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Vinnikov VA. Effect of changing the radiation dose range on the in vitro cytogenetic dose response to gamma-rays. Int J Radiat Biol 2024; 100:875-889. [PMID: 38647504 DOI: 10.1080/09553002.2024.2338511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Accepted: 03/27/2024] [Indexed: 04/25/2024]
Abstract
PURPOSE To examine the distortion of the linear quadratic (LQ) model of in vitro cytogenetic dose response over an extended range of γ-ray doses by analyzing the available literature data, and to establish the dose ranges, in which the LQ dose response curve (DRC) can be most accurately fitted for biological dosimetry. MATERIALS AND METHODS Data on yields of dicentrics (Dic) or dicentrics plus centric rings (Dic + CR) induced in vitro in human lymphocytes by acute γ-rays were extracted from 108 open sources. The overall dose response dataset in the dose range up to 50 Gy was fitted to a fractional-rational (FR) model, which included a 'basic' LQ function in the numerator, and a reduction factor dependent on the square of the dose in the denominator. Cytogenetic dose response data obtained at Grigoriev Institute for Medical Radiology, Kharkiv, Ukraine (GIMRO) in the range 0.1 - 20.3 Gy acute γ-rays were fitted to the LQ model with the progressive changing minimum or maximum radiation dose. RESULTS The overall dose response, as expected, followed the LQ function in the dose range ≤5 Gy, but in the extended dose range appeared to be S-shaped, with intensive saturation and a plateau at doses ≥22 Gy. Coefficients of the 'basic' LQ equation in FR model were very close to many published DRCs; calculated asymptote was 17. Fitting of the GIMRO dataset to the LQ model with the shift of the dose range showed the increase in linear coefficient with the increment of either minimum or maximum radiation dose, while the decline of the quadratic coefficient was regulated mostly by the increase of the highest dose. The best goodness of fit, assessed by lower χ2 values, occurred for dose ranges 0.1 - 1.0 Gy; 0.5 - 5.9 Gy; 1.0 - 7.8 Gy; 2.0 - 9.6 Gy, 3.9 - 16.4 Gy and 5.9 - 20.3 Gy. The 'see-saw' effect in changes of LQ coefficients was confirmed by re-fitting datasets published by other laboratories. CONCLUSIONS The classical LQ model with fixed coefficients appears to have limited applicability for cytogenetic dosimetry at radiation doses >5 Gy due to the saturation of the dose response. Different response of the LQ coefficients to the changes of the dose range must be considered during the DRC construction. Proper selection of minimum and maximum dose in calibration experiments makes it possible to improve the goodness of fit of the LQ DRC.
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Affiliation(s)
- Volodymyr A Vinnikov
- S.P. Grigoriev Institute for Medical Radiology and Oncology, National Academy of Medical Science of Ukraine, Kharkiv, Ukraine
- Department of Radiobiology, Cancer Research Institute, Biomedical Research Centre of Slovak Academy of Science, Bratislava, Slovak Republic
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Background Level of Unstable Chromosome Aberrations in the Kazakhstan Population: A Human Biomonitoring Study. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19148485. [PMID: 35886338 PMCID: PMC9320529 DOI: 10.3390/ijerph19148485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 07/03/2022] [Accepted: 07/07/2022] [Indexed: 02/04/2023]
Abstract
Kazakhstan is known as a country with a complex radioecological situation resulting from different sources such as a natural radiation background, extensive activities of the industrial system of the former Soviet Union and a well-known testing of nuclear power weapons occurred in the Semipalatinsk Test Site (STS) area. The present study focuses on the assessment of the background of dicentric chromosomes in Kazakhstan’s population, which is the starting point in the dose assessment of irradiated people, since the baseline level of spontaneous dicentrics can vary significantly in different populations. In this context, aiming to determine the background frequency of chromosome aberrations in the population of Kazakhstan, considering the heterogeneity of natural radiation background levels of its large territory, a selection of 40 control subjects living in four cities of North, South, West and East Kazakhstan was performed. The cytogenetic study on the selected groups showed fairly low background frequency values of chromosome aberrations (0.84 ± 0.83 per 1000 cells), comparable with other data in the literature on general populations, reporting background frequency values between 0.54 and 2.99 per 1000 cells. The obtained results should be taken into account when constructing the dose–effect calibration curve used in cytogenetic biodosimetry, as a “zero” dose point, which will reduce the uncertainty in quantifying the individual absorbed dose in emergency radiological situations.
