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Horie Y, Kanazawa N, Takahashi C, Tatarazako N, Iguchi T. Gonadal Soma-Derived Factor Expression is a Potential Biomarker for Predicting the Effects of Endocrine-Disrupting Chemicals on Gonadal Differentiation in Japanese Medaka (Oryzias Latipes). Environ Toxicol Chem 2022; 41:1875-1884. [PMID: 35502944 DOI: 10.1002/etc.5353] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 01/20/2022] [Accepted: 04/27/2022] [Indexed: 06/14/2023]
Abstract
Chemicals with androgenic or estrogenic activity induce the sex reversal and/or intersex condition in various teleost fish species. Previously, we reported that exposure to 17α-methyltestosterone, bisphenol A, or 4-nonylphenol induces changes in expression of the gonadal soma-derived factor (gsdf) gene accompanied by disruption of gonadal differentiation in Japanese medaka (Oryzias latipes). These findings suggest that gsdf expression might be a useful biomarker for predicting the potential effect of chemicals on gonadal differentiation. We examined the gsdf expression in Japanese medaka exposed to chemicals with estrogenic or androgenic activity. Exposure to the androgenic steroid 17β-trenbolone at 0.5-22.1 μg/L induced the development of ovotestis (presence of ovarian tissue with testicular tissue) and female-to-male sex reversal in XX embryos, and exposure at 6.32 and 22.1 μg/L significantly increased gsdf expression in XX embryos compared with controls at developmental stage 38 (1 day before hatching). In the present study, no statistically significant difference in gsdf mRNA expression was observed after exposure to 17β-estradiol, 17α-ethinylestradiol, and 4-t-octylphenol, which have estrogenic activity. In addition, antiandrogenic chemicals or chemicals without endocrine-disrupting activity did not induce changes in gsdf expression in XX or XY embryos. Thus, an increase in gsdf expression after androgen exposure was observed in XX embryos. Together, these findings indicate that gsdf expression might be useful for predicting the adverse effect of chemicals on gonadal differentiation. Environ Toxicol Chem 2022;41:1875-1884. © 2022 SETAC.
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Affiliation(s)
- Yoshifumi Horie
- Faculty of Bioresource Sciences, Akita Prefectural University, Nakano Simoshinjo, Akita, Japan
- Research Center for Inland Seas, Kobe University, Kobe, Japan
| | - Nobuhiro Kanazawa
- Faculty of Systems Science and Technology, Akita Prefectural University, Akita, Japan
| | - Chiho Takahashi
- Faculty of Bioresource Sciences, Akita Prefectural University, Nakano Simoshinjo, Akita, Japan
| | - Norihisa Tatarazako
- Department of Science and Technology for Biological Resources and Environment, Graduate School of Agriculture, Ehime University, Matsuyama, Japan
| | - Taisen Iguchi
- Department of Nanobioscience, Yokohama City University, Yokohama, Japan
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Toyota K, Yasugi M, Tatarazako N, Iguchi T, Watanabe E. Laterally biased diffusion of males of the water flea Daphnia magna. J Exp Zool A Ecol Integr Physiol 2022; 337:626-638. [PMID: 35416429 DOI: 10.1002/jez.2595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 12/29/2021] [Accepted: 03/17/2022] [Indexed: 06/14/2023]
Abstract
The water flea, Daphnia magna, is a representative zooplankton that lives in freshwater environments. It primarily propagates via asexual reproduction in normal and healthy environmental conditions. Unsuitable environmental conditions induce D. magna to change its mode of reproduction from asexual to sexual reproduction. During sexual reproduction, D. magna produces special tough eggs (resting eggs) that can survive severe environmental conditions. Despite an increase in our understanding of their mating behavior, the sex-specific characteristics of swimming behavior among daphnid species are poorly understood. In this study, we analysed the swimming patterns and dynamics of female and male adult D. magna using computer modeling. Males displayed laterally biased diffusion in contrast to the homogeneous, nondirectional diffusion of females. Computer modeling analysis using a discrete-time Markov chain simulation, in which the frequencies of turning behavior were evaluated as probability distributions, explained the greater diffusion of males in the horizontal direction. We presumed that high diffusion in the horizontal direction would increase the probability of encountering a distant mate. Our findings suggest that male D. magna increases genotypic heterogeneity by effectively selecting certain motion parameters.
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Affiliation(s)
- Kenji Toyota
- Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies), Okazaki, Japan
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, Higashiyama, Myodaiji, Okazaki, Japan
- Marine Biological Station, Sado Center for Ecological Sustainability, Niigata University, Sado, Japan
- Department of Biological Sciences, Faculty of Science, Kanagawa University, Hiratsuka, Japan
- Department of Biological Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, Tokyo, Japan
| | - Masaki Yasugi
- Laboratory of Neurophysiology, National Institute for Basic Biology, Okazaki, Japan
- Faculty of Engineering, Utsunomiya University, Utsunomiya, Japan
| | - Norihisa Tatarazako
- Department of Science and Technology for Biological Resources and Environment, Graduate School of Agriculture, Ehime University, Matsuyama, Japan
| | - Taisen Iguchi
- Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies), Okazaki, Japan
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, Higashiyama, Myodaiji, Okazaki, Japan
- Graduate School of Nanobioscience, Yokohama City University, Yokohama, Japan
| | - Eiji Watanabe
- Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies), Okazaki, Japan
- Laboratory of Neurophysiology, National Institute for Basic Biology, Okazaki, Japan
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Toyota K, Watanabe H, Hirano M, Abe R, Miyakawa H, Song Y, Sato T, Miyagawa S, Tollefsen KE, Yamamoto H, Tatarazako N, Iguchi T. Juvenile hormone synthesis and signaling disruption triggering male offspring induction and population decline in cladocerans (water flea): Review and adverse outcome pathway development. Aquat Toxicol 2022; 243:106058. [PMID: 34965494 DOI: 10.1016/j.aquatox.2021.106058] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 12/12/2021] [Accepted: 12/13/2021] [Indexed: 05/21/2023]
Abstract
Juvenile hormone (JH) are a family of multifunctional hormones regulating larval development, molting, metamorphosis, reproduction, and phenotypic plasticity in arthropods. Based on its importance in arthropod life histories, many insect growth regulators (IGRs) mimicking JH have been designed to control harmful insects in agriculture and aquaculture. These JH analogs (JHAs) may also pose hazards to nontarget species by causing unexpected endocrine-disrupting (ED) effects such as molting and metamorphosis defects, larval lethality, and disruption of the sexual identity. This critical review summarizes the current knowledge of the JH-mediated effects in the freshwater cladoceran crustaceans such as Daphnia species on JHA-triggered endocrine disruptive outputs to establish a systematic understanding of JHA effects. Based on the current knowledge, adverse outcome pathways (AOPs) addressing the JHA-mediated ED effects in cladoceran leading to male offspring production and subsequent population decline were developed. The weight of evidence (WoE) of AOPs was assessed according to established guidelines. The review and AOP development aim to present the current scientific understanding of the JH pathway and provide a robust reference for the development of tiered testing strategies and new risk assessment approaches for JHAs in future ecotoxicological research and regulatory processes.
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Affiliation(s)
- Kenji Toyota
- Marine Biological Station, Sado Center for Ecological Sustainability, Niigata University, 87 Tassha, Sado, Niigata 952-2135, Japan; Department of Biological Sciences, Faculty of Science, Kanagawa University, 2946 Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan; Department of Biological Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan.
| | - Haruna Watanabe
- Health and Environmental Risk Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
| | - Masashi Hirano
- Department of Bioscience, School of Agriculture, Tokai University, Kumamoto City, Kumamoto 862-8652, Japan
| | - Ryoko Abe
- Health and Environmental Risk Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Hitoshi Miyakawa
- Center for Bioscience Research and Education, Utsunomiya University, 350 Mine-machi, Utsunomiya, Tochigi 321-8505, Japan
| | - You Song
- Norwegian Institute for Water Research (NIVA), Section of Ecotoxicology and Risk Assessment, Gaustadalléen, Oslo, Norway
| | - Tomomi Sato
- Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan
| | - Shinichi Miyagawa
- Department of Biological Science and Technology, Faculty of Advanced Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Knut Erik Tollefsen
- Norwegian Institute for Water Research (NIVA), Section of Ecotoxicology and Risk Assessment, Gaustadalléen, Oslo, Norway; Norwegian University of Life Sciences (NMBU), Faculty of Environmental Science and Technology, Department of Environmental Sciences (IMV), Ås, Norway
| | - Hiroshi Yamamoto
- Health and Environmental Risk Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Norihisa Tatarazako
- Department of Science and Technology for Biological Resources and Environment, Graduate School of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime 790-8566, Japan
| | - Taisen Iguchi
- Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan.
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Kawashima Y, Onishi Y, Tatarazako N, Yamamoto H, Koshio M, Oka T, Horie Y, Watanabe H, Nakamoto T, Yamamoto J, Ishikawa H, Sato T, Yamazaki K, Iguchi T. Summary of 17 chemicals evaluated by OECD TG229 using Japanese Medaka, Oryzias latipes in EXTEND 2016. J Appl Toxicol 2021; 42:750-777. [PMID: 34725835 PMCID: PMC9297976 DOI: 10.1002/jat.4255] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 09/13/2021] [Accepted: 09/25/2021] [Indexed: 11/07/2022]
Abstract
In June 2016, the Ministry of the Environment of Japan announced a program "EXTEND2016" on the implementation of testing and assessment for endocrine active chemicals, consisting of a two-tiered strategy. The aim of the Tier 1 screening and the Tier 2 testing is to identify the impacts on the endocrine system and to characterize the adverse effects to aquatic animals by endocrine disrupting chemicals detected in the aquatic environment in Japan. For the consistent assessment of the effects on reproduction associated with estrogenic, anti-estrogenic, androgenic, and/or anti-androgenic activities of chemicals throughout Tier 1 screening to Tier 2 testing, a unified test species, Japanese medaka (Oryzias latipes), has been used. For Tier 1 screening, the in vivo Fish Short-Term Reproduction Assay (OECD test guideline No. 229) was conducted for 17 chemicals that were nominated based on the results of environmental monitoring, existing knowledge obtained from a literature survey, and positive results in reporter gene assays using the estrogen receptor of Japanese medaka. In the 17 assays using Japanese medaka, adverse effects on reproduction (i.e., reduction in fecundity and/or fertility) were suggested for 10 chemicals, and a significant increase of hepatic vitellogenin in males, indicating estrogenic (estrogen receptor agonistic) potency, was found for eight chemicals at the concentrations in which no overt toxicity was observed. Based on these results, and the frequency and the concentrations detected in the Japanese environment, estrone, 4-nonylphenol (branched isomers), 4-tert-octylphenol, triphenyl phosphate, and bisphenol A were considered as high priority candidate substances for the Tier 2 testing.
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Affiliation(s)
- Yukio Kawashima
- Environmental Consulting Department, Japan NUS Co., Tokyo, Japan
| | - Yuta Onishi
- Institute of Environmental Ecology, IDEA Consultants, Inc., Shizuoka, Japan
| | - Norihisa Tatarazako
- Department of Science and Technology for Biological Resources and Environment, Graduate School of Agriculture, Ehime University, Matsuyama, Japan.,Health and Environmental Risk Division, National Institute for Environmental Studies, Tsukuba, Japan
| | | | - Masaaki Koshio
- Health and Environmental Risk Division, National Institute for Environmental Studies, Tsukuba, Japan
| | - Tomohiro Oka
- Health and Environmental Risk Division, National Institute for Environmental Studies, Tsukuba, Japan.,Resources Recycling Center, Japan Environmental Management Association for Industry, Tokyo, Japan
| | - Yoshifumi Horie
- Health and Environmental Risk Division, National Institute for Environmental Studies, Tsukuba, Japan.,Research Center for Inland Sea (KURCIS), Kobe University, Kobe, Japan
| | - Haruna Watanabe
- Health and Environmental Risk Division, National Institute for Environmental Studies, Tsukuba, Japan
| | - Takashi Nakamoto
- Institute of Environmental Ecology, IDEA Consultants, Inc., Shizuoka, Japan
| | - Jun Yamamoto
- Institute of Environmental Ecology, IDEA Consultants, Inc., Shizuoka, Japan
| | - Hidenori Ishikawa
- Institute of Environmental Ecology, IDEA Consultants, Inc., Shizuoka, Japan
| | - Tomomi Sato
- Nanobioscience Department, Yokohama City University, Yokohama, Japan
| | - Kunihiko Yamazaki
- Environmental Health Department, Ministry of the Environment of Japan, Tokyo, Japan
| | - Taisen Iguchi
- Nanobioscience Department, Yokohama City University, Yokohama, Japan
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Tani K, Watanabe H, Noguchi M, Hiki K, Yamagishi T, Tatarazako N, Yamamoto H. Toxicity assessment of typical polycyclic aromatic hydrocarbons to Daphnia magna and Hyalella azteca in water-only and sediment-water exposure systems. Sci Total Environ 2021; 784:147156. [PMID: 34088053 DOI: 10.1016/j.scitotenv.2021.147156] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 04/09/2021] [Accepted: 04/11/2021] [Indexed: 06/12/2023]
Abstract
While the equilibrium partitioning (EqP) method has been demonstrated to effectively predict the adverse effects of nonionic organic chemicals in sediment on benthic organisms by sediment toxicity tests, only a limited number of studies have been performed both in water-only and whole-sediment toxicity tests using the same species and verified the validity of EqP-based toxicity assessment. To further examine the validity of the EqP method for application in a wide range of hydrophobicity, we conducted sorption/desorption experiments and both water-only and sediment toxicity tests using a popular aquatic crustacean species, Daphnia magna (48 h), and benthic species Hyalella azteca (96 h) for six typical polycyclic aromatic hydrocarbons (PAHs) with three to five rings and an amine derivative: anthracene, phenanthrene, fluoranthene, pyrene, benzo[a]pyrene, dibenzo[a,h]anthracene, and 1-aminopyrene. The linear sorption coefficient was determined and ranged from 2.7 × 102 (phenanthrene) and 1.2 × 104 L/kg (benzo[a]pyrene) highly depending on the hydrophobicity while the aqueous concentrations were stable after 24 h in the desorption test. As result of acute toxicity tests in the water-only exposure system, anthracene and dibenz[a,h]anthracene were found to be nontoxic to both species, while median effect/lethal concentrations (EC50/LC50) were determined as ranging from 0.66 (benzo[a]pyrene) to 330 μg/L (phenanthrene), and from 11 (1-aminopyrene) to 180 μg/L (phenanthrene) for D. magna and H. azteca, respectively. Among these compounds, three PAHs with three, four, and five rings each, and 1-aminopyrene were subjected to sediment-water toxicity tests. In the sediment-water tests, the LC50 of phenanthrene and pyrene was three to six times higher than that of the water-only tests for H. azteca while the EC50 was 1.1 to 2.0 times higher for D. magna. In contrast, the EC50/LC50 of benzo[a]pyrene (BaP) in the sediment-water toxicity test was more than 5 times higher than that in the water-only test for both H. azteca and D. magna. The EC50/LC50 values of 1-aminopyrene were similar in both the sediment-water and the water-only toxicity tests, ranging narrowly from 21 to 28 μg/L and 8.8 to 11 μg/L for D. magna and H. azteca, respectively. The EC50/LC50 based on the body residue (ER50/LR50) was investigated for two of the representative PAHs, pyrene, and BaP. The ER50/LR50 of pyrene in both species was 2.3 and 11 times higher in the water-only toxicity test for D. magna and H. azteca, respectively, while those of BaP in the sediment-water toxicity test were not calculated for the sediment-water toxicity tests, and the highest body concentration in the sediment-water tests was lower than the ER50/LR50 in the water-only toxicity test. Although the experimental results were comparable with the predicted sediment toxicity values based on the EqP method for the selected PAHs in this study, there is a risk of phenanthrene and pyrene being slightly underestimated (1.4-1.9 fold for phenanthrene and 3.7-6.1 fold for pyrene) by the EqP method for H. azteca. These results reaffirm that the bioavailability of poorly water-soluble chemicals is important for sediment toxicity and that the exposure pathway should be further investigated to avoid under- and overestimation via the EqP method.
