1
|
Dong Z, Chen Y, Li X, Zhang N, Guo Y, Liang YQ, Wang Z. Norethindrone alters growth, sex differentiation and gene expression in marine medaka (Oryzias melastigma). ENVIRONMENTAL TOXICOLOGY 2022; 37:1211-1221. [PMID: 35098644 DOI: 10.1002/tox.23477] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Revised: 12/27/2021] [Accepted: 01/16/2022] [Indexed: 06/14/2023]
Abstract
Norethindrone (NET) is a widely used synthetic progestin, which appears in water environments and threatens aquatic organisms. In this study, marine medaka (Oryzias melastigma) larvae were exposed to 7.6 and 80.1 ng/L NET for 190 days. The effects of NET on growth, sex differentiation, gonad histology and transcriptional expression profiles of hypothalamic-pituitary-gonadal (HPG) axis-related genes were determined. The results showed that exposure to 80.1 ng/L NET caused an all-male marine medaka population and significantly decreased the growth of males. Exposure to 7.6 ng/L NET increased the ratio of males/females in the marine medaka population, decreased the growth of males and delayed the ovary maturation in females. However, the sperm maturation was accelerated by 7.6 or 80.1 ng/L NET. In females, the transcription levels of cytochrome P450 aromatase (cyp19a1a) and progesterone receptor (pgr) in ovaries, glucocorticoid receptor (gr) and vitellogenin (vtg) in livers were suppressed after exposure to 7.6 ng/L NET, which may cause delayed ovary maturation. In males, NET significantly decreased the transcription levels of follicle stimulating hormone β (fshβ) and Luteinizing hormone β (lhβ)in the brain, Estrogen receptor β (erβ),gr and pgr in the liver, and vitellogenin receptor (vtgr) in the testes, while NET of 80.1 ng/L led to a significant up-regulation of steroidogenic acute regulatory protein (star) in the testes of males. These results showed that NET could influence growth, sex differentiation and gonadal maturation and significantly alter the transcriptional expression levels of HPG axis-related genes.
Collapse
Affiliation(s)
- Zhongdian Dong
- Key Laboratory of Aquaculture in South China Sea for Aquatic Economic Animal of Guangdong Higher Education Institutes, College of Fishery, Guangdong Ocean University, Zhanjiang, China
- Guangdong Provincial Key Laboratory of Pathogenic Biology and Epidemiology for Aquatic Economic Animals, College of Fishery, Guangdong Ocean University, Zhanjiang, China
| | - Yuebi Chen
- Key Laboratory of Aquaculture in South China Sea for Aquatic Economic Animal of Guangdong Higher Education Institutes, College of Fishery, Guangdong Ocean University, Zhanjiang, China
| | - Xueyou Li
- Key Laboratory of Aquaculture in South China Sea for Aquatic Economic Animal of Guangdong Higher Education Institutes, College of Fishery, Guangdong Ocean University, Zhanjiang, China
| | - Ning Zhang
- Key Laboratory of Aquaculture in South China Sea for Aquatic Economic Animal of Guangdong Higher Education Institutes, College of Fishery, Guangdong Ocean University, Zhanjiang, China
| | - Yusong Guo
- Key Laboratory of Aquaculture in South China Sea for Aquatic Economic Animal of Guangdong Higher Education Institutes, College of Fishery, Guangdong Ocean University, Zhanjiang, China
| | - Yan-Qiu Liang
- Faculty of Chemistry and Environmental Science, Guangdong Ocean University, Zhanjiang, China
| | - Zhongduo Wang
- Key Laboratory of Aquaculture in South China Sea for Aquatic Economic Animal of Guangdong Higher Education Institutes, College of Fishery, Guangdong Ocean University, Zhanjiang, China
- State Laboratory of Developmental Biology of Freshwater Fish, College of Life Sciences, Hunan Normal University School, Changsha, China
| |
Collapse
|
2
|
Chowdhury K, Lin S, Lai SL. Comparative Study in Zebrafish and Medaka Unravels the Mechanisms of Tissue Regeneration. Front Ecol Evol 2022. [DOI: 10.3389/fevo.2022.783818] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Tissue regeneration has been in the spotlight of research for its fascinating nature and potential applications in human diseases. The trait of regenerative capacity occurs diversely across species and tissue contexts, while it seems to decline over evolution. Organisms with variable regenerative capacity are usually distinct in phylogeny, anatomy, and physiology. This phenomenon hinders the feasibility of studying tissue regeneration by directly comparing regenerative with non-regenerative animals, such as zebrafish (Danio rerio) and mice (Mus musculus). Medaka (Oryzias latipes) is a fish model with a complete reference genome and shares a common ancestor with zebrafish approximately 110–200 million years ago (compared to 650 million years with mice). Medaka shares similar features with zebrafish, including size, diet, organ system, gross anatomy, and living environment. However, while zebrafish regenerate almost every organ upon experimental injury, medaka shows uneven regenerative capacity. Their common and distinct biological features make them a unique platform for reciprocal analyses to understand the mechanisms of tissue regeneration. Here we summarize current knowledge about tissue regeneration in these fish models in terms of injured tissues, repairing mechanisms, available materials, and established technologies. We further highlight the concept of inter-species and inter-organ comparisons, which may reveal mechanistic insights and hint at therapeutic strategies for human diseases.
Collapse
|
3
|
Mushirobira Y, Kamegai K, Amagai T, Murata R, Nagae M, Soyano K. Expression profiles of hepatic vitellogenin and gonadal zona pellucida subtypes in gray mullet (Mugil cephalus) with 17α-ethinylestradiol-induced gonadal abnormality. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2021; 237:105863. [PMID: 34082271 DOI: 10.1016/j.aquatox.2021.105863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 05/06/2021] [Accepted: 05/07/2021] [Indexed: 06/12/2023]
Abstract
The subtypes of zona pellucida (zp), primarily expressed in female gonads, are considered novel molecular markers for testis-ova (or intersex), a type of gonadal abnormality caused by environmental estrogens (EEs) in Japanese medaka (Oryzias latipes). However, the association between testis-ova and the expression of gonadal zp subtypes is unclear in other teleost species, particularly in species studied in field surveys. In this study, 17α-ethinylestradiol (EE2) was orally administrated at 4-4000 ng/g body weight (BW)/day for 28 days to gray mullets (Mugil cephalus), and gonadal abnormalities were studied using histological analysis. The expression profiles of gonadal zp subtypes (zpb and zpc5) were analyzed to evaluate their suitability as gonadal abnormality markers by comparing with a hepatic vitellogenin (vtg) subtype (vtgAb). The oral administration of EE2 40 and 400 ng/g BW/day for 28 days induced significant gonadal zpb expression, and the gonads showed moderate abnormality (testis-ova). Conversely, the gonadal zpc5 levels decreased significantly in response to the oral administration of EE2 at 4000 ng/g BW/day for 28 days, and the gonads exhibited severe abnormalities. The hepatic vtgAb levels increased upon EE2 treatment regardless of gonadal abnormality. Therefore, the gonadal zpb levels and hepatic vtgAb levels served as appropriate markers for testis-ova and EE2 presence, respectively. However, the diagnosis of severe gonadal abnormality using gonadal zpc5 was moderately accurate. The findings suggest that the combination of vtgAb, zpb, and zpc5 is a potential marker for gonadal abnormality caused by EE contamination in gray mullet. That said, the potential of zpc5 should be reconsidered to determine if it shows greater accuracy in a larger or more diverse population.
