a Cardiovascular Research Center, GeneSys Research Institute, Boston, Massachusetts.,f Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, Massachusetts.,7 Center for Translational Medicine, Temple University School of Medicine, Philadelphia, Pennsylvania
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74
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Cucinotta FA, To K, Cacao E. Predictions of space radiation fatality risk for exploration missions. LIFE SCIENCES IN SPACE RESEARCH 2017; 13:1-11. [PMID: 28554504 DOI: 10.1016/j.lssr.2017.01.005] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 01/31/2017] [Indexed: 06/07/2023]
Abstract
UNLABELLED In this paper we describe revisions to the NASA Space Cancer Risk (NSCR) model focusing on updates to probability distribution functions (PDF) representing the uncertainties in the radiation quality factor (QF) model parameters and the dose and dose-rate reduction effectiveness factor (DDREF). We integrate recent heavy ion data on liver, colorectal, intestinal, lung, and Harderian gland tumors with other data from fission neutron experiments into the model analysis. In an earlier work we introduced distinct QFs for leukemia and solid cancer risk predictions, and here we consider liver cancer risks separately because of the higher RBE's reported in mouse experiments compared to other tumors types, and distinct risk factors for liver cancer for astronauts compared to the U.S. POPULATION The revised model is used to make predictions of fatal cancer and circulatory disease risks for 1-year deep space and International Space Station (ISS) missions, and a 940 day Mars mission. We analyzed the contribution of the various model parameter uncertainties to the overall uncertainty, which shows that the uncertainties in relative biological effectiveness (RBE) factors at high LET due to statistical uncertainties and differences across tissue types and mouse strains are the dominant uncertainty. NASA's exposure limits are approached or exceeded for each mission scenario considered. Two main conclusions are made: 1) Reducing the current estimate of about a 3-fold uncertainty to a 2-fold or lower uncertainty will require much more expansive animal carcinogenesis studies in order to reduce statistical uncertainties and understand tissue, sex and genetic variations. 2) Alternative model assumptions such as non-targeted effects, increased tumor lethality and decreased latency at high LET, and non-cancer mortality risks from circulatory diseases could significantly increase risk estimates to several times higher than the NASA limits.
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Affiliation(s)
- Francis A Cucinotta
- Department of Health Physics and Diagnostic Sciences, University of Nevada, Las Vegas, NV, United States of America.
| | - Khiet To
- Department of Health Physics and Diagnostic Sciences, University of Nevada, Las Vegas, NV, United States of America
| | - Eliedonna Cacao
- Department of Health Physics and Diagnostic Sciences, University of Nevada, Las Vegas, NV, United States of America
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75
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Shuryak I. Quantitative modeling of responses to chronic ionizing radiation exposure using targeted and non-targeted effects. PLoS One 2017; 12:e0176476. [PMID: 28441437 PMCID: PMC5404850 DOI: 10.1371/journal.pone.0176476] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 04/11/2017] [Indexed: 11/28/2022] Open
Abstract
The biological effects of chronic ionizing radiation exposure can be difficult to study, but important to understand in order to protect the health of occupationally-exposed persons and victims of radiological accidents or malicious events. They include targeted effects (TE) caused by ionizations within/close to nuclear DNA, and non-targeted effects (NTE) caused by damage to other cell structures and/or activation of stress-signaling pathways in distant cells. Data on radiation damage in animal populations exposed over multiple generations to wide ranges of dose rates after the Chernobyl nuclear-power-plant accident are very useful for enhancing our understanding of these processes. We used a mechanistically-motivated mathematical model which includes TE and NTE to analyze a large published data set on chromosomal aberrations in pond snail (Lymnaea stagnalis) embryos collected over 16 years from water bodies contaminated by Chernobyl fallout, and from control locations. The fraction of embryo cells with aberrations increased dramatically (>10-fold) and non-linearly over a dose rate range of 0.03–420 μGy/h (0.00026–3.7 Gy/year). NTE were very important for describing the non-linearity of this radiation response: the TE-only model (without NTE) performed dramatically worse than the TE+NTE model. NTE were predicted to reach ½ of maximal intensity at 2.5 μGy/h (0.022 Gy/year) and to contribute >90% to the radiation response slope at dose rates <11 μGy/h (0.1 Gy/year). Internally-incorporated 90Sr was possibly more effective per unit dose than other radionuclides. The radiation response shape for chromosomal aberrations in snail embryos was consistent with data for a different endpoint: the fraction of young amoebocytes in adult snail haemolymph. Therefore, radiation may affect different snail life stages by similar mechanisms. The importance of NTE in our model-based analysis suggests that the search for modulators of NTE-related signaling pathways could be a promising strategy for mitigating the deleterious effects of chronic irradiation.
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Affiliation(s)
- Igor Shuryak
- Center for Radiological Research, Columbia University, New York, NY, United States of America
- * E-mail:
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76
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Hanu AR, Barberiz J, Bonneville D, Byun SH, Chen L, Ciambella C, Dao E, Deshpande V, Garnett R, Hunter SD, Jhirad A, Johnston EM, Kordic M, Kurnell M, Lopera L, McFadden M, Melnichuk A, Nguyen J, Otto A, Scott R, Wagner DL, Wiendels M. NEUDOSE: A CubeSat Mission for Dosimetry of Charged Particles and Neutrons in Low-Earth Orbit. Radiat Res 2016; 187:42-49. [PMID: 28001909 DOI: 10.1667/rr14491.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
During space missions, astronauts are exposed to a stream of energetic and highly ionizing radiation particles that can suppress immune system function, increase cancer risks and even induce acute radiation syndrome if the exposure is large enough. As human exploration goals shift from missions in low-Earth orbit (LEO) to long-duration interplanetary missions, radiation protection remains one of the key technological issues that must be resolved. In this work, we introduce the NEUtron DOSimetry & Exploration (NEUDOSE) CubeSat mission, which will provide new measurements of dose and space radiation quality factors to improve the accuracy of cancer risk projections for current and future space missions. The primary objective of the NEUDOSE CubeSat is to map the in situ lineal energy spectra produced by charged particles and neutrons in LEO where most of the preparatory activities for future interplanetary missions are currently taking place. To perform these measurements, the NEUDOSE CubeSat is equipped with the Charged & Neutral Particle Tissue Equivalent Proportional Counter (CNP-TEPC), an advanced radiation monitoring instrument that uses active coincidence techniques to separate the interactions of charged particles and neutrons in real time. The NEUDOSE CubeSat, currently under development at McMaster University, provides a modern approach to test the CNP-TEPC instrument directly in the unique environment of outer space while simultaneously collecting new georeferenced lineal energy spectra of the radiation environment in LEO.
