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Radiation Research

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https://www.readbyqxmd.com/read/29140165/improved-total-body-irradiation-survival-by-delivery-of-two-radiation-mitigators-that-target-distinct-cell-death-pathways
#1
Justin Steinman, Michael Epperly, Wen Hou, John Willis, Hong Wang, Renee Fisher, Bing Liu, Ivet Bahar, Travis McCaw, Valerian Kagan, Hulya Bayir, Jian Yu, Peter Wipf, Song Li, M Saiful Huq, Joel S Greenberger
The acute lethality of total-body irradiation (TBI) involves damage to multiple organs, including bone marrow and intestine. Ionizing radiation mitigators that are effective when delivered 24 h or later after TBI include the anti-apoptotic drug, JP4-039 and the anti-necroptotic drug, necrostatin-1. In contrast to effective delivery of JP4-039 at 24 h after TBI, necrostatin-1 is most effective when delivery is delayed until 48 h, a time that correlates with the elevation of necroptosis-inducing inflammatory cytokines and necroptosis-induced serine phosphorylation of receptor-interacting serine/threonine-protein kinase-3 (RIP3) in tissues...
November 15, 2017: Radiation Research
https://www.readbyqxmd.com/read/29140164/second-order-kinetics-of-dtpa-and-plutonium-in-rat-plasma
#2
Guthrie Miller, Deepesh Poudel, John A Klumpp, Raymond A Guilmette, Dunstana Melo
In 2008, Serandour et al. reported on their in vitro experiment involving rat plasma samples obtained after an intravenous intake of plutonium citrate. Different amounts of DTPA were added to the plasma samples and the percentage of low-molecular-weight plutonium measured. Only when the DTPA dosage was three orders of magnitude greater than the recommended 30 μmol/kg was 100% of the plutonium apparently in the form of chelate. These data were modeled assuming three competing chemical reactions with other molecules that bind with plutonium...
November 15, 2017: Radiation Research
https://www.readbyqxmd.com/read/29136393/gilbert-w-beebe-symposium-on-30-years-after-the-chernobyl-accident-current-and-future-studies-on-radiation-health-effects
#3
Jonathan M Samet, Amy Berrington de González, Lawrence T Dauer, Maureen Hatch, Ourania Kosti, Fred A Mettler, Merriline M Satyamitra
This commentary summarizes the presentations and discussions from the 2016 Gilbert W. Beebe symposium "30 years after the Chernobyl accident: Current and future studies on radiation health effects." The symposium was hosted by the National Academies of Sciences, Engineering, and Medicine (the National Academies). The symposium focused on the health consequences of the Chernobyl accident, looking retrospectively at what has been learned and prospectively at potential future discoveries using emerging 21st Century research methodologies...
November 14, 2017: Radiation Research
https://www.readbyqxmd.com/read/29136392/rescue-effect-inherited-in-colony-formation-assays-affects-radiation-response
#4
Gabriel Adrian, Crister Ceberg, Ana Carneiro, Lars Ekblad
It is well known that nonirradiated cells can exhibit radiation damage (bystander effect), and recent findings have shown that nonirradiated cells may help protect irradiated cells (rescue effect). These findings call into question the traditional view of radiation response: cells cannot be envisioned as isolated units. Here, we investigated traditional colony formation assays to determine if they also comprise cellular communication affecting the radiation response, using colony formation assays with varying numbers of cells, modulated beam irradiation and media transfer...
November 14, 2017: Radiation Research
https://www.readbyqxmd.com/read/29136391/effects-of-1-h-16-o-charged-particle-irradiation-on-short-term-memory-and-hippocampal-physiology-in-a-murine-model
#5
Frederico Kiffer, Hannah Carr, Thomas Groves, Julie E Anderson, Tyler Alexander, Jing Wang, John W Seawright, Vijayalakshmi Sridharan, Gwendolyn Carter, Marjan Boerma, Antiño R Allen
Radiation from galactic cosmic rays (GCR) poses a significant health risk for deep-space flight crews. GCR are unique in their extremely high-energy particles. With current spacecraft shielding technology, some of the predominant particles astronauts would be exposed to are (1)H + (16)O. Radiation has been shown to cause cognitive deficits in mice. The hippocampus plays a key role in memory and cognitive tasks; it receives information from the cortex, undergoes dendritic-dependent processing and then relays information back to the cortex...