Collapse
Affiliation(s)
- Yuji Mushirobira
- Institute for East China Sea Research, Organization for Marine Science and Technology, Nagasaki University, 1551-7, Taira-machi, Nagasaki 851-2213, Nagasaki, Japan.
| | - Kohei Kamegai
- Institute for East China Sea Research, Organization for Marine Science and Technology, Nagasaki University, 1551-7, Taira-machi, Nagasaki 851-2213, Nagasaki, Japan; Graduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14, Bunkyo-machi, Nagasaki 852-8521, Nagasaki, Japan
| | - Takafumi Amagai
- Institute for East China Sea Research, Organization for Marine Science and Technology, Nagasaki University, 1551-7, Taira-machi, Nagasaki 851-2213, Nagasaki, Japan; Graduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14, Bunkyo-machi, Nagasaki 852-8521, Nagasaki, Japan
| | - Ryosuke Murata
- Institute for East China Sea Research, Organization for Marine Science and Technology, Nagasaki University, 1551-7, Taira-machi, Nagasaki 851-2213, Nagasaki, Japan
| | - Masaki Nagae
- Graduate School of Fisheries and Environmental Sciences, Nagasaki University, 1-14, Bunkyo-machi, Nagasaki 852-8521, Nagasaki, Japan
| | - Kiyoshi Soyano
- Institute for East China Sea Research, Organization for Marine Science and Technology, Nagasaki University, 1551-7, Taira-machi, Nagasaki 851-2213, Nagasaki, Japan.
| |
Collapse
|
4
|
Chen X, Cheng SH, Kinoshita M, de Witte PA, Liu J, Hinton D, Braunbeck T, Cotgreave I, Schlenk D, Gong Z, El-Nezami H, Ho KC, Chan KF, Xu S, Yiu PY, Zhang H, Wu D, Chan YS, Ny A, Maes J. Pre-validation of choriogenin H transgenic medaka eleutheroembryos as a quantitative estrogenic activity test method. Anal Biochem 2021; 629:114311. [PMID: 34302800 DOI: 10.1016/j.ab.2021.114311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Revised: 06/23/2021] [Accepted: 07/18/2021] [Indexed: 11/16/2022]
Abstract
The choriogenin H - EGFP transgenic medaka (Oryzias melastigma) has been used to test estrogenic substances and quantify estrogenic activity into 17β-estradiol (E2) equivalency (EEQ). The method uses 8 eleutheroembryos in 2 ml solution per well and 3 wells per treatment in 24-well plates at 26 ± 1 °C for 24 ± 2 h, with subsequent measurements of induced GFP signal intensity. EEQ measurements are calculated using a E2 probit regression model with a coefficient of determination (R2) > 0.90. The selectivity was confirmed evaluating 27 known estrogenic and 5 known non-estrogenic compounds. Limit of quantitation (LOQ), recovery rate and bias were calculated to be 1 ng/ml EEQ, 104% and 4% respectively. Robustness analysis revealed exposure temperature is a sensitive parameter that should be kept at 26 ± 1 °C. The repeatability of intra- and inter-laboratories achieved CV < 30% for most tested food and cosmetics samples. The lot-lot stability was confirmed by the stable EEQ qualitative control (QC, 1 ng/mL E2) and calibration curve results. The stability of standard reagents, samples and sample extracts was also investigated. These data demonstrated this method to be an accurate indicator of estrogenic activity for both chemicals and extracts.
Collapse
Affiliation(s)
- Xueping Chen
- Vitargent (International) Biotechnology Limited, Unit 516, Biotech Centre 2, 11 Science Park West Avenue, Hong Kong Science Park, Hong Kong SAR, 999077, China.
| | - Shuk Han Cheng
- College of Veterinary Medicine and Life Science, City University of Hong Kong, Hong Kong SAR, 999077, China.
| | - Masato Kinoshita
- Division of Applied Bioscience, Graduate School of Agriculture, Kyoto University, Kyoto, Japan.
| | - Peter A de Witte
- Laboratory for Molecular Biodiscovery, Department of Pharmaceutical and Pharmacological Sciences, University of Leuven, O & N II Herestraat 49-Box 824, 3000, Leuven, Belgium.
| | - Jianjun Liu
- Key Laboratory of Modern Toxicology of Shenzhen, Medical Key Laboratory of Health Toxicology, Laboratory of Modern Toxicology, Shenzhen Centre for Disease Control and Prevention, Shenzhen, 518060, China.
| | - David Hinton
- Nicholas School of the Environment, Duke University, A333a LSRC, Durham, NC, 27708, United States.
| | - Thomas Braunbeck
- Aquatic Ecology and Toxicology, Center for Organismal Studies, Heidelberg University, Im Neuenheimer Feld 504, D-69120, Heidelberg, Germany.
| | - Ian Cotgreave
- RISE, Research Institutes of Sweden, Unit of Chemical and Pharmaceutical Safety, Division of Bioeconomy and Health, S-15134, Södertälje, Sweden.
| | - Daniel Schlenk
- Department of Environmental Sciences, University of California, Riverside, CA, 92521, United States.
| | - Zhiyuan Gong
- Department of Biological Sciences, National University of Singapore, Singapore.
| | - Hani El-Nezami
- School of Biological Sciences, Faculty of Science, The University of Hong Kong, Hong Kong SAR, 999077, China.
| | - Kin Chung Ho
- College of Marine Ecology and Environment, Shanghai Ocean University, China.
| | - Kwok Fai Chan
- Vitargent (International) Biotechnology Limited, Unit 516, Biotech Centre 2, 11 Science Park West Avenue, Hong Kong Science Park, Hong Kong SAR, 999077, China.
| | - Shisan Xu
- Vitargent (International) Biotechnology Limited, Unit 516, Biotech Centre 2, 11 Science Park West Avenue, Hong Kong Science Park, Hong Kong SAR, 999077, China.
| | - Pui Ying Yiu
- Vitargent (International) Biotechnology Limited, Unit 516, Biotech Centre 2, 11 Science Park West Avenue, Hong Kong Science Park, Hong Kong SAR, 999077, China.
| | - Huan Zhang
- Vitargent (International) Biotechnology Limited, Unit 516, Biotech Centre 2, 11 Science Park West Avenue, Hong Kong Science Park, Hong Kong SAR, 999077, China.
| | - Desheng Wu
- Key Laboratory of Modern Toxicology of Shenzhen, Medical Key Laboratory of Health Toxicology, Laboratory of Modern Toxicology, Shenzhen Centre for Disease Control and Prevention, Shenzhen, 518060, China.
| | - Yu Suen Chan
- College of Veterinary Medicine and Life Science, City University of Hong Kong, Hong Kong SAR, 999077, China.
| | - Annelii Ny
- Laboratory for Molecular Biodiscovery, Department of Pharmaceutical and Pharmacological Sciences, University of Leuven, O & N II Herestraat 49-Box 824, 3000, Leuven, Belgium.
| | - Jan Maes
- Laboratory for Molecular Biodiscovery, Department of Pharmaceutical and Pharmacological Sciences, University of Leuven, O & N II Herestraat 49-Box 824, 3000, Leuven, Belgium.
| |
Collapse
|
5
|
Peng X, Zhao L, Liu J, Guo X, Ding Y. Comparative transcriptome analyses of the liver between Xenocypris microlepis and Xenocypris davidi under low copper exposure. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2021; 236:105850. [PMID: 34022695 DOI: 10.1016/j.aquatox.2021.105850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 04/26/2021] [Accepted: 04/28/2021] [Indexed: 06/12/2023]
Abstract
Copper is one of the most ubiquitous environmental pollutants worldwide. Previous studies have focused on the toxicology of high copper exposure, while there has been comparatively less research on the biological effects of low copper exposure. Low concentrations of copper often exist in freshwater ecosystems, and its impact on the fish is unclear. Both Xenocypris microlepis and Xenocypris davidi are bottom-feeding fishes widely distributed in freshwater ecosystems of China, and they are more likely to be contaminated by low concentrations of copper. Low copper exposure may have effects on molecular regulation at the level of gene expression in the two Xenocypris species. To investigate gene expression differences involved in the response to low copper concentrations between X. microlepis and X. davidi, we established the responses to low copper exposure of 0.01 mg/L for 14 days at the transcriptional level, and RNA-Seq was used to perform a comparative transcriptomic analysis of the liver. A total of 74,135 and 60,894 unigenes from X. microlepis and X. davidi were assembled by transcriptome profiling, respectively. Among these, 84 genes of X. microlepis and 165 genes of X. davidi were identified as differentially expressed genes (DEGs). There were 60 and 135 up-regulated, 24 and 30 down-regulated genes in the two species, respectively. Comparative transcriptome analyses identified five differentially co-expressed genes (DCGs) related to low copper exposure from the DEGs of the two Xenocypris species. The five DCGs were related to the fishes' growth, antioxidant system, immune system and heavy metal tolerance. The results could help us to understand the molecular mechanisms of the response to low copper exposure, and the data should provide a valuable transcriptomic resource for the genus Xenocypris.