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Affiliation(s)
- A R Hanu
- a NASA Goddard Space Flight Center, Greenbelt, Maryland 20771
| | - J Barberiz
- Department of bElectrical and Computer Engineering, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - D Bonneville
- c Department of Engineering Physics, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - S H Byun
- d Department of Medical Physics and Applied Radiation Sciences, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - L Chen
- c Department of Engineering Physics, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - C Ciambella
- f Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - E Dao
- d Department of Medical Physics and Applied Radiation Sciences, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - V Deshpande
- e Department of Mechanical Engineering, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - R Garnett
- d Department of Medical Physics and Applied Radiation Sciences, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - S D Hunter
- a NASA Goddard Space Flight Center, Greenbelt, Maryland 20771
| | - A Jhirad
- Department of bElectrical and Computer Engineering, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - E M Johnston
- d Department of Medical Physics and Applied Radiation Sciences, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - M Kordic
- Department of bElectrical and Computer Engineering, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - M Kurnell
- c Department of Engineering Physics, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - L Lopera
- f Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - M McFadden
- d Department of Medical Physics and Applied Radiation Sciences, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - A Melnichuk
- Department of bElectrical and Computer Engineering, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - J Nguyen
- Department of bElectrical and Computer Engineering, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - A Otto
- e Department of Mechanical Engineering, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - R Scott
- e Department of Mechanical Engineering, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - D L Wagner
- c Department of Engineering Physics, McMaster University, Hamilton, Ontario L8S 4K1, Canada
| | - M Wiendels
- Department of bElectrical and Computer Engineering, McMaster University, Hamilton, Ontario L8S 4K1, Canada
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77
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Rithidech KN, Jangiam W, Tungjai M, Gordon C, Honikel L, Whorton EB. Induction of Chronic Inflammation and Altered Levels of DNA Hydroxymethylation in Somatic and Germinal Tissues of CBA/CaJ Mice Exposed to (48)Ti Ions. Front Oncol 2016; 6:155. [PMID: 27446801 PMCID: PMC4921787 DOI: 10.3389/fonc.2016.00155] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 06/10/2016] [Indexed: 11/17/2022] Open
Abstract
Although the lung is one of the target organs at risk for cancer induction from exposure to heavy ions found in space, information is insufficient on cellular/molecular responses linked to increased cancer risk. Knowledge of such events may aid in the development of new preventive measures. Furthermore, although it is known that germinal cells are sensitive to X- or γ-rays, there is little information on the effects of heavy ions on germinal cells. Our goal was to investigate in vivo effects of 1 GeV/n (48)Ti ions (one of the important heavy ions found in the space environment) on somatic (lung) and germinal (testis) tissues collected at various times after a whole body irradiation of CBA/CaJ mice (0, 0.1, 0.25, or 0.5 Gy, delivered at 1 cGy/min). We hypothesized that (48)Ti-ion-exposure induced damage in both tissues. Lung tissue was collected from each mouse from each treatment group at 1 week, 1 month, and 6 months postirradiation. For the testis, we collected samples at 6 months postirradiation. Hence, only late-occurring effects of (48)Ti ions in the testis were studied. There were five mice per treatment group at each harvest time. We investigated inflammatory responses after exposure to (48)Ti ions by measuring the levels of activated nuclear factor kappa B and selected pro-inflammatory cytokines in both tissues of the same mouse. These measurements were coupled with the quantitation of the levels of global 5-methylcytosine (5mC) and 5-hydroxymethylcytosine (5hmC). Our data clearly showed the induction of chronic inflammation in both tissues of exposed mice. A dose-dependent reduction in global 5hmC was found in the lung at all time-points and in testes collected at 6 months postirradiation. In contrast, significant increases in global 5mC were found only in lung and testes collected at 6 months postirradiation from mice exposed to 0.5 Gy of 1 GeV/n (48)Ti ions. Overall, our data showed that (48)Ti ions may create health risks in both lung and testicular tissues.
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Affiliation(s)
| | - Witawat Jangiam
- Department of Pathology, Stony Brook University, Stony Brook, NY, USA
- Department of Chemical Engineering, Faculty of Engineering, Burapha University, Chonburi, Thailand
| | - Montree Tungjai
- Department of Pathology, Stony Brook University, Stony Brook, NY, USA
- Department of Radiologic Technology, Faculty of Associated Medical Sciences, Center of Excellence for Molecular Imaging, Chiang Mai University, Chiang Mai, Thailand
| | - Chris Gordon
- Department of Pathology, Stony Brook University, Stony Brook, NY, USA
| | - Louise Honikel
- Department of Pathology, Stony Brook University, Stony Brook, NY, USA
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78
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Pani G, Verslegers M, Quintens R, Samari N, de Saint-Georges L, van Oostveldt P, Baatout S, Benotmane MA. Combined Exposure to Simulated Microgravity and Acute or Chronic Radiation Reduces Neuronal Network Integrity and Survival. PLoS One 2016; 11:e0155260. [PMID: 27203085 PMCID: PMC4874625 DOI: 10.1371/journal.pone.0155260] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 04/26/2016] [Indexed: 12/21/2022] Open
Abstract
During orbital or interplanetary space flights, astronauts are exposed to cosmic radiations and microgravity. However, most earth-based studies on the potential health risks of space conditions have investigated the effects of these two conditions separately. This study aimed at assessing the combined effect of radiation exposure and microgravity on neuronal morphology and survival in vitro. In particular, we investigated the effects of simulated microgravity after acute (X-rays) or during chronic (Californium-252) exposure to ionizing radiation using mouse mature neuron cultures. Acute exposure to low (0.1 Gy) doses of X-rays caused a delay in neurite outgrowth and a reduction in soma size, while only the high dose impaired neuronal survival. Of interest, the strongest effect on neuronal morphology and survival was evident in cells exposed to microgravity and in particular in cells exposed to both microgravity and radiation. Removal of neurons from simulated microgravity for a period of 24 h was not sufficient to recover neurite length, whereas the soma size showed a clear re-adaptation to normal ground conditions. Genome-wide gene expression analysis confirmed a modulation of genes involved in neurite extension, cell survival and synaptic communication, suggesting that these changes might be responsible for the observed morphological effects. In general, the observed synergistic changes in neuronal network integrity and cell survival induced by simulated space conditions might help to better evaluate the astronaut's health risks and underline the importance of investigating the central nervous system and long-term cognition during and after a space flight.
