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Journal of Radiation Research

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https://www.readbyqxmd.com/read/28637346/an-ion-beam-induced-arabidopsis-mutant-with-marked-chromosomal-rearrangement
#1
Ayako N Sakamoto, Vo Thi Thuong Lan, Satoru Fujimoto, Sachihiro Matsunaga, Atsushi Tanaka
Ion beams have been used as an effective tool in mutation breeding for the creation of crops with novel characteristics. Recent analyses have revealed that ion beams induce large chromosomal alterations, in addition to small mutations comprising base changes or frameshifts. In an effort to understand the potential capability of ion beams, we analyzed an Arabidopsis mutant possessing an abnormal genetic trait. The Arabidopsis mutant uvh3-2 is hypersensitive to UVB radiation when photoreactivation is unavailable...
June 15, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28595311/evaluation-of-rectum-and-bladder-dose-accumulation-from-external-beam-radiotherapy-and-brachytherapy-for-cervical-cancer-using-two-different-deformable-image-registration-techniques
#2
Noriyuki Kadoya, YuYa Miyasaka, Takaya Yamamoto, Yoshihiro Kuroda, Kengo Ito, Mizuki Chiba, Yujiro Nakajima, Noriyoshi Takahashi, Masaki Kubozono, Rei Umezawa, Suguru Dobashi, Ken Takeda, Keiichi Jingu
We evaluated dose-volume histogram (DVH) parameters based on deformable image registration (DIR) between brachytherapy (BT) and external beam radiotherapy (EBRT) that included a center-shielded (CS) plan. Eleven cervical cancer patients were treated with BT, and their pelvic and CS EBRT were studied. Planning CT images for EBRT and BT (except for the first BT, used as the reference image) were deformed with DIR to reference image. We used two DIR parameter settings: intensity-based and hybrid. Mean Dice similarity coefficients (DSCs) comparing EBRT with the reference for the uterus, rectum and bladder were 0...
June 8, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28595296/impact-of-time-interval-and-dose-rate-on-cell-survival-following-low-dose-fractionated-exposures
#3
Shingo Terashima, Yoichiro Hosokawa, Eichi Tsuruga, Yasushi Mariya, Toshiya Nakamura
Enhanced cell lethality, also known as hyper-radiosensitivity, has been reported at low doses of radiation (≤0.5 Gy) in various cell lines, and is expected to be an effective cancer therapy. We conducted this study to examine the impact of time interval and dose rate of low-dose fractionated exposures with a short time interval. We evaluated the cell-survival rates of V79 and A549 cells using clonogenic assays. We performed fractionated exposures in unit doses of 0.25, 0.5, 1.0 and 2.0 Gy. We exposed the cells to 2 Gy of X-rays (i) at dose-rates of 1...
June 8, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28541506/differences-in-responses-to-x-ray-exposure-between-osteoclast-and-osteoblast-cells
#4
Jian Zhang, Ziyang Wang, Anqing Wu, Jing Nie, Hailong Pei, Wentao Hu, Bing Wang, Peng Shang, Bingyan Li, Guangming Zhou
Radiation-induced bone loss is a potential health concern for cancer patients undergoing radiotherapy. Enhanced bone resorption by osteoclasts and decreased bone formation by osteoblasts were thought to be the main reasons. In this study, we showed that both pre-differentiating and differentiating osteoclasts were relatively sensitive to X-rays compared with osteoblasts. X-rays decreased cell viability to a greater degree in RAW264.7 cells and in differentiating cells than than in osteoblastic MC3T3-E1 cells...
May 25, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28510700/enhanced-biological-activities-of-gamma-irradiated-persimmon-leaf-extract
#5
Byoung-Ok Cho, Denis Nchang Che, Hong-Hua Yin, Seon-Il Jang
The aim of this study was to compare the anti-oxidative and anti-inflammatory activities of gamma-irradiated persimmon leaf extract (GPLE) with those of non-irradiated persimmon leaf extract (PLE). Ethanolic extract of persimmon leaf was exposed to gamma irradiation at a dose of 10 kGy. After gamma irradiation, the color of the extract changed from dark brown to light brown. The anti-oxidative and anti-inflammatory activities of GPLE and PLE were assessed from: total polyphenol and total flavonoid contents; 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay; 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) assay, and levels of pro-inflammatory mediators such as nitric oxide (NO), prostaglandin E2 (PGE2), tumor necrosis factor alpha (TNF-α) and interleukin-6 (IL-6)...