Collapse
Affiliation(s)
- Xinliang Peng
- Fisheries College, Guangdong Ocean University, Zhanjiang 524088, China; College of Fisheries, Xinyang Agriculture and Forestry University, Xinyang 464000, China
| | - Liangjie Zhao
- College of Fisheries, Xinyang Agriculture and Forestry University, Xinyang 464000, China; Fishery Biological Engineering Technology Research Center of Henan Province, Xinyang 464000, China
| | - Jun Liu
- College of Fisheries, Xinyang Agriculture and Forestry University, Xinyang 464000, China; Fishery Biological Engineering Technology Research Center of Henan Province, Xinyang 464000, China
| | - Xusheng Guo
- College of Fisheries, Xinyang Agriculture and Forestry University, Xinyang 464000, China; Fishery Biological Engineering Technology Research Center of Henan Province, Xinyang 464000, China.
| | - Yu Ding
- Fisheries College, Guangdong Ocean University, Zhanjiang 524088, China.
| |
Collapse
|
6
|
Ishibashi H, Uchida M, Temma Y, Hirano M, Tominaga N, Arizono K. Choriogenin transcription in medaka embryos and larvae as an alternative model for screening estrogenic endocrine-disrupting chemicals. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 193:110324. [PMID: 32088548 DOI: 10.1016/j.ecoenv.2020.110324] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 02/06/2020] [Accepted: 02/10/2020] [Indexed: 06/10/2023]
Abstract
This study assessed the transcription levels of estrogen-responsive genes, such as vitellogenins (Vtg1 and Vtg2), choriogenins (ChgL, ChgH, and ChgHm), cytochrome P450 aromatase (CYP19a1b), and ER subtypes (ERα, ERβ1, and ERβ2), in 7 days-post-fertilization (dpf) embryos and 9 and 12 dpf larvae of medaka (Oryzias latipes) exposed to estrogenic endocrine-disrupting chemicals (EDCs). The <5 h-post-fertilization embryos were exposed to EDCs such as 17β-estradiol (E2), p-n-nonylphenol (NP), and bisphenol A (BPA). In E2 (0.10-222 nM)-treated 7 dpf embryos and 9 or 12 dpf larvae, ChgL, ChgH, and ChgHm expression was up-regulated in a concentration-dependent manner. By contrast, interestingly, Vtg1 and Vtg2 expression was not induced in E2-treated 7 dpf embryos but was significantly induced in 9 and 12 dpf larvae, suggesting a developmental-stage-specific regulatory mechanism underlying Vtg expression. The maximum concentrations of NP (0.09-1.5 μM) and BPA (1.8-30 μM) up-regulated Chg expression in 9 or 12 dpf larvae, and the relative estrogenic potencies (REPs) of E2, NP, and BPA were 1, 2.1 × 10-4, and 1.0 × 10-5, respectively. Chg messenger RNA (mRNA) in medaka embryos and larvae can be used as a sensitive biomarker for screening potential estrogenic EDCs. Our assay system using embryos and larvae can be used as an in vivo alternative model because independent feeding stages (e.g., embryonic and early larval stages) are suitable alternatives.
Collapse
Affiliation(s)
- Hiroshi Ishibashi
- Graduate School of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama, 790-8566, Japan
| | - Masaya Uchida
- Department of Creative Engineering, National Institute of Technology, Ariake College, 150 Higashi-Hagio, Omuta, Fukuoka, 836-8585, Japan
| | - Yuki Temma
- Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama, 790-8566, Japan
| | - Masashi Hirano
- Department of Biological and Chemical Systems Engineering, National Institute of Technology, Kumamoto College, 2627 Hirayama-shinmachi, Yatsushiro, Kumamoto, 866-8501, Japan
| | - Nobuaki Tominaga
- Department of Creative Engineering, National Institute of Technology, Ariake College, 150 Higashi-Hagio, Omuta, Fukuoka, 836-8585, Japan
| | - Koji Arizono
- Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, 3-1-100 Tsukide, Higashi-ku, Kumamoto, 862-8502, Japan.
| |
Collapse
|
7
|
Qi P, Ren S, Tang Z, Guo B, Xia H. Expression of zona pellucida 3 gene is regulated by 17α-ethinylestradiol in adult topmouth culter Culter alburnus. Comp Biochem Physiol C Toxicol Pharmacol 2018; 214:43-51. [PMID: 30189258 DOI: 10.1016/j.cbpc.2018.08.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 08/30/2018] [Accepted: 08/31/2018] [Indexed: 01/04/2023]
Abstract
Estrogen could lead to abnormal modulation or disruption of physical development, reproduction and sexual behavior in aquatic wildlife, especially in fish. Information on the toxicity of estrogens to native species in that can be used in site-specific risk assessments is scarce. In the present study, one zona pellucida 3 (ZP3) homologue termed CaZP3 was firstly identified from topmouth culter Culter alburnus, following its structural characteristics, tissue distribution and transcriptional modulation to 17α-ethinylestradiol (EE2) exposure were investigated. Meanwhile, vitellogenin (VTG) gene was employed to provide a comparison of the reactive ability to EE2 induction. The CaZP3 characterized with analogical functional domains such as ZP domain, SP, IHP, EHP, 12 cysteine residues, one N-linked glycosylation site and two conserved O-linked glycosylation sites and equal number of eight exons and seven introns with ZP3 counterparts of higher species. CaZP3 mRNA predominantly expressed in ovary, besides, highly expressed in female heart and male muscle and relatively high expressed in testis. CaZP3 has the lower reactive ability to EE2 induction in comparison with VTG, however, CaZP3 transcripts were significantly induced in gonads of both male and female culter by EE2 and could be used as an alternative biomarker to monitor EE2 activity. The present results supplement the database for toxicity of EE2, especially for fish species endemic to China and provide some useful information for the monitoring of EE2 activity in aquatic environment.
Collapse
Affiliation(s)
- Pengzhi Qi
- National Engineering Research Center of Marine Facilities Aquaculture, Zhejiang Ocean University, Zhejiang, Zhoushan 316004, China.
| | - Shitai Ren
- National Engineering Research Center of Marine Facilities Aquaculture, Zhejiang Ocean University, Zhejiang, Zhoushan 316004, China
| | - Zurong Tang
- National Engineering Research Center of Marine Facilities Aquaculture, Zhejiang Ocean University, Zhejiang, Zhoushan 316004, China
| | - Baoying Guo
- National Engineering Research Center of Marine Facilities Aquaculture, Zhejiang Ocean University, Zhejiang, Zhoushan 316004, China
| | - Hu Xia
- Collaborative Innovation Center for Efficient and Health Production of Fisheries in Hunan province, Hunan University of Arts and Science, Hunan, Changde 415000, China
| |
Collapse
|
8
|
Tran TKA, MacFarlane GR, Kong RYC, O'Connor WA, Yu RMK. The constitutively active estrogen receptor (ER) binds and activates the promoter of the vitellogenin (Vtg) gene in the Sydney rock oyster, Saccostrea glomerata. MARINE POLLUTION BULLETIN 2017; 118:397-402. [PMID: 28259423 DOI: 10.1016/j.marpolbul.2017.02.060] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 02/17/2017] [Accepted: 02/22/2017] [Indexed: 06/06/2023]
Abstract
Vitellogenin (Vtg) is a well-established biomarker of estrogenic exposure in aquatic animals. In vertebrates, Vtg gene transcription is controlled by the estrogen receptors (ERs). Although an ER ortholog is present in molluscs, its role as a transcriptional regulator remains elusive. Here, we tested the hypothesis that in the Sydney rock oyster, Saccostrea glomerata, the ER ortholog activates Vtg gene transcription through specific interaction with its promoter. Luciferase reporter assays indicated that sgER activated both a minimal promoter containing the consensus estrogen-responsive elements (EREs) and the sgVtg promoter in an estrogen-independent manner. The sgVtg promoter-luciferase activation was significantly reduced when any of three putative ERE half sites (½EREs) in the promoter were mutated. Electrophoretic mobility shift assay (EMSA) confirmed that sgER binds specifically to a 68-bp promoter sequence where these ½EREs reside. Overall, the results suggest that sgER is a constitutively active transcription factor that binds and activates the sgVtg promoter.