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Affiliation(s)
- Kazune Tani
- Department of Natural Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8563, Japan; Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Haruna Watanabe
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Mana Noguchi
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Kyoshiro Hiki
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Takahiro Yamagishi
- Department of Natural Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8563, Japan; Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Norihisa Tatarazako
- Graduate School of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime 790-8566, Japan
| | - Hiroshi Yamamoto
- Department of Natural Environmental Studies, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8563, Japan; Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
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Onishi Y, Tatarazako N, Koshio M, Okamura T, Watanabe H, Sawai A, Yamamoto J, Ishikawa H, Sato T, Kawashima Y, Yamazaki K, Iguchi T. Summary of reference chemicals evaluated by the fish short-term reproduction assay, OECD TG229, using Japanese Medaka, Oryzias latipes. J Appl Toxicol 2021; 41:1200-1221. [PMID: 33486801 PMCID: PMC8359193 DOI: 10.1002/jat.4104] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 10/14/2020] [Accepted: 10/14/2020] [Indexed: 12/13/2022]
Abstract
Under the Organisation for Economic Co-operation and Development (OECD), the Ministry of the Environment of Japan (MOE) added Japanese medaka (Oryzias latipes) to the test guideline fish short-term reproduction assay (FSTRA) developed by the United States Environmental Protection Agency (US EPA) using fathead minnow (Pimephales promelas). The FSTRA was designed to detect endocrine disrupting effects of chemicals interacting with the hypothalamic-pituitary-gonadal axis (HPG axis) such as agonists or antagonists on the estrogen receptor (Esr) and/or the androgen receptor (AR) and steroidogenesis inhibitors. We conducted the FSTRA with Japanese medaka, in accordance with OECD test guideline number 229 (TG229), for 16 chemicals including four Esr agonists, two Esr antagonists, three AR agonists, two AR antagonists, two steroidogenesis inhibitors, two progesterone receptor agonists, and a negative substance, and evaluated the usability and the validity of the FSTRA (TG229) protocol. In addition, in vitro reporter gene assays (RGAs) using Esr1 and ARβ of Japanese medaka were performed for the 16 chemicals, to support the interpretation of the in vivo effects observed in the FSTRA. In the present study, all the test chemicals, except an antiandrogenic chemical and a weak Esr agonist, significantly reduced the reproductive status of the test fish, that is, fecundity or fertility, at concentrations where no overt toxicity was observed. Moreover, vitellogenin (VTG) induction in males and formation of secondary sex characteristics (SSC), papillary processes on the anal fin, in females was sensitive endpoints to Esr and AR agonistic effects, respectively, and might be indicators of the effect concentrations in long-term exposure. Overall, it is suggested that the in vivo FSTRA supported by in vitro RGA data can adequately detect effects on the test fish, O. latipes, and probably identify the mode of action (MOA) of the chemicals tested.
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Affiliation(s)
- Yuta Onishi
- Institute of Environmental EcologyIDEA Consultants, Inc.YaizuJapan
| | - Norihisa Tatarazako
- Department of Science and Technology for Biological Resources and Environment, Graduate School of AgricultureEhime UniversityMatsuyamaJapan
- Center for Environmental Risk ResearchNational Institute for Environmental StudiesTsukubaJapan
| | - Masaaki Koshio
- Center for Environmental Risk ResearchNational Institute for Environmental StudiesTsukubaJapan
| | - Tetsuro Okamura
- Institute of Environmental EcologyIDEA Consultants, Inc.YaizuJapan
| | - Haruna Watanabe
- Center for Environmental Risk ResearchNational Institute for Environmental StudiesTsukubaJapan
| | - Atsushi Sawai
- Institute of Environmental EcologyIDEA Consultants, Inc.YaizuJapan
| | - Jun Yamamoto
- Institute of Environmental EcologyIDEA Consultants, Inc.YaizuJapan
| | | | - Tomomi Sato
- NanobioscienceYokohama City UniversityYokohamaJapan
| | | | - Kunihiko Yamazaki
- Environmental Health DepartmentMinistry of the EnvironmentTokyoJapan
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Horie Y, Chiba T, Takahashi C, Tatarazako N, Iguchi T. Influence of triphenyltin on morphologic abnormalities and the thyroid hormone system in early-stage zebrafish (Danio rerio). Comp Biochem Physiol C Toxicol Pharmacol 2021; 242:108948. [PMID: 33285321 DOI: 10.1016/j.cbpc.2020.108948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 11/23/2020] [Accepted: 11/29/2020] [Indexed: 10/22/2022]
Abstract
In the present study, we assessed the negative effects of triphenyltin (TPT) on zebrafish (Danio rerio) by exposing embryos and early-stage larvae to various concentrations of TPT from 2 h after fertilization (haf) until 30 days after hatching (dah). Whether test groups were fed or fasted during ecotoxicity studies using fish models has varied historically, and whether this experimental condition influences test results is unknown. Here, we confirmed that the lethal concentration of TPT to embryo and early-stage larvae (i.e., 3 dah or younger) showed in fed (lowest observed effect concentration (LOEC); 6.34 μg/L) and fasted (LOEC; 6.84 μg/L) groups. In addition, 84% and 100% of the larvae in the 2.95 and 6.64 μg/L exposure groups, respectively, had uninflated swim bladders; all affected larvae died within 9 dah. This finding suggests that morphologic abnormalities in early larval zebrafish are useful as endpoints for predicting the lethality of chemical substances after hatching. We then assessed the expression of several genes in the thyroid hormone pathway, which regulates swim bladder development in many fish species, including zebrafish. Larvae exposed to 6.64 μg/L TPT showed significant increases in the mRNA expression levels of thyroid hormone receptor α (trα) and trβ but not of thyroid stimulating hormone β subunit. These findings suggest that TPT disrupts the thyroid system in zebrafish.
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Affiliation(s)
- Yoshifumi Horie
- Faculty of Bioresource Sciences, Akita Prefectural University, 241-438 Kaidobata-Nishi Nakano Simoshinjo, Akita 010-0195, Japan.
| | - Takashi Chiba
- Faculty of Bioresource Sciences, Akita Prefectural University, 241-438 Kaidobata-Nishi Nakano Simoshinjo, Akita 010-0195, Japan
| | - Chiho Takahashi
- Faculty of Bioresource Sciences, Akita Prefectural University, 241-438 Kaidobata-Nishi Nakano Simoshinjo, Akita 010-0195, Japan
| | - Norihisa Tatarazako
- Department of Science and Technology for Biological Resources and Environment, Graduate School of Agriculture, Ehime University, Tarumi 3-5-7, Matsuyama 790-8566, Japan
| | - Taisen Iguchi
- Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan
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Hirano M, Toyota K, Ishibashi H, Tominaga N, Sato T, Tatarazako N, Iguchi T. Molecular Insights into Structural and Ligand Binding Features of Methoprene-Tolerant in Daphnids. Chem Res Toxicol 2020; 33:2785-2792. [PMID: 33089992 DOI: 10.1021/acs.chemrestox.0c00179] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Juvenile hormone (JH) is an important endocrine factor regulating many biological activities in arthropods. In daphnids, methoprene-tolerant (Met) belongs to a basic helix-loop-helix/Per-Arnt-Sim (bHLH/PAS) family protein which has recently been confirmed as a JH receptor and can bind and be activated by JHs and JH agonists. Although the activation of the JH signaling pathway causes many physiological effects, the molecular basis for the structural feature and ligand binding properties of Daphnia Met are not fully understood. To study the ligand preference in terms of structural features of Daphnia Met, we built in silico homology models of the PAS-B domain of Daphnia Mets from cladoceran crustaceans, Daphnia pulex and D. magna. Structural comparison of two Daphnia Met PAS-B domain models revealed that the volume in the main cavity of D. magna Met was larger than that of D. pulex Met. Compared with insect Met, Daphnia Met had a less hydrophobic cavity due to polar residues in the core-binding site. Molecular docking simulations of JH and its analogs with Daphnia Met indicated that the interaction energies were correlated with each of the experimental values of in vivo JH activities based on male induction and in vitro Met-mediated transactivation potencies. Furthermore, in silico site-directed mutagenesis supported experimental findings that Thr292 in D. pulex Met and Thr296 in D. magna Met substitution to valine contribute to JH selectivity and differential species response. This study demonstrates that in silico simulations of Daphnia Met and its ligands may be a tool for predicting the ligand profile and cross species sensitivity.
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Affiliation(s)
- Masashi Hirano
- Department of Biological and Chemical Systems Engineering, National Institute of Technology, Kumamoto College, 2627 Hirayama-shinmachi, Yatsushiro, Kumamoto 866-8501, Japan
| | - Kenji Toyota
- Department of Biological Science, Faculty of Science, Kanagawa University, 2946 Tsuchiya, Hiratsuka, Kanagawa 259-1293, Japan
| | - Hiroshi Ishibashi
- Graduate School of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, Japan
| | - Nobuaki Tominaga
- Department of Creative Engineering, National Institute of Technology, Ariake College, 150 Higashi-Hagio, Omuta, Fukuoka 836-8585, Japan
| | - Tomomi Sato
- Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan
| | - Norihisa Tatarazako
- Graduate School of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama 790-8566, Japan
| | - Taisen Iguchi
- Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan
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9
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Okamoto A, Masunaga S, Tatarazako N. Chronic toxicity of 50 metals to Ceriodaphnia dubia. J Appl Toxicol 2020; 41:375-386. [PMID: 33034080 DOI: 10.1002/jat.4049] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 07/24/2020] [Accepted: 07/27/2020] [Indexed: 11/09/2022]
Abstract
Metals are essential elements for human life but may cause disorders when exposure is excessive. Previously, we reported on the acute toxicity of 50 metals; however, the chronic toxicity data of some metals are not available. Therefore, we conducted chronic toxicity tests to determine the effects of 50 metals on the water flea, Ceriodaphnia dubia. The IC20 of 20 metals (Be, Sc, Cr, Co, Ni, Cu, Zn, Y, Ru, Ag, Cd, In, Te, W, Os, Pt, Au, Hg, Tl and Pb) were <100 μg/L; nine metals (Al, V, As, Se, Zr, Nb, Rh, Sb and Bi) were 100 ≤ IC20 < 1000 μg/L; 16 metals (Li, Mg, K, Ti, Mn, Fe, Ga, Ge, Rb, Sr, Mo, Sn, Cs, Ba, Re and Ir) were 1000 ≤ IC20 ≤ 100 000 μg/L; and two metals (Na and Ca) were >100 000 μg/L. Three metals (Pd, Hf and Ta) did not show IC20 at the upper limit of respective aqueous solubility, and IC20 s were not obtained. The maximum test concentrations (almost aqueous solubility) of Pd, Hf and Ta were 83, 2400 and 5.3 μg/L, respectively. These data show the high correlation between our IC50 s for C. dubia and those for Dahpnia magna published previously. The IC50 s of 47 metals were not correlated with electronegativity, first ionization energy, atomic weight, atomic number, covalent radius, atomic radius or ionic radius.
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Affiliation(s)
- Akira Okamoto
- Graduate School of Frontier Science, The University of Tokyo, Kashiwa, Chiba, Japan
| | - Shigeki Masunaga
- Graduate School of Environment and Information Sciences, Yokohama National University, Hodogaya, Yokohama, Kanagawa, Japan
| | - Norihisa Tatarazako
- Graduate School of Frontier Science, The University of Tokyo, Kashiwa, Chiba, Japan.,Center for Health and Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
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10
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Horie Y, Kanazawa N, Takahashi C, Tatarazako N, Iguchi T. Exposure to 4-nonylphenol induces a shift in the gene expression of gsdf and testis-ova formation and sex reversal in Japanese medaka (Oryzias latipes). J Appl Toxicol 2020; 41:399-409. [PMID: 32852118 DOI: 10.1002/jat.4051] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 07/28/2020] [Accepted: 07/28/2020] [Indexed: 01/14/2023]
Abstract
The branched isomer mixture 4-nonylphenol (4-NP) has been used worldwide as a surfactant, and can have endocrine-disrupting effects on aquatic organisms. For instance, 4-NP induces the formation of testis-ova (i.e., testicular and ovarian tissue in the same gonad) or male to female sex reversal of various teleost fishes. Recently, our group revealed that altered gsdf gene expression is associated with disruption of gonadal differentiation in Japanese medaka (Oryzias latipes) embryos exposed to methyltestosterone or bisphenol A, suggesting that gsdf might be useful as a biomarker for predicting the impact of endocrine-disrupting chemicals (EDCs) on gonadal differentiation. Here, we used 4-NP to examine further whether gsdf expression at the embryo stage is useful for predicting EDC impact on gonadal sex differentiation. When fertilized medaka eggs were exposed to 32 or 100 μg/L 4-NP, testis-ova in genetic males and sex reversal from genetic male to phenotypic female were observed. At stage 38 (just before hatching), 4-NP exposure at 1-100 μg/L did not affect gsdf expression in XX embryos compared with the nontreated control; however, in XY embryos, the gsdf expression in the 100 μg/L-exposed group was significantly lower than that in the controls. The 4-NP concentration at which gsdf expression was suppressed was equal to that at which testis-ova and sex reversal were induced. These results indicate that expression of the gsdf gene at the embryonic stage in medaka is a useful biomarker for predicting the impact of EDCs on sexual differentiation.