November 14, 2017: Radiation Research
https://www.readbyqxmd.com/read/29073360/modeling-radiation-effects-of-ultrasoft-x-rays-on-the-basis-of-amorphous-track-structure
#6
Tamara Buch, Emanuele Scifoni, Michael Krämer, Marco Durante, Michael Scholz, Thomas Friedrich
There is experimental evidence that ultrasoft X rays (0.1-5 keV) show a higher biological effectiveness than high-energy photons. Similar to high-LET radiation, this is attributed to a rather localized dose distribution associated with a considerably smaller range of secondary electrons, which results in an increasing yield of double-strand breaks (DSBs) and potentially more complex lesions. We previously reported on the application of the Giant LOop Binary LEsion (GLOBLE) model to ultrasoft X rays, in which experimental values of the relative biological effectiveness (RBE) for DSB induction were used to show that this increasing DSB yield was sufficient to explain the enhanced effectiveness in the cell inactivation potential of ultrasoft X rays...
October 26, 2017: Radiation Research
https://www.readbyqxmd.com/read/29059001/activation-of-the-trpv1-thermoreceptor-induced-by-modulated-or-unmodulated-1800-mhz-radiofrequency-field-exposure
#7
Hermanus J Ruigrok, Delia Arnaud-Cormos, Annabelle Hurtier, Emmanuelle Poque, Florence Poulletier de Gannes, Gilles Ruffié, Fabrice Bonnaudin, Isabelle Lagroye, Neso Sojic, Stéphane Arbault, Philippe Lévêque, Bernard Veyret, Yann Percherancier
The existence of effects of radiofrequency field exposure at environmental levels on living tissues and organisms remains controversial, in particular regarding potential "nonthermal" effects produced in the absence of temperature elevation. Therefore, we investigated whether TRPV1, one of the most studied thermosensitive channels, can be activated by the heat produced by radiofrequency fields and by some specific nonthermal interaction with the fields. We have recently shown that TRPV1 activation can be assessed in real-time on live cells using the bioluminescence resonance energy transfer technique...
October 23, 2017: Radiation Research
https://www.readbyqxmd.com/read/29053406/super-resolution-nanoscopy-imaging-applied-to-dna-double-strand-breaks
#8
Sofia D'Abrantes, Sarah Gratton, Pamela Reynolds, Verena Kriechbaumer, Joseph McKenna, Stephen Barnard, Dave Clarke, Stanley W Botchway
Genomic deoxyribonucleic acid (DNA) is continuously being damaged by endogenous processes such as metabolism or by exogenous events such as radiation. The specific phosphorylation of histone H2AX on serine residue 139, described as γ-H2AX, is an excellent indicator or marker of DNA double-strand breaks (DSBs). The yield of γ-H2AX (foci) is shown to have some correlation with the dose of radiation or other DSB-causing agents. However, there is some discrepancy in the DNA DSB foci yield among imaging and other methods such as gel electrophoresis...
October 20, 2017: Radiation Research
https://www.readbyqxmd.com/read/29045193/a-microdosimetric-kinetic-model-of-cell-killing-by-irradiation-from-permanently-incorporated-radionuclides
#9
Roland B Hawkins
An expression for the surviving fraction of a replicating population of cells exposed to permanently incorporated radionuclide is derived from the microdosimetric-kinetic model. It includes dependency on total implant dose, linear energy transfer (LET), decay rate of the radionuclide, the repair rate of potentially lethal lesions in DNA and the volume doubling time of the target population. This is used to obtain an expression for the biologically effective dose (BEDα/β) based on the minimum survival achieved by the implant that is equivalent to, and can be compared and combined with, the BEDα/β calculated for a fractionated course of radiation treatment...
October 18, 2017: Radiation Research
https://www.readbyqxmd.com/read/29035153/acute-and-chronic-kidney-injury-in-a-non-human-primate-model-of-partial-body-irradiation-with-bone-marrow-sparing
#10
Eric P Cohen, Kim G Hankey, Alexander W Bennett, Ann M Farese, George A Parker, Thomas J MacVittie
The development of medical countermeasures against acute and delayed multi-organ injury requires animal models predictive of the human response to radiation and its treatment. Late chronic injury is a well-known feature of radiation nephropathy, but acute kidney injury has not been reported in an appropriate animal model. We have established a single-fraction partial-body irradiation model with minimal marrow sparing in non-human primates. Subject-based medical management was used including parenteral fluids according to prospective morbidity criteria...
