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Radiation Research

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https://www.readbyqxmd.com/read/28328310/developing-human-radiation-biodosimetry-models-testing-cross-species-conversion-approaches-using-an-ex-vivo-model-system
#1
Jin G Park, Sunirmal Paul, Natalia Briones, Jia Zeng, Kristin Gillis, Garrick Wallstrom, Joshua LaBaer, Sally A Amundson
In the event of a large-scale radiation exposure, accurate and quick assessment of radiation dose received would be critical for triage and medical treatment of large numbers of potentially exposed individuals. Current methods of biodosimetry, such as the dicentric chromosome assay, are time consuming and require sophisticated equipment and highly trained personnel. Therefore, scalable biodosimetry approaches, including gene expression profiles in peripheral blood cells, are being investigated. Due to the limited availability of appropriate human samples, biodosimetry development has relied heavily on mouse models, which are not directly applicable to human response...
March 22, 2017: Radiation Research
https://www.readbyqxmd.com/read/28328309/ibpro-a-novel-short-duration-teaching-course-in-advanced-physics-and-biology-underlying-cancer-radiotherapy
#2
Michael C Joiner, Monica W Tracey, Sara E Kacin, Jay W Burmeister
This article provides a summary and status report of the ongoing advanced education program IBPRO - Integrated course in Biology and Physics of Radiation Oncology. IBPRO is a five-year program funded by NCI. It addresses the recognized deficiency in the number of mentors available who have the required knowledge and skill to provide the teaching and training that is required for future radiation oncologists and researchers in radiation sciences. Each year, IBPRO brings together 50 attendees typically at assistant professor level and upwards, who are already qualified/certified radiation oncologists, medical physicists or biologists...
March 22, 2017: Radiation Research
https://www.readbyqxmd.com/read/28323577/mitigation-of-radiation-induced-epithelial-damage-by-the-tlr5-agonist-entolimod-in-a-mouse-model-of-fractionated-head-and-neck-irradiation
#3
Ilia A Toshkov, Anatoli S Gleiberman, Vadim L Mett, Alan D Hutson, Anurag K Singh, Andrei V Gudkov, Lyudmila G Burdelya
Radiation treatment of head and neck cancer frequently causes severe collateral damage to normal tissues including mouth mucosa, salivary glands and skin. This toxicity limits the radiation dose that can be delivered and affects the patient's quality of life. Previous studies in mice and nonhuman primates showed that entolimod, a toll-like receptor 5 (TLR5) agonist derived from bacterial flagellin, effectively reduced radiation damage to hematopoietic and gastrointestinal tissues in both total-body and local irradiation scenarios, with no protection of tumors...
March 21, 2017: Radiation Research
https://www.readbyqxmd.com/read/28323576/tat-rasgap317-326-enhances-radiosensitivity-of-human-carcinoma-cell-lines-in-vitro-and-in-vivo-through-promotion-of-delayed-mitotic-cell-death
#4
Pelagia Tsoutsou, Alessandro Annibaldi, David Viertl, Jonathan Ollivier, Franz Buchegger, Marie-Catherine Vozenin, Jean Bourhis, Christian Widmann, Oscar Matzinger
The synthetic peptide TAT-RasGAP317-326 has been shown to potentiate the efficacy of anti-cancer drugs. In this study, we explored the action of TAT-RasGAP317-326 when combined with radiation by investigating its radiosensitizing activity in vitro and in vivo. To investigate the modulation of intrinsic radiosensitivity induced by TAT-RasGAP317-326, clonogenic assays were performed using four human cancer cell lines, HCT116 p53(+/+) (ATCC: CCL-247), HCT116 p53(-/-), PANC-1 (ATCC: CRL-1469) and HeLa (ATCC: CCL-2), as well as one nontumor cell line, HaCaT (CLS: 300493)...