Collapse
Affiliation(s)
- Thi Kim Anh Tran
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia; Department of Agriculture, Forestry and Fisheries, Vinh University, 182 Le Duan St., Vinh City, Nghe An, Vietnam
| | - Geoff R MacFarlane
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Richard Yuen Chong Kong
- Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Wayne A O'Connor
- New South Wales Department of Primary Industries, Port Stephens Fisheries Institute, Taylors Beach, NSW 2316, Australia
| | - Richard Man Kit Yu
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, NSW 2308, Australia.
| |
Collapse
|
9
|
Spirhanzlova P, Leleu M, Sébillot A, Lemkine GF, Iguchi T, Demeneix BA, Tindall AJ. Oestrogen reporter transgenic medaka for non-invasive evaluation of aromatase activity. Comp Biochem Physiol C Toxicol Pharmacol 2016; 179:64-71. [PMID: 26352216 DOI: 10.1016/j.cbpc.2015.08.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Revised: 08/27/2015] [Accepted: 08/28/2015] [Indexed: 02/05/2023]
Abstract
Vertebrate reproduction involves complex steroid hormone interplay and inter-conversion. A critical element in maintaining sex steroid levels is the enzyme aromatase (cytochrome P450 19A1) which converts androgens to oestrogens. In turn oestrogen signalling is targeted by numerous chemicals, from pharmaceuticals to agricultural chemicals, both frequent sources of contamination in waste waters and consequently rivers. Although many models are now available to address disruption of oestrogen signalling, there are currently no published protocols allowing discrimination between alterations in testosterone metabolism and in oestrogenic signalling. It was with this limitation in mind that we optimised this protocol. We show using a 48h protocol that pre-feeding fry of the choriogenin h-gfp (chgh-gfp) medaka line are sensitive to 0.05nM EE2 (15ng/L), within the range of the lowest published observable physiological effect concentrations for medaka. In addition, co-treatment with testosterone can reveal potential effects of test substances on aromatase enzymatic activity. As the measurements are visualised in real-time without affecting embryo viability, repeated measures are possible. We demonstrate the ability of this model to detect oestrogen receptor agonists, aromatisable androgens, P450 aromatase activity modulators and selective oestrogen response modulators. Importantly, the range of this assay is physiologically relevant.
Collapse
Affiliation(s)
- Petra Spirhanzlova
- WatchFrog S.A., 1 rue Pierre Fontaine, 91000 Evry, France; CNRS UMR 7221, Evolution des Régulations Endocriniennes, Département Régulations, Développement et Diversité Moléculaire, Muséum National d'Histoire Naturelle, Paris, France
| | - Mathilde Leleu
- WatchFrog S.A., 1 rue Pierre Fontaine, 91000 Evry, France
| | | | | | - Taisen Iguchi
- Okazaki Institute for Integrative Bioscience, National Institute for Basic Biology, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan
| | - Barbara A Demeneix
- CNRS UMR 7221, Evolution des Régulations Endocriniennes, Département Régulations, Développement et Diversité Moléculaire, Muséum National d'Histoire Naturelle, Paris, France
| | | |
Collapse
|
10
|
Kawaguchi M, Tomita K, Sano K, Kaneko T. Molecular events in adaptive evolution of the hatching strategy of ovoviviparous fishes. JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION 2014; 324:41-50. [DOI: 10.1002/jez.b.22601] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Accepted: 09/29/2014] [Indexed: 11/11/2022]
Affiliation(s)
- Mari Kawaguchi
- Department of Materials and Life Sciences; Faculty of Science and Technology; Sophia University; Tokyo Japan
| | - Kenji Tomita
- Technology Advancement Center; Graduate School of Agricultural and Life Sciences; The University of Tokyo; Tokyo Japan
| | - Kaori Sano
- Department of Chemistry; Faculty of Science; Josai University; Saitama Japan
| | - Toyoji Kaneko
- Department of Aquatic Bioscience; Graduate School of Agricultural and Life Sciences; The University of Tokyo; Tokyo Japan
| |
Collapse
|
11
|
Yamaguchi A, Kato K, Arizono K, Tominaga N. Induction of the estrogen-responsive genes encoding choriogenin H and L in the liver of male medaka (Oryzias latipes) upon exposure to estrogen receptor subtype-selective ligands. J Appl Toxicol 2014; 35:752-8. [DOI: 10.1002/jat.3063] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Revised: 07/15/2014] [Accepted: 07/15/2014] [Indexed: 01/20/2023]
Affiliation(s)
- Akemi Yamaguchi
- Department of Chemical and Biological Engineering; Ariake National College of Technology; 150 Higashihagio-machi Omuta Fukuoka 836-8585 Japan
| | - Keisuke Kato
- Faculty of Pharmaceutical Sciences; Toho University; 2-2-1 Miyama Funabashi Chiba 274-8510 Japan
| | - Koji Arizono
- Faculty of Environmental and Symbiotic Sciences; Prefectural University of Kumamoto; 3-1-10 Tsukide Kumamoto 862-8502 Japan
| | - Nobuaki Tominaga
- Department of Chemical and Biological Engineering; Ariake National College of Technology; 150 Higashihagio-machi Omuta Fukuoka 836-8585 Japan
| |
Collapse
|
12
|
Yuan C, Zhang Y, Hu G, Li M, Zheng Y, Gao J, Yang Y, Zhou Y, Wang Z. Expression of two zona pellucida genes is regulated by 17α-ethinylestradiol in adult rare minnow Gobiocypris rarus. Comp Biochem Physiol C Toxicol Pharmacol 2013; 158:1-9. [PMID: 23603245 DOI: 10.1016/j.cbpc.2013.04.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 04/01/2013] [Accepted: 04/10/2013] [Indexed: 12/20/2022]
Abstract
Zona pellucida (ZP) proteins are glycoproteins synthesized in liver, ovary or in both tissues in fish. In the present study, we aimed to determine the responsiveness of ZP2 and ZP3 to 17α-ethinylestradiol (EE2) in adult rare minnow Gobiocypris rarus. The full length of ZP3 cDNA was firstly characterized and its tissue distribution revealed that ZP3 mRNA was predominantly expressed in ovary of G. rarus. The gene expression profiles of ZP2, ZP3 and vitellogenin (VTG) were analyzed in gonad and liver of adult G. rarus exposed to EE2 at 1, 5, 25, and 125 ng/L for 3 and 6 days. The results show that ZP2 is more sensitive than ZP3 in gonads of both genders, and VTG in liver is extremely sensitive to EE2 in male fish. However, at lower concentrations (1 and 5 ng/L), the ZP2 in testes shows higher responsiveness to EE2 compared with VTG in rare minnow. The 5' flanking regions of ZP2 and ZP3 were isolated and the comparison of transcription factors in the regions of ZP2 and ZP3 suggested that the disparity for the responsiveness of ZP2 and ZP3 to EE2 could partly be a result of differential cis-elements such as oocyte-specific protein (Osp1) binding sites or/and sex-determining region Y (SRY) binding site.