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Affiliation(s)
- Yoshifumi Horie
- Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
| | - Nobuhiko Kanazawa
- Faculty of Systems Science and Technology, Akita Prefectural University, Akita, Japan
| | - Chiho Takahashi
- Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
| | - Norihisa Tatarazako
- Department of Science and Technology for Biological Resources and Environment, Graduate School of Agriculture, Ehime University, Matsuyama, Japan
| | - Taisen Iguchi
- Nanobioscience, Yokohama City University, Yokohama, Japan
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11
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Horie Y, Kanazawa N, Takahashi C, Tatarazako N, Iguchi T. Bisphenol A induces a shift in sex differentiation gene expression with testis-ova or sex reversal in Japanese medaka (Oryzias latipes). J Appl Toxicol 2020; 40:804-814. [PMID: 32020657 DOI: 10.1002/jat.3945] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 12/10/2019] [Accepted: 12/24/2019] [Indexed: 11/10/2022]
Abstract
Bisphenol A (BPA), a very important raw material in the plastics industry, is an endocrine-disrupting chemical in teleost fish. Although BPA induces testis-ova and sex reversal in teleost fish species, the molecular mechanism remains unclear. We evaluated the effects of BPA (measured concentrations: 45, 92, 326, 1030 and 3406 μg/L) on Japanese medaka (Oryzias latipes) using OECD TG234 (2011, Fish Sexual Development Test, OECD Guidelines for the Testing of Chemicals, Section 2). BPA at 1030 and 3406 μg/L induced testis-ova and sex reversal with female-type secondary sexual characteristics in XY males at 30 and 60 days posthatching (dph). Then we examined the BPA effect on the expression of sex differentiation genes related to the testis-ova and sex reversal in XY medaka. BPA exposure (1030 and 3406 μg/L) suppressed gsdf mRNA expression and increased cyp19a1a mRNA expression in XY individuals at stage 38 and 30 dph, although foxl2 mRNA expression showed no change. Interestingly, the concentration of BPA that suppressed gsdf mRNA expression at the larval stage was consistent with that needed to induce testis-ova and sex reversal. These results suggest that the gsdf gene at the embryonic stage can be used as a useful biomarker for predicting the impact of estrogenic endocrine-disrupting chemicals on sexual differentiation in Japanese medaka.
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Affiliation(s)
- Yoshifumi Horie
- Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
| | - Nobuhiko Kanazawa
- Faculty of Systems Science and Technology, Akita Prefectural University, Akita, Japan
| | - Chiho Takahashi
- Faculty of Bioresource Sciences, Akita Prefectural University, Akita, Japan
| | - Norihisa Tatarazako
- Department of Science and Technology for Biological Resources and Environment, Graduate School of Agriculture, Matsuyama, Japan
| | - Taisen Iguchi
- Nanobioscience, Yokohama City University, Yokohama, Japan
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12
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Yamagishi T, Fuchida S, Katsumata M, Horie Y, Mori F, Kitayama A, Kawachi M, Koshikawa H, Nozaki T, Kumagai H, Ishibashi JI, Tatarazako N. Evaluation of the toxicity of leaches from hydrothermal sulfide deposits by means of a delayed fluorescence-based bioassay with the marine cyanobacterium Cyanobium sp. NIES-981. Ecotoxicology 2018; 27:1303-1309. [PMID: 30311132 DOI: 10.1007/s10646-018-1989-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 09/27/2018] [Indexed: 06/08/2023]
Abstract
The commercial use of metals such as copper, lead, and zinc has markedly increased in recent years, resulting in increased interest in deep-sea mining of seafloor hydrothermal sulfide deposits. However, the full extent of the impact of deep-sea mining at hydrothermal field deposits on the environment remains unclear. In addition to impacting the deep sea, the leaching of heavy metals from extracted sulfide mineral may also affect the upper ocean zones as the sulfide rock is retrieved from the seafloor. Here, we used a delayed fluorescence-based bioassay using the marine cyanobacterium Cyanobium sp. NIES-981 to evaluate the toxicity of three sulfide core samples obtained from three drill holes at the Izena Hole, middle Okinawa Trough, East China Sea. Leaches from two of the cores contained high concentrations of zinc and lead, and they markedly inhibited delayed fluorescence in Cyanobium sp. NIES-981 compared with control. By examining the toxicity of artificial mixed-metal solutions with metal compositions similar to those of the leaches, we confirmed that this inhibition was a result of high zinc and lead concentrations into the leaches. In addition, we conclude that this delayed fluorescence-based bioassay is a viable method for use by deep-sea mining operations because it is quicker and requires less laboratory space and equipment than the standard assay.
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Affiliation(s)
- Takahiro Yamagishi
- Research Center for Health and Environmental Risk, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
| | - Shigeshi Fuchida
- Center for Regional Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Masakazu Katsumata
- Central Research Laboratory, Hamamatsu Photonics K. K., 5000 Hirakuchi, Higashi-ku, Hamamatsu, Shizuoka, 434-8601, Japan
| | - Yoshifumi Horie
- Research Center for Health and Environmental Risk, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
- Department of Biology Environment, Akita Prefectural University, 241-438 Kaidobata-Nishi Nakano Shimoshinjo, Akita, 010-0195, Japan
| | - Fumi Mori
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Akiko Kitayama
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Masanobu Kawachi
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Hiroshi Koshikawa
- Center for Regional Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Tatsuo Nozaki
- Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
| | - Hidenori Kumagai
- Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
| | - Jun-Ichiro Ishibashi
- Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Norihisa Tatarazako
- Research Center for Health and Environmental Risk, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
- Faculty of Agriculture, Ehime University, 30507 Tarumi, Matsuyama, Ehime, 790-8566, Japan
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13
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Horie Y, Yamagishi T, Yagi A, Shintaku Y, Iguchi T, Tatarazako N. The non‐steroidal anti‐inflammatory drug diclofenac sodium induces abnormal embryogenesis and delayed lethal effects in early life stage zebrafish (
Danio rerio
). J Appl Toxicol 2018; 39:622-629. [DOI: 10.1002/jat.3752] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 10/04/2018] [Accepted: 10/15/2018] [Indexed: 12/14/2022]
Affiliation(s)
- Yoshifumi Horie
- Faculty of Bioresource SciencesAkita Prefectural University 241‐438 Kaidobata‐Nishi, Nakano Simoshinjo Akita 010‐0195 Japan
| | - Takahiro Yamagishi
- Center for Health and Environmental Risk ResearchNational Institute for Environmental Studies 16‐2 Onogawa, Tsukuba Ibaraki 305‐8506 Japan
| | - Ayano Yagi
- Center for Health and Environmental Risk ResearchNational Institute for Environmental Studies 16‐2 Onogawa, Tsukuba Ibaraki 305‐8506 Japan
| | - Yoko Shintaku
- Center for Health and Environmental Risk ResearchNational Institute for Environmental Studies 16‐2 Onogawa, Tsukuba Ibaraki 305‐8506 Japan
| | - Taisen Iguchi
- Graduate School of NanobioscienceYokohama City University 22‐2 Seto, Kanazawa‐ku Yokohama 236‐0027 Japan
| | - Norihisa Tatarazako
- Graduate School of AgricultureEhime University Tarumi 3‐5‐7 Matsuyama 790‐8566 Japan
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14
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Ogino Y, Tohyama S, Kohno S, Toyota K, Yamada G, Yatsu R, Kobayashi T, Tatarazako N, Sato T, Matsubara H, Lange A, Tyler CR, Katsu Y, Iguchi T, Miyagawa S. Functional distinctions associated with the diversity of sex steroid hormone receptors ESR and AR. J Steroid Biochem Mol Biol 2018; 184:38-46. [PMID: 29885351 DOI: 10.1016/j.jsbmb.2018.06.002] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 05/26/2018] [Accepted: 06/04/2018] [Indexed: 12/13/2022]
Abstract
Sex steroid hormones including estrogens and androgens play fundamental roles in regulating reproductive activities and they act through estrogen and androgen receptors (ESR and AR). These steroid receptors have evolved from a common ancestor in association with several gene duplications. In most vertebrates, this has resulted in two ESR subtypes (ESR1 and ESR2) and one AR, whereas in teleost fish there are at least three ESRs (ESR1, ESR2a and ESR2b) and two ARs (ARα and ARβ) due to a lineage-specific whole genome duplication. Functional distinctions have been suggested among these receptors, but to date their roles have only been characterized in a limited number of species. Sexual differentiation and the development of reproductive organs are indispensable for all animal species and in vertebrates these events depend on the action of sex steroid hormones. Here we review the recent progress in understanding of the functions of the ESRs and ARs in the development and expression of sexually dimorphic characteristics associated with steroid hormone signaling in vertebrates, with representative fish, amphibians, reptiles, birds and mammals.
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Affiliation(s)
- Yukiko Ogino
- Attached Promotive Centre for International Education and Research of Agriculture, Faculty of Agriculture, Kyushu University, Fukuoka, Fukuoka 812-8581, Japan
| | - Saki Tohyama
- Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, Shizuoka 422-8526, Japan
| | - Satomi Kohno
- Department of Biology, St. Cloud State University, St. Cloud, MN 56301, USA
| | - Kenji Toyota
- Department of Biological Sciences, Kanagawa University, Hiratsuka, Kanagawa 259-1293, Japan; Faculty of Industrial Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
| | - Gen Yamada
- Institute of Advanced Medicine, Wakayama Medical University, Wakayama, Wakayama 641-8509, Japan
| | - Ryohei Yatsu
- Department of Integrative Biology, University of Texas at Austin, Austin, Texas 78712, USA
| | - Tohru Kobayashi
- Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, Shizuoka 422-8526, Japan
| | | | - Tomomi Sato
- Graduate School of Nanobioscience, Yokohama City University, Yokohama, Kanagawa 236-0027, Japan
| | - Hajime Matsubara
- Department of Aquatic Biology, Faculty of Bioindustry, Tokyo University of Agriculture, Abashiri, Hokkaido 099-2493, Japan
| | - Anke Lange
- Biosciences, College of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4QD, UK
| | - Charles R Tyler
- Biosciences, College of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4QD, UK
| | - Yoshinao Katsu
- Graduate School of Life Science, Hokkaido University, Sapporo 060-0809, Japan
| | - Taisen Iguchi
- Graduate School of Nanobioscience, Yokohama City University, Yokohama, Kanagawa 236-0027, Japan.
| | - Shinichi Miyagawa
- Faculty of Industrial Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan; Institute of Advanced Medicine, Wakayama Medical University, Wakayama, Wakayama 641-8509, Japan.
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15
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Horie Y, Kanazawa N, Yamagishi T, Yonekura K, Tatarazako N. Ecotoxicological Test Assay Using OECD TG 212 in Marine Java Medaka (Oryzias javanicus) and Freshwater Japanese Medaka (Oryzias latipes). Bull Environ Contam Toxicol 2018; 101:344-348. [PMID: 30022344 DOI: 10.1007/s00128-018-2398-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 07/12/2018] [Indexed: 06/08/2023]
Abstract
The lethal effects of chemicals is a serious concern to the protection of ecosystems, and the OECD TG 212 was established to estimate the lethal and sublethal effects on embryo and sac-fry stages of fish. It is still unclear, however, whether this test can effectively estimate the impacts of chemicals using marine fish. Therefore, this study aimed to use a recognized testing method on the marine fish Oryzias javanicus, and to assess differences in response to organotin compounds between a freshwater congener (Oryzias latipes) and O. javanicus. The lowest observed effect concentration (LOEC) of triphenyltin for lethal effect was the same in both species. The LOEC of tributyltin for lethal and sublethal effects were the same in both species. Our results provide the first evidence that O. javanicus and O. latipes are similarly affected by organotin compounds, suggesting that O. javanicus is a good model marine fish for the ecotoxicological assessment of chemicals.
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Affiliation(s)
- Yoshifumi Horie
- Faculty of Bioresource Sciences, Akita Prefectural University, 241-438 Kaidobata-Nishi, Nakano Shimoshinjo, Akita, 010-0195, Japan.
| | - Nobuhiro Kanazawa
- Faculty of System Science and Technology, Akita Prefectural University, 84-4 Ebinokuchi, Tsuchiya, Yurihonjo, Akita, 015-0055, Japan
| | - Takahiro Yamagishi
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Kei Yonekura
- Faculty of Bioresource Sciences, Akita Prefectural University, 241-438 Kaidobata-Nishi, Nakano Shimoshinjo, Akita, 010-0195, Japan
| | - Norihisa Tatarazako
- Graduate School of Agriculture, Ehime University, Tarumi 3-5-7, Matsuyama, 790-8566, Japan
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16
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Tanaka Y, Nakamura K, Oda S, Watanabe H, Tatarazako N. Estimation of population-level effect of the endocrine disruptor pyriproxyfen in Daphnia magna by using changes in sex ratio and reproductive output. Ecotoxicol Environ Saf 2018; 156:463-475. [PMID: 29605666 DOI: 10.1016/j.ecoenv.2018.03.044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 02/27/2018] [Accepted: 03/19/2018] [Indexed: 06/08/2023]
Abstract
Here we developed an analytical means of estimating population-level effects of endocrine disruptors on Daphnia magna. Our approach was based on the fact that the endocrine-disrupting juvenile hormone analogs induce the production of male neonates if they are exposed to the analogs during a particular period in their prenatal development; the method also assumed that the abnormal production of male neonates in the sake of production of female neonates reduces population growth. We constructed a linear toxicodynamics model to elucidate the period in which D. magna neonates are sensitive to exposure to the analog and also the probability of an individual neonate changing sex under specific exposure concentrations. The proposed model was applied to D. magna reproduction test data obtained under time-varying exposure to pyriproxyfen to derive the maximum-likelihood estimates and the posterior distributions of the model parameters. To quantitatively assess the ecological risk at the population level, we conducted a population dynamics simulation under two time-varying exposure scenarios (i.e., constant or pulsed exposure) by using an age-structured population model. When the change in sex ratio was based on the time-weighted average concentration during the period of sensitivity, change in sex ratio caused approximately equivalent population-level effects as did reproductive inhibition (i.e., reduction in the total number of neonates per female parent) regardless of the exposure scenario. In contrast, when change in sex ratio was based on maximum concentration during the sensitive period, change in sex ratio caused only half the population-level effects as did reproductive inhibition under constant exposure, whereas it caused a much larger population-level effect than did reproductive inhibition under pulsed exposure.
