1
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Imaoka T, Tanaka S, Tomita M, Doi K, Sasatani M, Suzuki K, Yamada Y, Kakinuma S, Kai M. Human-mouse comparison of the multistage nature of radiation carcinogenesis in a mathematical model. Int J Cancer 2024; 155:1101-1111. [PMID: 38688826 DOI: 10.1002/ijc.34987] [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: 11/09/2023] [Revised: 02/19/2024] [Accepted: 04/12/2024] [Indexed: 05/02/2024]
Abstract
Mouse models are vital for assessing risk from environmental carcinogens, including ionizing radiation, yet the interspecies difference in the dose response precludes direct application of experimental evidence to humans. Herein, we take a mathematical approach to delineate the mechanism underlying the human-mouse difference in radiation-related cancer risk. We used a multistage carcinogenesis model assuming a mutational action of radiation to analyze previous data on cancer mortality in the Japanese atomic bomb survivors and in lifespan mouse experiments. Theoretically, the model predicted that exposure will chronologically shift the age-related increase in cancer risk forward by a period corresponding to the time in which the spontaneous mutational process generates the same mutational burden as that the exposure generates. This model appropriately fitted both human and mouse data and suggested a linear dose response for the time shift. The effect per dose decreased with increasing age at exposure similarly between humans and mice on a per-lifespan basis (0.72- and 0.71-fold, respectively, for every tenth lifetime). The time shift per dose was larger by two orders of magnitude in humans (7.8 and 0.046 years per Gy for humans and mice, respectively, when exposed at ~35% of their lifetime). The difference was mostly explained by the two orders of magnitude difference in spontaneous somatic mutation rates between the species plus the species-independent radiation-induced mutation rate. Thus, the findings delineate the mechanism underlying the interspecies difference in radiation-associated cancer mortality and may lead to the use of experimental evidence for risk prediction in humans.
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Affiliation(s)
- Tatsuhiko Imaoka
- Department of Radiation Effects Research, Institute for Radiological Science, National Institutes for Quantum Science and Technology, Chiba, Japan
- Institute for Quantum Life Science, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Satoshi Tanaka
- Department of Radiobiology, Institute for Environmental Sciences, Rokkasho, Japan
| | - Masanori Tomita
- Sustainable System Research Laboratory, Central Research Institute of Electric Power Industry, Chiba, Japan
| | - Kazutaka Doi
- Department of Radiation Regulatory Science Research, Institute for Radiological Science, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Megumi Sasatani
- Department of Experimental Oncology, Research Institute for Radiation Biology and Medicine, Hiroshima, Japan
| | - Keiji Suzuki
- Department of Radiation Medical Sciences, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Yutaka Yamada
- Department of Radiation Effects Research, Institute for Radiological Science, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Shizuko Kakinuma
- Department of Radiation Effects Research, Institute for Radiological Science, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Michiaki Kai
- Department of Health Sciences, Nippon Bunri University, Oita, Japan
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2
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Suzuki K, Tsuruoka C, Morioka T, Seo H, Ogawa M, Kambe R, Imaoka T, Kakinuma S, Takahashi A. Combined effects of radiation and simulated microgravity on intestinal tumorigenesis in C3B6F1 Apc Min/+ mice. LIFE SCIENCES IN SPACE RESEARCH 2024; 41:202-209. [PMID: 38670648 DOI: 10.1016/j.lssr.2024.03.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 03/18/2024] [Accepted: 03/25/2024] [Indexed: 04/28/2024]
Abstract
Explorations of the Moon and Mars are planned as future manned space missions, during which humans will be exposed to both radiation and microgravity. We do not, however, know the health effects for such combined exposures. In a ground-based experiment, we evaluated the combined effects of radiation and simulated microgravity on tumorigenesis by performing X-irradiation and tail suspension in C3B6F1 ApcMin/+ mice, a well-established model for intestinal tumorigenesis. Mice were irradiated at 2 weeks of age and underwent tail suspension for 3 or 11 weeks using a special device that avoids damage to the tail. The tail suspension treatment significantly reduced the thymus weight after 3 weeks but not 11 weeks, suggesting a transient stress response. The combination of irradiation and tail suspension significantly increased the number of small intestinal tumors less than 2 mm in diameter as compared with either treatment alone. The combined treatment also increased the fraction of malignant tumors among all small intestinal tumors as compared with the radiation-only treatment. Thus, the C3B6F1 ApcMin/+ mouse is a useful model for assessing cancer risk in a simulated space environment, in which simulated microgravity accelerates tumor progression when combined with radiation exposure.
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Affiliation(s)
- Kenshi Suzuki
- Department of Radiation Effects Research, Institute for Radiological Science (NIRS), National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Chizuru Tsuruoka
- Department of Radiation Effects Research, Institute for Radiological Science (NIRS), National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Takamitsu Morioka
- Department of Radiation Effects Research, Institute for Radiological Science (NIRS), National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Hitomi Seo
- Department of Radiation Effects Research, Institute for Radiological Science (NIRS), National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Mari Ogawa
- Department of Radiation Effects Research, Institute for Radiological Science (NIRS), National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Ryosuke Kambe
- Gunma University Heavy Ion Medical Center, Gunma, Japan
| | - Tatsuhiko Imaoka
- Department of Radiation Effects Research, Institute for Radiological Science (NIRS), National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Shizuko Kakinuma
- Department of Radiation Effects Research, Institute for Radiological Science (NIRS), National Institutes for Quantum Science and Technology (QST), Chiba, Japan.