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Gregoire E, Barquinero JF, Gruel G, Benadjaoud M, Martinez JS, Beinke C, Balajee A, Beukes P, Blakely WF, Dominguez I, Duy PN, Gil OM, Güçlü I, Guogyte K, Hadjidekova SP, Hadjidekova V, Hande P, Jang S, Lumniczky K, Meschini R, Milic M, Montoro A, Moquet J, Moreno M, Norton FN, Oestreicher U, Pajic J, Sabatier L, Sommer S, Testa A, Terzoudi G, Valente M, Venkatachalam P, Vral A, Wilkins RC, Wojcik A, Zafiropoulos D, Kulka U. RENEB Inter-Laboratory comparison 2017: limits and pitfalls of ILCs. Int J Radiat Biol 2021; 97:888-905. [PMID: 33970757 DOI: 10.1080/09553002.2021.1928782] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 04/01/2021] [Accepted: 05/06/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE In case of a mass-casualty radiological event, there would be a need for networking to overcome surge limitations and to quickly obtain homogeneous results (reported aberration frequencies or estimated doses) among biodosimetry laboratories. These results must be consistent within such network. Inter-laboratory comparisons (ILCs) are widely accepted to achieve this homogeneity. At the European level, a great effort has been made to harmonize biological dosimetry laboratories, notably during the MULTIBIODOSE and RENEB projects. In order to continue the harmonization efforts, the RENEB consortium launched this intercomparison which is larger than the RENEB network, as it involves 38 laboratories from 21 countries. In this ILC all steps of the process were monitored, from blood shipment to dose estimation. This exercise also aimed to evaluate the statistical tools used to compare laboratory performance. MATERIALS AND METHODS Blood samples were irradiated at three different doses, 1.8, 0.4 and 0 Gy (samples A, C and B) with 4-MV X-rays at 0.5 Gy min-1, and sent to the participant laboratories. Each laboratory was requested to blindly analyze 500 cells per sample and to report the observed frequency of dicentric chromosomes per metaphase and the corresponding estimated dose. RESULTS This ILC demonstrates that blood samples can be successfully distributed among laboratories worldwide to perform biological dosimetry in case of a mass casualty event. Having achieved a substantial harmonization in multiple areas among the RENEB laboratories issues were identified with the available statistical tools, which are not capable to advantageously exploit the richness of results of a large ILCs. Even though Z- and U-tests are accepted methods for biodosimetry ILCs, setting the number of analyzed metaphases to 500 and establishing a tests' common threshold for all studied doses is inappropriate for evaluating laboratory performance. Another problem highlighted by this ILC is the issue of the dose-effect curve diversity. It clearly appears that, despite the initial advantage of including the scoring specificities of each laboratory, the lack of defined criteria for assessing the robustness of each laboratory's curve is a disadvantage for the 'one curve per laboratory' model. CONCLUSIONS Based on our study, it seems relevant to develop tools better adapted to the collection and processing of results produced by the participant laboratories. We are confident that, after an initial harmonization phase reached by the RENEB laboratories, a new step toward a better optimization of the laboratory networks in biological dosimetry and associated ILC is on the way.