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Affiliation(s)
- Yoshinari Tanaka
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, Japan; Sophia University, Graduate School of Global Environmental Studies, 7-1 Kioicho, Chiyoda-ku, Tokyo, Japan.
| | - Kensei Nakamura
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, Japan
| | - Shigeto Oda
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, Japan
| | - Haruna Watanabe
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, Japan
| | - Norihisa Tatarazako
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, Japan; Ehime University, Graduate School of Agriculture, 10-13 Dogo-Himata, Matsuyama, Ehime, Japan
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17
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Horie Y, Yamagishi T, Shintaku Y, Iguchi T, Tatarazako N. Effects of tributyltin on early life-stage, reproduction, and gonadal sex differentiation in Japanese medaka (Oryzias latipes). Chemosphere 2018; 203:418-425. [PMID: 29631114 DOI: 10.1016/j.chemosphere.2018.03.135] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 03/16/2018] [Accepted: 03/19/2018] [Indexed: 06/08/2023]
Abstract
Tributyltin, an organotin compound, was used worldwide as an antifouling agent in aquatic environments and there has been much concern about the toxicological and ecotoxicological properties of organotin compounds. Even though it has been prohibited worldwide, tributyltin is still detected at low concentrations in aquatic environments. Here we investigated the effects of tributyltin on the early life-stage, reproduction, and gonadal sex differentiation in Japanese medaka (Oryzias latipes). In adults, exposure to tributyltin at 3.82 μg/L suppressed fecundity and fertility and increased mortality. At 10.48 μg/L all medaka died by the sixth day of exposure. Exposure to tributyltin during early life-stages induced no significant differences in mortality or embryonic development, but growth was suppressed in groups exposed to 0.13 and 0.68 μg/L. Furthermore, there was no abnormal gonadal development in Japanese medaka exposed to tributyltin. These results provide evidence of the negative effects of tributyltin on reproduction in a teleost fish. Tributyltin did not affect gonadal sex differentiation in Japanese medaka, but fecundity and fertility were suppressed, although it is not clear whether this suppression resulted from the endocrine-disrupting action of tributyltin or its toxicity.
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Affiliation(s)
- Yoshifumi Horie
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan; Faculty of Bioresource Sciences, Akita Prefectural University, 241-438 Kaidobata-Nishi, Nakano Simoshinjo, Akita 010-0195, Japan
| | - Takahiro Yamagishi
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Yoko Shintaku
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Taisen Iguchi
- Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan
| | - Norihisa Tatarazako
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan; Department of Science and Technology for Biological Resources and Environment, Graduate School of Agriculture, Ehime University, Tarumi 3-5-7, Matsuyama 790-8566, Japan.
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18
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Watanabe H, Oda S, Abe R, Tanaka Y, Tatarazako N. Comparison of the effects of constant and pulsed exposure with equivalent time-weighted average concentrations of the juvenile hormone analog pyriproxyfen on the reproduction of Daphnia magna. Chemosphere 2018; 195:810-816. [PMID: 29289908 DOI: 10.1016/j.chemosphere.2017.12.124] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 12/16/2017] [Accepted: 12/20/2017] [Indexed: 06/07/2023]
Abstract
Short-term pulsed exposure tests have been increasingly used to evaluate the ecotoxicity of pollutants of which concentrations vary over time in the field. In pulsed exposure, time-weighted average (TWA) concentration is often used as an index of exposure. However, there have been few studies to demonstrate whether TWA concentration can be used to evaluate the effect of endocrine-disrupting chemicals on the daphnids. Pyriproxyfen is one of the juvenile hormone analogs that induces daphnids to produce male offspring. To evaluate whether peak or TWA concentration can explain the effects of pyriproxyfen on daphnid reproduction, we measured the number of offspring and the proportion of male offspring produced by Daphnia magna during 21-day under different exposure treatments, constant, single-pulse, and multi-pulse exposure, at an equivalent TWA concentration. Constant exposure of 50 ng/L pyriproxyfen did not affect either the fecundity or the proportion of male offspring, while a single-pulse exposure of 525 ng/L pyriproxyfen over 2 day at four different age did not reduce fecundity, but the proportion of male offspring increased age dependently. Multi-pulses exposure of 131 ng/L pyriproxyfen over two days four times (total eight days) resulted in a decrease in fecundity and the highest proportion of male offspring. Daily observation demonstrated that male offspring was only produced several days after the exposure to a certain concentration of pyriproxyfen. Therefore, neither TWA nor peak concentration accurately evaluated the effects of pulsed exposure of pyriproxyfen on the reproduction of D. magna, particularly its effect on the proportion of male offspring.
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Affiliation(s)
- Haruna Watanabe
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
| | - Shigeto Oda
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
| | - Ryoko Abe
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
| | - Yoshinari Tanaka
- Graduate School of Global Environmental Studies, Sophia University, 7-1, Kioicho, Chiyoda-ku, Tokyo, 102-8554, Japan.
| | - Norihisa Tatarazako
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2, Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
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Katsumata M, Ikushima Y, Bennett K, Sato Y, Takeuchi A, Tatarazako N, Hakamata T. Validation of rapid algal bioassay using delayed fluorescence in an interlaboratory ring study. Sci Total Environ 2017; 605-606:842-851. [PMID: 28683428 DOI: 10.1016/j.scitotenv.2017.06.228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 05/26/2017] [Accepted: 06/26/2017] [Indexed: 06/07/2023]
Abstract
Algal growth inhibition tests are generally used to determine the toxic effects of chemical substances on algae growth. In this report, we describe a rapid and simple test procedure using delayed fluorescence (DF) to determine chemical toxicities more rapidly than the conventional 72h or 96h growth inhibition tests. We assess the suitability of DF to serve as an alternative endpoint for biomass production and determine the variability by an interlaboratory ring study using a typical reference toxicant 3,5-dichlorophenol (DCP). The results suggest that DF has the potential to be used as a surrogate measure of photosynthetically-active biomass in the algal growth inhibition tests. The half maximal effective concentration (EC50) values of DCP determined from the DF inhibition test in 6h and 24h (1.2±0.3mg/L and 2.7±0.5mg/L respectively) are in reasonable agreement with the EC50 value of DCP determined by the 72h conventional method (1.8mg/L). In the interlaboratory ring study, the intralaboratory and interlaboratory variabilities of the EC50 of the DF inhibition test for a 24h exposure period are 12% and 28% respectively. DF intensity can be considered as a surrogate of living biomass with active photosynthesis, and we conclude that a 24h exposure duration better estimates the toxic effects measured using conventional surrogate measures for dry weight such as cell counts, volume, optical density or fluorescence.
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Affiliation(s)
| | - Yuko Ikushima
- Central Research Laboratory, Hamamatsu Photonics K.K., Japan
| | - Keith Bennett
- Central Research Laboratory, Hamamatsu Photonics K.K., Japan
| | - Yukiko Sato
- Central Research Laboratory, Hamamatsu Photonics K.K., Japan
| | - Ayano Takeuchi
- Central Research Laboratory, Hamamatsu Photonics K.K., Japan
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Flynn K, Lothenbach D, Whiteman F, Hammermeister D, Touart LW, Swintek J, Tatarazako N, Onishi Y, Iguchi T, Johnson R. Summary of the development the US Environmental Protection Agency's Medaka Extended One Generation Reproduction Test (MEOGRT) using data from 9 multigenerational medaka tests. Environ Toxicol Chem 2017; 36:3387-3403. [PMID: 28857258 PMCID: PMC6681917 DOI: 10.1002/etc.3923] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 06/20/2017] [Accepted: 07/20/2017] [Indexed: 05/22/2023]
Abstract
In response to various legislative mandates, the US Environmental Protection Agency (USEPA) formed its Endocrine Disruptor Screening Program (EDSP), which in turn, formed the basis of a tiered testing strategy to determine the potential of pesticides, commercial chemicals, and environmental contaminants to disrupt the endocrine system. The first tier of tests is intended to detect the potential for endocrine disruption mediated through estrogen, androgen, or thyroid pathways, whereas the second tier is intended to further characterize the effects on these pathways and to establish a dose-response relationship for adverse effects. One of these tier 2 tests, the Medaka Extended One Generation Reproduction Test (MEOGRT), was developed by the USEPA for the EDSP and, in collaboration with the Japanese Ministry of the Environment, for the Guidelines for the Testing of Chemicals of the Organisation for Economic Co-operation and Development (OECD). The MEOGRT protocol was iteratively modified based on knowledge gained after the successful completion of 9 tests with variations in test protocols. The present study describes both the final MEOGRT protocol that has been published by the USEPA and the OECD, and the iterations that provided valuable insights into nuances of the protocol. The various tests include exposure to 17β-estradiol, 4-t-octylphenol, o,p'- dichlorodiphenyltrichloroethane, 4-chloro-3-methylphenol, tamoxifen, 17β-trenbolone, vinclozolin, and prochloraz. Environ Toxicol Chem 2017;36:3387-3403. Published 2017 Wiley Periodicals Inc. on behalf of SETAC. This article is a US government work and, as such, is in the public domain in the United States of America.
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Affiliation(s)
- Kevin Flynn
- US Environmental Protection Agency, Mid-Continent Ecology Division, Duluth, MN, USA
- Address correspondence to Kevin Flynn, USEPA MED, 6201 Congdon Blvd, Duluth, MN 55804, (218) 529-5120,
| | - Doug Lothenbach
- US Environmental Protection Agency, Mid-Continent Ecology Division, Duluth, MN, USA
| | - Frank Whiteman
- US Environmental Protection Agency, Mid-Continent Ecology Division, Duluth, MN, USA
| | - Dean Hammermeister
- US Environmental Protection Agency, Mid-Continent Ecology Division, Duluth, MN, USA
| | | | | | | | - Yuta Onishi
- Institute of Environmental Ecology, IDEA Consultants Inc., Shizuoka, Japan
| | - Taisen Iguchi
- National Institute for Basic Biology, Okazaki, Japan
| | - Rodney Johnson
- US Environmental Protection Agency, Mid-Continent Ecology Division, Duluth, MN, USA
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21
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Horie Y, Yamagishi T, Takahashi H, Iguchi T, Tatarazako N. Effects of triclosan on Japanese medaka (Oryzias latipes) during embryo development, early life stage and reproduction. J Appl Toxicol 2017; 38:544-551. [PMID: 29181881 DOI: 10.1002/jat.3561] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 10/04/2017] [Accepted: 10/10/2017] [Indexed: 01/09/2023]
Abstract
Triclosan has been shown to have endocrine-disrupting effects in aquatic organisms. In 2016, the US Food and Drug Administration banned the use of triclosan in consumer soaps. Before the ban, triclosan was reported at low concentrations in the aquatic environment, although the effect of triclosan on reproduction in teleost fish species is yet to be clarified. Here we investigated the effects of triclosan on embryo development and reproduction, and during the early life stage, in Japanese medaka (Oryzias latipes) by using Organisation for Economic Co-operation and Development tests 229, 212 and 210, with minor modifications. In adult medaka, exposure to 345.7 μg l-1 suppressed fecundity and increased mortality but had no effect on fertility. Exposure to 174.1 or 345.7 μg l-1 increased liver vitellogenin concentration in females but decreased liver vitellogenin concentration in males. With triclosan exposure, mortality was increased dose dependently during the embryonic and early larval stages, and a particularly steep increase in mortality was observed soon after hatching. The lowest observed effect concentrations of triclosan in Japanese medaka obtained in the present study (mortality [embryonic and larval stages, 276.3 μg l-1 ; early life stage, 134.4 μg l-1 ; adult stage, 174.1 μg l-1 ], growth [134.4 μg l-1 ], vitellogenin [174.1 μg l-1 ], fecundity [345.7 μg l-1 ] and fertility [>345.7 μg l-1 ]) were at least 55 times (compared with the USA) and up to 13 400 times (compared with Germany) greater than the detected triclosan levels in the aquatic environment. These results suggest that triclosan may not be affecting fish populations in the aquatic environment.
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Affiliation(s)
- Yoshifumi Horie
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Takahiro Yamagishi
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Hiroko Takahashi
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Taisen Iguchi
- Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, 236-0027, Japan
| | - Norihisa Tatarazako
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
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22
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Horie Y, Watanabe H, Takanobu H, Shigemoto Y, Yamagishi T, Iguchi T, Tatarazako N. Effects of triphenyltin on reproduction in Japanese medaka (Oryzias latipes) across two generations. Aquat Toxicol 2017; 192:16-23. [PMID: 28910659 DOI: 10.1016/j.aquatox.2017.08.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 08/22/2017] [Accepted: 08/28/2017] [Indexed: 06/07/2023]
Abstract
Triphenyltin (TPT) is an organotin compound used in marine anti-fouling coatings to prevent the attachment and growth of marine organisms, and it has negative effects on aquatic organisms. TPT is still detected at low concentrations, although its use has been prohibited at least in the European Community and is restricted in Japan as well. Studies using Japanese medaka (Oryzias latipes) indicate that TPT has the potential to inhibit reproduction. Although TPT is detected in many aquatic ecosystems, the multi-generational impact of TPT remains unknown. We investigated the two-generational effects of TPT on Japanese medaka and examined the relationships of several such effects between the F0 and F1 generations. Suppression of fecundity was observed in both generations, and fertility and growth were inhibited in the F1 generation. Moreover, delayed hatching and lower hatchability were observed in F1 embryos. Importantly, the value of the lowest observed effect concentration (LOEC) for these influences in F1 was lower than that in F0: that is, the LOEC values of fecundity and mortality were 3.2μg/L in the F0 generation and 1.0μg/L in the F1 generation. Fertility was not affected by TPT in F0, whereas it was significantly suppressed in the 1.0μg/L-exposure group of the F1 generation. Our results provide the first evidence of the effects of TPT on reproduction in a teleost fish across two generations, highlighting the concern that TPT could affect reproduction and mortality at decreasing concentrations in temporally overlapping generations.
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Affiliation(s)
- Yoshifumi Horie
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Haruna Watanabe
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Hitomi Takanobu
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Yoshiko Shigemoto
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Takahiro Yamagishi
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Taisen Iguchi
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, and Department of Basic Biology, School of Life Science, Graduate University for Advanced Studies, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan; Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan
| | - Norihisa Tatarazako
- Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
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Furuhama A, Hayashi TI, Yamamoto H, Tatarazako N. External validation of acute-to-chronic models for estimation of reproductive toxicity to Daphnia magna. SAR QSAR Environ Res 2017; 28:765-781. [PMID: 29022371 DOI: 10.1080/1062936x.2017.1381989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 09/17/2017] [Indexed: 06/07/2023]
Abstract
We evaluated the predictivity and applicability of previously proposed models for the reproductive toxicity of chemicals to Daphnia magna [SAR QSAR Environ. Res. 27:10, 833-850] by using external data from the United States Environmental Protection Agency database ECOTOX. These models were based on quantitative structure-activity-activity relationships (QSAARs) and a quantitative activity-activity relationship (QAAR): the models can be categorized as acute-to-chronic models with (QSAAR) and without (QAAR) structural and physicochemical (e.g. distribution coefficients, log D) descriptors. We found that the QSAAR models were suitable for chemicals with an '-NH2 attached to aromatic carbon' sub-structure, whereas the QAAR model was better for multicomponent compounds, coordination complexes, tin compounds and straight-chain primary amines. For chemicals with a known specific mode of action (e.g. pesticides and antibacterial agents and their derivatives), toxicity estimation within the acute-to-chronic framework requires special attention. We evaluated the applicability of the models on the basis of the descriptors in the models. We recommend that chemicals be pre-screened before their toxicities are estimated with these models: pre-screening enabled the estimation of the toxicities of some chemicals within the applicability domains of the models.