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3
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Shang Y, Morioka T, Daino K, Nakayama T, Nishimura M, Kakinuma S. Ionizing radiation promotes, whereas calorie restriction suppresses, NASH and hepatocellular carcinoma in mice. Int J Cancer 2023; 153:1529-1542. [PMID: 37458118 DOI: 10.1002/ijc.34651] [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: 01/28/2023] [Revised: 06/01/2023] [Accepted: 06/13/2023] [Indexed: 07/18/2023]
Abstract
The pathological conditions of nonalcoholic fatty liver disease and nonalcoholic steatohepatitis (NASH) are the major risk factors for hepatocellular carcinoma (HCC). Exposure to DNA-damaging agents such as ionizing radiation is another risk factor for HCC; calorie restriction (CR), however, effectively delays the onset of radiation-induced HCC. We investigated whether NASH is relevant to radiation-induced HCC and the cancer-preventing effect of CR. Eight-day-old male B6C3F1 mice were irradiated with 3.8 Gy of X-rays and then fed a standard diet or 30% CR diet from 49 days of age until necropsy, which was performed from 56 to 600 days with ~100-day intervals to assess both pathological changes and gene expression levels. We found that early-life exposure to radiation accelerated lipid accumulation and NASH-like histopathological changes in the liver, accompanied by accelerated development of HCC. CR ameliorated the changes in lipid metabolism in the liver and reversed the NASH-like pathology, which effectively delayed HCC development. Gene-expression profiling revealed the radiation-related activation and CR-related suppression of the peroxisome proliferator-activated receptor gamma/Cd36 pathway of transmembrane fatty-acid translocation before development of the NASH-like state. Thus, early-life exposure to radiation affects lipid metabolism and induces a steatoinflammatory microenvironment that favors HCC development. Therefore, targeting this pathway by CR (or measures that mimic CR) may be a promising strategy for preventing HCC caused by either radiation or other DNA-damaging agents.
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Affiliation(s)
- Yi Shang
- Department of Radiation Effects Research, National Institute of Radiological Sciences (NIRS), National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Takamitsu Morioka
- Department of Radiation Effects Research, National Institute of Radiological Sciences (NIRS), National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Kazuhiro Daino
- Department of Radiation Effects Research, National Institute of Radiological Sciences (NIRS), National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Takafumi Nakayama
- Department of Tumor and Diagnostic Pathology, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
| | - Mayumi Nishimura
- Department of Radiation Effects Research, National Institute of Radiological Sciences (NIRS), National Institutes for Quantum Science and Technology (QST), Chiba, Japan
| | - Shizuko Kakinuma
- Department of Radiation Effects Research, National Institute of Radiological Sciences (NIRS), National Institutes for Quantum Science and Technology (QST), Chiba, Japan
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4
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Semba R, Morioka T, Yanagihara H, Suzuki K, Tachibana H, Hamoya T, Horimoto Y, Imaoka T, Saito M, Kakinuma S, Arai M. Azithromycin induces read-through of the nonsense Apc allele and prevents intestinal tumorigenesis in C3B6F1 Apc Min/+ mice. Biomed Pharmacother 2023; 164:114968. [PMID: 37276642 DOI: 10.1016/j.biopha.2023.114968] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 05/23/2023] [Accepted: 05/29/2023] [Indexed: 06/07/2023] Open
Abstract
Therapeutic strategies that promote read-through of a mutant gene have proved effective for certain non-neoplastic diseases. However, the efficacy of this approach is unproven regarding neoplastic diseases with germline nonsense mutations, including familial adenomatous polyposis. Here we examined the cancer-preventive efficacy of the macrolide antibiotic azithromycin, with a reported read-through effect, on intestinal tumorigenesis in C3B6F1 ApcMin/+ mice harboring a nonsense Apc mutation resulting in a truncated Apc protein. Mice were given drinking water lacking azithromycin or containing 0.0125-0.2 mg/mL azithromycin from 3 weeks of age. The small intestine and cecum were analyzed for pathological changes and alterations of intestinal flora. Azithromycin suppressed the number of tumors and the proportion of adenocarcinomas, with the most effective drinking-water concentration being 0.0125 mg/mL. Furthermore, azithromycin recovered the cellular level of full-length Apc, resulting in downregulation of β-catenin and cyclin D1. Conversely, the effect of azithromycin on the diversity of the intestinal microbiota depended on the drinking-water concentration. These results suggest that the balance between azithromycin-mediate read-through of mutant Apc mRNA and antibacterial effects influences intestinal tumorigenesis. Thus, azithromycin is a potential anticancer agent for familial adenomatous polyposis patients harboring nonsense mutations.
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Affiliation(s)
- Ryoko Semba
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology (NIRS/QST), Japan; Department of Breast Oncology, Juntendo University School of Medicine, Japan
| | - Takamitsu Morioka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology (NIRS/QST), Japan
| | - Hiromi Yanagihara
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology (NIRS/QST), Japan
| | - Kenshi Suzuki
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology (NIRS/QST), Japan
| | - Hirotaka Tachibana
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology (NIRS/QST), Japan
| | - Takahiro Hamoya
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology (NIRS/QST), Japan
| | - Yoshiya Horimoto
- Department of Breast Oncology, Juntendo University School of Medicine, Japan
| | - Tatsuhiko Imaoka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology (NIRS/QST), Japan
| | - Mitsue Saito
- Department of Breast Oncology, Juntendo University School of Medicine, Japan
| | - Shizuko Kakinuma
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology (NIRS/QST), Japan.
| | - Masami Arai
- Department of Clinical Genetics, Juntendo University School of Medicine, Japan
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5
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Nakayama T, Sunaoshi M, Shang Y, Takahashi M, Saito T, Blyth BJ, Amasaki Y, Daino K, Shimada Y, Tachibana A, Kakinuma S. Calorie restriction alters the mechanisms of radiation-induced mouse thymic lymphomagenesis. PLoS One 2023; 18:e0280560. [PMID: 36662808 PMCID: PMC9858762 DOI: 10.1371/journal.pone.0280560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 12/29/2022] [Indexed: 01/21/2023] Open
Abstract
Calorie restriction (CR) suppresses not only spontaneous but also chemical- and radiation-induced carcinogenesis. Our previous study revealed that the cancer-preventive effect of CR is tissue dependent and that CR does not effectively prevent the development of thymic lymphoma (TL). We investigated the association between CR and the genomic alterations of resulting TLs to clarify the underlying resistance mechanism. TLs were obtained from previous and new experiments, in which B6C3F1 mice were exposed to radiation at 1 week of age and fed with a CR or standard (non-CR) diet from 7 weeks throughout their lifetimes. All available TLs were used for analysis of genomic DNA. In contrast to the TLs of the non-CR group, those of the CR group displayed suppression of copy-neutral loss of heterozygosity (LOH) involving relevant tumor suppressor genes (Cdkn2a, Ikzf1, Trp53, Pten), an event regarded as cell division-associated. However, CR did not affect interstitial deletions of those genes, which were observed in both groups. In addition, CR affected the mechanism of Ikzf1 inactivation in TLs: the non-CR group exhibited copy-neutral LOH with duplicated inactive alleles, whereas the CR group showed expression of dominant-negative isoforms accompanying a point mutation or an intragenic deletion. These results suggest that, even though CR reduces cell division-related genomic rearrangements by suppressing cell proliferation, tumors arise via diverse carcinogenic pathways including inactivation of tumor suppressors via interstitial deletions and other mutations. These findings provide a molecular basis for improved prevention strategies that overcome the CR resistance of lymphomagenesis.