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Affiliation(s)
- Eric Gregoire
- Institut de Radioprotection et de Sûreté Nucléaire, Fontenay-aux-Roses, France
| | | | - Gaetan Gruel
- Institut de Radioprotection et de Sûreté Nucléaire, Fontenay-aux-Roses, France
| | | | - Juan S Martinez
- Institut de Radioprotection et de Sûreté Nucléaire, Fontenay-aux-Roses, France
| | - Christina Beinke
- Bundeswehr Institute of Radiobiology affiliated to the University of Ulm, Munich, Germany
| | - Adayabalam Balajee
- Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN, USA
| | | | - William F Blakely
- Armed Forces Radiobiology Research Institute, Uniformed Service University of the Health, Sciences, Bethesda, MD, USA
| | | | - Pham Ngoc Duy
- Center of Biotechnology, Nuclear Research Institute, Dalat city, Vietnam
| | - Octávia Monteiro Gil
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, Bobadela-LRS, Portugal
| | - Inci Güçlü
- Turkish Atomic Energy Authority, Cekmece Nuclear Research and Training Center, Radiobiology Unit Yarımburgaz, Istanbul, Turkey
| | | | | | | | - Prakash Hande
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | | | - Katalin Lumniczky
- National Research Institute for Radiobiology & Radiohygiene, Budapest, Hungary
| | | | | | - Alegria Montoro
- Fundación para la Investigación del Hospital Universitario LA FE de la Comunidad Valenciana, Valencia, Spain
| | - Jayne Moquet
- Public Health England, Centre for Radiation Chemical and Environmental Hazards, Chilton, UK
| | - Mercedes Moreno
- Servicio Madrileño de Salud - Hospital General Universitario Gregorio Marañón, Madrid, Spain
| | - Farrah N Norton
- Radiobiology & Health, Canadian Nuclear Laboratories, Chalk River, Canada
| | - Ursula Oestreicher
- Federal Office for Radiation Protection (BfS), Oberschleissheim, Germany
| | - Jelena Pajic
- Serbian Institute of Occupational Health, Radiation Protection Center, Belgrade, Serbia
| | - Laure Sabatier
- PROCyTOX, Commissariat à l'Energie Atomique et aux Energies Alternatives, Fontenay aux-Roses, France and Université Paris-Saclay, France
| | - Sylwester Sommer
- Institute of Nuclear Chemistry and Technology (INCT), Warsaw, Poland
| | - Antonella Testa
- Agenzia Nazionale per le Nuove Tecnologie, L´Energia e lo Sviluppo Economico Sostenibile, Rome, Italy
| | - Georgia Terzoudi
- National Center for Scientific Research "Demokritos", NCSR"D", Athens, Greece
| | | | | | - Anne Vral
- Radiobiology Research Unit, Gent University, Gent, Belgium
| | | | - Andrzej Wojcik
- Institute Molecular Biosciences, Stockholm University, Stockholm, Sweden
| | | | - Ulrike Kulka
- Federal Office for Radiation Protection (BfS), Oberschleissheim, Germany
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Beinke C, Port M, Ullmann R, Gilbertz K, Majewski M, Abend M. Analysis of Gene Expression Changes in PHA-M Stimulated Lymphocytes - Unraveling PHA Activity as Prerequisite for Dicentric Chromosome Analysis. Radiat Res 2018; 189:579-596. [PMID: 29613823 DOI: 10.1667/rr14974.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Dicentric chromosome analysis (DCA) is the gold standard for individual radiation dose assessment. However, DCA is limited by the time-consuming phytohemagglutinin (PHA)-mediated lymphocyte activation. In this study using human peripheral blood lymphocytes, we investigated PHA-associated whole genome gene expression changes to elucidate this process and sought to identify suitable gene targets as a means of meeting our long-term objective of accelerating cell cycle kinetics to reduce DCA culture time. Human peripheral whole blood from three healthy donors was separately cultured in RPMI/FCS/antibiotics with BrdU and PHA-M. Diluted whole blood samples were transferred into PAXgene tubes at 0, 12, 24 and 36 h culture time. RNA was isolated and aliquots were used for whole genome gene expression screening. Microarray results were validated using qRT-PCR and differentially expressed genes [significantly (FDR corrected) twofold different from the 0 h value reference] were analyzed using several bioinformatic tools. The cell cycle positions and DNA-synthetic activities of lymphocytes were determined by analyzing the correlated total DNA content and incorporated BrdU level with flow cytometry after continued BrdU incubation. From 42,545 transcripts of the whole genome microarray 47.6%, on average, appeared expressed. The number of differentially expressed genes increased linearly from 855 to 2,858 and 4,607 at 12, 24 and 36 h after PHA addition, respectively. Approximately 2-3 times more up- than downregulated genes were observed with several hundred genes differentially expressed at each time point. Earliest enrichment was observed for gene sets related to the nucleus (12 h) followed by genes assigned to intracellular structures such as organelles (24 h) and finally genes related to the membrane and the extracellular matrix were enriched (36 h). Early gene expression changes at 12 h, in particular, were associated with protein classes such as chemokines/cytokines (e.g., CXCL1, CXCL2) and chaperones. Genes coding for biological processes involved in cell cycle control (e.g., MYBL2, RBL1, CCNA, CCNE) and DNA replication (e.g., POLA, POLE, MCM) appeared enriched at 24 h and later, but many more biological processes (42 altogether) showed enrichment as well. Flow cytometry data fit together with gene expression and bioinformatic analyses as cell cycle transition into S phase was observed with interindividual differences from 12 h onward, whereas progression into G2 as well as into the second G1 occurred from 36 h onward after activation. Gene set enrichment analysis over time identifies, in particular, two molecular categories of PHA-responsive gene targets (cytokine and cell cycle control genes). Based on that analysis target genes for cell cycle acceleration in lymphocytes have been identified ( CDKN1A/B/C, RBL-1/RBL-2, E2F2, Deaf-1), and it remains undetermined whether the time expenditure for DCA can be reduced by influencing gene expression involved in the regulatory circuits controlling PHA-associated cell cycle entry and/or progression at a specific early cell cycle phase.