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Affiliation(s)
- Giuseppe Pani
- Radiobiology Unit, Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre, SCK•CEN, Mol, Belgium
- Cell Systems and Imaging Research Group (CSI), Department of Molecular Biotechnology, Ghent University, Ghent, Belgium
- Laboratory of Membrane Biochemistry and Applied Nutrition, Department of Pharmacology and Bio-molecular Sciences (DiSFeB), Università degli Studi di Milano, Milano, Italy
| | - Mieke Verslegers
- Radiobiology Unit, Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre, SCK•CEN, Mol, Belgium
| | - Roel Quintens
- Radiobiology Unit, Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre, SCK•CEN, Mol, Belgium
| | - Nada Samari
- Radiobiology Unit, Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre, SCK•CEN, Mol, Belgium
| | - Louis de Saint-Georges
- Radiobiology Unit, Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre, SCK•CEN, Mol, Belgium
| | - Patrick van Oostveldt
- Cell Systems and Imaging Research Group (CSI), Department of Molecular Biotechnology, Ghent University, Ghent, Belgium
| | - Sarah Baatout
- Radiobiology Unit, Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre, SCK•CEN, Mol, Belgium
- Cell Systems and Imaging Research Group (CSI), Department of Molecular Biotechnology, Ghent University, Ghent, Belgium
| | - Mohammed Abderrafi Benotmane
- Radiobiology Unit, Laboratory of Molecular and Cellular Biology, Institute for Environment, Health and Safety, Belgian Nuclear Research Centre, SCK•CEN, Mol, Belgium
- * E-mail:
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79
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Mukhopadhyay S, Saha R, Palanisamy A, Ghosh M, Biswas A, Roy S, Pal A, Sarkar K, Bagh S. A systems biology pipeline identifies new immune and disease related molecular signatures and networks in human cells during microgravity exposure. Sci Rep 2016; 6:25975. [PMID: 27185415 PMCID: PMC4868995 DOI: 10.1038/srep25975] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Accepted: 04/26/2016] [Indexed: 12/29/2022] Open
Abstract
Microgravity is a prominent health hazard for astronauts, yet we understand little about its effect at the molecular systems level. In this study, we have integrated a set of systems-biology tools and databases and have analysed more than 8000 molecular pathways on published global gene expression datasets of human cells in microgravity. Hundreds of new pathways have been identified with statistical confidence for each dataset and despite the difference in cell types and experiments, around 100 of the new pathways are appeared common across the datasets. They are related to reduced inflammation, autoimmunity, diabetes and asthma. We have identified downregulation of NfκB pathway via Notch1 signalling as new pathway for reduced immunity in microgravity. Induction of few cancer types including liver cancer and leukaemia and increased drug response to cancer in microgravity are also found. Increase in olfactory signal transduction is also identified. Genes, based on their expression pattern, are clustered and mathematically stable clusters are identified. The network mapping of genes within a cluster indicates the plausible functional connections in microgravity. This pipeline gives a new systems level picture of human cells under microgravity, generates testable hypothesis and may help estimating risk and developing medicine for space missions.
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Affiliation(s)
- Sayak Mukhopadhyay
- Biophysics and Structural Genomics Division, Saha Institute of Nuclear Physics, Kolkata, 700064, India
| | - Rohini Saha
- Biophysics and Structural Genomics Division, Saha Institute of Nuclear Physics, Kolkata, 700064, India
| | - Anbarasi Palanisamy
- Biophysics and Structural Genomics Division, Saha Institute of Nuclear Physics, Kolkata, 700064, India
| | - Madhurima Ghosh
- Biophysics and Structural Genomics Division, Saha Institute of Nuclear Physics, Kolkata, 700064, India
| | - Anupriya Biswas
- Department of Biological Sciences, Presidency University, Kolkata, 700073, India
| | - Saheli Roy
- Department of Biological Sciences, Presidency University, Kolkata, 700073, India
| | - Arijit Pal
- Biophysics and Structural Genomics Division, Saha Institute of Nuclear Physics, Kolkata, 700064, India
| | - Kathakali Sarkar
- Biophysics and Structural Genomics Division, Saha Institute of Nuclear Physics, Kolkata, 700064, India
| | - Sangram Bagh
- Biophysics and Structural Genomics Division, Saha Institute of Nuclear Physics, Kolkata, 700064, India
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80
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Cucinotta FA, Cacao E, Alp M. Space Radiation Quality Factors and the Delta Ray Dose and Dose-Rate Reduction Effectiveness Factor. HEALTH PHYSICS 2016; 110:262-266. [PMID: 26808878 DOI: 10.1097/hp.0000000000000442] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this paper, the authors recommend that the dose and dose-rate effectiveness factor used for space radiation risk assessments should be based on a comparison of the biological effects of energetic electrons produced along a cosmic ray particles path in low fluence exposures to high dose-rate gamma-ray exposures of doses of about 1 Gy. Methods to implement this approach are described.
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Affiliation(s)
- Francis A Cucinotta
- * Department of Health Physics and Diagnostic Sciences, University of Nevada, Las Vegas, NV, United States of America
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81
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Locke PA, Weil MM. Personalized Cancer Risk Assessments for Space Radiation Exposures. Front Oncol 2016; 6:38. [PMID: 26942127 PMCID: PMC4762001 DOI: 10.3389/fonc.2016.00038] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 02/05/2016] [Indexed: 11/13/2022] Open
Abstract
Individuals differ in their susceptibility to radiogenic cancers, and there is evidence that this inter-individual susceptibility extends to HZE ion-induced carcinogenesis. Three components of individual risk: sex, age at exposure, and prior tobacco use, are already incorporated into the NASA cancer risk model used to determine safe days in space for US astronauts. Here, we examine other risk factors that could potentially be included in risk calculations. These include personal and family medical history, the presence of pre-malignant cells that could undergo malignant transformation as a consequence of radiation exposure, the results from phenotypic assays of radiosensitivity, heritable genetic polymorphisms associated with radiosensitivity, and postflight monitoring. Inclusion of these additional risk or risk reduction factors has the potential to personalize risk estimates for individual astronauts and could influence the determination of safe days in space. We consider how this type of assessment could be used and explore how the provisions of the federal Genetic Information Non-discrimination Act could impact the collection, dissemination and use of this information by NASA.
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Affiliation(s)
- Paul A Locke
- Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health , Baltimore, MD , USA
| | - Michael M Weil
- Department of Environmental and Radiological Health Sciences, Colorado State University , Fort Collins, CO , USA
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82
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Urbaniak C, Reid G. The potential influence of the microbiota and probiotics on women during long spaceflights. ACTA ACUST UNITED AC 2016; 12:193-8. [PMID: 26901697 DOI: 10.2217/whe.15.101] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Humans have been exploring space for almost 55 years but space travel comes with many psychological and physiological changes that astronauts have to adapt to, both during and post flight missions. Now, with the reality of such missions lasting years, maintaining proper health of the flight crew is a high priority. While conditions such as nausea, bone loss, renal calculi and depression have been recognized, and approaches to medical and surgical care in space considered, the influence of the microbiota could be of added significance in maintaining astronaut health. While probiotics have long been part of the Russian cosmonaut diet, their use for specific health concerns of women has not been assessed. In this article, we explore the ways in which the microbiome may influence the health of female astronauts during long space flights, and present a rationale for the use of probiotics.