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Affiliation(s)
- Takafumi Nakayama
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba, Japan
- Department of Tumor and Diagnostic Pathology, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan
- Graduate School of Science and Engineering, Ibaraki University, Mito, Japan
| | - Masaaki Sunaoshi
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Yi Shang
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Mizuki Takahashi
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba, Japan
- Graduate School of Science and Engineering, Ibaraki University, Mito, Japan
| | - Takato Saito
- Graduate School of Science and Engineering, Ibaraki University, Mito, Japan
| | - Benjamin J. Blyth
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Yoshiko Amasaki
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Kazuhiro Daino
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Yoshiya Shimada
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Akira Tachibana
- Graduate School of Science and Engineering, Ibaraki University, Mito, Japan
| | - Shizuko Kakinuma
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba, Japan
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6
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Imaoka T, Nishimura M, Daino K, Hosoki A, Kudo KI, Iizuka D, Nagata K, Takabatake M, Nishimura Y, Kokubo T, Morioka T, Doi K, Shimada Y, Kakinuma S. DOSE-RATE EFFECT OF RADIATION ON RAT MAMMARY CARCINOGENESIS AND AN EMERGING ROLE FOR STEM CELL BIOLOGY. RADIATION PROTECTION DOSIMETRY 2022; 198:1036-1046. [PMID: 36083756 DOI: 10.1093/rpd/ncac050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 03/03/2022] [Accepted: 03/20/2021] [Indexed: 06/15/2023]
Abstract
The uncertain cancer risk of protracted radiation exposure at low dose rates is an important issue in radiological protection. Tissue stem/progenitor cells are a supposed origin of cancer and may contribute to the dose-rate effect on carcinogenesis. The authors have shown that female rats subjected to continuous whole body γ irradiation as juveniles or young adults have a notably reduced incidence of mammary cancer as compared with those irradiated acutely. Experiments using the mammosphere formation assay suggested the presence of radioresistant progenitor cells. Cell sorting indicated that basal progenitor cells in rat mammary gland were more resistant than luminal progenitors to killing by acute radiation, especially at high doses. Thus, the evidence indicates a cell-type-dependent inactivation of mammary cells that manifests only at high acute doses, implying a link to the observed dose-rate effect on carcinogenesis.
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Affiliation(s)
- Tatsuhiko Imaoka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Mayumi Nishimura
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Kazuhiro Daino
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Ayaka Hosoki
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Ken-Ichi Kudo
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
- Department of Radiation Life Sciences, School of Medicine, Fukushima Medical University, Fukushima 960-1247, Japan
| | - Daisuke Iizuka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Kento Nagata
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Masaru Takabatake
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
- Department of Radiological Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University, Tokyo 116-8551, Japan
| | - Yukiko Nishimura
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Toshiaki Kokubo
- Laboratory Animal and Genome Sciences Section, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Takamitsu Morioka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Kazutaka Doi
- Department of Radiation Regulatory Science Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
| | - Yoshiya Shimada
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
- Institute for Environmental Sciences, Aomori 039-3212, Japan
| | - Shizuko Kakinuma
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
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7
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Nakajima T, Ninomiya Y, Unno K, Morioka T, Nishimura M, Kakinuma S. Impacts of psychological stress on high dose-rate radiation acute effects in a mouse experimental model. JOURNAL OF RADIATION RESEARCH 2022; 63:602-608. [PMID: 35726341 PMCID: PMC9303612 DOI: 10.1093/jrr/rrac028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/23/2022] [Indexed: 06/15/2023]
Abstract
Psychological stress affects health. Radiation workers in the medical field or astronauts living in space have possible risks of exposure to radiation, and psychological stress is considered to be easily induced in them due to activities performed in small areas or stress conditions. The impact of psychological stress on the effects of radiation was evaluated in senescence-accelerated mouse prone 10 (SAMP10) mice and ddY mice using a confrontational housing model, which makes dominant and subordinate mice in a cage live together without severe quarrel. Mice of ddY and SAMP10 have been previously demonstrated to be influenced in terms of acute and late effects, respectively, under psychological stress by this model. In SAMP10 mice, irradiation with 4 Gy induced the death of irradiated mice under psychological stress. In ddY mice, irradiation with 5 Gy X-rays alone had almost no effect on the mouse survival, but irradiation in conditions of psychological stress promoted acute death of irradiated mice. In addition, hypocellular bone marrow was also observed histopathologically in irradiated ddY mice under stress. Psychological stress may promote damage caused by radiation through modulation of radio-sensitivity in bone marrow in mice. This model would be useful for evaluation of modulation of radiation-induced various effects by psychological stress.
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Affiliation(s)
- Tetsuo Nakajima
- Corresponding author. Department of Radiation Effects Research, National Institute of Radiological Sciences, QST, Chibashi, 263-8555 Japan. Tel/Fax +81-43-206-3086/+81-43-255-6497 E-mail:
| | - Yasuharu Ninomiya
- Department of Radiation Effects Research, National Institute of Radiological Sciences, QST, Chiba-shi, 263-8555 Japan
| | - Keiko Unno
- Tea Science Center, University of Shizuoka, Shizuoka 422-8526, Japan
| | - Takamitsu Morioka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, QST, Chiba-shi, 263-8555 Japan
| | - Mayumi Nishimura
- Department of Radiation Effects Research, National Institute of Radiological Sciences, QST, Chiba-shi, 263-8555 Japan
| | - Shizuko Kakinuma
- Department of Radiation Effects Research, National Institute of Radiological Sciences, QST, Chiba-shi, 263-8555 Japan
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8
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Nakamura Y, Kubota J, Nishimura Y, Nagata K, Nishimura M, Daino K, Ishikawa A, Kaneko T, Mashimo T, Kokubo T, Takabatake M, Inoue K, Fukushi M, Arai M, Saito M, Shimada Y, Kakinuma S, Imaoka T.