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Affiliation(s)
- C Beinke
- Bundeswehr Institute of Radiobiology affiliated to the University Ulm, Munich, Germany
| | - M Port
- Bundeswehr Institute of Radiobiology affiliated to the University Ulm, Munich, Germany
| | - R Ullmann
- Bundeswehr Institute of Radiobiology affiliated to the University Ulm, Munich, Germany
| | - K Gilbertz
- Bundeswehr Institute of Radiobiology affiliated to the University Ulm, Munich, Germany
| | - M Majewski
- Bundeswehr Institute of Radiobiology affiliated to the University Ulm, Munich, Germany
| | - M Abend
- Bundeswehr Institute of Radiobiology affiliated to the University Ulm, Munich, Germany
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5
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Manivannan B, Kuppusamy T, Venkatesan S, Perumal V. A comparison of estimates of doses to radiotherapy patients obtained with the dicentric chromosome analysis and the γ-H2AX assay: Relevance to radiation triage. Appl Radiat Isot 2017; 131:1-7. [PMID: 29080427 DOI: 10.1016/j.apradiso.2017.10.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 10/14/2017] [Accepted: 10/14/2017] [Indexed: 11/18/2022]
Abstract
The γ-H2AX assay was investigated as an alternative to the time-consuming dicentric chromosome assay (DCA). Radiation doses to 25 radiotherapy patients were estimated in parallel by DCA and the γ-H2AX assay. The γ-H2AX assay yielded doses in line with the calculated equivalent whole body doses in 92% of the patients, whereas the success rate of DCA was only 76%. The result shows that the γ-H2AX assay can be effectively used as a rapid and more precise alternative to DCA.
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Affiliation(s)
- Bhavani Manivannan
- Department of Human Genetics, College of Biomedical Sciences, Technology and Research, Sri Ramachandra University, Porur, Chennai 600116, Tamil Nadu, India.
| | - Thayalan Kuppusamy
- Dr. Kamakshi Memorial Hospital Pvt. Ltd., Pallikaranai, Chennai 600100, Tamil Nadu, India.
| | - Srinivasan Venkatesan
- Dr. Kamakshi Memorial Hospital Pvt. Ltd., Pallikaranai, Chennai 600100, Tamil Nadu, India.
| | - Venkatachalam Perumal
- Department of Human Genetics, College of Biomedical Sciences, Technology and Research, Sri Ramachandra University, Porur, Chennai 600116, Tamil Nadu, India.
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Beinke C, Port M, Lamkowski A, Abend M. Comparing seven mitogens with PHA-M for improved lymphocyte stimulation in dicentric chromosome analysis for biodosimetry. RADIATION PROTECTION DOSIMETRY 2016; 168:235-41. [PMID: 25958413 PMCID: PMC4884885 DOI: 10.1093/rpd/ncv286] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Accepted: 03/13/2015] [Indexed: 05/06/2023]
Abstract
Dicentric chromosome analysis (DCA) is the gold standard for individual radiation dose estimation. Two limiting factors of DCA are the time-consuming lymphocyte stimulation and proliferation using the lectin PHA-M and the upper dose limit of individual dose assessment of ∼4 Gy. By measuring the mitotic index (MI), the authors investigated systematically whether the stimulation of lymphocytes can be improved after administration of alternative (and combined) mitogens. The authors compared the lymphocyte stimulation effectiveness of the traditionally used PHA-M (from Phaseolus vulgaris) with seven cited mitogens by determination of MIs: five lectins namely CNA (concanavalin A), PW (pokeweed), LMA (Maackia amurensis), LTV (T. vulgaris), PHA-L (P. vulgaris) as well as LPS (lipopolysaccharide, Escherichia coli) and SLO (streptolysine O, Streptococcus pyogenes) were applied. The conventional protocol using PHA-M for lymphocyte stimulation proved to be superior over lower/higher PHA-M concentrations as well as seven other mitogens administered either alone or combined with SLO or LPS.
