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Meenakshi C, Venkatachalam P, Chandrasekaran S, Venkatraman B. Construction of dose response curve for 6 MV LINAC X-rays using Premature Chromosome Condensation assay for radiation dosimetry. Appl Radiat Isot 2021; 173:109729. [PMID: 33906115 DOI: 10.1016/j.apradiso.2021.109729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 03/28/2021] [Accepted: 04/09/2021] [Indexed: 10/21/2022]
Abstract
Quantification of chromosomal aberrations in the exposed personnel blood samples is considered as a 'gold standard' and sensitive biomarker in biological dosimetry. Despite technological developments, culture of cells for 48-52 h remains an unmet need in case of triage biodosimetry. Moreover, it is difficult to get sufficient number of metaphase spreads for scoring after high doses of exposures. The technique which causes condensation of chromatin before mitosis using biological or chemical agent is named as Premature Chromosome Condensation (PCC) assay. This assay is considered as an alternative to chromosome aberration assay, particularly at high acute doses of low and high LET radiation. To establish the PCC assay, blood samples were collected from healthy non-smoking individuals (n = 3) and exposed to various doses (0-20 Gy) of 6 MV X-rays at a dose rate of 5.6 Gy/min, using a high energy Linear accelerator (LINAC). Irradiated blood samples were subjected to Calyculin-A induced PCC. About 500 cells or more than 100 Ring Chromosomes (RC) were scored at each dose. Dicentric chromosomes (DC) and acentric fragments were also scored at each dose; the number of chromosomal aberrations in G1, M, G2/M and M/A phase of cell cycle were recorded and the frequency was used to construct the dose response curve. A dose dependent increase in RC and DC frequency were observed with a slope of 0.049 ± 0.002 and 0.30 ± 0.02 respectively. This study is first of its kind to construct a dose response curve for LINAC X-rays using a PCC assay.
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Affiliation(s)
- C Meenakshi
- Human Genetics Department, Sri Ramachandra Institute of Higher Education and Research, Chennai, Tamilnadu, India
| | - P Venkatachalam
- Human Genetics Department, Sri Ramachandra Institute of Higher Education and Research, Chennai, Tamilnadu, India.
| | - S Chandrasekaran
- Health, Safety and Environmental Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu, India
| | - B Venkatraman
- Health, Safety and Environmental Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamilnadu, India
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Klokov D. Plasma levels of serum amyloid A1 and mortality after exposure to high-dose radiation. ANNALS OF TRANSLATIONAL MEDICINE 2020; 8:661. [PMID: 32617281 PMCID: PMC7327329 DOI: 10.21037/atm.2020.03.172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Dmitry Klokov
- Laboratory of Radiobiology and Radiotoxicology, Department of Research on Biological and Health Effects of Ionizing Radiation, Institute of Radioprotection and Nuclear Safety (IRSN), Fontenay-aux-Roses, France.,Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada
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Blimark M, Örtenwall P, Lönroth H, Mattsson P, Boffard KD, Robinson Y. Swedish emergency hospital surgical surge capacity to mass casualty incidents. Scand J Trauma Resusc Emerg Med 2020; 28:12. [PMID: 32093761 PMCID: PMC7038541 DOI: 10.1186/s13049-020-0701-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 01/13/2020] [Indexed: 11/28/2022] Open
Abstract
Background In Sweden the surgical surge capacity for mass casualty incidents (MCI) is managed by county councils within their dedicated budget. It is unclear whether healthcare budget constraints have affected the regional MCI preparedness. This study was designed to investigate the current surgical MCI preparedness at Swedish emergency hospitals. Methods Surveys were distributed in 2015 to department heads of intensive care units (ICU) and surgery at 54 Swedish emergency hospitals. The survey contained quantitative measures as the number of (1) surgical trauma teams in hospital and available after activating the disaster plan, (2) surgical theatres suitable for multi-trauma care, and (3) surgical ICU beds. The survey was also distributed to the Armed Forces Centre for Defence Medicine. Results 53 hospitals responded to the survey (98%). Included were 10 university hospitals (19%), 42 county hospitals (79%), and 1 private hospital (2%). Within 8 h the surgical capacity could be increased from 105 to 399 surgical teams, while 433 surgical theatres and 480 ICU beds were made available. The surgical surge capacity differed between university hospitals and county hospitals, and regional differences were identified regarding the availability of surgical theatres and ICU beds. Conclusions The MCI preparedness of Swedish emergency care hospitals needs further attention. To improve Swedish surgical MCI preparedness a national strategy for trauma care in disaster management is necessary.