Brca1
L63X
/+
rat is a novel model of human
BRCA1
deficiency displaying susceptibility to radiation‐induced mammary cancer. Cancer Sci 2022; 113:3362-3375. [PMID: 35851737 PMCID: PMC9530872 DOI: 10.1111/cas.15485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 06/14/2022] [Accepted: 07/03/2022] [Indexed: 11/30/2022] Open
Abstract
Women who are heterozygous for deleterious BRCA1 germline mutations harbor a high risk of hereditary breast cancer. Previous Brca1‐heterozygous animal models do not recapitulate the breast cancer phenotype, and thus all currently used knockout models adopt conditional, mammary‐specific homozygous Brca1 loss or addition of Trp53 deficiency. Herein, we report the creation and characterization of a novel Brca1 mutant rat model harboring the germline L63X mutation, which mimics a founder mutation in Japan, through CRISPR‐Cas9–based genome editing. Homozygotes (Brca1L63X/L63X) were embryonic lethal, whereas heterozygotes (Brca1L63X/+) showed apparently normal development. Without carcinogen exposure, heterozygotes developed mammary carcinoma at a comparable incidence rate with their wild‐type (WT) littermates during their lifetime. Intraperitoneal injection of 1‐methyl‐1‐nitrosourea (25 or 50 mg/kg) at 7 weeks of age induced mammary carcinogenesis at comparable levels among the heterozygotes and their littermates. After exposure to ionizing radiation (0.1–2 Gy) at 7 weeks of age, the heterozygotes, but not WT littermates, displayed dose‐dependent mammary carcinogenesis with 0.8 Gy−1 excess in hazard ratio during their middle age; the relative susceptibility of the heterozygotes was more prominent when rats were irradiated at 3 weeks of age. The heterozygotes had tumors with a lower estrogen receptor α immunopositivity and no evidence of somatic mutations of the WT allele. The Brca1L63X/+ rats thus offer the first single‐mutation, heterozygous model of BRCA1‐associated breast cancer, especially with exposure to a DNA break‐inducing carcinogen. This implies that such carcinogens are causative and a key to breast cancer prevention in individuals who carry high‐risk BRCA1 mutations.
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Affiliation(s)
- Yuzuki Nakamura
- Department of Radiation Effects Research National Institute of Radiological Sciences Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, Chiba 263‐8555 Japan
- Department of Radiological Sciences, Graduate School of Human Health Sciences Tokyo Metropolitan University 116‐8551 Tokyo Japan
| | - Jo Kubota
- Department of Radiation Effects Research National Institute of Radiological Sciences Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, Chiba 263‐8555 Japan
- Department of Radiological Sciences, Graduate School of Human Health Sciences Tokyo Metropolitan University 116‐8551 Tokyo Japan
| | - Yukiko Nishimura
- Department of Radiation Effects Research National Institute of Radiological Sciences Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, Chiba 263‐8555 Japan
| | - Kento Nagata
- Department of Radiation Effects Research National Institute of Radiological Sciences Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, Chiba 263‐8555 Japan
| | - Mayumi Nishimura
- Department of Radiation Effects Research National Institute of Radiological Sciences Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, Chiba 263‐8555 Japan
| | - Kazuhiro Daino
- Department of Radiation Effects Research National Institute of Radiological Sciences Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, Chiba 263‐8555 Japan
| | - Atsuko Ishikawa
- Department of Radiation Effects Research National Institute of Radiological Sciences Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, Chiba 263‐8555 Japan
| | - Takehito Kaneko
- Division of Fundamental and Applied Sciences, Graduate School of Science and Engineering Iwate University Morioka Japan
- Institute of Laboratory Animals, Graduate School of Medicine Kyoto University 606‐8303 Kyoto Japan
| | - Tomoji Mashimo
- Institute of Laboratory Animals, Graduate School of Medicine Kyoto University 606‐8303 Kyoto Japan
- Laboratory Animal Research Center, Institute of Medical Science The University of Tokyo 108‐8639 Tokyo Japan
| | - Toshiaki Kokubo
- Laboratory Animal and Genome Sciences Section, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology 263‐8555 Chiba Japan
| | - Masaru Takabatake
- Department of Radiation Effects Research National Institute of Radiological Sciences Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, Chiba 263‐8555 Japan
- Department of Radiological Sciences, Graduate School of Human Health Sciences Tokyo Metropolitan University 116‐8551 Tokyo Japan
| | - Kazumasa Inoue
- Department of Radiological Sciences, Graduate School of Human Health Sciences Tokyo Metropolitan University 116‐8551 Tokyo Japan
| | - Masahiro Fukushi
- Department of Radiological Sciences, Graduate School of Human Health Sciences Tokyo Metropolitan University 116‐8551 Tokyo Japan
| | - Masami Arai
- Department of Clinical Genetics, Graduate School of Medicine Juntendo University 113‐8421 Tokyo Japan
| | - Mitsue Saito
- Department of Breast Oncology, Graduate School of Medicine Juntendo University 113‐8421 Tokyo Japan
| | - Yoshiya Shimada
- Department of Radiation Effects Research National Institute of Radiological Sciences Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, Chiba 263‐8555 Japan
- Department of Radiological Sciences, Graduate School of Human Health Sciences Tokyo Metropolitan University 116‐8551 Tokyo Japan
| | - Shizuko Kakinuma
- Department of Radiation Effects Research National Institute of Radiological Sciences Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, Chiba 263‐8555 Japan
- Department of Radiological Sciences, Graduate School of Human Health Sciences Tokyo Metropolitan University 116‐8551 Tokyo Japan
| | - Tatsuhiko Imaoka
- Department of Radiation Effects Research National Institute of Radiological Sciences Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, Chiba 263‐8555 Japan
- Department of Radiological Sciences, Graduate School of Human Health Sciences Tokyo Metropolitan University 116‐8551 Tokyo Japan
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Sunaoshi M, Blyth BJ, Shang Y, Tsuruoka C, Morioka T, Shinagawa M, Ogawa M, Shimada Y, Tachibana A, Iizuka D, Kakinuma S. Post-Irradiation Thymic Regeneration in B6C3F1 Mice Is Age Dependent and Modulated by Activation of the PI3K-AKT-mTOR Pathway. BIOLOGY 2022; 11:biology11030449. [PMID: 35336821 PMCID: PMC8945464 DOI: 10.3390/biology11030449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 03/14/2022] [Accepted: 03/15/2022] [Indexed: 11/23/2022]
Abstract