October 16, 2017: Radiation Research
https://www.readbyqxmd.com/read/29019742/the-impact-of-hypoxia-on-out-of-field-cell-survival-after-exposure-to-modulated-radiation-fields
#11
Hannah F Thompson, Karl T Butterworth, Stephen J McMahon, Mihaela Ghita, Alan R Hounsell, Kevin M Prise
Advanced radiotherapy techniques such as intensity modulated radiation therapy achieve highly conformal dose distributions within target tumor volumes through the sequential delivery of multiple spatially and temporally modulated radiation fields and have been shown to influence radiobiological response. The goals of this study were to determine the effect of hypoxia on the cell survival responses of different cell models (H460, DU145, A549, MDA231 and FADU) to modulated fields and to characterize the time dependency of signaling under oxic conditions, following reoxygenation and after prolonged hypoxia...
October 11, 2017: Radiation Research
https://www.readbyqxmd.com/read/29019741/activation-of-mtorc1-signaling-is-required-for-timely-hair-follicle-regeneration-from-radiation-injury
#12
Wei-Hung Wang, Ting-Han Chien, Sabrina Mai-Yi Fan, Wen-Yen Huang, Shih-Fan Lai, June-Tai Wu, Sung-Jan Lin
Transit amplifying cells (TACs) are highly proliferative in nature and tend to be sensitive to ionizing radiation. Due to the abundance of TACs that support the elongation of hair shafts, growing hair follicles are highly sensitive to radiation injury. How hair follicles repair themselves after radiation injury is unclear. In this study, we observed that in 4 Gy irradiated mice, hair follicle dystrophy was induced with apoptosis-driven loss of hair matrix cells, which are the TACs that fuel hair growth. The dystrophy was repaired within 96 h without significant hair loss, indicating that a regenerative attempt successfully restored the TAC population to resume anagen growth...
October 11, 2017: Radiation Research
https://www.readbyqxmd.com/read/28985139/lung-cancer-risk-from-plutonium-a-pooled-analysis-of-the-mayak-and-sellafield-worker-cohorts
#13
Michael Gillies, Irina Kuznetsova, Mikhail Sokolnikov, Richard Haylock, Jackie O'Hagan, Yulia Tsareva, Elena Labutina
In this study, lung cancer risk from occupational plutonium exposure was analyzed in a pooled cohort of Mayak and Sellafield workers, two of the most informative cohorts in the world with detailed plutonium urine monitoring programs. The pooled cohort comprised 45,817 workers: 23,443 Sellafield workers first employed during 1947-2002 with follow-up until the end of 2005 and 22,374 Mayak workers first employed during 1948-1982 with follow-up until the end of 2008. In the pooled cohort 1,195 lung cancer deaths were observed (789 Mayak, 406 Sellafield) but only 893 lung cancer incidences (509 Mayak, 384 Sellafield, due to truncated follow-up in the incidence analysis)...
October 6, 2017: Radiation Research
https://www.readbyqxmd.com/read/28985133/organ-doses-associated-with-partial-body-irradiation-with-2-5-bone-marrow-sparing-of-the-non-human-primate-a-retrospective-study
#14
C Prado, T J MacVittie, A W Bennett, A Kazi, A M Farese, K Prado
A partial-body irradiation model with approximately 2.5% bone marrow sparing (PBI/BM2.5) was established to determine the radiation dose-response relationships for the prolonged and delayed multi-organ effects of acute radiation exposure. Historically, doses reported to the entire body were assumed to be equal to the prescribed dose at some defined calculation point, and the dose-response relationship for multi-organ injury has been defined relative to the prescribed dose being delivered at this point, e.g...
October 6, 2017: Radiation Research
https://www.readbyqxmd.com/read/28977780/urinary-mirnas-as-biomarkers-for-noninvasive-evaluation-of-radiation-induced-renal-tubular-injury
#15
Sagar Bhayana, Feifei Song, Jidhin Jacob, Paolo Fadda, Nicholas C Denko, Meng Xu-Welliver, Arnab Chakravarti, Naduparambil K Jacob
Radiation nephropathy is one of the common late effects in cancer survivors who received radiotherapy as well as in victims of radiation accidents. The clinical manifestations of radiation nephropathy occur months after exposure. To date, there are no known early biomarkers to predict the future development of radiation nephropathy. This study focuses on the development of urinary biomarkers providing readout of acute responses in renal tubular epithelial cells. An amplification-free hybridization-based nCounter assay was used to detect changes in mouse urinary miRNAs after irradiation...