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Affiliation(s)
- C Beinke
- Bundeswehr Institute of Radiobiology Affiliated to the University Ulm, Neuherbergstr. 11, Munich 80937, Germany
| | - M Port
- Bundeswehr Institute of Radiobiology Affiliated to the University Ulm, Neuherbergstr. 11, Munich 80937, Germany
| | - A Lamkowski
- Bundeswehr Institute of Radiobiology Affiliated to the University Ulm, Neuherbergstr. 11, Munich 80937, Germany
| | - M Abend
- Bundeswehr Institute of Radiobiology Affiliated to the University Ulm, Neuherbergstr. 11, Munich 80937, Germany
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Bakkiam D, Bhavani M, Anantha Kumar AA, Sonwani S, Venkatachalam P, Sivasubramanian K, Venkatraman B. Dicentric assay: inter-laboratory comparison in Indian laboratories for routine and triage applications. Appl Radiat Isot 2015; 99:77-85. [PMID: 25728004 DOI: 10.1016/j.apradiso.2015.02.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 02/17/2015] [Accepted: 02/18/2015] [Indexed: 11/16/2022]
Abstract
An Inter-Laboratory Comparison (ILC) study on Dicentric Chromosome Assay (DCA) was carried out between two Indian biodosimetry labs. Human peripheral blood samples exposed to 10 different doses of X-rays up to 5Gy were shared between the labs to generate calibration data. Validation of calibration curves was done by dose estimation of coded samples exposed to X- or gamma radiation. Reliability of the DCA data for triage application was evaluated by scoring 20, 50 and 100 metaphases in the dose range of 0.5-3.0Gy. No significant difference was observed between labs regarding the established calibration data as well as the DCA triage dose assessments. Scoring of 20 metaphases (MP) was adequate to detect radiation exposure of >2Gy whereas 50 MP were sufficient to determine exposures of 0.5Gy. Both labs performed the DCA in a reliable manner and made the first step in setting up a biodosimetry network in India.
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Affiliation(s)
- D Bakkiam
- Radiological Safety Division, Indira Gandhi Center for Atomic Research, Kalpakkam, Tamilnadu, India
| | - M Bhavani
- Sri Ramachandra University, Porur, Chennai 600116, Tamilnadu, India
| | - A Arul Anantha Kumar
- Radiological Safety Division, Indira Gandhi Center for Atomic Research, Kalpakkam, Tamilnadu, India.
| | - Swetha Sonwani
- Radiological Safety Division, Indira Gandhi Center for Atomic Research, Kalpakkam, Tamilnadu, India
| | - P Venkatachalam
- Sri Ramachandra University, Porur, Chennai 600116, Tamilnadu, India
| | - K Sivasubramanian
- Radiological Safety Division, Indira Gandhi Center for Atomic Research, Kalpakkam, Tamilnadu, India
| | - B Venkatraman
- Radiological Safety Division, Indira Gandhi Center for Atomic Research, Kalpakkam, Tamilnadu, India
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8
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Bhavani M, Tamizh Selvan G, Kaur H, Adhikari JS, Vijayalakshmi J, Venkatachalam P, Chaudhury NK. Dicentric chromosome aberration analysis using giemsa and centromere specific fluorescence in-situ hybridization for biological dosimetry: An inter- and intra-laboratory comparison in Indian laboratories. Appl Radiat Isot 2014; 92:85-90. [PMID: 25014548 DOI: 10.1016/j.apradiso.2014.06.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Revised: 05/19/2014] [Accepted: 06/04/2014] [Indexed: 11/25/2022]
Abstract
To facilitate efficient handling of large samples, an attempt towards networking of laboratories in India for biological dosimetry was carried out. Human peripheral blood samples were exposed to (60)Co γ-radiation for ten different doses (0-5Gy) at a dose rate of 0.7 and 2Gy/min. The chromosomal aberrations (CA) were scored in Giemsa-stained and fluorescence in-situ hybridization with centromere-specific probes. No significant difference (p>0.05) was observed in the CA yield for given doses except 4 and 5Gy, between the laboratories, among the scorers and also staining methods adapted suggest the reliability and validates the inter-lab comparisons exercise for triage applications.