Simple Summary Because children have a long life expectancy relative to adults and their tissues and organs are growing and developing rapidly, the risk of radiation carcinogenesis for children is considered higher than that for adults. However, the underlying mechanism(s) is unclear. To uncover the mechanism, we previously revealed that principal causative genes in mouse thymic lymphomas arising in irradiated infants or adults as Pten or Ikzf1, respectively, suggesting that cells with mutation in these genes might be the origin of lymphomas arising after irradiation depending on age at exposure. Here, we clarified the age-dependent differences in thymus-cell dynamics in mice during the initial post-irradiation period. Our results demonstrate that the dynamics of thymocytes during the post-irradiation period depends on the age at exposure. For irradiated infants in particular, the number of proliferating cells increase dramatically, and this correlate with activation of the PI3K-AKT-mTOR pathway. Thus, we conclude that the PI3K-AKT-mTOR pathway in infants contributed, at least in part, to thymus-cell dynamics through the modification of cell proliferation and survival after irradiation, which may be associated with the risk of Pten mutation-associated thymic lymphoma. Abstract The risk of radiation-induced carcinogenesis depends on age at exposure. We previously reported principal causative genes in lymphomas arising after infant or adult exposure to 4-fractionated irradiation as Pten or Ikzf1, respectively, suggesting that cells with mutation in these genes might be the origin of lymphomas arising after irradiation depending on age at exposure. Here, we clarified the age-dependent differences in thymus-cell dynamics in mice during the initial post-irradiation period. The thymocyte number initially decreased, followed by two regeneration phases. During the first regeneration, the proportion of phosphorylated-AKT-positive (p-AKT+) cells in cell-cycle phases S+G2/M of immature CD4−CD8− and CD4+CD8+ thymocytes and in phases G0/G1 of mature CD4+CD8− and CD4−CD8+ thymocytes was significantly greater in irradiated infants than in irradiated adults. During the second regeneration, the proportion of p-AKT+ thymocytes in phases G0/G1 increased in each of the three populations other than CD4−CD8− thymocytes more so than during the first regeneration. Finally, PI3K-AKT-mTOR signaling in infants contributed, at least in part, to biphasic thymic regeneration through the modification of cell proliferation and survival after irradiation, which may be associated with the risk of Pten mutation-associated thymic lymphoma.
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Affiliation(s)
- Masaaki Sunaoshi
- Department of Radiation Effects Research, National Institute of Radiological Sciences, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Chiba 263-8555, Japan; (M.S.); (B.J.B.); (Y.S.); (C.T.); (T.M.); (M.S.); (M.O.); (Y.S.); (S.K.)
| | - Benjamin J. Blyth
- Department of Radiation Effects Research, National Institute of Radiological Sciences, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Chiba 263-8555, Japan; (M.S.); (B.J.B.); (Y.S.); (C.T.); (T.M.); (M.S.); (M.O.); (Y.S.); (S.K.)
| | - Yi Shang
- Department of Radiation Effects Research, National Institute of Radiological Sciences, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Chiba 263-8555, Japan; (M.S.); (B.J.B.); (Y.S.); (C.T.); (T.M.); (M.S.); (M.O.); (Y.S.); (S.K.)
| | - Chizuru Tsuruoka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Chiba 263-8555, Japan; (M.S.); (B.J.B.); (Y.S.); (C.T.); (T.M.); (M.S.); (M.O.); (Y.S.); (S.K.)
| | - Takamitsu Morioka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Chiba 263-8555, Japan; (M.S.); (B.J.B.); (Y.S.); (C.T.); (T.M.); (M.S.); (M.O.); (Y.S.); (S.K.)
| | - Mayumi Shinagawa
- Department of Radiation Effects Research, National Institute of Radiological Sciences, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Chiba 263-8555, Japan; (M.S.); (B.J.B.); (Y.S.); (C.T.); (T.M.); (M.S.); (M.O.); (Y.S.); (S.K.)
| | - Mari Ogawa
- Department of Radiation Effects Research, National Institute of Radiological Sciences, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Chiba 263-8555, Japan; (M.S.); (B.J.B.); (Y.S.); (C.T.); (T.M.); (M.S.); (M.O.); (Y.S.); (S.K.)
| | - Yoshiya Shimada
- Department of Radiation Effects Research, National Institute of Radiological Sciences, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Chiba 263-8555, Japan; (M.S.); (B.J.B.); (Y.S.); (C.T.); (T.M.); (M.S.); (M.O.); (Y.S.); (S.K.)
| | - Akira Tachibana
- Graduate School of Science and Engineering, Ibaraki University, 2-1-1 Bunkyo, Mito 310-8512, Japan;
| | - Daisuke Iizuka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Chiba 263-8555, Japan; (M.S.); (B.J.B.); (Y.S.); (C.T.); (T.M.); (M.S.); (M.O.); (Y.S.); (S.K.)
- Correspondence: ; Tel.: +81-43-206-3160
| | - Shizuko Kakinuma
- Department of Radiation Effects Research, National Institute of Radiological Sciences, Quantum Life and Medical Science Directorate, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Chiba 263-8555, Japan; (M.S.); (B.J.B.); (Y.S.); (C.T.); (T.M.); (M.S.); (M.O.); (Y.S.); (S.K.)
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Girard WP, Bertrand-Grenier A, Drolet MJ. Animal Experimentation in Oncology and Radiobiology: Arguments for and Against Following a Critical Literature Review. CANADIAN JOURNAL OF BIOETHICS 2022. [DOI: 10.7202/1089790ar] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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11
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Sakama S, Kurusu K, Morita M, Oizumi T, Masugata S, Oka S, Yokomizo S, Nishimura M, Morioka T, Kakinuma S, Shimada Y, Nakamura AJ. An Enriched Environment Alters DNA Repair and Inflammatory Responses After Radiation Exposure. Front Immunol 2021; 12:760322. [PMID: 34745135 PMCID: PMC8570081 DOI: 10.3389/fimmu.2021.760322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 10/08/2021] [Indexed: 11/22/2022] Open
Abstract
After the Fukushima Daiichi Nuclear Power Plant accident, there is growing concern about radiation-induced carcinogenesis. In addition, living in a long-term shelter or temporary housing due to disasters might cause unpleasant stress, which adversely affects physical and mental health. It's been experimentally demonstrated that "eustress", which is rich and comfortable, has beneficial effects for health using mouse models. In a previous study, mice raised in the enriched environment (EE) has shown effects such as suppression of tumor growth and enhancement of drug sensitivity during cancer treatment. However, it's not yet been evaluated whether EE affects radiation-induced carcinogenesis. Therefore, to evaluate whether EE suppresses a radiation-induced carcinogenesis after radiation exposure, in this study, we assessed the serum leptin levels, radiation-induced DNA damage response and inflammatory response using the mouse model. In brief, serum and tissues were collected and analyzed over time in irradiated mice after manipulating the raising environment during the juvenile or adult stage. To assess the radiation-induced DNA damage response, we performed immunostaining for phosphorylated H2AX which is a marker of DNA double-strand break. Focusing on the polarization of macrophages in the inflammatory reaction that has an important role in carcinogenesis, we performed analysis using tissue immunofluorescence staining and RT-qPCR. Our data confirmed that EE breeding before radiation exposure improved the responsiveness to radiation-induced DNA damage and basal immunity, further suppressing the chronic inflammatory response, and that might lead to a reduction of the risk of radiation-induced carcinogenesis.
