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ionizing radiation exposure

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https://www.readbyqxmd.com/read/28811997/estimation-of-kidneys-and-urinary-bladder-doses-based-on-the-region-of-interest-in-18-fluorine-fluorodeoxyglucose-positron-emission-tomography-computed-tomography-examination-a-preliminary-study
#1
Farida Aimi Mustapha, Farahnaz Ahmad Anwar Bashah, Ihsan M Yassin, Ahmad Saad Fathinul Fikri, Abdul Jalil Nordin, Hairil Rashmizal Abdul Razak
BACKGROUND: Kidneys and urinary bladder are common physiologic uptake sites of 18fluorine-fluorodeoxyglucose ((18)F-FDG) causing increased exposure of low energy ionizing radiation to these organs. Accurate measurement of organ dose is vital as (18)F-FDG is directly exposed to the organs. Organ dose from (18)F-FDG PET is calculated according to the injected (18)F-FDG activity with the application of dose coefficients established by International Commission on Radiological Protection (ICRP)...
June 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28808622/radiation-exposure-and-reduction-in-the-operating-room-perspectives-and-future-directions-in-spine-surgery
#2
REVIEW
Ankur S Narain, Fady Y Hijji, Kelly H Yom, Krishna T Kudaravalli, Brittany E Haws, Kern Singh
Intraoperative imaging is vital for accurate placement of instrumentation in spine surgery. However, the use of biplanar fluoroscopy and other intraoperative imaging modalities is associated with the risk of significant radiation exposure in the patient, surgeon, and surgical staff. Radiation exposure in the form of ionizing radiation can lead to cellular damage via the induction of DNA lesions and the production of reactive oxygen species. These effects often result in cell death or genomic instability, leading to various radiation-associated pathologies including an increased risk of malignancy...
July 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28801517/effect-of-densely-ionizing-radiation-on-cardiomyocyte-differentiation-from-human-induced-pluripotent-stem-cells
#3
Erdene Baljinnyam, Sundararajan Venkatesh, Richard Gordan, Satvik Mareedu, Jianyi Zhang, Lai-Hua Xie, Edouard I Azzam, Carolyn K Suzuki, Diego Fraidenraich
The process of human cardiac development can be faithfully recapitulated in a culture dish with human pluripotent stem cells, where the impact of environmental stressors can be evaluated. The consequences of ionizing radiation exposure on human cardiac differentiation are largely unknown. In this study, human-induced pluripotent stem cell cultures (hiPSCs) were subjected to an external beam of 3.7 MeV α-particles at low mean absorbed doses of 0.5, 3, and 10 cGy. Subsequently, the hiPSCs were differentiated into beating cardiac myocytes (hiPSC-CMs)...
August 2017: Physiological Reports
https://www.readbyqxmd.com/read/28800787/mir-449a-suppresses-ldha-mediated-glycolysis-to-enhance-the-sensitivity-of-non-small-cell-lung-cancer-cells-to-ionizing-radiation
#4
Liang Li, Huijuan Liu, Lianjiang Du, Pan Xi, Qian Wang, Yanqin Li, Di Liu
MicroRNA dysregulation contributes to malignant progression, dissemination and profound treatment resistance in multiple cancers. MiR-449a is recognized as a tumor suppresser. However, roles of miR-449a in lung cancers initiation and progression are largely unrevealed. Our study aims to investigate roles and the underlying mechanism of miR-449a in modulating sensitivity to ionizing radiation (IR) in non-small cell lung cancers (NSCLC). Lung cancer cells were transfected with miR-449a mimics or negative control and exposed to IR, levels of target protein, glycolysis, cell viability, apoptosis and DNA damage were examined...