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Affiliation(s)
- Magnus Blimark
- Institute of Clinical Sciences, Sahlgrenska Academy, Gothenburg University, 413 45, Gothenburg, Sweden. .,Swedish Armed Forces Centre for Defence Medicine, Gothenburg, Sweden.
| | - Per Örtenwall
- Institute of Clinical Sciences, Sahlgrenska Academy, Gothenburg University, 413 45, Gothenburg, Sweden.,Swedish Armed Forces Centre for Defence Medicine, Gothenburg, Sweden
| | - Hans Lönroth
- Swedish Armed Forces Centre for Defence Medicine, Gothenburg, Sweden
| | - Peter Mattsson
- Department of Military Studies, Swedish Defence University, Stockholm, Sweden
| | - Kenneth D Boffard
- Institute of Clinical Sciences, Sahlgrenska Academy, Gothenburg University, 413 45, Gothenburg, Sweden
| | - Yohan Robinson
- Institute of Clinical Sciences, Sahlgrenska Academy, Gothenburg University, 413 45, Gothenburg, Sweden.,Swedish Armed Forces Centre for Defence Medicine, Gothenburg, Sweden
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Rudqvist N, Laiakis EC, Ghandhi SA, Kumar S, Knotts JD, Chowdhury M, Fornace AJ, Amundson SA. Global Gene Expression Response in Mouse Models of DNA Repair Deficiency after Gamma Irradiation. Radiat Res 2018; 189:337-344. [PMID: 29351057 DOI: 10.1667/rr14862.1] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In the event of an improvised nuclear device or "dirty bomb" in a highly populated area, potentially hundreds of thousands of people will require screening to ensure that exposed individuals receive appropriate treatment. For this reason, there is a need to develop tools for high-throughput radiation biodosimetry. Gene expression represents an emerging approach to biodosimetry and could potentially provide an estimate of both absorbed dose and individual radiation-induced injury. Since approximately 2-4% of humans are thought to be radiosensitive, and would suffer greater radiological injury at a given dose than members of the general population, it is of interest to explore the potential impact of such sensitivity on the biodosimetric gene expression signatures being developed. In this study, we used wild-type mice and genetically engineered mouse models deficient in two DNA repair pathways that can contribute to radiation sensitivity to estimate the maximum effect of differences in radiosensitivity. We compared gene expression in response to a roughly equitoxic (LD50/30) dose of gamma rays in wild-type C57BL/6 (8 Gy) and DNA double-strand break repair-deficient Atm-/- (4 Gy) and Prkdcscid (3 Gy) mutants of C57BL/6. Overall, 780 genes were significantly differentially expressed in wild-type mice one day postirradiation, 232 in Atm-/- and 269 in Prkdcscid. Upstream regulators including TP53 and NFκB were predicted to be activated by radiation exposure in the wild-type mice, but not in either of the DNA repair-deficient mutant strains. There was also a significant muting of the apparent inflammatory response triggered by radiation in both mutant strains. These differences impacted the ability of gene expression signatures developed in wild-type mice to detect potentially fatal radiation exposure in the DNA repair-deficient mice, with the greatest impact on Atm-/- mice. However, the inclusion of mutant mice in gene selection vastly improved performance of the classifiers.
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Affiliation(s)
- Nils Rudqvist
- a Center for Radiological Research, Columbia University Medical Center, Columbia University, New York, New York
| | - Evagelia C Laiakis
- b Department of Biochemistry and Molecular and Cellular Biology, Georgetown University, Washington, DC
| | - Shanaz A Ghandhi
- a Center for Radiological Research, Columbia University Medical Center, Columbia University, New York, New York
| | - Suresh Kumar
- a Center for Radiological Research, Columbia University Medical Center, Columbia University, New York, New York
| | - Jeffrey D Knotts
- a Center for Radiological Research, Columbia University Medical Center, Columbia University, New York, New York
| | - Mashkura Chowdhury
- a Center for Radiological Research, Columbia University Medical Center, Columbia University, New York, New York
| | - Albert J Fornace
- b Department of Biochemistry and Molecular and Cellular Biology, Georgetown University, Washington, DC
| | - Sally A Amundson
- a Center for Radiological Research, Columbia University Medical Center, Columbia University, New York, New York
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The evaluation of readiness of medical personnel to act under conditions of chemical contamination. Disaster Med Public Health Prep 2014; 8:297-300. [PMID: 24932659 DOI: 10.1017/dmp.2014.52] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
OBJECTIVE We evaluated the knowledge of physicians, nurses, and paramedics in Poland about the procedures in a chemical contamination. METHODS An anonymous survey was mailed to 600 randomly selected physicians, nurses, and paramedics. The survey included questions concerning the process of decontamination, knowledge of toxidromes, and the use of selected antidotes. RESULTS Completed surveys were received from 510 respondents (85%). A very low level of knowledge was observed regarding decontamination techniques (from 8.3% to 34.2%), use of antidotes (from 13.7% to 61%), and knowledge of toxidromes (from 10.2% to 22.7%). CONCLUSIONS Our findings showed that for all aspects of chemical rescue procedures queried, the knowledge of medical personnel was not satisfactory. Both practical and theoretical training of medical personnel is urgently needed for life-saving procedures during a chemical contamination.