March 21, 2017: Radiation Research
https://www.readbyqxmd.com/read/28323575/lung-laryngeal-and-other-respiratory-cancer-incidence-among-japanese-atomic-bomb-survivors-an-updated-analysis-from-1958-through-2009
#5
Elizabeth K Cahoon, Dale L Preston, Donald A Pierce, Eric Grant, Alina V Brenner, Kiyohiko Mabuchi, Mai Utada, Kotaro Ozasa
The Life Span Study (LSS) of Japanese atomic bomb survivors is comprised of a large, population-based cohort offering one of the best opportunities to study the relationship between exposure to radiation and incidence of respiratory cancers. Risks of lung, laryngeal and other cancers of the respiratory system were evaluated among 105,444 LSS subjects followed from 1958 to 2009. During this period, we identified 2,446 lung, 180 laryngeal and 115 other respiratory (trachea, mediastinum and other ill-defined sites) first primary incident cancer cases...
March 21, 2017: Radiation Research
https://www.readbyqxmd.com/read/28319463/solid-cancer-incidence-among-the-life-span-study-of-atomic-bomb-survivors-1958-2009
#6
Eric J Grant, Alina Brenner, Hiromi Sugiyama, Ritsu Sakata, Atsuko Sadakane, Mai Utada, Elizabeth K Cahoon, Caitlin M Milder, Midori Soda, Harry M Cullings, Dale L Preston, Kiyohiko Mabuchi, Kotaro Ozasa
This is the third analysis of solid cancer incidence among the Life Span Study (LSS) cohort of atomic bomb survivors in Hiroshima and Nagasaki, adding eleven years of follow-up data since the previously reported analysis. For this analysis, several changes and improvements were implemented, including updated dose estimates (DS02R1) and adjustment for smoking. Here, we focus on all solid cancers in aggregate. The eligible cohort included 105,444 subjects who were alive and had no known history of cancer at the start of follow-up...
March 20, 2017: Radiation Research
https://www.readbyqxmd.com/read/28319462/late-effects-of-exposure-to-ionizing-radiation-and-age-on-human-thymus-morphology-and-function
#7
Reiko Ito, Laura P Hale, Susan M Geyer, Jie Li, Andrew Sornborger, Junko Kajimura, Yoichiro Kusunoki, Kengo Yoshida, Marcel R M van den Brink, Seishi Kyoizumi, Nancy R Manley, Kei Nakachi, Gregory D Sempowski
The thymus is essential for proper development and maintenance of a T-cell repertoire that can respond to newly encountered antigens, but its function can be adversely affected by internal factors such as pregnancy and normal aging or by external stimuli such as stress, infection, chemotherapy and ionizing radiation. We have utilized a unique archive of thymus tissues, obtained from 165 individuals, exposed to the 1945 atomic bomb blast in Hiroshima, to study the long-term effects of receiving up to ∼3 Gy dose of ionizing radiation on human thymus function...
March 20, 2017: Radiation Research
https://www.readbyqxmd.com/read/28319461/monocytes-macrophages-mobilization-orchestrate-neovascularization-after-localized-colorectal-irradiation
#8
Céline Loinard, José Vilar, Fabien Milliat, Bernard Lévy, Marc Benderitter
In patients undergoing radiotherapy for cancer, radiation dose to healthy tissue can occur, causing microvascular damage. Monocytes that have been shown to promote tissue revascularization comprise the subsets: CD11b(+)Ly6G(-)7/4(hi)/monocytes(hi) and CD11b(+)Ly6G(-)7/4(lo)/monocytes(lo). We hypothesized that monocytes were implicated in postirradiation blood vessel formation. C57Bl6 mice underwent localized colorectal irradiation and were sacrificed at different times after exposure. Bone marrow, spleen, blood and colon were collected...