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Affiliation(s)
- Sae Sakama
- Department of Biological Science, College of Sciences, Ibaraki University, Mito, Japan
| | - Keisuke Kurusu
- Department of Biological Science, College of Sciences, Ibaraki University, Mito, Japan
| | - Mayu Morita
- Department of Biological Science, College of Sciences, Ibaraki University, Mito, Japan
| | - Takashi Oizumi
- Department of Biological Science, College of Sciences, Ibaraki University, Mito, Japan
| | - Shinya Masugata
- Department of Biological Science, College of Sciences, Ibaraki University, Mito, Japan
| | - Shohei Oka
- Department of Biological Science, College of Sciences, Ibaraki University, Mito, Japan
| | - Shinya Yokomizo
- Department of Radiation Effects Research, National Institute of Radiological Sciences (NIRS), National Institutes for Quantum and Radiological Science and Technology (QST), Chiba, Japan
| | - Mayumi Nishimura
- Department of Radiation Effects Research, National Institute of Radiological Sciences (NIRS), National Institutes for Quantum and Radiological Science and Technology (QST), Chiba, Japan
| | - Takamitsu Morioka
- Department of Radiation Effects Research, National Institute of Radiological Sciences (NIRS), National Institutes for Quantum and Radiological Science and Technology (QST), Chiba, Japan
| | - Shizuko Kakinuma
- Department of Radiation Effects Research, National Institute of Radiological Sciences (NIRS), National Institutes for Quantum and Radiological Science and Technology (QST), Chiba, Japan
| | - Yoshiya Shimada
- Executive Director, National Institutes for Quantum and Radiological Science and Technology (QST), Chiba, Japan
| | - Asako J. Nakamura
- Department of Biological Science, College of Sciences, Ibaraki University, Mito, Japan
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12
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Nishimura M, Daino K, Fukuda M, Tanaka I, Moriyama H, Showler K, Nishimura Y, Takabatake M, Kokubo T, Ishikawa A, Inoue K, Fukushi M, Kakinuma S, Imaoka T, Shimada Y. Development of mammary cancer in γ-irradiated F1 hybrids of susceptible Sprague-Dawley and resistant Copenhagen rats, with copy-number losses that pinpoint potential tumor suppressors. PLoS One 2021; 16:e0255968. [PMID: 34388197 PMCID: PMC8362979 DOI: 10.1371/journal.pone.0255968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 07/28/2021] [Indexed: 01/03/2023] Open
Abstract
Copenhagen rats are highly resistant to mammary carcinogenesis, even after treatment with chemical carcinogens and hormones; most studies indicate that this is a dominant genetic trait. To test whether this trait is also dominant after radiation exposure, we characterized the susceptibility of irradiated Copenhagen rats to mammary carcinogenesis, as well as its inheritance, and identified tumor-suppressor genes that, when inactivated or mutated, may contribute to carcinogenesis. To this end, mammary cancer-susceptible Sprague-Dawley rats, resistant Copenhagen rats, and their F1 hybrids were irradiated with 4 Gy of γ-rays, and tumor development was monitored. Copy-number variations and allelic imbalances of genomic DNA were studied using microarrays and PCR analysis of polymorphic markers. Gene expression was assessed by quantitative PCR in normal tissues and induced mammary cancers of F1 rats. Irradiated Copenhagen rats exhibited a very low incidence of mammary cancer. Unexpectedly, this resistance trait did not show dominant inheritance in F1 rats; rather, they exhibited intermediate susceptibility levels (i.e., between those of their parent strains). The susceptibility of irradiated F1 rats to the development of benign mammary tumors (i.e., fibroadenoma and adenoma) was also intermediate. Copy-number losses were frequently observed in chromosome regions 1q52-54 (24%), 2q12-15 (33%), and 3q31-42 (24%), as were focal (38%) and whole (29%) losses of chromosome 5. Some of these chromosomal regions exhibited allelic imbalances. Many cancer-related genes within these regions were downregulated in mammary tumors as compared with normal mammary tissue. Some of the chromosomal losses identified have not been reported previously in chemically induced models, implying a novel mechanism inherent to the irradiated model. Based on these findings, Sprague-Dawley × Copenhagen F1 rats offer a useful model for exploring genes responsible for radiation-induced mammary cancer, which apparently are mainly located in specific regions of chromosomes 1, 2, 3 and 5.