Collapse
Affiliation(s)
- Cong Yuan
- College of Animal Science and Technology, Northwest A&F University, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Yangling, Shaanxi 712100 China
| | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Cho YS, Kim DS, Nam YK. Characterization of estrogen-responsive transgenic marine medaka Oryzias dancena germlines harboring red fluorescent protein gene under the control by endogenous choriogenin H promoter. Transgenic Res 2013; 22:501-17. [PMID: 22972478 DOI: 10.1007/s11248-012-9650-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Accepted: 08/30/2012] [Indexed: 10/27/2022]
Abstract
Transgenic marine medaka (Oryzias dancena) germlines were generated by the microinjection of the red fluorescent protein (RFP) reporter gene (rfp) driven by the endogenous choriogenin H gene (chgH) promoter. The selected transgenic lines contained multiple copies of the transgene (3-42 copies per cell) in their genomes. Although all the founders were mosaic, the transgene was stably transmitted from the F1 generation to all subsequent generations following a Mendelian pattern. Different transgenic lines showed different responsiveness to estradiol-17β (E2) exposure at the mRNA and protein levels, and the expression efficiency was dependent upon the transgene copy number. The induction of RFP was significantly affected by the developmental stage of transgenic larvae: later-stage larvae (older than 7 days post-hatching) showed higher sensitivity to E2 exposure than earlier-stage larvae. The response of transgenic expression to E2 was fairly dependent upon the E2 dose (200-3,200 ng/L) and exposure period (1-7 days), according to both a microscopic examination of RFP intensity and a qRT-PCR assay. The transgenic marine medaka showed similar transgenic responses to E2 under freshwater, brackish, and seawater conditions. In addition to E2, the transgenic RFP signal was also successfully induced during 1-week exposure to various other natural (1 μg/L estrone and 10 μg/L estriol) and synthetic (xeno)estrogens (0.1 μg/L 17α-ethynylestradiol, 1 μg/L diethylstilbestrol, and 10 mg/L bisphenol A). The efficiency of transgene expression varied greatly among the chemicals tested. The results of this study suggest that the chgH-rfp transgenic marine medaka species will be useful in the in vivo detection of waterborne estrogens under a wide range of salinity conditions.
Collapse
Affiliation(s)
- Young Sun Cho
- Institute of Marine Living Modified Organisms, Pukyong National University, Busan 608-737, South Korea
| | | | | |
Collapse
|
14
|
SANO KAORI, KAWAGUCHI MARI, WATANABE SATOSHI, NAGAKURA YOSHITOMO, HIRAKI TAKASHI, YASUMASU SHIGEKI. Inferring the Evolution of TeleosteanzpGenes Based on Their Sites of Expression. JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION 2013; 320:332-43. [DOI: 10.1002/jez.b.22507] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Revised: 02/26/2013] [Accepted: 04/01/2013] [Indexed: 11/09/2022]
Affiliation(s)
- KAORI SANO
- Department of Science and Technology; Sophia University; Tokyo Japan
| | - MARI KAWAGUCHI
- Department of Science and Technology; Sophia University; Tokyo Japan
| | - SATOSHI WATANABE
- Japan International Research Center for Agricultural Sciences; Tsukuba Japan
| | - YOSHITOMO NAGAKURA
- Tohoku National Fisheries Research Institute; Fisheries Research Agency; Miyagi Japan
| | - TAKASHI HIRAKI
- Department of Science and Technology; Sophia University; Tokyo Japan
| | - SHIGEKI YASUMASU
- Department of Science and Technology; Sophia University; Tokyo Japan
| |
Collapse
|
15
|
Lee O, Tyler CR, Kudoh T. Development of a transient expression assay for detecting environmental oestrogens in zebrafish and medaka embryos. BMC Biotechnol 2012; 12:32. [PMID: 22726887 PMCID: PMC3410757 DOI: 10.1186/1472-6750-12-32] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 06/24/2012] [Indexed: 12/02/2022] Open
Abstract
Background Oestrogenic contaminants are widespread in the aquatic environment and have been shown to induce adverse effects in both wildlife (most notably in fish) and humans, raising international concern. Available detecting and testing systems are limited in their capacity to elucidate oestrogen signalling pathways and physiological impacts. Here we developed a transient expression assay to investigate the effects of oestrogenic chemicals in fish early life stages and to identify target organs for oestrogenic effects. To enhance the response sensitivity to oestrogen, we adopted the use of multiple tandem oestrogen responsive elements (EREc38) in a Tol2 transposon mediated Gal4ff-UAS system. The plasmid constructed (pTol2_ERE-TATA-Gal4ff), contains three copies of oestrogen response elements (3ERE) that on exposure to oestrogen induces expression of Gal4ff which this in turn binds Gal4-responsive Upstream Activated Sequence (UAS) elements, driving the expression of a second reporter gene, EGFP (Enhanced Green Fluorescent Protein). Results The response of our construct to oestrogen exposure in zebrafish embryos was examined using a transient expression assay. The two plasmids were injected into 1–2 cell staged zebrafish embryos, and the embryos were exposed to various oestrogens including the natural steroid oestrogen 17ß-oestradiol (E2), the synthetic oestrogen 17α- ethinyloestradiol (EE2), and the relatively weak environmental oestrogen nonylphenol (NP), and GFP expression was examined in the subsequent embryos using fluorescent microscopy. There was no GFP expression detected in unexposed embryos, but specific and mosaic expression of GFP was detected in the liver, heart, somite muscle and some other tissue cells for exposures to steroid oestrogen treatments (EE2; 10 ng/L, E2; 100 ng/L, after 72 h exposures). For the NP exposures, GFP expression was observed at 10 μg NP/L after 72 h (100 μg NP/L was toxic to the fish). We also demonstrate that our construct works in medaka, another model fish test species, suggesting the transient assay is applicable for testing oestrogenic chemicals in fish generally. Conclusion Our results indicate that the transient expression assay system can be used as a rapid integrated testing system for environmental oestrogens and to detect the oestrogenic target sites in developing fish embryos.
Collapse
Affiliation(s)
- Okhyun Lee
- Biosciences, College of Life and Environmental Sciences, University of Exeter, Exeter, Devon, EX4 4PS, UK
| | | | | |
Collapse
|
16
|
Pinto PIS, Teodósio R, Socorro S, Power DM, Canário AVM. Structure, tissue distribution and estrogen regulation of splice variants of the sea bream estrogen receptor α gene. Gene 2012; 503:18-24. [PMID: 22579469 DOI: 10.1016/j.gene.2012.04.081] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2012] [Revised: 04/15/2012] [Accepted: 04/26/2012] [Indexed: 01/27/2023]
Abstract
Estrogen actions are mainly mediated by specific nuclear estrogen receptors (ERs), for which different genes and a diversity of transcript variants have been identified, mainly in mammals. In this study, we investigated the presence of ER splice variants in the teleost fish gilthead sea bream (Sparus auratus), by comparison with the genomic organization of the related species Takifugu rubripes. Two exon2-deleted ERα transcript variants were isolated from liver cDNA of estradiol-treated fish. The ΔE2 variant lacks ERα exon 2, generating a premature termination codon and a putative C-terminal truncated receptor, while the ΔE2,3* variant contains an in-frame deletion of exon 2 and part of exon 3 and codes for a putative ERα protein variant lacking most of the DNA-binding domain. Both variants were expressed at very low levels in several female and male sea bream tissues, and their expression was highly inducible in liver by estradiol-17β treatment with a strong positive correlation with the typical wild-type (wt) ERα response in this tissue. These findings identify novel estrogen responsive splice variants of fish ERα, and provide the basis for future studies to investigate possible modulation of wt-ER actions by splice variants.