March 20, 2017: Radiation Research
https://www.readbyqxmd.com/read/28240558/the-causal-relationship-between-dna-damage-induction-in-bovine-lymphocytes-and-the-fukushima-nuclear-power-plant-accident
#9
Asako J Nakamura, Masatoshi Suzuki, Christophe E Redon, Yoshikazu Kuwahara, Hideaki Yamashiro, Yasuyuki Abe, Shintaro Takahashi, Tomokazu Fukuda, Emiko Isogai, William M Bonner, Manabu Fukumoto
The Fukushima Daiichi Nuclear Power Plant (FNPP) accident, the largest nuclear incident since the 1986 Chernobyl disaster, occurred when the plant was hit by a tsunami triggered by the Great East Japan Earthquake on March 11, 2011. The subsequent uncontrolled release of radioactive substances resulted in massive evacuations in a 20-km zone. To better understand the biological consequences of the FNPP accident, we have been measuring DNA damage levels in cattle in the evacuation zone. DNA damage was evaluated by assessing the levels of DNA double-strand breaks in peripheral blood lymphocytes by immunocytofluorescence-based quantification of γ-H2AX foci...
February 27, 2017: Radiation Research
https://www.readbyqxmd.com/read/28231026/late-administration-of-a-palladium-lipoic-acid-complex-poly-mva-modifies-cardiac-mitochondria-but-not-functional-or-structural-manifestations-of-radiation-induced-heart-disease-in-a-rat-model
#10
Vijayalakshmi Sridharan, John W Seawright, Francis J Antonawich, Merrill Garnett, Maohua Cao, Preeti Singh, Marjan Boerma
Exposure of the heart to ionizing radiation can cause adverse myocardial remodeling. In small animal models, local heart irradiation causes persistent alterations in cardiac mitochondrial function and swelling. POLY-MVA is a dietary supplement that contains a palladium lipoic acid complex that targets mitochondrial complex I and has been demonstrated to have greater redox potential than lipoic acid alone. POLY-MVA improves mitochondrial function and anti-oxidant enzyme activity in the aged rat heart. In this study, we tested whether POLY-MVA can mitigate cardiac effects of ionizing radiation...
February 23, 2017: Radiation Research
https://www.readbyqxmd.com/read/28231025/rabit-ii-implementation-of-a-high-throughput-micronucleus-biodosimetry-assay-on-commercial-biotech-robotic-systems
#11
Mikhail Repin, Sergey Pampou, Charles Karan, David J Brenner, Guy Garty
We demonstrate the use of high-throughput biodosimetry platforms based on commercial high-throughput/high-content screening robotic systems. The cytokinesis-block micronucleus (CBMN) assay, using only 20 μl whole blood from a fingerstick, was implemented on a PerkinElmer cell::explorer and General Electric IN Cell Analyzer 2000. On average 500 binucleated cells per sample were detected by our FluorQuantMN software. A calibration curve was generated in the radiation dose range up to 5.0 Gy using the data from 8 donors and 48,083 binucleated cells in total...
February 23, 2017: Radiation Research
https://www.readbyqxmd.com/read/28225655/mnte-2-pyp-treatment-or-nox4-inhibition-protects-against-radiation-induced-damage-in-mouse-primary-prostate-fibroblasts-by-inhibiting-the-tgf-beta-1-signaling-pathway
#12
Arpita Chatterjee, Elizabeth A Kosmacek, Rebecca E Oberley-Deegan
Prostate cancer patients who undergo radiotherapy frequently suffer from side effects caused by radiation-induced damage to normal tissues adjacent to the tumor. Exposure of these normal cells during radiation treatment can result in tissue fibrosis and cellular senescence, which ultimately leads to postirradiation-related chronic complications including urinary urgency and frequency, erectile dysfunction, urethral stricture and incontinence. Radiation-induced reactive oxygen species (ROS) have been reported as the most potent causative factor for radiation damage to normal tissue...