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Affiliation(s)
- A Furuhama
- a Centre for Health and Environmental Risk Research, National Institute for Environmental Studies (NIES) , Tsukuba , Ibaraki , Japan
| | - T I Hayashi
- a Centre for Health and Environmental Risk Research, National Institute for Environmental Studies (NIES) , Tsukuba , Ibaraki , Japan
| | - H Yamamoto
- a Centre for Health and Environmental Risk Research, National Institute for Environmental Studies (NIES) , Tsukuba , Ibaraki , Japan
| | - N Tatarazako
- a Centre for Health and Environmental Risk Research, National Institute for Environmental Studies (NIES) , Tsukuba , Ibaraki , Japan
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24
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Tohyama S, Ogino Y, Lange A, Myosho T, Kobayashi T, Hirano Y, Yamada G, Sato T, Tatarazako N, Tyler CR, Iguchi T, Miyagawa S. Establishment of estrogen receptor 1 (ESR1)-knockout medaka: ESR1 is dispensable for sexual development and reproduction in medaka, Oryzias latipes. Dev Growth Differ 2017; 59:552-561. [DOI: 10.1111/dgd.12386] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 06/14/2017] [Accepted: 06/14/2017] [Indexed: 01/08/2023]
Affiliation(s)
- Saki Tohyama
- Graduate School of Nutritional and Environmental Sciences; University of Shizuoka; Shizuoka 422-8526 Japan
- Graduate School of Nanobioscience; Yokohama City University; Yokohama Kanagawa 236-0027 Japan
| | - Yukiko Ogino
- Faculty of Agriculture; Kyushu University; Fukuoka 812-8581 Japan
| | - Anke Lange
- Biosciences; College of Life and Environmental Sciences; University of Exeter; Exeter EX4 4QD UK
| | - Taijun Myosho
- Graduate School of Nutritional and Environmental Sciences; University of Shizuoka; Shizuoka 422-8526 Japan
| | - Tohru Kobayashi
- Graduate School of Nutritional and Environmental Sciences; University of Shizuoka; Shizuoka 422-8526 Japan
| | - Yu Hirano
- Institute of Advanced Medicine; Wakayama Medical University; Wakayama 641-8509 Japan
| | - Gen Yamada
- Institute of Advanced Medicine; Wakayama Medical University; Wakayama 641-8509 Japan
| | - Tomomi Sato
- Graduate School of Nanobioscience; Yokohama City University; Yokohama Kanagawa 236-0027 Japan
| | - Norihisa Tatarazako
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; Tsukuba Ibaraki 305-8506 Japan
| | - Charles R. Tyler
- Biosciences; College of Life and Environmental Sciences; University of Exeter; Exeter EX4 4QD UK
| | - Taisen Iguchi
- Graduate School of Nanobioscience; Yokohama City University; Yokohama Kanagawa 236-0027 Japan
| | - Shinichi Miyagawa
- Institute of Advanced Medicine; Wakayama Medical University; Wakayama 641-8509 Japan
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Affiliation(s)
- Kenji Toyota
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies), 5-1 Higashiyama, M
| | - Tomomi Sato
- Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto,Kanazawa-ku, Yokohama 236-0027, Japan
| | - Norihisa Tatarazako
- Ecotoxicity Reference Laboratory, Risk Assessment Science Collaboration Office, Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Taisen Iguchi
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies), 5-1 Higashiyama, M
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26
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Horie Y, Yamagishi T, Takahashi H, Shintaku Y, Iguchi T, Tatarazako N. Assessment of the lethal and sublethal effects of 20 environmental chemicals in zebrafish embryos and larvae by using OECD TG 212. J Appl Toxicol 2017; 37:1245-1253. [DOI: 10.1002/jat.3487] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2016] [Revised: 04/07/2017] [Accepted: 04/07/2017] [Indexed: 01/09/2023]
Affiliation(s)
- Yoshifumi Horie
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; 16-2 Onogawa Tsukuba Ibaraki 305-8506 Japan
| | - Takahiro Yamagishi
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; 16-2 Onogawa Tsukuba Ibaraki 305-8506 Japan
| | - Hiroko Takahashi
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; 16-2 Onogawa Tsukuba Ibaraki 305-8506 Japan
| | - Youko Shintaku
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; 16-2 Onogawa Tsukuba Ibaraki 305-8506 Japan
| | - Taisen Iguchi
- Nanobioscience; Yokohama City University; 22-2 Seto Kanazawa-ku Yokohama 236-0027 Japan
| | - Norihisa Tatarazako
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; 16-2 Onogawa Tsukuba Ibaraki 305-8506 Japan
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27
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Yamagishi T, Horie Y, Tatarazako N. Synergism between macrolide antibiotics and the azole fungicide ketoconazole in growth inhibition testing of the green alga Pseudokirchneriella subcapitata. Chemosphere 2017; 174:1-7. [PMID: 28152378 DOI: 10.1016/j.chemosphere.2017.01.071] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 01/11/2017] [Accepted: 01/12/2017] [Indexed: 06/06/2023]
Abstract
Macrolide antibiotics and azole fungicides are detected widely in the aquatic environment as a result of their increased use in humans and animal livestock disease and their incomplete removal by wastewater treatment plants. In most cases, ecotoxicological tests are performed by using individual chemical substances, but because of the coexistence of a number of chemicals in the environment, organisms are exposed to many chemicals simultaneously. Therefore, it is important to evaluate effects of chemical interactions, adding to potential hazards of individual chemical. Here, we investigated the synergetic effects of combined chemicals (the azole fungicide ketoconazole and either of two macrolide antibiotics, erythromycin and clarithromycin) in growth inhibition testing using Pseudokirchneriella subcapitata according to OECD Test guideline 201. Combination index plots, isobolograms, and curve-shift analyses revealed that the combination of macrolide antibiotic and ketoconazole at various ratios resulted in strong synergism that enhanced growth inhibition of P. subcapitata, suggesting the necessity of investigating potential hazard of combined chemicals for regulatory purposes.
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Affiliation(s)
- Takahiro Yamagishi
- Ecotoxicity Reference Laboratory, Risk Assessment Science Collaboration Office, Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Yoshifumi Horie
- Ecotoxicity Reference Laboratory, Risk Assessment Science Collaboration Office, Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Norihisa Tatarazako
- Ecotoxicity Reference Laboratory, Risk Assessment Science Collaboration Office, Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
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Toyota K, Sato T, Tatarazako N, Iguchi T. Protein kinase C is involved with upstream signaling of methyl farnesoate for photoperiod-dependent sex determination in the water flea Daphnia pulex. Biol Open 2017; 6:161-164. [PMID: 27965197 PMCID: PMC5312098 DOI: 10.1242/bio.021857] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Sex determination of Daphnia pulex is decided by environmental conditions. We established a suitable experimental system for this study using D. pulex WTN6 strain, in which the sex of the offspring can be controlled by photoperiod. Long-day conditions induced females and short-day conditions induced males. Using this system, we previously found that methy farnesoate (MF), which is a putative innate juvenile hormone molecule in daphnids, is necessary for male sex determination and that protein kinase C (PKC) is a candidate factor of male sex determiner. In this study, we demonstrated that a PKC inhibitor [bisindolylmaleimide IV (BIM)] application strongly suppressed male offspring induction in the short-day condition. Moreover, co-treatment of BIM with MF revealed that PKC signaling acts upstream of MF signaling for male sex determination. This is the first experimental evidence that PKC is involved in the male sex determination process associated with methyl farnesoate signaling in daphnid species. Summary: This study is the first experimental evidence that PKC is involved in the male sex determination process associated with methyl farnesoate signaling in daphnid species.
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Affiliation(s)
- Kenji Toyota
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan.,Environmental Genomics Group, School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Tomomi Sato
- Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan
| | - Norihisa Tatarazako
- Ecotoxicity Reference Laboratory, Risk Assessment Science Collaboration Office, Center for Health and Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Taisen Iguchi
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan .,Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan
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Yamagishi T, Yamaguchi H, Suzuki S, Horie Y, Tatarazako N. Cell reproductive patterns in the green alga Pseudokirchneriella subcapitata (=Selenastrum capricornutum) and their variations under exposure to the typical toxicants potassium dichromate and 3,5-DCP. PLoS One 2017; 12:e0171259. [PMID: 28152022 PMCID: PMC5289587 DOI: 10.1371/journal.pone.0171259] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 01/17/2017] [Indexed: 11/18/2022] Open
Abstract
Pseudokirchneriella subcapitata is a sickle-shaped freshwater green microalga that is normally found in unicellular form. Currently, it is the best known and most frequently used species of ecotoxicological bioindicator because of its high growth rate and sensitivity to toxicants. However, despite this organism's, our knowledge of its cell biology-for example, the patterns of nuclear and cytoplasmic division in the mitotic stage-is limited. Although it has been reported that P. subcapitata proliferates by popularity forming four daughter cells (autospores) through multiple fission after two nuclear divisions, here, we report two additional reproductive patterns by which two autospores are formed by binary fission ("two-autospore type") and eight autospores are formed by multiple fission ("eight-autospore type"). Moreover, we found that cell reproductive patterns differed markedly with the culture conditions or with exposure to either of two typical toxicants, potassium dichromate (K2Cr2O7) and 3,5-dichlorophenol (3,5-DCP). The eight-autospore type occurred at the highest frequency in the early phase of culture, but it disappeared under 3,5-DCP at 2.0 mg/L. Under 0.3 mg/L K2CrO7 (Cr(VI)) the eight-autospore type took substantially longer to appear than in control culture. The two-autospore type occurred only in the late phase of culture. To our knowledge, this is the first detailed evaluation of the reproductive patterns of P. subcapitata, which changed dramatically in the presence of toxicants. These findings suggest that observation of the reproductive patterns of P. subcapitata will help to elucidate different cell reactions to toxicants.
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Affiliation(s)
- Takahiro Yamagishi
- Ecotoxicity Reference Laboratory, Risk Assessment Science Collaboration Office, Center for Health and Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Haruyo Yamaguchi
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Shigekatsu Suzuki
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Yoshifumi Horie
- Ecotoxicity Reference Laboratory, Risk Assessment Science Collaboration Office, Center for Health and Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Norihisa Tatarazako
- Ecotoxicity Reference Laboratory, Risk Assessment Science Collaboration Office, Center for Health and Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
- * E-mail:
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Barata C, Campos B, Rivetti C, LeBlanc GA, Eytcheson S, McKnight S, Tobor-Kaplon M, de Vries Buitenweg S, Choi S, Choi J, Sarapultseva EI, Coutellec MA, Coke M, Pandard P, Chaumot A, Quéau H, Delorme N, Geffard O, Martínez-Jerónimo F, Watanabe H, Tatarazako N, Lopes I, Pestana JLT, Soares AMVM, Pereira CM, De Schamphelaere K. Validation of a two-generational reproduction test in Daphnia magna: An interlaboratory exercise. Sci Total Environ 2017; 579:1073-1083. [PMID: 27908627 PMCID: PMC5488698 DOI: 10.1016/j.scitotenv.2016.11.066] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 11/10/2016] [Accepted: 11/11/2016] [Indexed: 06/01/2023]
Abstract
Effects observed within one generation disregard potential detrimental effects that may appear across generations. Previously we have developed a two generation Daphnia magna reproduction test using the OECD TG 211 protocol with a few amendments, including initiating the second generation with third brood neonates produced from first generation individuals. Here we showed the results of an inter-laboratory calibration exercise among 12 partners that aimed to test the robustness and consistency of a two generation Daphnia magna reproduction test. Pyperonyl butoxide (PBO) was used as a test compound. Following experiments, PBO residues were determined by TQD-LC/MS/MS. Chemical analysis denoted minor deviations of measured PBO concentrations in freshly prepared and old test solutions and between real and nominal concentrations in all labs. Other test conditions (water, food, D. magna clone, type of test vessel) varied across partners as allowed in the OECD test guidelines. Cumulative fecundity and intrinsic population growth rates (r) were used to estimate "No observed effect concentrations "NOEC using the solvent control as the control treatment. EC10 and EC-50 values were obtained regression analyses. Eleven of the twelve labs succeeded in meeting the OECD criteria of producing >60 offspring per female in control treatments during 21days in each of the two consecutive generations. Analysis of variance partitioning of cumulative fecundity indicated a relatively good performance of most labs with most of the variance accounted for by PBO (56.4%) and PBO by interlaboratory interactions (20.2%), with multigenerational effects within and across PBO concentrations explaining about 6% of the variance. EC50 values for reproduction and population growth rates were on average 16.6 and 20.8% lower among second generation individuals, respectively. In summary these results suggest that the proposed assay is reproducible but cumulative toxicity in the second generation cannot reliably be detected with this assay.
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Affiliation(s)
- Carlos Barata
- Department of Environmental chemistry, Institute of Environmental Assessment and Water Research (IDAEA, CSIC), Jordi Girona 18, 08017, Barcelona, Spain.