Collapse
Affiliation(s)
- P I S Pinto
- University of Algarve, Campus de Gambelas, Faro, Portugal.
| | | | | | | | | |
Collapse
|
17
|
Wu T, Wang H, Qin F, Liu S, Li M, Xu P, Wang Z. Expression of zona pellucida B proteins in juvenile rare minnow (Gobiocypris rarus) exposed to 17α-ethinylestradiol, 4-nonylphenol and bisphenol A. Comp Biochem Physiol C Toxicol Pharmacol 2012; 155:259-68. [PMID: 21946248 DOI: 10.1016/j.cbpc.2011.09.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Revised: 09/09/2011] [Accepted: 09/11/2011] [Indexed: 01/20/2023]
Abstract
Zona pellucida (ZP) containing proteins are glycoproteins in teleost chorion and are encoded by several gene subfamilies, mainly including ZPA, ZPB, ZPC and ZPX genes. In teleost species, ZP genes are expressed either in liver under regulation of estrogen or in ovary. In the present study, five ZP gene isoforms were isolated and characterized in Gobiocypris rarus. The putative amino acid sequences of these ZP gene isoforms contain the typical trefoil motif and a ZP domain. These five G. rarus ZP gene isoforms were named as grZPB.1, grZPB.2, grZPB.3, grZPB.4 and grZPB.5. Real-time quantitative reverse transcription PCR (RT-qPCR) analysis indicated that all these ZP mRNA isoforms were exclusively expressed in ovary. G. rarus juveniles at the age of 21 days postfertilization were exposed to 17α-ethinylestradiol (EE2; 0.01, 0.1 and 1 nM), 4-nonylphenol (4-NP; 10, 100 and 1000 nM) or bisphenol A (BPA; 0.1, 1 and 10nM) for 3 days. mRNA expressions of ZPB isoforms following the exposure to xenoestrogen were detected by RT-qPCR. Data were analyzed by the 2(-△△Cq) method. The results indicate that induction by 0.1-1nM EE2 on mRNA expression of the grZPB isoforms is weaker than for vitellogenin. 4-NP exposures at three concentrations had differential effects on the grZPBs. BPA at three concentrations weakly induced mRNA expression of the grZPB isoforms.
Collapse
MESH Headings
- Amino Acid Sequence
- Animals
- Benzhydryl Compounds
- Cloning, Molecular
- Cyprinidae/embryology
- Cyprinidae/metabolism
- Dose-Response Relationship, Drug
- Egg Proteins/classification
- Egg Proteins/genetics
- Embryo, Nonmammalian/drug effects
- Embryo, Nonmammalian/embryology
- Embryo, Nonmammalian/metabolism
- Estrogens/toxicity
- Ethinyl Estradiol/toxicity
- Female
- Fish Proteins/genetics
- Gene Expression Profiling
- Gene Expression Regulation, Developmental/drug effects
- Male
- Membrane Glycoproteins/classification
- Membrane Glycoproteins/genetics
- Molecular Sequence Data
- Ovary/drug effects
- Ovary/embryology
- Ovary/metabolism
- Phenols/toxicity
- Phylogeny
- Protein Isoforms/genetics
- Receptors, Cell Surface/classification
- Receptors, Cell Surface/genetics
- Reverse Transcriptase Polymerase Chain Reaction
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Xenobiotics/toxicity
- Zona Pellucida Glycoproteins
Collapse
Affiliation(s)
- Tingting Wu
- College of Animal Science and Technology, Northwest A&F University, Shaanxi Key Laboratory of Molecular Biology for Agriculture, Yangling, Shaanxi 712100, China
| | | | | | | | | | | | | |
Collapse
|
18
|
Fan CY, Simmons SO, Law SHW, Jensen K, Cowden J, Hinton D, Padilla S, Ramabhadran R. Generation and characterization of neurogenin1-GFP transgenic medaka with potential for rapid developmental neurotoxicity screening. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2011; 105:127-135. [PMID: 21718657 DOI: 10.1016/j.aquatox.2011.05.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Revised: 05/23/2011] [Accepted: 05/28/2011] [Indexed: 05/31/2023]
Abstract
Fish models such as zebrafish and medaka are increasingly used as alternatives to rodents in developmental and toxicological studies. These developmental and toxicological studies can be facilitated by the use of transgenic reporters that permit the real-time, noninvasive observation of the fish. Here we report the construction and characterization of transgenic medaka lines expressing green fluorescent protein (GFP) under the control of the zebrafish neurogenin 1 (ngn1) gene promoter. Neurogenin (ngn1) is a helix-loop-helix transcription factor expressed in proliferating neuronal progenitor cells early in neuronal differentiation and plays a crucial role in directing neurogenesis. GFP expression was detected from 24 h post-fertilization until hatching, in a spatial pattern consistent with the previously reported zebrafish ngn1 expression. Temporal expression of the transgene parallels the expression profile of the endogenous medaka ngn1 transcript. Further, we demonstrate that embryos from the transgenic line permit the non-destructive, real-time screening of ngn1 promoter-directed GFP expression in a 96-well format, enabling higher throughput studies of developmental neurotoxicants. This strain has been deposited with and maintained by the National BioResource Project and is available on request (http://www.shigen.nig.ac.jp/medaka/strainDetailAction.do?quickSearch=true&strainId=5660).
Collapse
Affiliation(s)
- Chun-Yang Fan
- Integrated Systems Toxicology and Toxicity Assessment Divisions, National Health and Environmental Effects Research Laboratory, US EPA, Research Triangle Park, NC 27711, USA
| | | | | | | | | | | | | | | |
Collapse
|
19
|
Affiliation(s)
- Pauliina Damdimopoulou
- Department of Biosciences and Nutrition, Karolinska Institutet, Novum, S-14157 Huddinge, Sweden.
| | | |
Collapse
|
20
|
Cows I, Bolland J, Nunn A, Kerins G, Stein J, Blackburn J, Hart A, Henry C, Britton JR, Coop G, Peeler E. Defining environmental risk assessment criteria for genetically modified fishes to be placed on the EU market. ACTA ACUST UNITED AC 2010. [DOI: 10.2903/sp.efsa.2010.en-69] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- I.G. Cows
- Hull International Fisheries Institute, Food and Environmental Research Agency, Bournemouth University, Center for Environment, Fisheries and Aquaculture Science
| | - J.D. Bolland
- Hull International Fisheries Institute, Food and Environmental Research Agency, Bournemouth University, Center for Environment, Fisheries and Aquaculture Science
| | - A.D. Nunn
- Hull International Fisheries Institute, Food and Environmental Research Agency, Bournemouth University, Center for Environment, Fisheries and Aquaculture Science
| | - G. Kerins
- Hull International Fisheries Institute, Food and Environmental Research Agency, Bournemouth University, Center for Environment, Fisheries and Aquaculture Science
| | - J. Stein
- Hull International Fisheries Institute, Food and Environmental Research Agency, Bournemouth University, Center for Environment, Fisheries and Aquaculture Science
| | - J. Blackburn
- Hull International Fisheries Institute, Food and Environmental Research Agency, Bournemouth University, Center for Environment, Fisheries and Aquaculture Science
| | - A. Hart
- Hull International Fisheries Institute, Food and Environmental Research Agency, Bournemouth University, Center for Environment, Fisheries and Aquaculture Science
| | - C. Henry
- Hull International Fisheries Institute, Food and Environmental Research Agency, Bournemouth University, Center for Environment, Fisheries and Aquaculture Science
| | - J. R. Britton
- Hull International Fisheries Institute, Food and Environmental Research Agency, Bournemouth University, Center for Environment, Fisheries and Aquaculture Science
| | - G. Coop
- Hull International Fisheries Institute, Food and Environmental Research Agency, Bournemouth University, Center for Environment, Fisheries and Aquaculture Science
| | - E. Peeler
- Hull International Fisheries Institute, Food and Environmental Research Agency, Bournemouth University, Center for Environment, Fisheries and Aquaculture Science
| |
Collapse
|
21
|
Katsiadaki I, Williams TD, Ball JS, Bean TP, Sanders MB, Wu H, Santos EM, Brown MM, Baker P, Ortega F, Falciani F, Craft JA, Tyler CR, Viant MR, Chipman JK. Hepatic transcriptomic and metabolomic responses in the Stickleback (Gasterosteus aculeatus) exposed to ethinyl-estradiol. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2010; 97:174-187. [PMID: 19665239 DOI: 10.1016/j.aquatox.2009.07.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2009] [Revised: 07/09/2009] [Accepted: 07/10/2009] [Indexed: 05/28/2023]
Abstract
An established three-spined stickleback (Gasterosteus aculeatus) cDNA array was expanded to 14,496 probes with the addition of hepatic clones derived from subtractive and normalized libraries from control males and males exposed to model toxicants. Microarrays and one-dimensional (1)H nuclear magnetic resonance (NMR) spectroscopy, together with individual protein and gene biomarkers were employed to investigate the hepatic responses of the stickleback to ethinyl-estradiol (EE(2)) exposure. Male fish were exposed via the water to EE(2), including environmentally relevant concentrations (0.1-100ng/l) for 4 days, and hepatic transcript and metabolite profiles, kidney spiggin protein and serum vitellogenin concentrations were determined in comparison to controls. EE(2) exposure did not significantly affect spiggin concentration but significantly induced serum vitellogenin protein at the threshold concentration of 32ng/l. (1)H NMR coupled with robust univariate testing revealed only limited changes, but these did support the predicted modulation of the amino acid profile by transcriptomics. Transcriptional induction was found for hepatic vitellogenins and choriogenins as expected, together with a range of other EE(2)-responsive genes. Choriogenins showed the more sensitive responses with statistically significant induction at 10ng/l. Real-time polymerase chain reaction (PCR) confirmed transcriptional induction of these genes. Phosvitinless vitellogenin C transcripts were highly expressed and represent a major form of the egg yolk precursors, and this is in contrast to other fish species where it is a minor component of vitellogenic transcripts. Differences in inducibility between the vitellogenins and choriogenins appear to be in accordance with the sequential formation of chorion and yolk during oogenesis in fish.