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Affiliation(s)
- Camilla Urbaniak
- Lawson Health Research Institute, London, ON, N6A 4V2, Canada.,Department of Microbiology & Immunology, Western University, London, ON, N6A 5C1, Canada
| | - Gregor Reid
- Lawson Health Research Institute, London, ON, N6A 4V2, Canada.,Department of Microbiology & Immunology, Western University, London, ON, N6A 5C1, Canada
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83
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Schreurs AS, Shirazi-Fard Y, Shahnazari M, Alwood JS, Truong TA, Tahimic CGT, Limoli CL, Turner ND, Halloran B, Globus RK. Dried plum diet protects from bone loss caused by ionizing radiation. Sci Rep 2016; 6:21343. [PMID: 26867002 PMCID: PMC4750446 DOI: 10.1038/srep21343] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 01/21/2016] [Indexed: 12/21/2022] Open
Abstract
Bone loss caused by ionizing radiation is a potential health concern for radiotherapy patients, radiation workers and astronauts. In animal studies, exposure to ionizing radiation increases oxidative damage in skeletal tissues, and results in an imbalance in bone remodeling initiated by increased bone-resorbing osteoclasts. Therefore, we evaluated various candidate interventions with antioxidant or anti-inflammatory activities (antioxidant cocktail, dihydrolipoic acid, ibuprofen, dried plum) both for their ability to blunt the expression of resorption-related genes in marrow cells after irradiation with either gamma rays (photons, 2 Gy) or simulated space radiation (protons and heavy ions, 1 Gy) and to prevent bone loss. Dried plum was most effective in reducing the expression of genes related to bone resorption (Nfe2l2, Rankl, Mcp1, Opg, TNF-α) and also preventing later cancellous bone decrements caused by irradiation with either photons or heavy ions. Thus, dietary supplementation with DP may prevent the skeletal effects of radiation exposures either in space or on Earth.
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Affiliation(s)
- A-S Schreurs
- Bone and Signaling Laboratory, Space Biosciences Division, NASA Ames Research Center
| | - Y Shirazi-Fard
- Bone and Signaling Laboratory, Space Biosciences Division, NASA Ames Research Center
| | - M Shahnazari
- Bone and Signaling Laboratory, Space Biosciences Division, NASA Ames Research Center
| | - J S Alwood
- Bone and Signaling Laboratory, Space Biosciences Division, NASA Ames Research Center
| | - T A Truong
- Bone and Signaling Laboratory, Space Biosciences Division, NASA Ames Research Center
| | - C G T Tahimic
- Bone and Signaling Laboratory, Space Biosciences Division, NASA Ames Research Center
| | - C L Limoli
- Department of Radiation Oncology, University of California Irvine
| | - N D Turner
- Department of Nutrition and Food Science, Texas A&M University
| | - B Halloran
- Department of Medicine, Division of Endocrinology, University of California San Francisco
| | - R K Globus
- Bone and Signaling Laboratory, Space Biosciences Division, NASA Ames Research Center
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84
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Hughson RL, Robertson AD, Arbeille P, Shoemaker JK, Rush JWE, Fraser KS, Greaves DK. Increased postflight carotid artery stiffness and inflight insulin resistance resulting from 6-mo spaceflight in male and female astronauts. Am J Physiol Heart Circ Physiol 2016; 310:H628-38. [PMID: 26747504 DOI: 10.1152/ajpheart.00802.2015] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 01/04/2016] [Indexed: 12/25/2022]
Abstract
Removal of the normal head-to-foot gravity vector and chronic weightlessness during spaceflight might induce cardiovascular and metabolic adaptations related to changes in arterial pressure and reduction in physical activity. We tested hypotheses that stiffness of arteries located above the heart would be increased postflight, and that blood biomarkers inflight would be consistent with changes in vascular function. Possible sex differences in responses were explored in four male and four female astronauts who lived on the International Space Station for 6 mo. Carotid artery distensibility coefficient (P = 0.005) and β-stiffness index (P = 0.006) reflected 17-30% increases in arterial stiffness when measured within 38 h of return to Earth compared with preflight. Spaceflight-by-sex interaction effects were found with greater changes in β-stiffness index in women (P = 0.017), but greater changes in pulse wave transit time in men (P = 0.006). Several blood biomarkers were changed from preflight to inflight, including an increase in an index of insulin resistance (P < 0.001) with a spaceflight-by-sex term suggesting greater change in men (P = 0.034). Spaceflight-by-sex interactions for renin (P = 0.016) and aldosterone (P = 0.010) indicated greater increases in women than men. Six-month spaceflight caused increased arterial stiffness. Altered hydrostatic arterial pressure gradients as well as changes in insulin resistance and other biomarkers might have contributed to alterations in arterial properties, including sex differences between male and female astronauts.
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Affiliation(s)
- Richard L Hughson
- Schlegel-University of Waterloo Research Institute for Aging, Waterloo, Ontario, Canada;
| | - Andrew D Robertson
- Schlegel-University of Waterloo Research Institute for Aging, Waterloo, Ontario, Canada
| | - Philippe Arbeille
- Unite Medecine Physiologie Spatiale, CERCOM, EFMP, CHU Trousseau, Tours, France
| | - J Kevin Shoemaker
- School of Kinesiology and Department of Physiology and Pharmacology, University of Western Ontario, London, Ontario, Canada; and
| | - James W E Rush
- Faculty of Applied Health Sciences, University of Waterloo, Waterloo, Ontario
| | - Katelyn S Fraser
- Schlegel-University of Waterloo Research Institute for Aging, Waterloo, Ontario, Canada
| | - Danielle K Greaves
- Schlegel-University of Waterloo Research Institute for Aging, Waterloo, Ontario, Canada
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85
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Datta K, Suman S, Kumar S, Fornace AJ. Colorectal Carcinogenesis, Radiation Quality, and the Ubiquitin-Proteasome Pathway. J Cancer 2016; 7:174-83. [PMID: 26819641 PMCID: PMC4716850 DOI: 10.7150/jca.13387] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 11/01/2015] [Indexed: 12/12/2022] Open
Abstract
Adult colorectal epithelium undergoes continuous renewal and maintains homeostatic balance through regulated cellular proliferation, differentiation, and migration. The canonical Wnt signaling pathway involving the transcriptional co-activator β-catenin is important for colorectal development and normal epithelial maintenance, and deregulated Wnt/β-catenin signaling has been implicated in colorectal carcinogenesis. Colorectal carcinogenesis has been linked to radiation exposure, and radiation has been demonstrated to alter Wnt/β-catenin signaling, as well as the proteasomal pathway involved in the degradation of the signaling components and thus regulation of β-catenin. The current review discusses recent progresses in our understanding of colorectal carcinogenesis in relation to different types of radiation and roles that radiation quality plays in deregulating β-catenin and ubiquitin-proteasome pathway (UPP) for colorectal cancer initiation and progression.