August 11, 2017: Oncology Research
https://www.readbyqxmd.com/read/28796249/rho-inhibition-by-lovastatin-affects-apoptosis-and-dsb-repair-of-primary-human-lung-cells-in-vitro-and-lung-tissue-in-vivo-following-fractionated-irradiation
#5
Verena Ziegler, Christian Henninger, Ioannis Simiantonakis, Marcel Buchholzer, Mohammad Reza Ahmadian, Wilfried Budach, Gerhard Fritz
Thoracic radiotherapy causes damage of normal lung tissue, which limits the cumulative radiation dose and, hence, confines the anticancer efficacy of radiotherapy and impacts the quality of life of tumor patients. Ras-homologous (Rho) small GTPases regulate multiple stress responses and cell death. Therefore, we investigated whether pharmacological targeting of Rho signaling by the HMG-CoA-reductase inhibitor lovastatin influences ionizing radiation (IR)-induced toxicity in primary human lung fibroblasts, lung epithelial and lung microvascular endothelial cells in vitro and subchronic mouse lung tissue damage following hypo-fractionated irradiation (4x4 Gy)...
August 10, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28795583/regulation-of-cell-survival-apoptosis-and-epithelial-to-mesenchymal-transition-by-nitric-oxide-dependent-post-translational-modifications
#6
Raul González, Francisco J Molina-Ruiz, Jose Antonio Barcena Ruiz, C Alicia Padilla, Jordi Muntané
SIGNIFICANCE: Nitric oxide (NO) is a physiopathological messenger generating different reactive nitrogen species (RNS) according to hypoxic, acidic and redox conditions. Recent Advances: RNS and reactive oxygen species (ROS) promote relevant post-translational modifications, such as nitrosation, nitration and oxidation, in critical components of cell proliferation and death, epithelial to mesenchymal transition and metastasis. CRITICAL ISSUES: The pro- or antitumoral properties of NO are dependent on local concentration, redox state, cellular status, duration of exposure and compartmentalization of NO generation...
August 10, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28795481/robotic-technology-in-interventional-cardiology-current-status-and-future-perspectives
#7
Ehtisham Mahmud, Ali Pourdjabbar, Lawrence Ang, Omid Behnamfar, Mitul P Patel, Ryan R Reeves
Robotic technology has been utilized in cardiovascular medicine for over a decade, and over that period, its use has been expanded to percutaneous coronary and peripheral vascular interventions. The safety and feasibility of robotically assisted percutaneous cardiovascular interventions has been demonstrated in studies including simple to complex coronary lesions, and both iliac and femoropopliteal lesions. These reports have shown that robotically assisted PCI significantly reduces operator exposure to harmful ionizing radiation without a detrimental effect on procedural success or clinical efficacy...
August 10, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28790924/effects-of-ionizing-irradiation-on-mouse-diaphragmatic-skeletal-muscle
#8
Tingyang Zhou, Lanchun Lu, Shiyong Wu, Li Zuo
Undesirable exposure of diaphragm to radiation during thoracic radiation therapy has not been fully considered over the past decades. Our study aims to examine the potential biological effects on diaphragm induced by radiation. One-time ionizing irradiation of 10 Gy was applied either to the diaphragmatic region of mice or to the cultured C2C12 myocytes. Each sample was then assayed for muscle function, oxidative stress, or cell viability on days 1, 3, 5, and 7 after irradiation. Our mouse model shows that radiation significantly reduced muscle function on the 5th and 7th days and increased reactive oxygen species (ROS) formation in the diaphragm tissue from days 3 to 7...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28780694/dose-rate-effects-of-low-let-ionizing-radiation-on-fish-cells
#9
Nguyen T K Vo, Colin B Seymour, Carmel E Mothersill
Radiobiological responses of a highly clonogenic fish cell line, eelB, to low-LET ionizing radiation and effects of dose rates were studied. In acute exposure to 0.1-12 Gy of gamma rays, eelB's cell survival curve displayed a linear-quadratic (LQ) relationship. In the LQ model, α, β, and α/β ratio were 0.0024, 0.037, and 0.065, respectively; for the first time that these values were reported for fish cells. In the multi-target model, n, D o, and D q values were determined to be 4.42, 2.16, and 3.21 Gy, respectively, and were the smallest among fish cell lines being examined to date...