February 22, 2017: Radiation Research
https://www.readbyqxmd.com/read/28225654/germicidal-efficacy-and-mammalian-skin-safety-of-222-nm-uv-light
#13
Manuela Buonanno, Brian Ponnaiya, David Welch, Milda Stanislauskas, Gerhard Randers-Pehrson, Lubomir Smilenov, Franklin D Lowy, David M Owens, David J Brenner
We have previously shown that 207-nm ultraviolet (UV) light has similar antimicrobial properties as typical germicidal UV light (254 nm), but without inducing mammalian skin damage. The biophysical rationale is based on the limited penetration distance of 207-nm light in biological samples (e.g. stratum corneum) compared with that of 254-nm light. Here we extended our previous studies to 222-nm light and tested the hypothesis that there exists a narrow wavelength window in the far-UVC region, from around 200-222 nm, which is significantly harmful to bacteria, but without damaging cells in tissues...
February 22, 2017: Radiation Research
https://www.readbyqxmd.com/read/28225650/nicaraven-a-potential-radioprotective-agent-has-very-limited-effects-on-the-survival-of-cancer-cells-and-the-growth-of-established-tumors
#14
Chen Yan, Lan Luo, Yoshishige Urata, Shinji Goto, Chang-Ying Guo, Tao-Sheng Li
Radiotherapy is one of the major treatment modalities for the management of various cancers, however, it is limited by the severe side effects and complications experienced by some patients. Nicaraven, a chemically synthesized hydroxyl radical-specific scavenger, has been shown to protect normal tissues from radiation-induced injury. We investigated the role of nicaraven in cancer cells and tumor growth. While nicaraven did not significantly change the colony-forming abilities and DNA damage levels in several cancer cell lines after irradiation, it significantly protected mouse bone marrow-derived hematopoietic stem cells from radiation injury...
February 22, 2017: Radiation Research
https://www.readbyqxmd.com/read/28218889/scaling-human-cancer-risks-from-low-let-to-high-let-when-dose-effect-relationships-are-complex
#15
Igor Shuryak, Albert J Fornace, Kamal Datta, Shubhankar Suman, Santosh Kumar, Rainer K Sachs, David J Brenner
Health risks from space radiations, particularly from densely ionizing radiations, represent an important challenge for long-ranged manned space missions. Reliable methods are needed for scaling low-LET to high-LET radiation risks for humans, based on animal or in vitro studies comparing these radiations. The current standard metric, relative biological effectiveness (RBE) compares iso-effect doses of two radiations. By contrast, a proposed new metric, radiation effects ratio (RER), compares effects of two radiations at the same dose...
February 20, 2017: Radiation Research
https://www.readbyqxmd.com/read/28218888/using-clinical-signs-and-symptoms-for-medical-management-of-radiation-casualties-2015-nato-exercise
#16
H Dörr, M Abend, W F Blakely, D L Bolduc, D Boozer, T Costeira, T Dant, A De Amicis, S De Sanctis, M Dondey, M Drouet, F Entine, S Francois, G Gagna, N Guitard, F Hérodin, M Hoefer, A Lamkowski, G La Sala, F Lista, P Loiacono, M Majewski, P Martigne, D Métivier, X Michel, J Pateux, J Pejchal, G Reeves, D Riccobono, Z Sinkorova, L Soyez, D Stricklin, A Tichy, M Valente, C R Woodruff, L Zarybnicka, M Port
The utility of early-phase (≤5 days) radiation-induced clinical signs and symptoms (e.g., vomiting, diarrhea, erythema and changes in blood cell counts) was examined for the prediction of later occurring acute radiation syndrome (ARS) severity and the development of medical management strategies. Medical treatment protocols for radiation accident victims (METREPOL) was used to grade ARS severities, which were assigned response categories (RCs). Data on individuals (n = 191) with mild (RC1, n = 45), moderate (RC2, n = 19), severe (RC3, n = 20) and fatal (RC4, n = 18) ARS, as well as nonexposed individuals (RC0, n = 89) were generated using either METREPOL (n = 167) or the system for evaluation and archiving of radiation accidents based on case histories (SEARCH) database (n = 24), the latter comprised of real-case descriptions...