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Affiliation(s)
- Kamal Datta
- 1. Department of Biochemistry and Molecular & Cellular Biology and Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC USA
| | - Shubhankar Suman
- 1. Department of Biochemistry and Molecular & Cellular Biology and Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC USA
| | - Santosh Kumar
- 1. Department of Biochemistry and Molecular & Cellular Biology and Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC USA
| | - Albert J Fornace
- 1. Department of Biochemistry and Molecular & Cellular Biology and Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC USA.; 2. Center of Excellence in Genomic Medicine Research (CEGMR), King Abdulaziz University, Jeddah, Saudi Arabia
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86
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The potential use of biogas producing microorganisms in radiation protection. JOURNAL OF MEDICAL HYPOTHESES AND IDEAS 2015. [DOI: 10.1016/j.jmhi.2015.04.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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87
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Suman S, Kumar S, Fornace AJ, Datta K. Decreased RXRα is Associated with Increased β-Catenin/TCF4 in (56)Fe-Induced Intestinal Tumors. Front Oncol 2015; 5:218. [PMID: 26500891 PMCID: PMC4597120 DOI: 10.3389/fonc.2015.00218] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 09/23/2015] [Indexed: 12/31/2022] Open
Abstract
Although it is known that accumulation of oncogenic β-catenin is critical for intestinal tumorigenesis, the underlying mechanisms have not yet been fully explored. Post-translational β-catenin level is regulated via the adenomatous polyposis coli (APC)-dependent as well as the APC-independent ubiquitin–proteasome pathway (UPP). Employing an APC-mutant mouse model (APCMin/+) the present study aimed to investigate the status of RXRα, an APC-independent factor involved in targeting β-catenin to UPP for degradation, in tumor-bearing and tumor-free areas of intestine after exposure to energetic 56Fe ions. APCMin/+ mice were exposed to energetic 56Fe ions (4 or 1.6 Gy) and intestinal tumor samples and tumor-free normal intestinal samples were collected 100–110 days after exposure. The status of TCF4, β-catenin, cyclin D1, and RXRα was examined using immunohistochemistry and immunoblots. We observed increased accumulation of the transcription factor TCF4 and its co-activator β-catenin as well as their downstream oncogenic target protein cyclin-D1 in 56Fe ion-induced intestinal tumors. Further, decreased expression of RXRα in tumors as well as in adjacent normal epithelium was indicative of perturbations in β-catenin proteasomal-targeting machinery. This indicates that decreased UPP targeting of β-catenin due to downregulation of RXRα can contribute to further accumulation of β-catenin and to 56Fe-induced tumorigenesis.
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Affiliation(s)
- Shubhankar Suman
- Department of Biochemistry and Molecular and Cellular Biology, Lombardi Comprehensive Cancer Center, Georgetown University , Washington, DC , USA
| | - Santosh Kumar
- Department of Biochemistry and Molecular and Cellular Biology, Lombardi Comprehensive Cancer Center, Georgetown University , Washington, DC , USA
| | - Albert J Fornace
- Department of Biochemistry and Molecular and Cellular Biology, Lombardi Comprehensive Cancer Center, Georgetown University , Washington, DC , USA ; Center of Excellence in Genomic Medicine Research (CEGMR), King Abdulaziz University , Jeddah , Saudi Arabia
| | - Kamal Datta
- Department of Biochemistry and Molecular and Cellular Biology, Lombardi Comprehensive Cancer Center, Georgetown University , Washington, DC , USA
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88
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Fleenor CJ, Higa K, Weil MM, DeGregori J. Evolved Cellular Mechanisms to Respond to Genotoxic Insults: Implications for Radiation-Induced Hematologic Malignancies. Radiat Res 2015; 184:341-51. [PMID: 26414506 DOI: 10.1667/rr14147.1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Human exposure to ionizing radiation is highly associated with adverse health effects, including reduced hematopoietic cell function and increased risk of carcinogenesis. The hematopoietic deficits manifest across blood cell types and persist for years after radiation exposure, suggesting a long-lived and multi-potent cellular reservoir for radiation-induced effects. As such, research has focused on identifying both the immediate and latent hematopoietic stem cell responses to radiation exposure. Radiation-associated effects on hematopoietic function and malignancy development have generally been attributed to the direct induction of mutations resulting from radiation-induced DNA damage. Other studies have illuminated the role of cellular programs that both limit and enhance radiation-induced tissue phenotypes and carcinogenesis. In this review, distinct but collaborative cellular responses to genotoxic insults are highlighted, with an emphasis on how these programmed responses impact hematopoietic cellular fitness and competition. These radiation-induced cellular programs include apoptosis, senescence and impaired self-renewal within the hematopoietic stem cell (HSC) pool. In the context of sporadic DNA damage to a cell, these cellular responses act in concert to restore tissue function and prevent selection for adaptive oncogenic mutations. But in the contexts of whole-tissue exposure or whole-body exposure to genotoxins, such as radiotherapy or chemotherapy, we propose that these programs can contribute to long-lasting tissue impairment and increased carcinogenesis.
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Affiliation(s)
| | | | - Michael M Weil
- d Department of Environmental and Radiological Health Sciences, Colorado State University; Fort Collins, Colorado
| | - James DeGregori
- Departments of a Immunology.,b Biochemistry and Molecular Genetics and.,c Medicine, School of Medicine, University of Colorado, Aurora, Colorado; and
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89
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Cucinotta FA. Biophysics of NASA radiation quality factors. RADIATION PROTECTION DOSIMETRY 2015; 166:282-289. [PMID: 25883309 DOI: 10.1093/rpd/ncv144] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
NASA has implemented new radiation quality factors (QFs) for projecting cancer risks from space radiation exposures to astronauts. The NASA QFs are based on particle track structure concepts with parameters derived from available radiobiology data, and NASA introduces distinct QFs for solid cancer and leukaemia risk estimates. The NASA model was reviewed by the US National Research Council and approved for use by NASA for risk assessment for International Space Station missions and trade studies of future exploration missions to Mars and other destinations. A key feature of the NASA QFs is to represent the uncertainty in the QF assessments and evaluate the importance of the QF uncertainty to overall uncertainties in cancer risk projections. In this article, the biophysical basis for the probability distribution functions representing QF uncertainties was reviewed, and approaches needed to reduce uncertainties were discussed.
