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Gatti M, Belli M, De Rubeis M, Tokita S, Ikema H, Yamashiro H, Fujishima Y, Anderson D, Goh VST, Shinoda H, Nakata A, Fukumoto M, Miura T, Nottola SA, Macchiarelli G, Palmerini MG. Ultrastructural Analysis of Large Japanese Field Mouse ( Apodemus speciosus) Testes Exposed to Low-Dose-Rate (LDR) Radiation after the Fukushima Nuclear Power Plant Accident. BIOLOGY 2024; 13:239. [PMID: 38666851 PMCID: PMC11048324 DOI: 10.3390/biology13040239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Revised: 04/01/2024] [Accepted: 04/02/2024] [Indexed: 04/28/2024]
Abstract
Since the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, great attention has been paid to the impact of chronic low-dose-rate (LDR) radiation exposure on biological systems. The reproductive system is sensitive to radiation, with implications connected to infertility. We investigated the testis ultrastructure of the wild large Japanese field mouse (Apodemus speciosus) from three areas contaminated after the FDNPP accident, with different levels of LDR radiation (0.29 µSv/h, 5.11 µSv/h, and 11.80 µSv/h). Results showed good preservation of the seminiferous tubules, comparable to the unexposed animals (controls), except for some ultrastructural modifications. Increases in the numerical density of lipid droplet clusters in spermatogenic cells were found at high levels of LDR radiation, indicating an antioxidant activity rising due to radiation recovery. In all groups, wide intercellular spaces were found between spermatogenic cells, and cytoplasmic vacuolization increased at intermediate and high levels and vacuolated mitochondria at the high-level. However, these findings were also related to the physiological dynamics of spermatogenesis. In conclusion, the testes of A. speciosus exposed to LDR radiation associated with the FDNPP accident showed a normal spermatogenesis, with some ultrastructural changes. These outcomes may add information on the reproductive potential of mammals chronically exposed to LDR radiation.
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Affiliation(s)
- Marta Gatti
- Department of Anatomy, Histology, Forensic Medicine and Orthopaedics, Sapienza University, 00161 Rome, Italy; (M.G.); (M.D.R.)
| | - Manuel Belli
- Department of Human Sciences and Promotion of the Quality of Life, San Raffaele Roma Open University, 00166 Rome, Italy;
| | - Mariacarla De Rubeis
- Department of Anatomy, Histology, Forensic Medicine and Orthopaedics, Sapienza University, 00161 Rome, Italy; (M.G.); (M.D.R.)
| | - Syun Tokita
- Graduate School of Science and Technology, Niigata University, Niigata 959-2181, Japan
| | - Hikari Ikema
- Graduate School of Science and Technology, Niigata University, Niigata 959-2181, Japan
| | - Hideaki Yamashiro
- Graduate School of Science and Technology, Niigata University, Niigata 959-2181, Japan
| | - Yohei Fujishima
- Department of Risk Analysis and Biodosimetry, Institute of Radiation Emergency Medicine, Hirosaki University, Aomori 036-8564, Japan (D.A.); (T.M.)
| | - Donovan Anderson
- Department of Risk Analysis and Biodosimetry, Institute of Radiation Emergency Medicine, Hirosaki University, Aomori 036-8564, Japan (D.A.); (T.M.)
| | - Valerie Swee Ting Goh
- Department of Radiobiology, Singapore Nuclear Research and Safety Initiative, National University of Singapore, Singapore 138602, Singapore
| | - Hisashi Shinoda
- Graduate School of Dentistry, Tohoku University, Sendai 980-8575, Japan
| | - Akifumi Nakata
- Department of Life Science, Faculty of Pharmaceutical Sciences, Hokkaido University of Science, Hokkaido 006-8585, Japan
| | - Manabu Fukumoto
- RIKEN Center for Advanced Intelligence Project, Pathology Informatics Team, Tokyo 103-0027, Japan;
| | - Tomisato Miura
- Department of Risk Analysis and Biodosimetry, Institute of Radiation Emergency Medicine, Hirosaki University, Aomori 036-8564, Japan (D.A.); (T.M.)
| | - Stefania Annarita Nottola
- Department of Anatomy, Histology, Forensic Medicine and Orthopaedics, Sapienza University, 00161 Rome, Italy; (M.G.); (M.D.R.)
| | - Guido Macchiarelli
- Department of Life, Health and Environmental Sciences, University of L’Aquila, 67100 L’Aquila, Italy;
| | - Maria Grazia Palmerini
- Department of Life, Health and Environmental Sciences, University of L’Aquila, 67100 L’Aquila, Italy;
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Maruyama K, Wang B, Watanabe Y. Dose estimation to wild medaka around Fukushima Dai-ichi nuclear power plant. RADIATION PROTECTION DOSIMETRY 2023:ncad140. [PMID: 37122264 DOI: 10.1093/rpd/ncad140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 03/23/2023] [Accepted: 03/26/2023] [Indexed: 06/19/2023]
Abstract
More than 10 y have passed since the Fukushima Dai-ichi Nuclear Power Plant (F1-NPP) accident, but there are still many areas with high levels of radioactive contamination, especially reservoirs and lakes, where the levels decrease slowly. The exposed dose to non-human biota is of great concern. In this work, the exposure dose to wild medaka (small aquarium fish) around F1-NPP was measured/estimated by two approaches: in situ measurement and with the ERICA assessment tool. S2 is a reservoir located 7.5 km from F1-NPP, and the ambient dose rate was 25.0 μSv per h in 2012, but decreased to 4.82 μSv per h in 2021. The external exposure dose rate to wild medaka living there was 0.8-11.8 μGy per h (2017-21) by in situ measurement, and the estimated dose rate with the ERICA assessment tool was 0.6-54.5 μGy per h (2012-21). The estimated and measured doses to wild medaka are not expected to cause any significant radiation effects.
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Affiliation(s)
- Kouichi Maruyama
- National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Bing Wang
- National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Yoshito Watanabe
- National Institute of Radiological Sciences, National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
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Sayed AEDH, Nagata K, Nakazawa T, Mitani H, Kobayashi J, Oda S. Low Dose-Rate Irradiation of Gamma-Rays-Induced Cytotoxic and Genotoxic Alterations in Peripheral Erythrocytes of p53-Deficient Medaka (Oryzias latipes). FRONTIERS IN MARINE SCIENCE 2021. [DOI: 10.3389/fmars.2021.773481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Morphological alterations and nuclear abnormalities in fish erythrocytes have been used in many studies as bioindicators of environmental mutagens including ionizing radiation. In this study, adult Japanese medaka (Oryzias latipes) were irradiated with gamma rays at a low dose rate (9.92 μGy/min) for 7 days, giving a total dose of 100 mGy; and morphological alterations, nuclear abnormalities, and apoptotic cell death induced in peripheral erythrocytes were investigated 8 h and 7 days after the end of the irradiation. A variety of abnormalities, such as tear-drop cell, crenated cell, acanthocyte, sickled cell, micronucleated cell, eccentric nucleus, notched nucleus, and schistocyte, were induced in the peripheral erythrocytes of the wild-type fish, and a less number of abnormalities and apoptotic cell death were induced in the p53-deficient fish. These results indicate that low dose-rate chronic irradiation of gamma rays can induce cytotoxic and genotoxic effects in the peripheral erythrocytes of medaka, and p53-deficient medaka are tolerant to the gamma-ray irradiation than the wild type on the surface.
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