Collapse
Affiliation(s)
- Ioanna Katsiadaki
- Centre for Environment, Fisheries and Aquaculture Science, Cefas Weymouth Laboratory, Weymouth, Dorset, UK.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Connon RE, Geist J, Pfeiff J, Loguinov AV, D'Abronzo LS, Wintz H, Vulpe CD, Werner I. Linking mechanistic and behavioral responses to sublethal esfenvalerate exposure in the endangered delta smelt; Hypomesus transpacificus (Fam. Osmeridae). BMC Genomics 2009; 10:608. [PMID: 20003521 PMCID: PMC2806348 DOI: 10.1186/1471-2164-10-608] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2009] [Accepted: 12/15/2009] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND The delta smelt (Hypomesus transpacificus) is a pelagic fish species listed as endangered under both the USA Federal and Californian State Endangered Species Acts and considered an indicator of ecosystem health in its habitat range, which is limited to the Sacramento-San Joaquin estuary in California, USA. Anthropogenic contaminants are one of multiple stressors affecting this system, and among them, current-use insecticides are of major concern. Interrogative tools are required to successfully monitor effects of contaminants on the delta smelt, and to research potential causes of population decline in this species. We have created a microarray to investigate genome-wide effects of potentially causative stressors, and applied this tool to assess effects of the pyrethroid insecticide esfenvalerate on larval delta smelt. Selected genes were further investigated as molecular biomarkers using quantitative PCR analyses. RESULTS Exposure to esfenvalerate affected swimming behavior of larval delta smelt at concentrations as low as 0.0625 mug.L-1, and significant differences in expression were measured in genes involved in neuromuscular activity. Alterations in the expression of genes associated with immune responses, along with apoptosis, redox, osmotic stress, detoxification, and growth and development appear to have been invoked by esfenvalerate exposure. Swimming impairment correlated significantly with expression of aspartoacylase (ASPA), an enzyme involved in brain cell function and associated with numerous human diseases. Selected genes were investigated for their use as molecular biomarkers, and strong links were determined between measured downregulation in ASPA and observed behavioral responses in fish exposed to environmentally relevant pyrethroid concentrations. CONCLUSIONS The results of this study show that microarray technology is a useful approach in screening for, and generation of molecular biomarkers in endangered, non-model organisms, identifying specific genes that can be directly linked with sublethal toxicological endpoints; such as changes in expression levels of neuromuscular genes resulting in measurable swimming impairments. The developed microarrays were successfully applied on larval fish exposed to esfenvalerate, a known contaminant of the Sacramento-San Joaquin estuary, and has permitted the identification of specific biomarkers which could provide insight into the factors contributing to delta smelt population decline.
Collapse
Affiliation(s)
- Richard E Connon
- School of Veterinary Medicine, Department of Anatomy, Physiology and Cell Biology, University of California, Davis, California 95616, USA
| | - Juergen Geist
- School of Veterinary Medicine, Department of Anatomy, Physiology and Cell Biology, University of California, Davis, California 95616, USA
- Unit of Functional Aquatic Ecology and Fish Biology, Department of Animal Science, Technische Universität München, D-85350 Freising, Germany
| | - Janice Pfeiff
- School of Veterinary Medicine, Molecular Biosciences, University of California, Davis, California 95616, USA
| | - Alexander V Loguinov
- School of Nutritional Sciences and Toxicology, University of California, Berkeley, California 94720, USA
| | - Leandro S D'Abronzo
- School of Veterinary Medicine, Department of Anatomy, Physiology and Cell Biology, University of California, Davis, California 95616, USA
| | - Henri Wintz
- School of Nutritional Sciences and Toxicology, University of California, Berkeley, California 94720, USA
- Biorad Laboratories, Life Science Research, Hercules, California, USA
| | - Christopher D Vulpe
- School of Nutritional Sciences and Toxicology, University of California, Berkeley, California 94720, USA
| | - Inge Werner
- School of Veterinary Medicine, Department of Anatomy, Physiology and Cell Biology, University of California, Davis, California 95616, USA
| |
Collapse
|
23
|
Rhee JS, Kang HS, Raisuddin S, Hwang DS, Han J, Kim RO, Seo JS, Lee YM, Park GS, Lee SJ, Lee JS. Endocrine disruptors modulate expression of hepatic choriogenin genes in the hermaphroditic fish, Kryptolebias marmoratus. Comp Biochem Physiol C Toxicol Pharmacol 2009; 150:170-8. [PMID: 19393767 DOI: 10.1016/j.cbpc.2009.04.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Revised: 04/18/2009] [Accepted: 04/20/2009] [Indexed: 11/27/2022]
Abstract
Choriogenins (Chgs) are precursors of inner layer of egg envelope that are synthesized in fish liver in response to estrogens. Therefore, study of their expression serves as biomarker of exposure to endocrine disrupting chemicals (EDCs). The self-fertilizing fish, Kryptolebias marmoratus has been established as a model species for testing the action of EDCs. To use this fish as a model for assessing estrogenic activity of EDCs on Chg expression, two K. marmoratus choreogenin genes, Km-ChgH and Km-ChgL were cloned and their expression was analyzed in different tissues and in developmental stages by real-time RT-PCR. Expression levels of liver mRNA were compared between hermaphrodites and secondary males after exposure to EDCs. Km-ChgH and Km-ChgL genes that were predominantly expressed in liver contained zona pellucida (ZP) domains. During embryonic development, low expression of mRNA was observed at stage 1 (2 dpf) that reached highest level at stage 4 (12 dpf) or stage 5 (5 h post hatching). The expression of Km-Chg mRNAs was highly increased in liver exposed to natural estrogen, 17alpha-estradiol (E2) as well as EDCs such as bisphenol A and 4-n-nonylphenol in both the gender types. Another EDC, 4-tert-octylphenol, showed modulatory effect only on Km-ChgH in hermaphrodites. Tamoxifen, an antagonist of the estrogen receptor showed no effect on expression of Chg genes in either of the gender types of K. marmoratus. These findings indicate that Km-Chg genes would be associated with estrogen and measurement of their expression would serve as a surrogate biomarker of exposure to environmental EDCs.