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Affiliation(s)
- Francis A Cucinotta
- Health Physics and Diagnostic Sciences, University of Nevada Las Vegas, 4505 Maryland Parkway, Box 453037, Las Vegas, NV 89154-3037, USA
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90
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Affiliation(s)
- Charles Limoli
- University of California, Irvine, Irvine, California 92697-2695
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91
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Kim MHY, Rusek A, Cucinotta FA. Issues for Simulation of Galactic Cosmic Ray Exposures for Radiobiological Research at Ground-Based Accelerators. Front Oncol 2015; 5:122. [PMID: 26090339 PMCID: PMC4455530 DOI: 10.3389/fonc.2015.00122] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 05/17/2015] [Indexed: 01/04/2023] Open
Abstract
For radiobiology research on the health risks of galactic cosmic rays (GCR) ground-based accelerators have been used with mono-energetic beams of single high charge, Z and energy, E (HZE) particles. In this paper, we consider the pros and cons of a GCR reference field at a particle accelerator. At the NASA Space Radiation Laboratory (NSRL), we have proposed a GCR simulator, which implements a new rapid switching mode and higher energy beam extraction to 1.5 GeV/u, in order to integrate multiple ions into a single simulation within hours or longer for chronic exposures. After considering the GCR environment and energy limitations of NSRL, we performed extensive simulation studies using the stochastic transport code, GERMcode (GCR Event Risk Model) to define a GCR reference field using 9 HZE particle beam-energy combinations each with a unique absorber thickness to provide fragmentation and 10 or more energies of proton and (4)He beams. The reference field is shown to well represent the charge dependence of GCR dose in several energy bins behind shielding compared to a simulated GCR environment. However, a more significant challenge for space radiobiology research is to consider chronic GCR exposure of up to 3 years in relation to simulations with animal models of human risks. We discuss issues in approaches to map important biological time scales in experimental models using ground-based simulation, with extended exposure of up to a few weeks using chronic or fractionation exposures. A kinetics model of HZE particle hit probabilities suggests that experimental simulations of several weeks will be needed to avoid high fluence rate artifacts, which places limitations on the experiments to be performed. Ultimately risk estimates are limited by theoretical understanding, and focus on improving knowledge of mechanisms and development of experimental models to improve this understanding should remain the highest priority for space radiobiology research.
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Affiliation(s)
- Myung-Hee Y Kim
- Wyle Science, Technology and Engineering Group , Houston, TX , USA
| | - Adam Rusek
- Brookhaven National Laboratory , Upton, NY , USA
| | - Francis A Cucinotta
- Department of Health Physics and Diagnostic Sciences, University of Nevada Las Vegas , Las Vegas, NV , USA
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92
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Cucinotta FA, Alp M, Rowedder B, Kim MHY. Safe days in space with acceptable uncertainty from space radiation exposure. LIFE SCIENCES IN SPACE RESEARCH 2015; 5:31-38. [PMID: 26177847 DOI: 10.1016/j.lssr.2015.04.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 04/06/2015] [Accepted: 04/07/2015] [Indexed: 06/04/2023]
Abstract
The prediction of the risks of cancer and other late effects from space radiation exposure carries large uncertainties mostly due to the lack of information on the risks from high charge and energy (HZE) particles and other high linear energy transfer (LET) radiation. In our recent work new methods were used to consider NASA's requirement to protect against the acceptable risk of no more than 3% probability of cancer fatality estimated at the 95% confidence level. Because it is not possible that a zero-level of uncertainty could be achieved, we suggest that an acceptable uncertainty level should be defined in relationship to a probability distribution function (PDF) that only suffers from modest skewness with higher uncertainty allowed for a normal PDF. In this paper, we evaluate PDFs and the number or "safe days" in space, which are defined as the mission length where risk limits are not exceeded, for several mission scenarios at different acceptable levels of uncertainty. In addition, we briefly discuss several important issues in risk assessment including non-cancer effects, the distinct tumor spectra and lethality found in animal experiments for HZE particles compared to background or low LET radiation associated tumors, and the possibility of non-targeted effects (NTE) modifying low dose responses and increasing relative biological effectiveness (RBE) factors for tumor induction. Each of these issues skew uncertainty distributions to higher fatality probabilities with the potential to increase central values of risk estimates in the future. Therefore they will require significant research efforts to support space exploration within acceptable levels of risk and uncertainty.
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Affiliation(s)
- Francis A Cucinotta
- Department of Health Physics and Diagnostic Sciences, University of Nevada, Las Vegas, NV, USA.
| | - Murat Alp
- Department of Health Physics and Diagnostic Sciences, University of Nevada, Las Vegas, NV, USA
| | - Blake Rowedder
- Department of Health Physics and Diagnostic Sciences, University of Nevada, Las Vegas, NV, USA
| | - Myung-Hee Y Kim
- Wyle Science, Technology and Engineering Group, Houston, TX 77058, USA
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93
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Cucinotta FA. A new approach to reduce uncertainties in space radiation cancer risk predictions. PLoS One 2015; 10:e0120717. [PMID: 25789764 PMCID: PMC4366386 DOI: 10.1371/journal.pone.0120717] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 01/26/2015] [Indexed: 02/06/2023] Open
Abstract
The prediction of space radiation induced cancer risk carries large uncertainties with two of the largest uncertainties being radiation quality and dose-rate effects. In risk models the ratio of the quality factor (QF) to the dose and dose-rate reduction effectiveness factor (DDREF) parameter is used to scale organ doses for cosmic ray proton and high charge and energy (HZE) particles to a hazard rate for γ-rays derived from human epidemiology data. In previous work, particle track structure concepts were used to formulate a space radiation QF function that is dependent on particle charge number Z, and kinetic energy per atomic mass unit, E. QF uncertainties where represented by subjective probability distribution functions (PDF) for the three QF parameters that described its maximum value and shape parameters for Z and E dependences. Here I report on an analysis of a maximum QF parameter and its uncertainty using mouse tumor induction data. Because experimental data for risks at low doses of γ-rays are highly uncertain which impacts estimates of maximum values of relative biological effectiveness (RBEmax), I developed an alternate QF model, denoted QFγAcute where QFs are defined relative to higher acute γ-ray doses (0.5 to 3 Gy). The alternate model reduces the dependence of risk projections on the DDREF, however a DDREF is still needed for risk estimates for high-energy protons and other primary or secondary sparsely ionizing space radiation components. Risk projections (upper confidence levels (CL)) for space missions show a reduction of about 40% (CL∼50%) using the QFγAcute model compared the QFs based on RBEmax and about 25% (CL∼35%) compared to previous estimates. In addition, I discuss how a possible qualitative difference leading to increased tumor lethality for HZE particles compared to low LET radiation and background tumors remains a large uncertainty in risk estimates.