| | - Bruno Campos
- Department of Environmental chemistry, Institute of Environmental Assessment and Water Research (IDAEA, CSIC), Jordi Girona 18, 08017, Barcelona, Spain
| | - Claudia Rivetti
- Department of Environmental chemistry, Institute of Environmental Assessment and Water Research (IDAEA, CSIC), Jordi Girona 18, 08017, Barcelona, Spain
| | - Gerald A LeBlanc
- Toxicology Program, Department of Biological Sciences, North Carolina State University, Box 7633, Raleigh NC 27695-7633, 850 Main Campus Drive, Raleigh, NC 27606, USA
| | - Stephanie Eytcheson
- Toxicology Program, Department of Biological Sciences, North Carolina State University, Box 7633, Raleigh NC 27695-7633, 850 Main Campus Drive, Raleigh, NC 27606, USA
| | - Stephanie McKnight
- Toxicology Program, Department of Biological Sciences, North Carolina State University, Box 7633, Raleigh NC 27695-7633, 850 Main Campus Drive, Raleigh, NC 27606, USA
| | - Marysia Tobor-Kaplon
- Charles River Laboratories Den Bosch B.V., Dept. of Discovery and Environmental Sciences, Hambakenwetering 7, 5231, DD's-Hertogenbosch, Netherlands
| | - Selinda de Vries Buitenweg
- Charles River Laboratories Den Bosch B.V., Dept. of Discovery and Environmental Sciences, Hambakenwetering 7, 5231, DD's-Hertogenbosch, Netherlands
| | - Suhyon Choi
- Environmental Systems Toxicology Lab., School of Environmental Engineering, University of Seoul, 163, Seoulsiripdae-ro, Dondaemun-gu, Seoul, 02504, Republic of Korea
| | - Jinhee Choi
- Environmental Systems Toxicology Lab., School of Environmental Engineering, University of Seoul, 163, Seoulsiripdae-ro, Dondaemun-gu, Seoul, 02504, Republic of Korea
| | - Elena I Sarapultseva
- National Research Nuclear University "MEPhI", Kashirskoe Highway, 31, Moscow 115409, Russian Federation
| | | | - Maïra Coke
- U3E, Unité d'Ecologie et d'Ecotoxicologie Aquatique, INRA, 35042 Rennes, France
| | - Pascal Pandard
- INERIS, Direction des Risques Chroniques, Unité EXES, Parc technologique ALATA, BP, 2, 60 550 Verneuil en Halatte, France
| | - Arnaud Chaumot
- IRSTEA, UR MALY, Laboratoire d'écotoxicologie, F-69616 Villeurbanne, France
| | - Hervé Quéau
- IRSTEA, UR MALY, Laboratoire d'écotoxicologie, F-69616 Villeurbanne, France
| | - Nicolas Delorme
- IRSTEA, UR MALY, Laboratoire d'écotoxicologie, F-69616 Villeurbanne, France
| | - Olivier Geffard
- IRSTEA, UR MALY, Laboratoire d'écotoxicologie, F-69616 Villeurbanne, France
| | - Fernando Martínez-Jerónimo
- Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas, Lab. de Hidrobiología Experimental, Prol. Carpio esq. Plan de Ayala S/N, Col. Santo Tomas, México, D. F. 11340, Mexico
| | - Haruna Watanabe
- National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Norihisa Tatarazako
- National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Isabel Lopes
- Department of Biology & CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - João L T Pestana
- Department of Biology & CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Amadeu M V M Soares
- Department of Biology & CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Cecilia Manuela Pereira
- Ghent University (UGent), Laboratory of Environmental Toxicology (GhEnToxLab), Coupure Links 653, B9000 Gent, Belgium
| | - Karel De Schamphelaere
- Ghent University (UGent), Laboratory of Environmental Toxicology (GhEnToxLab), Coupure Links 653, B9000 Gent, Belgium
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Horie Y, Yamagishi T, Koshio M, Iguchi T, Tatarazako N. Lethal and sublethal effects of aniline and chlorinated anilines on zebrafish embryos and larvae. J Appl Toxicol 2017; 37:836-841. [DOI: 10.1002/jat.3431] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Revised: 12/06/2016] [Accepted: 12/07/2016] [Indexed: 12/24/2022]
Affiliation(s)
- Yoshifumi Horie
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; 16-2 Onogawa Tsukuba 305-8506 Ibaraki Japan
| | - Takahiro Yamagishi
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; 16-2 Onogawa Tsukuba 305-8506 Ibaraki Japan
| | - Masaaki Koshio
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; 16-2 Onogawa Tsukuba 305-8506 Ibaraki Japan
| | - Taisen Iguchi
- Nanobioscience; Yokohama City University; 22-2 Seto, Kanazawa-ku Yokohama 236-0027 Japan
| | - Norihisa Tatarazako
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; 16-2 Onogawa Tsukuba 305-8506 Ibaraki Japan
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Yamagishi T, Katsumata M, Yamaguchi H, Shimura Y, Kawachi M, Koshikawa H, Horie Y, Tatarazako N. Rapid ecotoxicological bioassay using delayed fluorescence in the marine cyanobacterium Cyanobium sp. (NIES-981). Ecotoxicology 2016; 25:1751-1758. [PMID: 27633095 DOI: 10.1007/s10646-016-1718-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 08/29/2016] [Indexed: 06/06/2023]
Abstract
The use of delayed fluorescence intensity as an endpoint for rapid estimation of the effective concentration (ECx) has been reported as an alternative to standard growth inhibition (at 72 h after exposure) in some algal species including Pseudokirchneriella subcapitata. In marine algae, although an approach of bioassaying using delayed fluorescence measurements has not been performed yet, its development would provide many benefits for marine environmental risk assessment. In this study, we selected marine cyanobacterium Cyanobium sp. (NIES-981) as our test algal species and demonstrated that this species is valid for the standard growth inhibition test based on criteria provide by Organization for Economic Co-operation and Development guidelines. Furthermore, standard inhibition tests and shorter period test using DF were performed in NIES-981 using five chemicals (3,5-DCP, simazine, diflufenican, K2Cr2O7, and CuSO4), and their EC50 and low-toxic-effect values (EC10, EC5, and NOEC) were determined from two dose-response curves. Based on comparisons of the two dose-response curves and the EC50 values, we conclude that DF intensity is useful as an endpoint for rapid estimation of EC50 in NIES-981.
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Affiliation(s)
- Takahiro Yamagishi
- Research Center for Environmental Risk, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Masakazu Katsumata
- Central Research Laboratory, Hamamatsu Photonics K. K., 5000 Hirakuchi, Higashi-ku, Hamamatsu, Shimokanzo, 434-8601, Japan
| | - Haruyo Yamaguchi
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Yohei Shimura
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Masanobu Kawachi
- Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Hiroshi Koshikawa
- Center for Regional Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Yoshifumi Horie
- Research Center for Environmental Risk, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Norihisa Tatarazako
- Research Center for Environmental Risk, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan.
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Furuhama A, Hayashi TI, Tatarazako N. Acute to chronic estimation of Daphnia magna toxicity within the QSAAR framework. SAR QSAR Environ Res 2016; 27:833-850. [PMID: 27767343 DOI: 10.1080/1062936x.2016.1243151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Accepted: 09/26/2016] [Indexed: 06/06/2023]
Abstract
We constructed models for acute to chronic estimation of the Daphnia magna reproductive toxicities of chemical substances from their Daphnia magna acute immobilization toxicities. The models combined the acute toxicities with structural and physicochemical descriptors. We used multiregression analysis and selected the descriptors for the models by means of a genetic algorithm. Of the best 100 models (as indicated by the lack of fit score), 90% included the following descriptors: acute toxicity (i.e. an activity parameter), distribution coefficient (log D) and structural indicator variables that indicate the presence of -NH2 attached to aromatic carbon and the presence of a chlorine atom. We compared the predictive abilities of five of these quantitative structure-activity-activity relationship (QSAAR) acute to chronic estimation models with the predictive ability of a simple linear regression model. The comparison revealed that inclusion of structural and physicochemical descriptors such as those in QSAAR models can improve models for extrapolation from acute to chronic toxicity. Our results also provide a QSAAR framework that is expected to be useful for the further development of chronic toxicity estimation models.
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Affiliation(s)
- A Furuhama
- Centre for Health and Environmental Risk Research, National Institute for Environmental Studies (NIES), Tsukuba, Japan
| | - T I Hayashi
- Centre for Health and Environmental Risk Research, National Institute for Environmental Studies (NIES), Tsukuba, Japan
| | - N Tatarazako
- Centre for Health and Environmental Risk Research, National Institute for Environmental Studies (NIES), Tsukuba, Japan
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Toyota K, Williams TD, Sato T, Tatarazako N, Iguchi T. Comparative ovarian microarray analysis of juvenile hormone-responsive genes in water fleaDaphnia magna: potential targets for toxicity. J Appl Toxicol 2016; 37:374-381. [DOI: 10.1002/jat.3368] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 06/28/2016] [Accepted: 06/28/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Kenji Toyota
- School of Biosciences; University of Birmingham; Birmingham B15 2TT UK
- Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies); Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences; Okazaki Aichi 444-8787 Japan
| | | | - Tomomi Sato
- Graduate School of Nanobioscience; Yokohama City University; Yokohama 236-0027 Japan
| | - Norihisa Tatarazako
- Environmental Quality Measurement Section, Research Center for Environmental Risk; National Institute for Environmental Studies; Ibaraki 305-8506 Japan
| | - Taisen Iguchi
- Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies); Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences; Okazaki Aichi 444-8787 Japan
- Graduate School of Nanobioscience; Yokohama City University; Yokohama 236-0027 Japan
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35
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Horie Y, Watanabe H, Takanobu H, Yagi A, Yamagishi T, Iguchi T, Tatarazako N. Development of anin vivoanti-androgenic activity detection assay using fenitrothion in Japanese medaka (Oryzias latipes). J Appl Toxicol 2016; 37:339-346. [DOI: 10.1002/jat.3365] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 06/04/2016] [Accepted: 06/13/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Yoshifumi Horie
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; Tsukuba Ibaraki Japan
| | - Haruna Watanabe
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; Tsukuba Ibaraki Japan
| | - Hitomi Takanobu
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; Tsukuba Ibaraki Japan
| | - Ayano Yagi
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; Tsukuba Ibaraki Japan
| | - Takahiro Yamagishi
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; Tsukuba Ibaraki Japan
| | - Taisen Iguchi
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, and Department of Basic Biology, School of Life Science; Graduate University for Advanced Studies (SOKENDAI); Okazaki Aichi Japan
- Nanobioscience; Yokohama City University; Yokohama Japan
| | - Norihisa Tatarazako
- Center for Health and Environmental Risk Research; National Institute for Environmental Studies; Tsukuba Ibaraki Japan
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36
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Furuhama A, Hasunuma K, Hayashi TI, Tatarazako N. Predicting algal growth inhibition toxicity: three-step strategy using structural and physicochemical properties. SAR QSAR Environ Res 2016; 27:343-362. [PMID: 27171903 DOI: 10.1080/1062936x.2016.1174151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 03/31/2016] [Indexed: 06/05/2023]
Abstract
We propose a three-step strategy that uses structural and physicochemical properties of chemicals to predict their 72 h algal growth inhibition toxicities against Pseudokirchneriella subcapitata. In Step 1, using a log D-based criterion and structural alerts, we produced an interspecies QSAR between algal and acute daphnid toxicities for initial screening of chemicals. In Step 2, we categorized chemicals according to the Verhaar scheme for aquatic toxicity, and we developed QSARs for toxicities of Class 1 (non-polar narcotic) and Class 2 (polar narcotic) chemicals by means of simple regression with a hydrophobicity descriptor and multiple regression with a hydrophobicity descriptor and a quantum chemical descriptor. Using the algal toxicities of the Class 1 chemicals, we proposed a baseline QSAR for calculating their excess toxicities. In Step 3, we used structural profiles to predict toxicity either quantitatively or qualitatively and to assign chemicals to the following categories: Pesticide, Reactive, Toxic, Toxic low and Uncategorized. Although this three-step strategy cannot be used to estimate the algal toxicities of all chemicals, it is useful for chemicals within its domain. The strategy is also applicable as a component of Integrated Approaches to Testing and Assessment.
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Affiliation(s)
- A Furuhama
- a Centre for Health and Environmental Risk Research , National Institute for Environmental Studies , Tsukuba , Japan
| | - K Hasunuma
- a Centre for Health and Environmental Risk Research , National Institute for Environmental Studies , Tsukuba , Japan
| | - T I Hayashi
- a Centre for Health and Environmental Risk Research , National Institute for Environmental Studies , Tsukuba , Japan
| | - N Tatarazako
- a Centre for Health and Environmental Risk Research , National Institute for Environmental Studies , Tsukuba , Japan
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Tohyama S, Miyagawa S, Lange A, Ogino Y, Mizutani T, Ihara M, Tanaka H, Tatarazako N, Kobayashi T, Tyler CR, Iguchi T. Evolution of estrogen receptors in ray-finned fish and their comparative responses to estrogenic substances. J Steroid Biochem Mol Biol 2016; 158:189-197. [PMID: 26707410 DOI: 10.1016/j.jsbmb.2015.12.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Revised: 12/02/2015] [Accepted: 12/10/2015] [Indexed: 11/23/2022]
Abstract
In vertebrates, estrogens play fundamental roles in regulating reproductive activities through estrogen receptors (ESRs), and disruption of estrogen signaling is now of global concern for both wildlife and human health. To date, ESRs of only a limited number of species have been characterized. We investigated the functional diversity and molecular basis or ligand sensitivity of ESRs among ray-finned fish species (Actinopterygii), the most variable group within vertebrates. We cloned and characterized ESRs from several key species in the evolution of ray-finned fish including bichir (Polypteriformes, ESR1 and ESR2) at the basal lineage of ray-finned fish, and arowana (Osteoglossiformes, ESR1 and ESR2b) and eel (Anguilliformes, ESR1, ESR2a and ESR2b) both belonging to ancient early-branching lineages of teleosts, and suggest that ESR2a and ESR2b emerged through teleost-specific whole genome duplication, but an ESR1 paralogue has been lost in the early lineage of euteleost fish species. All cloned ESR isoforms showed similar responses to endogenous and synthetic steroidal estrogens, but they responded differently to non-steroidal estrogenic endocrine disrupting chemicals (EDCs) (e.g., ESR2a exhibits a weaker reporter activity compared with ESR2b). We show that variation in ligand sensitivity of ESRs can be attributed to phylogeny among species of different taxonomic groups in ray-finned fish. The molecular information provided contributes both to understanding of the comparative role of ESRs in the reproductive biology of fish and their comparative responses to EDCs.
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Affiliation(s)
- Saki Tohyama
- Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka, Shizuoka 422-8526, Japan; Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
| | - Shinichi Miyagawa
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan.
| | - Anke Lange
- University of Exeter, Biosciences, College of Life & Environmental Sciences, Exeter EX4 4QD, United Kingdom
| | - Yukiko Ogino
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
| | - Takeshi Mizutani
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
| | - Masaru Ihara
- Research Center for Environmental Quality Management, Kyoto University, Otsu, Shiga 520-0811, Japan
| | - Hiroaki Tanaka
- Research Center for Environmental Quality Management, Kyoto University, Otsu, Shiga 520-0811, Japan
| | - Norihisa Tatarazako
- Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, Japan
| | - Tohru Kobayashi
- Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka, Shizuoka 422-8526, Japan
| | - Charles R Tyler
- University of Exeter, Biosciences, College of Life & Environmental Sciences, Exeter EX4 4QD, United Kingdom
| | - Taisen Iguchi
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan.
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Watanabe H, Tamura I, Abe R, Takanobu H, Nakamura A, Suzuki T, Hirose A, Nishimura T, Tatarazako N. Chronic toxicity of an environmentally relevant mixture of pharmaceuticals to three aquatic organisms (alga, daphnid, and fish). Environ Toxicol Chem 2016; 35:996-1006. [PMID: 26472177 DOI: 10.1002/etc.3285] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Revised: 06/02/2015] [Accepted: 10/14/2015] [Indexed: 06/05/2023]
Abstract
Principles of concentration addition and independent action have been used as effective tools to predict mixture toxicity based on individual component toxicity. The authors investigated the toxicity of a pharmaceutical mixture composed of the top 10 detected active pharmaceutical ingredients (APIs) in the Tama River (Tokyo, Japan) in a relevant concentration ratio. Both individual and mixture toxicities of the 10 APIs were evaluated by 3 short-term chronic toxicity tests using the alga Pseudokirchneriella subcapitata, the daphnid Ceriodaphnia dubia, and the zebrafish Danio rerio. With the exception of clarithromycin toxicity to alga, the no-observed-effect concentration of individual APIs for each test species was dramatically higher than the highest concentration of APIs found in the environment. The mixture of 10 APIs resulted in toxicity to alga, daphnid, and fish at 6.25 times, 100 times, and 15,000 times higher concentrations, respectively, than the environmental concentrations of individual APIs. Predictions by concentration addition and independent action were nearly identical for alga, as clarithromycin was the predominant toxicant in the mixture. Both predictions described the observed mixture toxicity to alga fairly well, whereas they slightly underestimated the observed mixture toxicity in the daphnid test. In the fish embryo test, the observed toxicity fell between the predicted toxicity by concentration addition and independent action. These results suggested that the toxicity of environmentally relevant pharmaceutical mixtures could be predicted by individual toxicity using either concentration addition or independent action.