May 16, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28498931/protective-effects-of-hot-spring-water-drinking-and-radon-inhalation-on-ethanol-induced-gastric-mucosal-injury-in-mice
#6
Reo Etani, Takahiro Kataoka, Norie Kanzaki, Akihiro Sakoda, Hiroshi Tanaka, Yuu Ishimori, Fumihiro Mitsunobu, Takehito Taguchi, Kiyonori Yamaoka
Radon therapy using radon (222Rn) gas is classified into two types of treatment: inhalation of radon gas and drinking water containing radon. Although short- or long-term intake of spa water is effective in increasing gastric mucosal blood flow, and spa water therapy is useful for treating chronic gastritis and gastric ulcer, the underlying mechanisms for and precise effects of radon protection against mucosal injury are unclear. In the present study, we examined the protective effects of hot spring water drinking and radon inhalation on ethanol-induced gastric mucosal injury in mice...
May 12, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28482074/carbon-ion-irradiation-abrogates-lin28b-induced-x-ray-resistance-in-melanoma-cells
#7
Seong-Joon Park, Kyu Heo, Chulwon Choi, Kwangmo Yang, Akiko Adachi, Hiroko Okada, Yukari Yoshida, Tatsuya Ohno, Takashi Nakano, Akihisa Takahashi
The Lin28/let-7 axis plays an important role in tumor initiation and developmental processes. Lin28B is upregulated in a variety of cancers, and its overexpression enhances cancer cell proliferation and radioresistance through the suppression of let-7 micro RNA expression. In this study, we investigated the role of the Lin28/let7 axis as a target for radiosensitization of melanoma cancer cells. The overexpression of Lin28B reduced mature let-7 microRNA expression in melanoma cell lines, and enhanced the sphere-forming ability of melanoma cell lines, which is a characteristic of cancer stem cell (CSC) populations...
May 8, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28472381/a-simulation-study-on-the-dosimetric-benefit-of-real-time-motion-compensation-in-spot-scanning-proton-therapy-for-prostate
#8
Yusuke Fujii, Taeko Matsuura, Seishin Takao, Yuka Matsuzaki, Takaaki Fujii, Naoki Miyamoto, Kikuo Umegaki, Kentaro Nishioka, Shinichi Shimizu, Hiroki Shirato
For proton spot scanning, use of a real-time-image gating technique incorporating an implanted marker and dual fluoroscopy facilitates mitigation of the dose distribution deterioration caused by interplay effects. This study explored the advantages of using a real-time-image gating technique, with a focus on prostate cancer. Two patient-positioning methods using fiducial markers were compared: (i) patient positioning only before beam delivery, and (ii) patient positioning both before and during beam delivery using a real-time-gating technique...
May 4, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28339761/combined-modality-therapy-in-stage-iiia-non-small-cell-lung-cancer-clarity-or-confusion-despite-the-highest-level-of-evidence
#9
Branislav Jeremic, Francesc Casas, Pavol Dubinsky, Antonio Gomez-Caamano, Nikola Cihoric, Gregory Videtic, Miroslav Latinovic
Recent years have witnessed a number of clinical trials in Stage IIIA non-small cell lung cancer (NSCLC) comparing (A) induction chemotherapy (CHT) with induction CHT and radiotherapy (RT), each followed by surgery; (B) either induction CHT or induction RT-CHT, each followed by surgery, with definitive RT-CHT (no surgery). Due to the heterogeneity of patient, tumor and treatment characteristics across these trials, various meta-analyses (MAs) have been performed to define the optimal treatment approach in this setting for this clinical presentation...
May 1, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28122968/phosphoprotein-profiles-of-candidate-markers-for-early-cellular-responses-to-low-dose-%C3%AE-radiation-in-normal-human-fibroblast-cells
#10
Ji-Hye Yim, Jung Mi Yun, Ji Young Kim, In Kyung Lee, Seon Young Nam, Cha Soon Kim
Ionizing radiation causes biological damage that leads to severe health effects. However, the effects and subsequent health implications caused by exposure to low-dose radiation are unclear. The objective of this study was to determine phosphoprotein profiles in normal human fibroblast cell lines in response to low-dose and high-dose γ-radiation. We examined the cellular response in MRC-5 cells 0.5 h after exposure to 0.05 or 2 Gy. Using 1318 antibodies by antibody array, we observed ≥1.3-fold increases in a number of identified phosphoproteins in cells subjected to low-dose (0...