October 4, 2017: Radiation Research
https://www.readbyqxmd.com/read/28961076/long-term-deficits-in-behavior-performances-caused-by-low-and-high-linear-energy-transfer-radiation
#16
Rutulkumar Patel, Hiroyuki Arakawa, Tomas Radivoyevic, Stanton L Gerson, Scott M Welford
Efforts to protect astronauts from harmful galactic cosmic radiation (GCR) require a better understanding of the effects of GCR on human health. In particular, little is known about the lasting effects of GCR on the central nervous system (CNS), which may lead to behavior performance deficits. Previous studies have shown that high-linear energy transfer (LET) radiation in rodents leads to short-term declines in a variety of behavior tests. However, the lasting impact of low-, medium- and high-LET radiation on behavior are not fully defined...
September 29, 2017: Radiation Research
https://www.readbyqxmd.com/read/28956695/tumor-cell-invasion-induced-by-radiation-in-balb-c-mouse-is-prevented-by-the-cox-2-inhibitor-ns-398
#17
Rosalie Lemay, Martin Lepage, Luc Tremblay, Hélène Therriault, Gabriel Charest, Benoit Paquette
Radiation stimulates the expression of inflammatory mediators known to increase cancer cell invasion. Therefore, it is important to determine whether anti-inflammatory drugs can prevent this adverse effect of radiation. Since cyclooxygenase-2 (COX-2) is a central player in the inflammatory response, we performed studies to determine whether the COX-2 inhibitor NS-398 can reduce the radiation enhancement of cancer cell invasion. Thighs of Balb/c mice treated with NS-398 were irradiated with either daily fractions of 7...
September 28, 2017: Radiation Research
https://www.readbyqxmd.com/read/28952912/measurement-of-dna-dependent-protein-kinase-phosphorylation-using-flow-cytometry-provides-a-reliable-estimate-of-dna-repair-capacity
#18
Andris Abramenkovs, Bo Stenerlöw
Uncontrolled generation of DNA double-strand breaks (DSBs) in cells is regarded as a highly toxic event that threatens cell survival. Radiation-induced DNA DSBs are commonly measured by pulsed-field gel electrophoresis, microscopic evaluation of accumulating DNA damage response proteins (e.g., 53BP1 or γ-H2AX) or flow cytometric analysis of γ-H2AX. The advantage of flow cytometric analysis is that DSB formation and repair can be studied in relationship to cell cycle phase or expression of other proteins. However, γ-H2AX is not able to monitor repair kinetics within the first 60 min postirradiation, a period when most DSBs undergo repair...
September 27, 2017: Radiation Research
https://www.readbyqxmd.com/read/28952911/high-let-radiation-increases-tumor-progression-in-a-k-ras-driven-model-of-lung-adenocarcinoma
#19
Marie-Liesse Asselin-Labat, Rishi Rampersad, Xia Xu, Matthew E Ritchie, Jacob Michalski, Lingling Huang, Mark W Onaitis
High-linear energy transfer (LET) radiation encountered by astronauts in space generates clustered DNA damage that is potentially oncogenic. Analysis of the impact of exposure to space radiation on cancer formation is necessary to determine the best ways to prepare astronauts for space travel so they are protected for the duration of the space mission. A mouse model of lung adenocarcinoma driven by oncogenic K-Ras was used to ascertain the effect of low- and high-LET radiation on tumor formation. We observed increased tumor progression and tumor cell proliferation after single dose or fractionated high-LET doses, which was not observed in mice exposed to low-LET radiation...
November 2017: Radiation Research
https://www.readbyqxmd.com/read/28952879/exploring-the-link-between-radiation-exposure-and-multifocal-basal-cell-carcinomas-in-a-former-chernobyl-clean-up-worker-by-combining-different-molecular-biological-techniques
#20
Benjamin V Becker, Claus Richter, Reinhard Ullmann, Christina Beinke, Matthäus Majewski, Viktoria Exner, Guido Weisel, Michael Abend, Matthias Port
Thirty years after the Chernobyl nuclear power plant accident we report on a patient who was a clean-up worker, who subsequently developed multiple cutaneous basal cell carcinomas (BCCs). We used several methods to assess the biological long-term effects related to low-dose external and internal radiation exposure. Specifically, because BCC risk may be increased with ionizing radiation exposure, we endeavored to determine whether the multifocal BCCs were related to the patient's past clean-up work. We assessed cytogenetic changes using peripheral blood, and internal incorporation was measured with a whole-body counter...
November 2017: Radiation Research
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