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Affiliation(s)
- Mayumi Nishimura
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Kazuhiro Daino
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Maki Fukuda
- Department of Radiological Sciences, Tokyo Metropolitan University, Tokyo, Japan
- Radiobiology for Children’s Health Research Group, Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba, Japan
| | - Ikuya Tanaka
- Department of Radiological Sciences, Tokyo Metropolitan University, Tokyo, Japan
- Radiobiology for Children’s Health Research Group, Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba, Japan
| | - Hitomi Moriyama
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
- Department of Radiological Sciences, Tokyo Metropolitan University, Tokyo, Japan
| | - Kaye Showler
- Department of Radiological Sciences, Tokyo Metropolitan University, Tokyo, Japan
- Radiobiology for Children’s Health Research Group, Research Center for Radiation Protection, National Institute of Radiological Sciences, Chiba, Japan
| | - Yukiko Nishimura
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Masaru Takabatake
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
- Department of Radiological Sciences, Tokyo Metropolitan University, Tokyo, Japan
| | - Toshiaki Kokubo
- Laboratory Animal and Genome Sciences Section, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Atsuko Ishikawa
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Kazumasa Inoue
- Department of Radiological Sciences, Tokyo Metropolitan University, Tokyo, Japan
| | - Masahiro Fukushi
- Department of Radiological Sciences, Tokyo Metropolitan University, Tokyo, Japan
| | - Shizuko Kakinuma
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
- Department of Radiological Sciences, Tokyo Metropolitan University, Tokyo, Japan
| | - Tatsuhiko Imaoka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
- Department of Radiological Sciences, Tokyo Metropolitan University, Tokyo, Japan
- * E-mail: (TI); (YS)
| | - Yoshiya Shimada
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
- Department of Radiological Sciences, Tokyo Metropolitan University, Tokyo, Japan
- * E-mail: (TI); (YS)
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13
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Tsuruoka C, Kaminishi M, Shinagawa M, Shang Y, Amasaki Y, Shimada Y, Kakinuma S. High Relative Biological Effectiveness of 2 MeV Fast Neutrons for Induction of Medulloblastoma in Ptch1+/- Mice with Radiation-specific Deletion on Chromosome 13. Radiat Res 2021; 196:225-234. [PMID: 34046685 DOI: 10.1667/rade-20-00025.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 05/06/2021] [Indexed: 11/03/2022]
Abstract
Neutron radiation, a high-linear energy transfer radiation, has a high relative biological effectiveness (RBE) for various end points. The age at exposure is an important modifier of the effects of radiation, including carcinogenesis, with infants being generally more radiosensitive. Ptch1+/- mice offer a unique experimental system for assessing radiation carcinogenesis. Spontaneous development of medulloblastoma tumors occurs in nonirradiated animals that lose their Ptch1+ allele, most frequently by a loss of heterozygosity (LOH) of chromosome 13 via recombination or non-disjunction (referred to as S-type tumors). In contrast, tumors occur in irradiated Ptch1+/- mice as a result of chromosome 13 LOH with an interstitial deletion (R-type), making spontaneous and radiation-induced tumors discernible. To elucidate the influence of age on the effect of fast neutrons, we irradiated Ptch1+/- mice with neutrons (mean energy, ∼2 MeV) or γ rays on embryonic day (E)14 and E17 and on postnatal day (P)1, 4 or 10 and classified the resulting medulloblastomas based on chromosome 13 aberrations. Instead of LOH, some tumors harbored mutations in their Ptch1+ gene via a nonirradiation-associated mechanism such as duplication, insertion, base substitution or deletion with microhomology-mediated end joining; thus, these tumors were classified as S-type. The RBE regarding the induction of R-type tumors was 12.9 (8.6, 17.2), 9.6 (6.9, 12.3), 21.5 (17.2, 25.8), and 7.1 (4.7, 9.5) (mean and 95% confidence interval) for mice irradiated on E14, E17, P1 and P4, respectively, with the highest value seen during the most active development of the tissue and P10 being completely resistant. These results indicate that the developmental stage at exposure of the tissue influences the RBE of neutrons.
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Affiliation(s)
- Chizuru Tsuruoka
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Mutsumi Kaminishi
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Mayumi Shinagawa
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Yi Shang
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Yoshiko Amasaki
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Yoshiya Shimada
- Institute for Environmental Science, Kamikita-gun, Aomori, Japan
| | - Shizuko Kakinuma
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
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14
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Karapiperis C, Chasapi A, Angelis L, Scouras ZG, Mastroberardino PG, Tapio S, Atkinson MJ, Ouzounis CA. The Coming of Age for Big Data in Systems Radiobiology, an Engineering Perspective. BIG DATA 2021; 9:63-71. [PMID: 32991205 DOI: 10.1089/big.2019.0144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
As high-throughput approaches in biological and biomedical research are transforming the life sciences into information-driven disciplines, modern analytics platforms for big data have started to address the needs for efficient and systematic data analysis and interpretation. We observe that radiobiology is following this general trend, with -omics information providing unparalleled depth into the biomolecular mechanisms of radiation response-defined as systems radiobiology. We outline the design of computational frameworks and discuss the analysis of big data in low-dose ionizing radiation (LDIR) responses of the mammalian brain. Following successful examples and best practices of approaches for the analysis of big data in life sciences and health care, we present the needs and requirements for radiation research. Our goal is to raise awareness for the radiobiology community about the new technological possibilities that can capture complex information and execute data analytics on a large scale. The production of large data sets from genome-wide experiments (quantity) and the complexity of radiation research with multidimensional experimental designs (quality) will necessitate the adoption of latest information technologies. The main objective was to translate research results into applied clinical and epidemiological practice and understand the responses of biological tissues to LDIR to define new radiation protection policies. We envisage a future where multidisciplinary teams include data scientists, artificial intelligence experts, DevOps engineers, and of course radiation experts to fulfill the augmented needs of the radiobiology community, accelerate research, and devise new strategies.