August 5, 2017: Radiation and Environmental Biophysics
https://www.readbyqxmd.com/read/28780164/changes-in-epigenetic-markers-dnmt1-and-hdac1-2-in-the-adult-mouse-hippocampus-after-cranial-irradiation
#10
Sohi Kang, Yeonghoon Son, Sueun Lee, Juhwan Kim, Jong-Choon Kim, Joong-Sun Kim, Uhee Jung, Sung-Ho Kim, Miyoung Yang, Changjong Moon
Brain exposure to ionizing radiation can cause functional deficits in the hippocampus, including memory impairment. However, the specific molecular mechanisms underlying irradiation-induced cognitive impairments are largely unknown. Changes in DNA methyltransferases (DNMTs) and histone deacetylases (HDACs), which are involved in DNA methylation and histone remodeling, may be associated with behavioral changes in learning and memory. We assessed changes in the levels of enzymes associated with the epigenetic modification of gene expression, including DNMT1, HDAC1, HDAC2, Sirtuin 1 (SIRT1), and acetylated histone H3 (Ace-H3) in the mouse hippocampus 1 and 30days after a single exposure to cranial irradiation (0 or 10Gy)...
August 2, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28779875/paths-from-dna-damage-and-signaling-to-genome-rearrangements-via-homologous-recombination
#11
REVIEW
Jac A Nickoloff
DNA damage is a constant threat to genome integrity. DNA repair and damage signaling networks play a central role maintaining genome stability, suppressing tumorigenesis, and determining tumor response to common cancer chemotherapeutic agents and radiotherapy. DNA double-strand breaks (DSBs) are critical lesions induced by ionizing radiation and when replication forks encounter damage. DSBs can result in mutations and large-scale genome rearrangements reflecting mis-repair by non-homologous end joining or homologous recombination...
July 24, 2017: Mutation Research
https://www.readbyqxmd.com/read/28775198/dna-repair-following-exposure-to-ionizing-radiation-is-not-error-free
#12
James Richard Duncan, Michael R Lieber, Noritaka Adachi, Richard L Wahl
No abstract text is available yet for this article.
August 3, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28774592/vitamin-d3-produced-by-skin-exposure-to-uvr-inhibits-murine-basal-cell-carcinoma-carcinogenesis
#13
Anastasia Makarova, Grace Wang, John A Dolorito, Subheksha Kc, Eileen Libove, Ervin H Epstein
The effect of ultraviolet radiation (UVR) on human basal cell carcinoma (BCC) epidemiology is complex - the incidence rises until approximately 30,000 hours of lifetime sunlight exposure and then plateaus. We hypothesize that UVR has opposing effects on BCC carcinogenesis - stimulatory via mutagenesis, etc. and inhibitory via production of hedgehog-inhibiting vitamin D3 (D3). We find that UVR exposure of ionizing radiation (IR)-treated Ptch1(+/-) mice accelerates BCC carcinogenesis in male mice, in which UVR does not produce D3...
July 31, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28771181/ghrelin-therapy-decreases-incidents-of-intracranial-hemorrhage-in-mice-after-whole-body-ionizing-irradiation-combined-with-burn-trauma
#14
Nikolai V Gorbunov, Juliann G Kiang
Nuclear industrial accidents and the detonation of nuclear devices cause a variety of damaging factors which, when their impacts are combined, produce complicated injuries challenging for medical treatment. Thus, trauma following acute ionizing irradiation (IR) can deteriorate the IR-induced secondary reactive metabolic and inflammatory impacts to dose-limiting tissues, such as bone marrow/lymphatic, gastrointestinal tissues, and vascular endothelial tissues, exacerbating the severity of the primary injury and decreasing survival from the exposure...
August 3, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28771086/exposure-to-low-dose-x-ray-radiation-alters-bone-progenitor-cells-and-bone-microarchitecture
#15
Florence Lima, Joshua M Swift, Elisabeth S Greene, Matthew R Allen, David A Cunningham, Leslie A Braby, Susan A Bloomfield
Exposure to high-dose ionizing radiation during medical treatment exerts well-documented deleterious effects on bone health, reducing bone density and contributing to bone growth retardation in young patients and spontaneous fracture in postmenopausal women. However, the majority of human radiation exposures occur in a much lower dose range than that used in the radiation oncology clinic. Furthermore, very few studies have examined the effects of low-dose ionizing radiation on bone integrity and results have been inconsistent...