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Levêque P, Desmet C, Dos Santos-Goncalvez AM, Beun S, Leprince JG, Leloup G, Gallez B. Influence of free radicals signal from dental resins on the radio-induced signal in teeth in EPR retrospective dosimetry. PLoS One 2013; 8:e62225. [PMID: 23704875 PMCID: PMC3660527 DOI: 10.1371/journal.pone.0062225] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Accepted: 03/19/2013] [Indexed: 11/27/2022] Open
Abstract
In case of radiological accident, retrospective dosimetry is needed to reconstruct the absorbed dose of overexposed individuals not wearing personal dosimeters at the onset of the incident. In such a situation, emergency mass triage will be required. In this context, it has been shown that Electron Paramagnetic Resonance (EPR) spectroscopy would be a rapid and sensitive method, on the field deployable system, allowing dose evaluation of a great number of people in a short time period. This methodology uses tooth enamel as a natural dosimeter. Ionising radiations create stable free radicals in the enamel, in a dose dependent manner, which can be detected by EPR directly in the mouth with an appropriate resonator. Teeth are often subject to restorations, currently made of synthetic dimethacrylate-based photopolymerizable composites. It is known that some dental composites give an EPR signal which is likely to interfere with the dosimetric signal from the enamel. So far, no information was available about the occurrence of this signal in the various composites available on the market, the magnitude of the signal compared to the dosimetric signal, nor its evolution with time. In this study, we conducted a systematic characterization of the signal (intensity, kinetics, interference with dosimetric signal) on 19 most widely used composites for tooth restoration, and on 14 experimental resins made with the most characteristic monomers found in commercial composites. Although a strong EPR signal was observed in every material, a rapid decay of the signal was noted. Six months after the polymerization, the signal was negligible in most composites compared to a 3 Gy dosimetric signal in a tooth. In some cases, a stable atypical signal was observed, which was still interfering with the dosimetric signal.
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Affiliation(s)
- Philippe Levêque
- Biomedical Magnetic Resonance Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
- Center for Research and Engineering on Biomaterials CRIBIO, Université catholique de Louvain, Brussels, Belgium
| | - Céline Desmet
- Biomedical Magnetic Resonance Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
| | | | - Sébastien Beun
- School of Dentistry and Stomatology, Université catholique de Louvain, Brussels, Belgium
| | - Julian G. Leprince
- Center for Research and Engineering on Biomaterials CRIBIO, Université catholique de Louvain, Brussels, Belgium
- Institute of Condensed Matter and Nanosciences, Bio- and Soft- Matter, Université catholique de Louvain, Louvain-la-Neuve, Belgium
- School of Dentistry and Stomatology, Université catholique de Louvain, Brussels, Belgium
| | - Gaëtane Leloup
- Center for Research and Engineering on Biomaterials CRIBIO, Université catholique de Louvain, Brussels, Belgium
- Institute of Condensed Matter and Nanosciences, Bio- and Soft- Matter, Université catholique de Louvain, Louvain-la-Neuve, Belgium
- School of Dentistry and Stomatology, Université catholique de Louvain, Brussels, Belgium
| | - Bernard Gallez
- Biomedical Magnetic Resonance Research Group, Louvain Drug Research Institute, Université catholique de Louvain, Brussels, Belgium
- Center for Research and Engineering on Biomaterials CRIBIO, Université catholique de Louvain, Brussels, Belgium
- * E-mail:
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