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Affiliation(s)
- Christos Karapiperis
- School of Informatics, Aristotle University of Thessalonica (AUTH), Thessalonica, Greece
| | - Anastasia Chasapi
- Biological Computation & Process Laboratory (BCPL), Chemical Process & Energy Resources Institute (CPERI), Centre for Research & Technology Hellas (CERTH), Thessalonica, Greece
| | - Lefteris Angelis
- School of Informatics, Aristotle University of Thessalonica (AUTH), Thessalonica, Greece
| | - Zacharias G Scouras
- School of Biology, Aristotle University of Thessalonica (AUTH), Thessalonica, Greece
| | | | - Soile Tapio
- Institute of Radiation Biology, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health (HMGU), Neuherberg, Germany
| | - Michael J Atkinson
- Institute of Radiation Biology, Helmholtz Zentrum Muenchen, German Research Center for Environmental Health (HMGU), Neuherberg, Germany
| | - Christos A Ouzounis
- School of Informatics, Aristotle University of Thessalonica (AUTH), Thessalonica, Greece
- Biological Computation & Process Laboratory (BCPL), Chemical Process & Energy Resources Institute (CPERI), Centre for Research & Technology Hellas (CERTH), Thessalonica, Greece
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15
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Inoue T, Kokubo T, Daino K, Yanagihara H, Watanabe F, Tsuruoka C, Amasaki Y, Morioka T, Homma‐Takeda S, Kobayashi T, Hino O, Shimada Y, Kakinuma S. Interstitial chromosomal deletion of the tuberous sclerosis complex 2 locus is a signature for radiation-associated renal tumors in Eker rats. Cancer Sci 2020; 111:840-848. [PMID: 31925975 PMCID: PMC7060461 DOI: 10.1111/cas.14307] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 12/23/2019] [Accepted: 12/31/2019] [Indexed: 01/01/2023] Open
Abstract
Ionizing radiation can damage DNA and, therefore, is a risk factor for cancer. Eker rats, which carry a heterozygous germline mutation in the tumor-suppressor gene tuberous sclerosis complex 2 (Tsc2), are susceptible to radiation-induced renal carcinogenesis. However, the molecular mechanisms involved in Tsc2 inactivation are unclear. We subjected Fischer 344 × Eker (Long Evans Tsc2+/- ) F1 hybrid rats to gamma-irradiation (2 Gy) at gestational day 19 (GD19) or postnatal day 5 (PND5) and investigated the patterns of genomic alterations in the Tsc2 allele of renal tumors that developed at 1 year after irradiation (N = 24 tumors for GD19, N = 10 for PND5), in comparison with spontaneously developed tumors (N = 8 tumors). Gamma-irradiation significantly increased the multiplicity of renal tumors. The frequency of LOH at the chromosome 10q12 region, including the Tsc2 locus, was 38%, 29% and 60% in renal carcinomas developed from the nonirradiated, GD19 and PND5 groups, respectively. Array comparative genomic hybridization analysis revealed that the LOH patterns on chromosome 10 in renal carcinomas were classified into chromosomal missegregation, mitotic recombination and chromosomal deletion types. LOH of the interstitial chromosomal deletion type was observed only in radiation-associated carcinomas. Sequence analysis for the wild-type Tsc2 allele in the LOH-negative carcinomas identified deletions (nonirradiated: 26%; GD19: 21%) and base-substitution mutations (GD19: 4%). Reduced expression of Tsc2 was also observed in the majority of the LOH-negative carcinomas. Our results suggest that interstitial chromosomal deletion is a characteristic mutagenic event caused by ionizing radiation, and it may contribute to the assessment of radiation-induced cancer risk.
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Affiliation(s)
- Tatsuya Inoue
- Department of Radiation Effects ResearchNational Institute of Radiological SciencesNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
- Department of RadiologyJuntendo University Urayasu HospitalChibaJapan
| | - Toshiaki Kokubo
- Laboratory Animal and Genome Sciences SectionNational Institute of Radiological SciencesNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Kazuhiro Daino
- Department of Radiation Effects ResearchNational Institute of Radiological SciencesNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Hiromi Yanagihara
- Department of Radiation Effects ResearchNational Institute of Radiological SciencesNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Fumiko Watanabe
- Department of Radiation Effects ResearchNational Institute of Radiological SciencesNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Chizuru Tsuruoka
- Department of Radiation Effects ResearchNational Institute of Radiological SciencesNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Yoshiko Amasaki
- Department of Radiation Effects ResearchNational Institute of Radiological SciencesNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Takamitsu Morioka
- Department of Radiation Effects ResearchNational Institute of Radiological SciencesNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Shino Homma‐Takeda
- Department of Basic Medical Sciences for Radiation DamagesNational Institute of Radiological SciencesNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
| | - Toshiyuki Kobayashi
- Department of Pathology and OncologyFaculty of MedicineJuntendo UniversityTokyoJapan
| | - Okio Hino
- Department of Pathology and OncologyFaculty of MedicineJuntendo UniversityTokyoJapan
| | - Yoshiya Shimada
- National Institutes for Quantum and Radiological Science and TechnologyChibaJapan
- Present address:
Institute for Environmental SciencesAomoriJapan
| | - Shizuko Kakinuma
- Department of Radiation Effects ResearchNational Institute of Radiological SciencesNational Institutes for Quantum and Radiological Science and TechnologyChibaJapan
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16
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OKAWA A, MORIOKA T, IMAOKA T, KAKINUMA S, MATSUMOTO Y. Differential expression of DNA-dependent protein kinase catalytic subunit in the brain of neonatal mice and young adult mice. PROCEEDINGS OF THE JAPAN ACADEMY. SERIES B, PHYSICAL AND BIOLOGICAL SCIENCES 2020; 96:171-179. [PMID: 32389917 PMCID: PMC7248211 DOI: 10.2183/pjab.96.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 03/10/2020] [Indexed: 06/11/2023]
Abstract
It is generally thought that younger people are more susceptible to cancer development after exposure to ionizing radiation in reference to epidemiological studies and animal experiments. However, little is known about the age-dependent alteration in DNA repair ability. In the present study, we examined the expression levels of proteins involved in the repair of DNA double-strand breaks through non-homologous end joining (NHEJ), i.e., DNA-dependent protein kinase catalytic subunit (DNA-PKcs), X-ray repair cross-complementing 4 (XRCC4) and XRCC4-like factor (XLF). We found that the expression of DNA-PKcs in brain tissues was higher in neonatal mice (1 week after birth) than in young adult mice (7 weeks after birth). In association with this, DNA double-strand breaks were repaired more rapidly in the brain tissues of neonatal mice than in those of young adult mice. The current results suggested a possible role for DNA-PKcs protecting developing brain tissues from DNA double-strand breaks.
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Affiliation(s)
- Aoi OKAWA
- Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, Tokyo, Japan
| | - Takamitsu MORIOKA
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Tatsuhiko IMAOKA
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Shizuko KAKINUMA
- Department of Radiation Effects Research, National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Yoshihisa MATSUMOTO
- Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, Tokyo, Japan
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Schofield PN, Kulka U, Tapio S, Grosche B. Big data in radiation biology and epidemiology; an overview of the historical and contemporary landscape of data and biomaterial archives. Int J Radiat Biol 2019; 95:861-878. [DOI: 10.1080/09553002.2019.1589026] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Paul N. Schofield
- Department of Physiology, Development, and Neuroscience, University of Cambridge, Cambridge, UK
| | - Ulrike Kulka
- Bundesamt fuer Strahlenschutz, Neuherberg, Germany
| | - Soile Tapio
- Helmholtz Zentrum Muenchen, German Research Center for Environmental Health GmbH, Institute of Radiation Biology, Neuherberg, Germany
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