August 3, 2017: Radiation Research
https://www.readbyqxmd.com/read/28766757/sesamol-ameliorates-radiation-induced-dna-damage-in-hematopoietic-system-of-whole-body-%C3%AE-irradiated-mice
#16
Arun Kumar, Sandeep Choudhary, Jawahar S Adhikari, Nabo K Chaudhury
Ionizing radiation exposure is harmful and at high doses can lead to acute hematopoietic radiation syndrome. Therefore, agents that can protect hematopoietic system are important for development of radioprotector. Sesamol is a potential molecule for development of radioprotector due to its strong free radical scavenging and antioxidant properties. In the present study, sesamol was evaluated for its role in DNA damage and repair in hematopoietic system of γ-irradiated CB57BL/6 mice and compared with amifostine...
August 2, 2017: Environmental and Molecular Mutagenesis
https://www.readbyqxmd.com/read/28764606/low-dose-radiation-induced-risk-in-spermatogenesis
#17
Hisanori Fukunaga, Karl T Butterworth, Akinari Yokoya, Takehiko Ogawa, Kevin M Prise
PURPOSE: To discuss low-dose radiation-induced risks to male fertility focusing on potential mechanisms of low-dose radiation-induced damage on spermatogenesis, epidemiological studies of environmental radiation effects on sperm parameters and transgenerational effects following exposure of spermatogonial stem cells (SSCs). BACKGROUND: Spermatogenesis produces mature male gametes, spermatozoa, which fertilize their counterpart female gametes, oocytes. The robust maintenance system of spermatogenesis is essential for genomic conservation; however, male fertility can be readily impacted by exposure to environmental, chemical and physical factors including ionizing radiation...
August 2, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/28763418/tracking-cumulative-radiation-exposure-in-orthopaedic-surgeons-and-residents-what-dose-are-we-getting
#18
Elizabeth B Gausden, Alexander B Christ, Roseann Zeldin, Joseph M Lane, Moira M McCarthy
BACKGROUND: The purpose of this study was to determine the amount of cumulative radiation exposure received by orthopaedic surgeons and residents in various subspecialties. We obtained dosimeter measures over 12 months on 24 residents and 16 attending surgeons. METHODS: Monthly radiation exposure was measured over a 12-month period for 24 orthopaedic residents and 16 orthopaedic attending surgeons. The participants wore a Landauer Luxel dosimeter on the breast pocket of their lead apron...
August 2, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28758831/tet1-deficiency-attenuates-the-dna-damage-response-and-promotes-resistance-to-dna-damaging-agents
#19
Jonathan B Coulter, Hernando Lopez-Bertoni, Katherine J Kuhns, Richard S Lee, John Laterra, Joseph P Bressler
Recent studies have shown that loss of TET1 may play a significant role in the formation of tumors. Because genomic instability is a hallmark of cancer, we examined the potential involvement of ten-eleven translocation 1 (TET1) in the DNA damage response (DDR). Here we demonstrate that, in response to clinically relevant doses of ionizing radiation (IR), human glial cells made TET1-deficient with lentiviral vectors displayed greater numbers of colony forming units and lower levels of apoptotic markers compared to glial cells transduced with control vectors; yet, they harbored greater DNA strand breaks...
July 31, 2017: Epigenetics: Official Journal of the DNA Methylation Society
https://www.readbyqxmd.com/read/28756339/whole-body-mri-for-systemic-staging-of-breast-cancer-in-pregnant-women
#20
Fedro A Peccatori, Giovanni Codacci-Pisanelli, Maria Del Grande, Giovanna Scarfone, Fabio Zugni, Giuseppe Petralia
When breast cancer is diagnosed during pregnancy, treatment should be as close; as possible to what is used in non-pregnant patients. This requires accurate local and systemic staging: ultrasound (US) is used for local staging and allows adequate evaluation of the liver and pelvis, but chest and bones cannot be explored and imaging techniques involving exposure to ionizing radiation would be needed. However, since imaging techniques involving ionizing radiation and the use of radionuclides should be limited, whole body magnetic resonance imaging (WB-MRI) without administration of contrast agent represents a very interesting alternative, but limited data is available...
July 27, 2017: Breast: Official Journal of the European Society of Mastology
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