May 1, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/28077627/a-feasibility-study-on-the-use-of-phantoms-with-statistical-lung-masses-for-determining-the-uncertainty-in-the-dose-absorbed-by-the-lung-from-broad-beams-of-incident-photons-and-neutrons
#11
Atiyeh Ebrahimi Khankook, Hashem Miri Hakimabad, Laleh Rafat Motavalli
Computational models of the human body have gradually become crucial in the evaluation of doses absorbed by organs. However, individuals may differ considerably in terms of organ size and shape. In this study, the authors sought to determine the energy-dependent standard deviations due to lung size of the dose absorbed by the lung during external photon and neutron beam exposures. One hundred lungs with different masses were prepared and located in an adult male International Commission on Radiological Protection (ICRP) reference phantom...
May 1, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/27974510/modeling-cell-survival-and-change-in-amount-of-dna-during-protracted-irradiation
#12
Yusuke Matsuya, Kaori Tsutsumi, Kohei Sasaki, Yuji Yoshii, Takaaki Kimura, Hiroyuki Date
Hyper-radiosensitivity (HRS) is a well-known bioresponse under low-dose or low-dose-rate exposures. Although disorder of the DNA repair function, non-targeted effects and accumulation of cells in G2 have been experimentally observed, the mechanism for inducing HRS by long-term irradiation is still unclear. On the basis of biological experiments and a theoretical study, we have shown that change in the amount of DNA associated with accumulation of cells in G2 enhances radiosensitivity. To demonstrate continuous irradiation with 250 kVp X-rays, we adopted a fractionated regimen of 0...
May 1, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/27974509/proton-beam-therapy-for-liver-metastases-from-gastric-cancer
#13
Nobuyoshi Fukumitsu, Toshiyuki Okumura, Daichi Takizawa, Haruko Numajiri, Kayoko Ohnishi, Masashi Mizumoto, Teruhito Aihara, Hitoshi Ishikawa, Koji Tsuboi, Hideyuki Sakurai
Liver metastases from gastric cancer (LMGC) is a non-curable, fatal disease with a 5-year survival rate of <10%. Although various local treatments have been applied, their clinical utility has not been established. The purpose of this study was to investigate the safety and effectiveness of proton beam therapy (PBT) for the treatment of patients with LMGC. A total of nine patients (seven men, two women; aged 56-78 years) with LMGC who received PBT between 2002 and 2012 were retrospectively reviewed. Patients who had tumors confined to the liver were investigated, and patients who had extrahepatic tumors were excluded...
May 1, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/27974505/metabolomic-screening-using-esi-ft-ms-identifies-potential-radiation-responsive-molecules-in-mouse-urine
#14
Daisuke Iizuka, Susumu Yoshioka, Hidehiko Kawai, Shunsuke Izumi, Fumio Suzuki, Kenji Kamiya
The demand for establishment of high-throughput biodosimetric methods is increasing. Our aim in this study was to identify low-molecular-weight urinary radiation-responsive molecules using electrospray ionization Fourier transform mass spectrometry (ESI-FT MS), and our final goal was to develop a sensitive biodosimetry technique that can be applied in the early triage of a radiation emergency medical system. We identified nine metabolites by statistical comparison of mouse urine before and 8 h after irradiation...
May 1, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/27974504/analysis-of-the-mechanism-of-radiation-induced-upregulation-of-mitochondrial-abundance-in-mouse-fibroblasts
#15
Tohru Yamamori, Tomoya Sasagawa, Osamu Ichii, Mie Hiyoshi, Tomoki Bo, Hironobu Yasui, Yasuhiro Kon, Osamu Inanami
Mitochondria strongly contribute to the maintenance of cellular integrity through various mechanisms, including oxidative adenosine triphosphate production and calcium homeostasis regulation. Therefore, proper regulation of the abundance, distribution and activity of mitochondria is crucial for the maintenance of cellular homeostasis. Previous studies have shown that ionizing radiation (IR) alters mitochondrial functions, suggesting that mitochondria are likely to be an important target of IR. Though IR reportedly influences cellular mitochondrial abundance, the mechanism remains largely unknown...
May 1, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/27864508/radiotherapy-using-imrt-boosts-after-hyperbaric-oxygen-therapy-with-chemotherapy-for-glioblastoma
#16
Katsuya Yahara, Takayuki Ohguri, Hiroki Udono, Junkoh Yamamoto, Kyosuke Tomura, Toshihiro Onoda, Hajime Imada, Shigeru Nishizawa, Yukunori Korogi
The purpose of this study was to evaluate the feasibility and efficacy of radiotherapy (RT) using intensity-modulated radiotherapy (IMRT) boosts after hyperbaric oxygen (HBO) therapy with chemotherapy in patients with glioblastoma. Twenty-four patients with glioblastoma were treated with the combined therapy, which was RT using IMRT boosts after HBO with chemotherapy, and were retrospectively analyzed. The RT protocol was as follows: first, 3D conformal RT [40 Gy/20 fractions (fr)] was delivered to the gross tumor volume (GTV) and the surrounding edema, including an additional 1...