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Affiliation(s)
- Francis A. Cucinotta
- Department of Health Physics and Diagnostic Sciences, University of Nevada, Las Vegas, Nevada, United States of America
- * E-mail:
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94
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Cucinotta FA. Review of NASA approach to space radiation risk assessments for Mars exploration. HEALTH PHYSICS 2015; 108:131-142. [PMID: 25551493 DOI: 10.1097/hp.0000000000000255] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Long duration space missions present unique radiation protection challenges due to the complexity of the space radiation environment, which includes high charge and energy particles and other highly ionizing radiation such as neutrons. Based on a recommendation by the National Council on Radiation Protection and Measurements, a 3% lifetime risk of exposure-induced death for cancer has been used as a basis for risk limitation by the National Aeronautics and Space Administration (NASA) for low-Earth orbit missions. NASA has developed a risk-based approach to radiation exposure limits that accounts for individual factors (age, gender, and smoking history) and assesses the uncertainties in risk estimates. New radiation quality factors with associated probability distribution functions to represent the quality factor's uncertainty have been developed based on track structure models and recent radiobiology data for high charge and energy particles. The current radiation dose limits are reviewed for spaceflight and the various qualitative and quantitative uncertainties that impact the risk of exposure-induced death estimates using the NASA Space Cancer Risk (NSCR) model. NSCR estimates of the number of "safe days" in deep space to be within exposure limits and risk estimates for a Mars exploration mission are described.
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Affiliation(s)
- Francis A Cucinotta
- *University of Nevada, Las Vegas. Department of Health Physics and Diagnostic Sciences, 4505 S. Maryland Parkway, Box 453037, Las Vegas NV, 89154-3037
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95
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Wang X, Farris III AB, Wang P, Zhang X, Wang H, Wang Y. Relative Effectiveness at 1 Gy after Acute and Fractionated Exposures of Heavy Ions with Different Linear Energy Transfer for Lung Tumorigenesis. Radiat Res 2015; 183:233-9. [DOI: 10.1667/rr13884.1] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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96
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Bouville A, Toohey RE, Boice JD, Beck HL, Dauer LT, Eckerman KF, Hagemeyer D, Leggett RW, Mumma MT, Napier B, Pryor KH, Rosenstein M, Schauer DA, Sherbini S, Stram DO, Thompson JL, Till JE, Yoder C, Zeitlin C. Dose reconstruction for the million worker study: status and guidelines. HEALTH PHYSICS 2015; 108:206-20. [PMID: 25551504 PMCID: PMC4854640 DOI: 10.1097/hp.0000000000000231] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The primary aim of the epidemiologic study of one million U.S. radiation workers and veterans [the Million Worker Study (MWS)] is to provide scientifically valid information on the level of radiation risk when exposures are received gradually over time and not within seconds, as was the case for Japanese atomic bomb survivors. The primary outcome of the epidemiologic study is cancer mortality, but other causes of death such as cardiovascular disease and cerebrovascular disease will be evaluated. The success of the study is tied to the validity of the dose reconstruction approaches to provide realistic estimates of organ-specific radiation absorbed doses that are as accurate and precise as possible and to properly evaluate their accompanying uncertainties. The dosimetry aspects for the MWS are challenging in that they address diverse exposure scenarios for diverse occupational groups being studied over a period of up to 70 y. The dosimetric issues differ among the varied exposed populations that are considered: atomic veterans, U.S. Department of Energy workers exposed to both penetrating radiation and intakes of radionuclides, nuclear power plant workers, medical radiation workers, and industrial radiographers. While a major source of radiation exposure to the study population comes from external gamma- or x-ray sources, for some of the study groups, there is a meaningful component of radionuclide intakes that requires internal radiation dosimetry assessments. Scientific Committee 6-9 has been established by the National Council on Radiation Protection and Measurements (NCRP) to produce a report on the comprehensive organ dose assessment (including uncertainty analysis) for the MWS. The NCRP dosimetry report will cover the specifics of practical dose reconstruction for the ongoing epidemiologic studies with uncertainty analysis discussions and will be a specific application of the guidance provided in NCRP Report Nos. 158, 163, 164, and 171. The main role of the Committee is to provide guidelines to the various groups of dosimetrists involved in the MWS to ensure that certain dosimetry criteria are considered: calculation of annual absorbed doses in the organs of interest, separation of low and high linear-energy transfer components, evaluation of uncertainties, and quality assurance and quality control. It is recognized that the MWS and its approaches to dosimetry are a work in progress and that there will be flexibility and changes in direction as new information is obtained with regard to both dosimetry and the epidemiologic features of the study components. This paper focuses on the description of the various components of the MWS, the available dosimetry results, and the challenges that have been encountered. It is expected that the Committee will complete its report in 2016.
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Affiliation(s)
- André Bouville
- National Cancer Institute (retired), 9609 Medical Center Drive, Room 7E590, MSC 9778, Rockville, MD, 20850, Telephone: 240-276-7416, Fax: 240-276-7840
| | | | - John D. Boice
- National Council on Radiation Protection and Measurements, Bethesda, Maryland
| | | | - Larry T. Dauer
- Memorial Sloan Kettering Cancer Center, New York, New York
| | | | | | | | | | - Bruce Napier
- Pacific Northwest National Laboratory, Richland, Washington
| | - Kathy H. Pryor
- Pacific Northwest National Laboratory, Richland, Washington
| | | | - David A. Schauer
- National Council on Radiation Protection and Measurements, Bethesda, Maryland
| | | | | | | | - John E. Till
- Risk Assessment Corporation, Neeses, South Carolina
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97
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Sridharan DM, Asaithamby A, Bailey SM, Costes SV, Doetsch PW, Dynan WS, Kronenberg A, Rithidech KN, Saha J, Snijders AM, Werner E, Wiese C, Cucinotta FA, Pluth JM. Understanding cancer development processes after HZE-particle exposure: roles of ROS, DNA damage repair and inflammation. Radiat Res 2015; 183:1-26. [PMID: 25564719 DOI: 10.1667/rr13804.1] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
During space travel astronauts are exposed to a variety of radiations, including galactic cosmic rays composed of high-energy protons and high-energy charged (HZE) nuclei, and solar particle events containing low- to medium-energy protons. Risks from these exposures include carcinogenesis, central nervous system damage and degenerative tissue effects. Currently, career radiation limits are based on estimates of fatal cancer risks calculated using a model that incorporates human epidemiological data from exposed populations, estimates of relative biological effectiveness and dose-response data from relevant mammalian experimental models. A major goal of space radiation risk assessment is to link mechanistic data from biological studies at NASA Space Radiation Laboratory and other particle accelerators with risk models. Early phenotypes of HZE exposure, such as the induction of reactive oxygen species, DNA damage signaling and inflammation, are sensitive to HZE damage complexity. This review summarizes our current understanding of critical areas within the DNA damage and oxidative stress arena and provides insight into their mechanistic interdependence and their usefulness in accurately modeling cancer and other risks in astronauts exposed to space radiation. Our ultimate goals are to examine potential links and crosstalk between early response modules activated by charged particle exposure, to identify critical areas that require further research and to use these data to reduced uncertainties in modeling cancer risk for astronauts. A clearer understanding of the links between early mechanistic aspects of high-LET response and later surrogate cancer end points could reveal key nodes that can be therapeutically targeted to mitigate the health effects from charged particle exposures.