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Affiliation(s)
- Haruna Watanabe
- Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Ikumi Tamura
- Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
- Graduate School of Environmental and Life Science, Okayama University, Okayama, Japan
| | - Ryoko Abe
- Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Hitomi Takanobu
- Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Ataru Nakamura
- Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Toshinari Suzuki
- Environmental Science, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Akihiko Hirose
- Division of Risk Assessment, Biological Safety Research Center, National Institute of Health Sciences, Tokyo, Japan
| | - Tetsuji Nishimura
- Faculty of Pharmaceutical Sciences, Teikyo Heisei University, Tokyo, Japan
| | - Norihisa Tatarazako
- Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
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Toyota K, Hiruta C, Ogino Y, Miyagawa S, Okamura T, Onishi Y, Tatarazako N, Iguchi T. Comparative Developmental Staging of Female and Male Water Fleas Daphnia pulex and Daphnia magna During Embryogenesis. Zoolog Sci 2016; 33:31-7. [DOI: 10.2108/zs150116] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Kenji Toyota
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies), 5-1 Higashiyam
| | - Chizue Hiruta
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies), 5-1 Higashiyam
| | - Yukiko Ogino
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies), 5-1 Higashiyam
| | - Shinichi Miyagawa
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies), 5-1 Higashiyam
| | - Tetsuro Okamura
- Institute of Environmental Ecology, IDEA Consultants, Inc., 1334-5 Riemon, Yaizu, Shizuoka 421-0212, Japan
| | - Yuta Onishi
- Institute of Environmental Ecology, IDEA Consultants, Inc., 1334-5 Riemon, Yaizu, Shizuoka 421-0212, Japan
| | - Norihisa Tatarazako
- Environmental Quality Measurement Section, Research Center for Environmental Risk, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Taisen Iguchi
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology, Faculty of Life Science, SOKENDAI (Graduate University for Advanced Studies), 5-1 Higashiyam
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Hayashi TI, Imaizumi Y, Yokomizo H, Tatarazako N, Suzuki N. Ecological risk assessment of herbicides in Japan: Integrating spatiotemporal variation in exposure and effects using a multimedia model and algal density dynamics models. Environ Toxicol Chem 2016; 35:233-240. [PMID: 26183805 DOI: 10.1002/etc.3162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2015] [Revised: 04/29/2015] [Accepted: 07/12/2015] [Indexed: 06/04/2023]
Abstract
Application of herbicides to paddy fields in Japan has strong seasonality, and their environmental concentrations exhibit clear spatiotemporal variation. The authors developed an approach that combines a multimedia environmental exposure model (Grid-Catchment Integrated Modeling System) and density dynamics models for algae. This approach enabled assessment of ecological risk when the exposure concentration shows spatiotemporal variation. First, risk maps of 5 herbicides (pretilachlor, butachlor, simetryn, mefenacet, and esprocarb) were created from the spatial predictions of environmental concentrations and 50% inhibitory concentrations of the herbicides. Simulations of algal density dynamics at high-risk sites were then conducted by incorporating the predicted temporal dynamics of the environmental concentration of each herbicide at the sites. The results suggested that the risk of pretilachlor was clearly the highest of the 5 herbicides, in terms of both the spatial distributions and the temporal durations. The present study highlights the importance of integrating exposure models and effect models to clarify spatial and temporal risk and to develop management plans for chemical exposure that shows high spatiotemporal variation.
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Affiliation(s)
- Takehiko I Hayashi
- Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Yoshitaka Imaizumi
- Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Hiroyuki Yokomizo
- Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Norihisa Tatarazako
- Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
| | - Noriyuki Suzuki
- Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan
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Toyota K, Miyakawa H, Hiruta C, Furuta K, Ogino Y, Shinoda T, Tatarazako N, Miyagawa S, Shaw JR, Iguchi T. Methyl farnesoate synthesis is necessary for the environmental sex determination in the water flea Daphnia pulex. J Insect Physiol 2015; 80:22-30. [PMID: 25721056 DOI: 10.1016/j.jinsphys.2015.02.002] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Revised: 02/04/2015] [Accepted: 02/06/2015] [Indexed: 06/04/2023]
Abstract
Sex-determination systems can be divided into two groups: genotypic sex determination (GSD) and environmental sex determination (ESD). ESD is an adaptive life-history strategy that allows control of sex in response to environmental cues in order to optimize fitness. However, the molecular basis of ESD remains largely unknown. The micro crustacean Daphnia pulex exhibits ESD in response to various external stimuli. Although methyl farnesoate (MF: putative juvenile hormone, JH, in daphnids) has been reported to induce male production in daphnids, the role of MF as a sex-determining factor remains elusive due to the lack of a suitable model system for its study. Here, we establish such a system for ESD studies in D. pulex. The WTN6 strain switches from producing females to producing males in response to the shortened day condition, while the MFP strain only produces females, irrespective of day-length. To clarify whether MF has a novel physiological role as a sex-determining factor in D. pulex, we demonstrate that a MF/JH biosynthesis inhibitor suppressed male production in WTN6 strain reared under the male-inducible condition, shortened day-length. Moreover, we show that juvenile hormone acid O-methyltransferase (JHAMT), a critical enzyme of MF/JH biosynthesis, displays MF-generating activity by catalyzing farnesoic acid. Expression of the JHAMT gene increased significantly just before the MF-sensitive period for male production in the WTN6 strain, but not in the MFP strain, when maintained under male-inducible conditions. These results suggest that MF synthesis regulated by JHAMT is necessary for male offspring production in D. pulex. Our findings provide novel insights into the genetic underpinnings of ESD and they begin to shed light on the physiological function of MF as a male-fate determiner in D. pulex.
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Affiliation(s)
- Kenji Toyota
- Department of Basic Biology, Faculty of Life Science, Graduate University for Advanced Studies (SOKENDAI), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan; Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, and National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan
| | - Hitoshi Miyakawa
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, and National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan
| | - Chizue Hiruta
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, and National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan; Department of Biology, Center for Liberal Arts and Sciences, Iwate Medical University, 2-1-1, Nishi-Tokuda, Yahaba-cho, Shiwa-gun, Iwate 028-3694, Japan
| | - Kenjiro Furuta
- Department of Life Science and Biotechnology, Faculty of Life and Environmental Science, Shimane University, Matsue, Shimane 690-8504, Japan
| | - Yukiko Ogino
- Department of Basic Biology, Faculty of Life Science, Graduate University for Advanced Studies (SOKENDAI), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan; Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, and National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan
| | - Tetsuro Shinoda
- National Institute of Agrobiological Sciences, 1-2, Oowashi, Tsukuba, Ibaraki 305-8634, Japan
| | - Norihisa Tatarazako
- National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
| | - Shinichi Miyagawa
- Department of Basic Biology, Faculty of Life Science, Graduate University for Advanced Studies (SOKENDAI), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan; Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, and National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan
| | - Joseph R Shaw
- School of Public and Environmental Affairs, Indiana University, 1315 East Tenth Street, Bloomington, IN 47405, USA; School of Biosciences, University of Birmingham, Birmingham B15 2TT, UK
| | - Taisen Iguchi
- Department of Basic Biology, Faculty of Life Science, Graduate University for Advanced Studies (SOKENDAI), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan; Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, and National Institutes of Natural Sciences, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan.
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Nakamura A, Tamura I, Takanobu H, Yamamuro M, Iguchi T, Tatarazako N. Fish multigeneration test with preliminary short-term reproduction assay for estrone using Japanese medaka (Oryzias latipes). J Appl Toxicol 2015; 35:11-3. [PMID: 25580481 DOI: 10.1002/jat.2981] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The most potent chemicals potentially causing adverse effects on fish species are estrogens in human waste.Sewage is a source of these estrogens and it is difficult to reduce. In particular, although the bioactivity of estrone is estimated to be about half of that of estradiol, multiple studies report that more than 100 ng l(–1) of estrone can be detected in urban rivers, including discharges from sewage treatment works; approximately two times as high as estradiol. Few studies have been conducted to investigate the long-term effects of estrone on wildlife; therefore, we conducted fish multigeneration test using Japanese medaka (Oryzias latipes). Medaka were exposed to estrone for 27 weeks across three generations in environmentally relevant concentrations, being 5.74, 11.4, 24.0, 47.1 and 91.4 ng l(–1). No effects on reproduction were observed in the first generation; however, a decline in egg production and fertility was observed in the second generation exposed to 91.4 ng l(–1) estrone, which is lower than some known environmental concentrations in urban environments. Furthermore, histopathological abnormalities were observed in the third generation exposed to both 47.1 and 91.4 ng l(–1), suggesting that estrone possibly exerts severe effects on the third or later generations. However, appearances of testis–ova were observed in the second and third generation they were not consistent with actual effects on reproduction, notwithstanding the testis-ovais regarded as the key evidence for endocrine disruption. Accordingly, we consider that qualitative measurement of abnormalities using histopathological observations is required for appropriate evaluation of endocrine disruption.
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Tohyama S, Miyagawa S, Lange A, Ogino Y, Mizutani T, Tatarazako N, Katsu Y, Ihara M, Tanaka H, Ishibashi H, Kobayashi T, Tyler CR, Iguchi T. Understanding the molecular basis for differences in responses of fish estrogen receptor subtypes to environmental estrogens. Environ Sci Technol 2015; 49:7439-7447. [PMID: 26032098 DOI: 10.1021/acs.est.5b00704] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Exposure to endocrine disrupting chemicals (EDCs) can elicit adverse effects on development, sexual differentiation, and reproduction in fish. Teleost species exhibit at least three subtypes of estrogen receptor (ESR), ESR1, ESR2a, and ESR2b; thus, estrogenic signaling pathways are complex. We applied in vitro reporter gene assays for ESRs in five fish species to investigate the ESR subtype-specificity for better understanding the signaling pathway of estrogenic EDCs. Responses to bisphenol A, 4-nonylphenol, and o,p'-DDT varied among ESR subtypes, and the response pattern of ESRs was basically common among the different fish species. Using a computational in silico docking model and through assays quantifying transactivation of the LBD (using GAL-LBD fusion proteins and chimera proteins for the ESR2s), we found that the LBD of the different ESR subtypes generally plays a key role in conferring responsiveness of the ESR subtypes to EDCs. These results also indicate that responses of ESR2s to EDCs cannot necessarily be predicted from the LBD sequence alone, and an additional region is required for full transactivation of these receptors. Our data thus provide advancing understanding on receptor functioning for both basic and applied research.
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Affiliation(s)
- Saki Tohyama
- †Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka, Shizuoka 422-8526, Japan
- ‡Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
| | - Shinichi Miyagawa
- ‡Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
| | | | - Yukiko Ogino
- ‡Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
| | - Takeshi Mizutani
- ‡Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
| | - Norihisa Tatarazako
- ∥Center for Environmental Risk Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, Japan
| | - Yoshinao Katsu
- ⊥Department of Biological Sciences, Hokkaido University, Sapporo 060-0810, Japan
| | - Masaru Ihara
- #Research Center for Environmental Quality Management, Kyoto University, Otsu, Shiga 520-0811, Japan
| | - Hiroaki Tanaka
- #Research Center for Environmental Quality Management, Kyoto University, Otsu, Shiga 520-0811, Japan
| | - Hiroshi Ishibashi
- ∇Department of Life Environmental Conservation, Faculty of Agriculture, Ehime University, Matsuyama, Ehime 790-8566, Japan
| | - Tohru Kobayashi
- †Graduate School of Integrated Pharmaceutical and Nutritional Sciences, University of Shizuoka, Shizuoka 422-8526, Japan
| | | | - Taisen Iguchi
- ‡Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
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Zhou S, Watanabe H, Wei C, Wang D, Zhou J, Tatarazako N, Masunaga S, Zhang Y. Reduction in toxicity of coking wastewater to aquatic organisms by vertical tubular biological reactor. Ecotoxicol Environ Saf 2015; 115:217-222. [PMID: 25706086 DOI: 10.1016/j.ecoenv.2015.02.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 02/08/2015] [Accepted: 02/09/2015] [Indexed: 06/04/2023]
Abstract
We conducted a battery of toxicity tests using photo bacterium, algae, crustacean and fish to evaluate acute toxicity profile of coking wastewater, and to evaluate the performance of a novel wastewater treatment process, vertical tubular biological reactor (VTBR), in the removal of toxicity and certain chemical pollutants. A laboratory scale VTBR system was set up to treat industrial coking wastewater, and investigated both chemicals removal efficiency and acute bio-toxicity to aquatic organisms. The results showed that chemical oxygen demand (COD) and phenol reductions by VTBR were approximately 93% and 100%, respectively. VTBR also reduced the acute toxicity of coking wastewater significantly: Toxicity Unit (TU) decreased from 21.2 to 0.4 for Photobacterium phosphoreum, from 9.5 to 0.6 for Isochrysis galbana, from 31.9 to 1.3 for Daphnia magna, and from 30.0 to nearly 0 for Danio rerio. VTBR is an efficient treatment method for the removal of chemical pollutants and acute bio-toxicity from coking wastewater.
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Affiliation(s)
- Siyun Zhou
- Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Haruna Watanabe
- National Institute for Environmental Studies, Endocrine Disrupters and Dioxin Research Project, 16-2 Onogawa, Tsukuba, Ibaraki 304-8506, Japan
| | - Chang Wei
- Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Dongzhou Wang
- Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Jiti Zhou
- Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Norihisa Tatarazako
- National Institute for Environmental Studies, Endocrine Disrupters and Dioxin Research Project, 16-2 Onogawa, Tsukuba, Ibaraki 304-8506, Japan
| | - Shigeki Masunaga
- Faculty of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan
| | - Ying Zhang
- Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
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Terasaki M, Abe R, Makino M, Tatarazako N. Chronic toxicity of parabens and their chlorinated by-products in Ceriodaphnia dubia. Environ Toxicol 2015; 30:664-73. [PMID: 24376163 DOI: 10.1002/tox.21944] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Revised: 12/06/2013] [Accepted: 12/12/2013] [Indexed: 05/06/2023]
Abstract
The chronic toxicity of 12 compounds of parabens and their chlorinated by-products was investigated using 7-day Ceriodaphnia dubia test under static renewal condition in order to generate information on how to disinfect by-products of preservatives that are discharged in aquatic systems. The mortality and inhibition of reproduction tended to increase with increasing hydrophobicity and decreased with the degree of chlorination of parabens. The EC50 values for mortality, offspring number, and first brood production ranged between 0.30-3.1, 0.047-12, and 1.3-6.3 mg L(-1) , respectively. For the number of neonates, the most sensitive endpoint, the no-observed-effect concentration (NOEC) and lowest-observed-effect concentration (LOEC) values ranged from 0.63 to 10 mg L(-1) and from 1.2 to 19 mg L(-1) , respectively. Methylparaben (MP), benzylparaben (BnP), and dichlorinated BnP (Cl2 BnP) elicited a significant decrease in offspring numbers even at their lowest concentration tested; the NOEC for these compounds was determined to be less than the lowest test concentration (1.3, 0.04, and 0.63 mg L(-1) for MP, BnP, and Cl2 BnP, respectively). Propylparaben (PP), chlorinated PP, isopropylparaben (iPP), and chlorinated iPP exhibited nonmonotonic concentration-dependent response; their NOEC and LOEC values could not be determined. The multivariate approach involving principal component analysis and hierarchical cluster analysis revealed four groups that corresponded to the toxicological profiles of parabens. Our results suggested that disinfection of parabens by chlorination could reduce aquatic toxicity of original compounds. The findings obtained in our study together with the data available on paraben concentrations in aquatic systems can be used to perform preliminary risk assessment by comparing the predicted environmental concentration (PEC) with the predicted no-effect concentration (PNEC) for the marine aquatic environment. The calculated PEC/PNEC ratios ranged from 0.0012 to 0.2, with the highest value observed in MP. This suggested that there are negligible environmental risks for aquatic organisms at current use levels.