May 1, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/27864507/multicentre-dose-audit-for-clinical-trials-of-radiation-therapy-in-asia
#17
Hideyuki Mizuno, Shigekazu Fukuda, Akifumi Fukumura, Yuzuru-Kutsutani Nakamura, Cao Jianping, Chul-Koo Cho, Nana Supriana, To Anh Dung, Miriam Joy Calaguas, C R Beena Devi, Yaowalak Chansilpa, Parvin Akhter Banu, Masooma Riaz, Surya Esentayeva, Shingo Kato, Kumiko Karasawa, Hirohiko Tsujii
A dose audit of 16 facilities in 11 countries has been performed within the framework of the Forum for Nuclear Cooperation in Asia (FNCA) quality assurance program. The quality of radiation dosimetry varies because of the large variation in radiation therapy among the participating countries. One of the most important aspects of international multicentre clinical trials is uniformity of absolute dose between centres. The National Institute of Radiological Sciences (NIRS) in Japan has conducted a dose audit of participating countries since 2006 by using radiophotoluminescent glass dosimeters (RGDs)...
May 1, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/27864506/mitigation-of-whole-body-gamma-radiation-induced-damages-by-clerodendron-infortunatum-in-mammalian-organisms
#18
Tiju Chacko, Aditya Menon, Teeju Majeed, Sivaprabha V Nair, Nithu Sara John, Cherupally Krishnan Krishnan Nair
Several phytoceuticals and extracts of medicinal plants are reported to mitigate deleterious effects of ionizing radiation. The potential of hydro-alcoholic extract of Clerodendron infortunatum (CIE) for providing protection to mice exposed to gamma radiation was investigated. Oral administration of CIE bestowed a survival advantage to mice exposed to lethal doses of gamma radiation. Radiation-induced depletion of the total blood count and bone marrow cellularity were prevented by treatment with CIE. Damage to the cellular DNA (as was evident from the comet assay and the micronucleus index) was also found to be decreased upon CIE administration...
May 1, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/27837120/recommendations-for-high-risk-clinical-target-volume-definition-with-computed-tomography-for-three-dimensional-image-guided-brachytherapy-in-cervical-cancer-patients
#19
Tatsuya Ohno, Masaru Wakatsuki, Takafumi Toita, Yuko Kaneyasu, Ken Yoshida, Shingo Kato, Noriko Ii, Sunao Tokumaru, Hitoshi Ikushima, Takashi Uno, Shin-Ei Noda, Tomoko Kazumoto, Yoko Harima
Our purpose was to develop recommendations for contouring the computed tomography (CT)-based high-risk clinical target volume (CTVHR) for 3D image-guided brachytherapy (3D-IGBT) for cervical cancer. A 15-member Japanese Radiation Oncology Study Group (JROSG) committee with expertise in gynecological radiation oncology initiated guideline development for CT-based CTVHR (based on a comprehensive literature review as well as clinical experience) in July 2014. Extensive discussions occurred during four face-to-face meetings and frequent email communication until a consensus was reached...
May 1, 2017: Journal of Radiation Research
https://www.readbyqxmd.com/read/27811201/a-robust-measurement-point-for-dose-verification-in-delivery-quality-assurance-for-a-robotic-radiosurgery-system
#20
Keita Kurosu, Iori Sumida, Hiroya Shiomi, Hirokazu Mizuno, Hiroko Yamaguchi, Hirofumi Okubo, Keisuke Tamari, Yuji Seo, Osamu Suzuki, Seiichi Ota, Shinichi Inoue, Kazuhiko Ogawa
In this CyberKnife® dose verification study, we investigated the effectiveness of the novel potential error (PE) concept when applied to the determination of a robust measurement point for targeting errors. PE was calculated by dividing the differences between the maximum increases and decreases in dose distributions by the original distribution after obtaining the former by shifting the source-to-axis and off-axis distances of each beam by ±1.0 mm. Thus, PE values and measurement point dose heterogeneity were analyzed in 48 patients who underwent CyberKnife radiotherapy...
May 1, 2017: Journal of Radiation Research
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