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Affiliation(s)
- D M Sridharan
- a Lawrence Berkeley National Laboratory, Berkeley, California
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98
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Weil MM, Ray FA, Genik PC, Yu Y, McCarthy M, Fallgren CM, Ullrich RL. Effects of 28Si ions, 56Fe ions, and protons on the induction of murine acute myeloid leukemia and hepatocellular carcinoma. PLoS One 2014; 9:e104819. [PMID: 25126721 PMCID: PMC4134239 DOI: 10.1371/journal.pone.0104819] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Accepted: 07/17/2014] [Indexed: 11/17/2022] Open
Abstract
Estimates of cancer risks posed to space-flight crews by exposure to high atomic number, high-energy (HZE) ions are subject to considerable uncertainty because epidemiological data do not exist for human populations exposed to similar radiation qualities. We assessed the carcinogenic effects of 300 MeV/n 28Si or 600 MeV/n 56Fe ions in a mouse model for radiation-induced acute myeloid leukemia and hepatocellular carcinoma. C3H/HeNCrl mice were irradiated with 0.1, 0.2, 0.4, or 1 Gy of 300 MeV/n 28Si ions, 600 MeV/n 56Fe ions or 1 or 2 Gy of protons simulating the 1972 solar particle event (1972SPE) at the NASA Space Radiation Laboratory. Additional mice were irradiated with 137Cs gamma rays at doses of 1, 2, or 3 Gy. All groups were followed until they were moribund or reached 800 days of age. We found that 28Si or 56Fe ions do not appear to be substantially more effective than gamma rays for the induction of acute myeloid leukemia. However, 28Si or 56Fe ion irradiated mice had a much higher incidence of hepatocellular carcinoma than gamma ray irradiated or proton irradiated mice. These data demonstrate a clear difference in the effects of these HZE ions on the induction of leukemia compared to solid tumors, suggesting potentially different mechanisms of tumorigenesis. Also seen in this study was an increase in metastatic hepatocellular carcinoma in the 28Si and 56Fe ion irradiated mice compared with those exposed to gamma rays or 1972SPE protons, a finding with important implications for setting radiation exposure limits for space-flight crew members.
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Affiliation(s)
- Michael M Weil
- Colorado State University, Fort Collins, Colorado, United States of America
| | - F Andrew Ray
- Colorado State University, Fort Collins, Colorado, United States of America
| | - Paula C Genik
- Colorado State University, Fort Collins, Colorado, United States of America
| | - Yongjia Yu
- University of Texas Medical Branch, Galveston, Texas, United States of America
| | - Maureen McCarthy
- University of Texas Medical Branch, Galveston, Texas, United States of America
| | | | - Robert L Ullrich
- University of Texas Medical Branch, Galveston, Texas, United States of America
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99
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DeCarolis NA, Rivera PD, Ahn F, Amaral WZ, LeBlanc JA, Malhotra S, Shih HY, Petrik D, Melvin N, Chen BP, Eisch AJ. 56Fe Particle Exposure Results in a Long-Lasting Increase in a Cellular Index of Genomic Instability and Transiently Suppresses Adult Hippocampal Neurogenesis in Vivo. LIFE SCIENCES IN SPACE RESEARCH 2014; 2:70-79. [PMID: 25170435 PMCID: PMC4142527 DOI: 10.1016/j.lssr.2014.06.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The high-LET HZE particles from galactic cosmic radiation pose tremendous health risks to astronauts, as they may incur sub-threshold brain injury or maladaptations that may lead to cognitive impairment. The health effects of HZE particles are difficult to predict and unfeasible to prevent. This underscores the importance of estimating radiation risks to the central nervous system as a whole as well as to specific brain regions like the hippocampus, which is central to learning and memory. Given that neurogenesis in the hippocampus has been linked to learning and memory, we investigated the response and recovery of neurogenesis and neural stem cells in the adult mouse hippocampal dentate gyrus after HZE particle exposure using two nestin transgenic reporter mouse lines to label and track radial glia stem cells (Nestin-GFP and Nestin-CreERT2/R26R:YFP mice, respectively). Mice were subjected to 56Fe particle exposure (0 or 1 Gy, at either 300 or 1000 MeV/n) and brains were harvested at early (24h), intermediate (7d), and/or long time points (2-3mo) post-irradiation. 56Fe particle exposure resulted in a robust increase in 53BP1+ foci at both the intermediate and long time points post-irradiation, suggesting long-term genomic instability in the brain. However, 56Fe particle exposure only produced a transient decrease in immature neuron number at the intermediate time point, with no significant decrease at the long time point post-irradiation. 56Fe particle exposure similarly produced a transient decrease in dividing progenitors, with fewer progenitors labeled at the early time point but equal number labeled at the intermediate time point, suggesting a recovery of neurogenesis. Notably, 56Fe particle exposure did not change the total number of nestin-expressing neural stem cells. These results highlight that despite the persistence of an index of genomic instability, 56Fe particle-induced deficits in adult hippocampal neurogenesis may be transient. These data support the regenerative capacity of the adult SGZ after HZE particle exposure and encourage additional inquiry into the relationship between radial glia stem cells and cognitive function after HZE particle exposure.
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Affiliation(s)
| | | | - Francisca Ahn
- Dept Radiation Oncology, UT Southwestern Medical Center, Dallas, TX, USA
| | | | - Junie A. LeBlanc
- Dept Psychiatry, UT Southwestern Medical Center, Dallas, TX, USA
| | - Shveta Malhotra
- Dept Psychiatry, UT Southwestern Medical Center, Dallas, TX, USA
| | - Hung-Ying Shih
- Dept Radiation Oncology, UT Southwestern Medical Center, Dallas, TX, USA
| | - David Petrik
- Dept Psychiatry, UT Southwestern Medical Center, Dallas, TX, USA
| | - Neal Melvin
- Dept Psychiatry, UT Southwestern Medical Center, Dallas, TX, USA
| | - Benjamin P.C. Chen
- Dept Radiation Oncology, UT Southwestern Medical Center, Dallas, TX, USA
- Co-Corresponding Authors: Amelia J. Eisch, Department of Psychiatry, UT Southwestern Medical Center, Dallas, TX 75390-9070. . Benjamin P. C. Chen, Department of Radiation Oncology, UT Southwestern Medical Center, Dallas, TX 75390-9187.
| | - Amelia J. Eisch
- Dept Psychiatry, UT Southwestern Medical Center, Dallas, TX, USA
- Co-Corresponding Authors: Amelia J. Eisch, Department of Psychiatry, UT Southwestern Medical Center, Dallas, TX 75390-9070. . Benjamin P. C. Chen, Department of Radiation Oncology, UT Southwestern Medical Center, Dallas, TX 75390-9187.
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