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Affiliation(s)
- Masanori Terasaki
- Institute for Environmental Sciences, University of Shizuoka, Yada 52-1, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Ryoko Abe
- Research Center for Environmental Risk, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
| | - Masakazu Makino
- Institute for Environmental Sciences, University of Shizuoka, Yada 52-1, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Norihisa Tatarazako
- Research Center for Environmental Risk, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan
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Toyota K, Miyakawa H, Yamaguchi K, Shigenobu S, Ogino Y, Tatarazako N, Miyagawa S, Iguchi T. NMDA receptor activation upstream of methyl farnesoate signaling for short day-induced male offspring production in the water flea, Daphnia pulex. BMC Genomics 2015; 16:186. [PMID: 25867484 PMCID: PMC4372037 DOI: 10.1186/s12864-015-1392-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Accepted: 02/24/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The cladoceran crustacean Daphnia pulex produces female offspring by parthenogenesis under favorable conditions, but in response to various unfavorable external stimuli, it produces male offspring (environmental sex determination: ESD). We recently established an innovative system for ESD studies using D. pulex WTN6 strain, in which the sex of the offspring can be controlled simply by changes in the photoperiod: the long-day and short-day conditions can induce female and male offspring, respectively. Taking advantage of this system, we demonstrated that de novo methyl farnesoate (MF) synthesis is necessary for male offspring production. These results indicate the key role of innate MF signaling as a conductor between external environmental stimuli and the endogenous male developmental pathway. Despite these findings, the molecular mechanisms underlying up- and downstream signaling of MF have not yet been well elucidated in D. pulex. RESULTS To elucidate up- and downstream events of MF signaling during sex determination processes, we compared the transcriptomes of daphnids reared under the long-day (female) condition with short-day (male) and MF-treated (male) conditions. We found that genes involved in ionotropic glutamate receptors, known to mediate the vast majority of excitatory neurotransmitting processes in various organisms, were significantly activated in daphnids by the short-day condition but not by MF treatment. Administration of specific agonists and antagonists, especially for the N-methyl-D-aspartic acid (NMDA) receptor, strongly increased or decreased, respectively, the proportion of male-producing mothers. Moreover, we also identified genes responsible for male production (e.g., protein kinase C pathway-related genes). Such genes were generally shared between the short-day reared and MF-treated daphnids. CONCLUSIONS We identified several candidate genes regulating ESD which strongly suggests that these genes may be essential factors for male offspring production as an upstream regulator of MF signaling in D. pulex. This study provides new insight into the fundamental mechanisms underlying how living organisms alter their phenotypes in response to various external environments.
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Affiliation(s)
- Kenji Toyota
- />Department of Basic Biology, Faculty of Life Science, SOKENDAI (The Graduate University for Advanced Studies), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan
- />National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585 Japan
- />Okazaki Institute for Integrative Bioscience, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan
| | - Hitoshi Miyakawa
- />National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585 Japan
- />Okazaki Institute for Integrative Bioscience, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan
| | - Katsushi Yamaguchi
- />National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585 Japan
| | - Shuji Shigenobu
- />Department of Basic Biology, Faculty of Life Science, SOKENDAI (The Graduate University for Advanced Studies), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan
- />National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585 Japan
| | - Yukiko Ogino
- />Department of Basic Biology, Faculty of Life Science, SOKENDAI (The Graduate University for Advanced Studies), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan
- />National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585 Japan
- />Okazaki Institute for Integrative Bioscience, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan
| | - Norihisa Tatarazako
- />National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506 Japan
| | - Shinichi Miyagawa
- />Department of Basic Biology, Faculty of Life Science, SOKENDAI (The Graduate University for Advanced Studies), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan
- />National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585 Japan
- />Okazaki Institute for Integrative Bioscience, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan
| | - Taisen Iguchi
- />Department of Basic Biology, Faculty of Life Science, SOKENDAI (The Graduate University for Advanced Studies), 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan
- />National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki, Aichi 444-8585 Japan
- />Okazaki Institute for Integrative Bioscience, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787 Japan
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Abe R, Toyota K, Miyakawa H, Watanabe H, Oka T, Miyagawa S, Nishide H, Uchiyama I, Tollefsen KE, Iguchi T, Tatarazako N. Diofenolan induces male offspring production through binding to the juvenile hormone receptor in Daphnia magna. Aquat Toxicol 2015; 159:44-51. [PMID: 25506888 DOI: 10.1016/j.aquatox.2014.11.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 11/12/2014] [Accepted: 11/18/2014] [Indexed: 06/04/2023]
Abstract
Juvenile hormone (JH) and JH agonists have been reported to induce male offspring production in various daphnid species including Daphnia magna. We recently established a short-term in vivo screening assay to detect chemicals having male offspring induction activity in adult D. magna. Diofenolan has been developed as a JH agonist for insect pest control, but its male offspring induction activity in daphnids has not been investigated yet. In this study, we found that the insect growth regulator (IGR) diofenolan exhibited a potent male offspring induction activity at low ng/L to μg/L concentrations, as demonstrated by the short-term in vivo screening assay and the recently developed TG211 ANNEX 7 test protocol. A two-hybrid assay performed using the D. magna JH receptor confirmed that diofenolan had a strong JH activity. Global whole body transcriptome analysis of D. magna exposed to 10 ng/L diofenolan showed an up-regulation of JH-responsive genes and modulation of several genes involved in the ecdysone receptor signaling pathway. These results clearly demonstrate that diofenolan has strong JH activity and male offspring induction activity, and that a combination of modified standardized regulatory testing protocols and rapid in vitro and in vivo screening assays are able to identify potential endocrine disruptors in D. magna. The observation that diofenolan modulates multiple endocrine signaling pathways in D. magna suggests that further investigation of potential interference with growth, development and reproduction is warranted.
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Affiliation(s)
- Ryoko Abe
- Environmental Quality Measurement Section, Research Center for Environmental Risk, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Ibaraki, Japan
| | - Kenji Toyota
- Department of Basic Biology, Faculty of Life Science, Graduate University for Advanced Studies (SOKENDAI), 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Aichi, Japan; Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Japan
| | - Hitoshi Miyakawa
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Japan
| | - Haruna Watanabe
- Environmental Quality Measurement Section, Research Center for Environmental Risk, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Ibaraki, Japan
| | - Tomohiro Oka
- Japan Environmental Management Association for Industry, 2-2-1 Kajicho, Chiyoda-ku, Tokyo 101-0044, Japan
| | - Shinichi Miyagawa
- Department of Basic Biology, Faculty of Life Science, Graduate University for Advanced Studies (SOKENDAI), 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Aichi, Japan; Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Japan
| | - Hiroyo Nishide
- Data Integration and Analysis Facility, National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki 444-8585, Aichi, Japan
| | - Ikuo Uchiyama
- Data Integration and Analysis Facility, National Institute for Basic Biology, 38 Nishigonaka, Myodaiji, Okazaki 444-8585, Aichi, Japan
| | - Knut Erik Tollefsen
- Norwegian Institute for Water Research (NIVA), Gaustadallèen 21, N-0349 Oslo, Norway
| | - Taisen Iguchi
- Department of Basic Biology, Faculty of Life Science, Graduate University for Advanced Studies (SOKENDAI), 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Aichi, Japan; Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), 5-1 Higashiyama, Myodaiji, Okazaki 444-8787, Japan
| | - Norihisa Tatarazako
- Environmental Quality Measurement Section, Research Center for Environmental Risk, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Ibaraki, Japan.
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Okamoto A, Yamamuro M, Tatarazako N. Acute toxicity of 50 metals to Daphnia magna. J Appl Toxicol 2014; 35:824-30. [PMID: 25382633 DOI: 10.1002/jat.3078] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Revised: 09/07/2014] [Accepted: 09/07/2014] [Indexed: 11/09/2022]
Abstract
Metals are essential for human life and physiological functions but may sometimes cause disorders. Therefore, we conducted acute toxicity testing of 50 metals in Daphnia magna: EC50s of seven elements (Be, Cu, Ag, Cd, Os, Au and Hg) were < 100 µg l(-1) ; EC50s of 13 elements (Al, Sc, Cr, Co, Ni, Zn, Se, Rb, Y, Rh, Pt, Tl and Pb) were between 100 and 1000 µg l(-1) ; EC50s of 14 elements (Li, V, Mn, Fe, Ge, As, In, Sn, Sb, Te, Cs, Ba, W and Ir) were between 1,001 and 100,000 µg l(-1) ; EC50s of six elements (Na, Mg, K, Ca, Sr and Mo) were > 100,000 µg l(-1) ; and. 7 elements (Ti, Zr, Bi, Nb, Hf, Re and Ta) did not show EC50 at the upper limit of respective aqueous solubility, and EC50s were not obtained. Ga, Ru and Pd adhered to the body of D. magna and physically retarded the movement of D. magna. These metals formed hydroxides after adjusting the pH. Therefore, here, we distinguished this physical effect from the physiological toxic effect. The acute toxicity results of 40 elements obtained in this study were not correlated with electronegativity. Similarly, the acute toxicity results of metals including the rare metals were also not correlated with first ionization energy, atomic weight, atomic number, covalent radius, atomic radius or ionic radius.
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Affiliation(s)
- Akira Okamoto
- Graduate School of Frontier Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan
| | - Masumi Yamamuro
- Graduate School of Frontier Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan
| | - Norihisa Tatarazako
- Graduate School of Frontier Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan.,Environmental Quality Measurement Section, Research Center for Environmental Risk, National Institute for Environmental Studies, 16-2 Ogawa, Tsukuba, Ibaraki, 305-8506, Japan
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Miyagawa S, Lange A, Tohyama S, Ogino Y, Mizutani T, Kobayashi T, Tatarazako N, Tyler CR, Iguchi T. Characterization ofOryzias latipesglucocorticoid receptors and their unique response to progestins. J Appl Toxicol 2014; 35:302-9. [DOI: 10.1002/jat.3020] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 03/21/2014] [Accepted: 03/21/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Shinichi Miyagawa
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology; The Graduate University for Advanced Studies (SOKENDAI); Okazaki Aichi 444-8787 Japan
| | - Anke Lange
- Biosciences, College of Life and Environmental Sciences; University of Exeter; Stocker Road Exeter EX4 4QD UK
| | - Saki Tohyama
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology; The Graduate University for Advanced Studies (SOKENDAI); Okazaki Aichi 444-8787 Japan
- Graduate School of Nutritional and Environmental Sciences; University of Shizuoka; Shizuoka 422-8526 Japan
| | - Yukiko Ogino
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology; The Graduate University for Advanced Studies (SOKENDAI); Okazaki Aichi 444-8787 Japan
| | - Takeshi Mizutani
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology; The Graduate University for Advanced Studies (SOKENDAI); Okazaki Aichi 444-8787 Japan
| | - Tohru Kobayashi
- Graduate School of Nutritional and Environmental Sciences; University of Shizuoka; Shizuoka 422-8526 Japan
| | - Norihisa Tatarazako
- Environmental Quality Measurement Section, Research Center for Environmental Risk; National Institute for Environmental Studies; 16-2 Onogawa Tsukuba Ibaraki 305-8506 Japan
| | - Charles R. Tyler
- Biosciences, College of Life and Environmental Sciences; University of Exeter; Stocker Road Exeter EX4 4QD UK
| | - Taisen Iguchi
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology; The Graduate University for Advanced Studies (SOKENDAI); Okazaki Aichi 444-8787 Japan
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Miyagawa S, Lange A, Hirakawa I, Tohyama S, Ogino Y, Mizutani T, Kagami Y, Kusano T, Ihara M, Tanaka H, Tatarazako N, Ohta Y, Katsu Y, Tyler CR, Iguchi T. Differing species responsiveness of estrogenic contaminants in fish is conferred by the ligand binding domain of the estrogen receptor. Environ Sci Technol 2014; 48:5254-63. [PMID: 24689804 DOI: 10.1021/es5002659] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Exposure to estrogenic endocrine disrupting chemicals (EDCs) induces a range of adverse effects, notably on reproduction and reproductive development. These responses are mediated via estrogen receptors (ERs). Different species of fish may show differences in their responsiveness to environmental estrogens but there is very limited understanding on the underlying mechanisms accounting for these differences. We used custom developed in vitro ERα reporter gene assays for nine fish species to analyze the ligand- and species-specificity for 12 environmental estrogens. Transcriptonal activities mediated by estradiol-17β (E2) were similar to only a 3-fold difference in ERα sensitivity between species. Diethylstilbestrol was the most potent estrogen (∼ 10-fold that of E2) in transactivating the fish ERαs, whereas equilin was about 1 order of magnitude less potent in all species compared to E2. Responses of the different fish ERαs to weaker environmental estrogens varied, and for some considerably. Medaka, stickleback, bluegill and guppy showed higher sensitivities to nonylphenol, octylphenol, bisphenol A and the DDT-metabolites compared with cyprinid ERαs. Triclosan had little or no transactivation of the fish ERαs. By constructing ERα chimeras in which the AF-containing domains were swapped between various fish species with contrasting responsiveness and subsequent exposure to different environmental estrogens. Our in vitro data indicate that the LBD plays a significant role in accounting for ligand sensitivity of ERα in different species. The differences seen in responsiveness to different estrogenic chemicals between species indicate environmental risk assessment for estrogens cannot necessarily be predicted for all fish by simply examining receptor activation for a few model fish species.
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Affiliation(s)
- Shinichi Miyagawa
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, National Institutes of Natural Sciences, and Department of Basic Biology, The Graduate School for Advanced Studies (SOKENDAI) , Okazaki, Aichi 444-8787, Japan
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