February 20, 2017: Radiation Research
https://www.readbyqxmd.com/read/28218887/pathology-of-serially-sacrificed-female-b6c3f1-mice-chronically-exposed-to-very-low-dose-rate-gamma-rays
#17
I B Tanaka, J Komura, S Tanaka
We have previously reported on life span shortening as well as increased incidence rates in several neoplasms in B6C3F1 mice that were continuously exposed to 21 mGy/day of gamma rays for 400 days. To clarify whether the life shortening was due to early appearance of neoplasms (shortened latency) or increased promotion/progression, 8-week-old female specific-pathogen-free B6C3F1 mice were gamma-ray irradiated at a low dose rate of 20 mGy/day for 400 days. At 100 days postirradiation, 60-90 mice were sacrificed, and thereafter every 100 days alongside the age-matched nonirradiated controls, for 700 days...
February 20, 2017: Radiation Research
https://www.readbyqxmd.com/read/28211757/mice-and-the-a-bomb-irradiation-systems-for-realistic-exposure-scenarios
#18
Guy Garty, Yanping Xu, Carl Elliston, Stephen A Marino, Gerhard Randers-Pehrson, David J Brenner
Validation of biodosimetry assays is normally performed with acute exposures to uniform external photon fields. Realistically, exposure to a radiological dispersal device or reactor leak will include exposure to low dose rates and likely exposure to ingested radionuclides. An improvised nuclear device will likely include a significant neutron component in addition to a mixture of high- and low-dose-rate photons and ingested radionuclides. We present here several novel irradiation systems developed at the Center for High Throughput Minimally Invasive Radiation Biodosimetry to provide more realistic exposures for testing of novel biodosimetric assays...
February 17, 2017: Radiation Research
https://www.readbyqxmd.com/read/28208025/aeol-10150-mitigates-radiation-induced-lung-injury-in-the-nonhuman-primate-morbidity-and-mortality-are-administration-schedule-dependent
#19
Thomas J MacVittie, Allison Gibbs, Ann M Farese, Kory Barrow, Alexander Bennett, Cheryl Taylor-Howell, Abdul Kazi, Karl Prado, George Parker, William Jackson Iii
Pneumonitis and fibrosis are potentially lethal, delayed effects of acute radiation exposure. In this study, male rhesus macaques received whole-thorax lung irradiation (WTLI) with a target dose of 10.74 Gy prescribed to midplane at a dose rate of 0.80 ± 0.05 Gy/min using 6 MV linear accelerator-derived photons. The study design was comprised of four animal cohorts: one control and three treated with AEOL 10150 (n = 20 animals per cohort). AEOL 10150, a metalloporphyrin antioxidant, superoxide dismutase mimetic was administered by daily subcutaneous injection at 5 mg/kg in each of three schedules, beginning 24 ± 2 h postirradiation: from day 1 to day 28, day 1 to day 60 or a divided regimen from day 1 to day 28 plus day 60 to day 88...
February 16, 2017: Radiation Research
https://www.readbyqxmd.com/read/28186469/blood-based-nucleic-acid-biomarkers-as-a-potential-tool-to-determine-radiation-therapy-response-in-non-small-cell-lung-cancer
#20
Christopher R Deig, Marc S Mendonca, Tim Lautenschlaeger
Lung cancer is the leading cause of cancer deaths worldwide, with smoking as the main risk factor. The use of low-dose computed tomography (LDCT) as a screening method has shown a 20% lung cancer specific mortality benefit; however, widespread implementation is estimated to add $1.3-$2.0 billion in annual national health care expenditures. Blood-based microRNAs (miRNAs), have been investigated in detail and found to be potentially useful biomarkers indicating the presence of lung cancer, especially when used as a companion test to LDCT...
February 10, 2017: Radiation Research
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