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Affiliation(s)
- M Bhavani
- Department of Human Genetics, College of Biomedical Sciences Technology and Research, Sri Ramachandra University, Porur, Chennai 600116, Tamil Nadu, India.
| | - G Tamizh Selvan
- Department of Human Genetics, College of Biomedical Sciences Technology and Research, Sri Ramachandra University, Porur, Chennai 600116, Tamil Nadu, India; Chemical Radioprotector and Radiation Dosimetry Research Group, Institute of Nuclear Medicine and Allied Sciences, Brig Mazumdar Road, DRDO, Timarpur, New Delhi 110054, India.
| | - Harpreet Kaur
- Department of Human Genetics, College of Biomedical Sciences Technology and Research, Sri Ramachandra University, Porur, Chennai 600116, Tamil Nadu, India.
| | - J S Adhikari
- Chemical Radioprotector and Radiation Dosimetry Research Group, Institute of Nuclear Medicine and Allied Sciences, Brig Mazumdar Road, DRDO, Timarpur, New Delhi 110054, India.
| | - J Vijayalakshmi
- Department of Human Genetics, College of Biomedical Sciences Technology and Research, Sri Ramachandra University, Porur, Chennai 600116, Tamil Nadu, India.
| | - P Venkatachalam
- Department of Human Genetics, College of Biomedical Sciences Technology and Research, Sri Ramachandra University, Porur, Chennai 600116, Tamil Nadu, India.
| | - N K Chaudhury
- Chemical Radioprotector and Radiation Dosimetry Research Group, Institute of Nuclear Medicine and Allied Sciences, Brig Mazumdar Road, DRDO, Timarpur, New Delhi 110054, India.
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Selvan GT, Bhavani M, Vijayalakshmi J, Paul Solomon FD, Chaudhury NK, Venkatachalam P. Delayed mitogenic stimulation decreases DNA damage assessed by micronucleus assay in human peripheral blood lymphocytes after (60)co irradiation. Dose Response 2014; 12:498-508. [PMID: 25249838 DOI: 10.2203/dose-response.13-060.selvan] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
While contradictory reports are available on the yield of dicentric chromosomes (DC) in blood samples stored at different temperature and stimulated to enter into cell cycle, various times gap followed by exposure, limited information is available on the micronucleus (MN) assay. As scoring the micronuclei frequency from the blood lymphocytes of exposed individuals is an alternative to the gold standard DC assay for triage applications, we examined radiation induced MN yield in delayed mitogenic stimulation after irradiation of in vitro. Peripheral blood lymphocytes (PBL) were exposed to low LET ((60)Co) radiation dose (0.1 to 5Gy) and incubated at 37°C for 2, 6 and 24 hours. The MN frequency obtained in blood samples stimulated 2 hours post-irradiation showed a dose dependent increase and used to construct the dose-response curve. Further, the results also showed that blood samples stimulated twenty four hours of post-irradiation, a significant reduction (p<0.05) in MN frequencies were obtained when compared to that of blood samples stimulated two hours and six hours after post-irradiation (0.5, 1, 3 and 5Gy). The observed result suggests that the prolonged PBL storage without mitogenic stimulation could lead to interphase cell death and a delayed blood sampling could results in underestimation of dose in biological dosimetry.
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Affiliation(s)
- G Tamizh Selvan
- Sri Ramachandra University, Porur, Chennai 600 116, Tamil Nadu, India; ; Institute of Nuclear Medicine and Allied Sciences, DRDO, Timarpur, New Delhi 110 054, India
| | - M Bhavani
- Sri Ramachandra University, Porur, Chennai 600 116, Tamil Nadu, India
| | - J Vijayalakshmi
- Sri Ramachandra University, Porur, Chennai 600 116, Tamil Nadu, India
| | - F D Paul Solomon
- Sri Ramachandra University, Porur, Chennai 600 116, Tamil Nadu, India
| | - N K Chaudhury
- Institute of Nuclear Medicine and Allied Sciences, DRDO, Timarpur, New Delhi 110 054, India
| | - P Venkatachalam
- Sri Ramachandra University, Porur, Chennai 600 116, Tamil Nadu, India
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10
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Beinke C, Barnard S, Boulay-Greene H, De Amicis A, De Sanctis S, Herodin F, Jones A, Kulka U, Lista F, Lloyd D, Martigne P, Moquet J, Oestreicher U, Romm H, Rothkamm K, Valente M, Meineke V, Braselmann H, Abend M. Laboratory Intercomparison of the Dicentric Chromosome Analysis Assay. Radiat Res 2013; 180:129-37. [DOI: 10.1667/rr3235.1] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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