Collapse
Affiliation(s)
- Jae-Sung Rhee
- Department of Molecular and Environmental Bioscience, Graduate School, Hanyang University, Seoul 133-791, South Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Hu SY, Chen MHC, Lin YC, Lin GH, Gong HY, Yang TH, Wu JL. Cloning and functional analysis of the proximal promoter region of the three GnRH genes from the silver sea bream (Sparus sarba). Comp Biochem Physiol B Biochem Mol Biol 2008; 151:373-80. [DOI: 10.1016/j.cbpb.2008.06.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2008] [Revised: 06/14/2008] [Accepted: 06/18/2008] [Indexed: 11/24/2022]
|
25
|
Chen X, Li VWT, Yu RMK, Cheng SH. Choriogenin mRNA as a sensitive molecular biomarker for estrogenic chemicals in developing brackish medaka (Oryzias melastigma). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2008; 71:200-208. [PMID: 18048097 DOI: 10.1016/j.ecoenv.2007.10.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2007] [Revised: 09/12/2007] [Accepted: 10/03/2007] [Indexed: 05/25/2023]
Abstract
Teleost choriogenins, precursors of the inner layer subunits of the egg envelope, are regarded as sensitive biomarkers for estrogenic pollutants. In this study, two full-length cDNAs, omChgH and omChgL, which encode the choriogenin H and L forms, respectively, were isolated from a brackish medaka, Oryzias melastigma. 17beta-Estradiol (E2; 10 microg/L)-dependent expression of omChgH and omChgL was observed starting at embryonic stage 34 and restricted exclusively to the liver. In hatchlings, E2 induction of omChgH was stronger than that of omChgL. Static exposure of adult fish to E2 (0, 1, 10, 100, and 500 ng/L), 17alpha-ethinylestradiol (EE2; 0, 1, 10, 100 and 500 ng/L), 4-nonylphenol (NP; 0, 1, 10, 100, and 200 microg/L), and bisphenol A (BPA; 0, 1, 10, 100, and 200 microg/L) in artificial seawater for 7 days resulted in dose-dependent induction of both genes in the liver. In the male livers, the sensitivity of omChgH to these estrogenic compounds was higher than that of omChgL; the lowest-observed-effect concentrations (LOECs) of E2, EE2, NP, and BPA on omChgH were 10 ng/L, 10 ng/L, 100 microg/L and 100 microg/L, respectively, and on omChgL were 100 ng/L, 100 ng/L, 100 microg/L, and 200 microg/L, respectively. All these suggest that omChgH can be used as a highly sensitive biomarker for monitoring estrogenic chemicals in the marine environment.
Collapse
Affiliation(s)
- Xueping Chen
- Department of Biology and Chemistry, Centre for Marine Environmental Research and Innovative Technology, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, PR China.
| | | | | | | |
Collapse
|
26
|
Kurauchi K, Hirata T, Kinoshita M. Characteristics of ChgH-GFP transgenic medaka lines, an in vivo estrogenic compound detection system. MARINE POLLUTION BULLETIN 2008; 57:441-444. [PMID: 18513755 DOI: 10.1016/j.marpolbul.2008.03.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2007] [Revised: 03/02/2008] [Accepted: 03/04/2008] [Indexed: 05/26/2023]
Abstract
We previously reported the characteristics of a ChgH-GFP transgenic medaka line that indicates estrogenic compound pollution in environmental water by the green fluorescence of their liver. Recently, we established four more lines. In this study, the characteristics of the five transgenic medaka lines were investigated. The intensity of reporter gene expression varied among transgenic lines and generally correlated well with the amount of integrated transgene in each line. Line-specific ectopic expression was also observed. However, the sensitivity to 17-beta estradiol did not differ among transgenic lines. Three transgenic lines are considered to be suitable as bio-indicators of estrogenic activity, due to the ease of observing green fluorescence in their livers. The transgenic lines can also detect the estrogenic activity of testosterone and 17-beta trenbolone at the nominal concentration of 30 and 100 microg/l, respectively.
Collapse
Affiliation(s)
- Kanta Kurauchi
- Department of Applied Biosciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa oiwake-chou, Sakyo-ku, Kyoto 606-8502, Japan
| | | | | |
Collapse
|
27
|
Salam MA, Sawada T, Ohya T, Ninomiya K, Hayashi S. Detection of environmental estrogenicity using transgenic medaka hatchlings (Oryzias latipes) expressing the GFP-tagged choriogenin L gene. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2008; 43:272-277. [PMID: 18205058 DOI: 10.1080/10934520701792761] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The discharge of environmental estrogenic substances into the environment has an adverse effect on human and wildlife, especially aquatic organisms. Therefore, a simple, practical and sensitive method of detecting environmental estrogenicity is required. Previously, we established a transgenic medaka (Oryzias latipes) strain harboring choriogenin L (ChgL) tagged with green fluorescence protein (GFP), which is expressed in the liver in response to estrogen (E2). This strain of medaka could be a very useful tool in detecting aquatic estrogenicity. The appropriate conditions for analysis of estrogenicity were determined at various E2 concentrations, exposure periods and the developmental stages of medaka hatchlings. Furthermore, the relationship between E2 concentrations and GFP fluorescence intensity was investigated. It was found that fluorescence intensity of GFP depends largely on E2 concentration, exposure time and developmental stage. Hatchling at 4-day post-hatch (DPH) showed optimum conditions for exposure to E2 with optimum GFP intensity at 9 DPH. Additionally, the exposure period was optimized so that exposure from 4 DPH for 5 days showed a significant change in GFP intensity. E2 concentrations of 0, 12.5, 25, 50 and 100 ng/L were used, with 25 ng/L showing a clear increase in GFP intensity at day 6 of exposure. The sensitivity of vitellogenin (Vtg) induction was also examined by Western blot and enzyme-linked immunosorbent assay (ELISA) using whole-body homogenates of E2-exposed (0, 12.5, 25, 50 and 100 ng/L) juvenile medaka. Vitellogenin induction, as determined by Western blot, was found in those juveniles exposed to E2 at a concentration of 100 ng/L. Whereas, Vtg induction was detected by ELISA from juveniles exposed to 12.5 ng/L of E2. The results suggest that ChgL-GFP transgenic medaka could be a simple and practical tool in detecting environmental estrogenicity considering the actual concentrations of estrogenic activity in contaminated and/or wastewater.
Collapse
Affiliation(s)
- Md A Salam
- Department of Zoology, Jahangirnagar University, Savar, Dhaka, Bangladesh.
| | | | | | | | | |
Collapse
|
28
|
Selected papers on zebrafish and other aquarium fish models. Zebrafish 2008; 1:165-72. [PMID: 18248227 DOI: 10.1089/zeb.2004.1.165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
29
|
Liu X, Wang H, Gong Z. Tandem-Repeated Zebrafish zp3 Genes Possess Oocyte-Specific Promoters and Are Insensitive to Estrogen Induction1. Biol Reprod 2006; 74:1016-25. [PMID: 16481590 DOI: 10.1095/biolreprod.105.049403] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Zona pellucida (Zp) proteins are glycoproteins in fish chorion and are encoded by multiple gene families, including zp1, zp2, zp3, and potentially other zp genes. Expression of zp genes in teleosts is either in the liver under the induction of estrogen or in the ovaries. In the present study, we isolated and characterized a zebrafish zp3 genomic clone and found three tandem-repeated zp3 genes with high sequence identities. We estimated that there were 10-15 zp2 and 17-21 zp3 genes in a haploid genome. We also found some variant zp2 and zp3 subfamilies, and each subfamily may have multiple members. These zp2 and zp3 genes are distributed in several different chromosomes. Ontogenetic expression of zp2 and zp3 mRNAs was first detected at 3 wk postfertilization, which was about 5 wk earlier than initial vtg1 expression, indicating that ovary development was earlier than vitellogenesis. Both zp2 and zp3 mRNAs were expressed specifically in early-growing oocytes and are insensitive to estrogen induction. Because zp3 genes are organized in tandem repeats, to investigate whether an individual zp3 promoter is capable of driving oocyte-specific expression, green fluorescence protein (gfp)-transgenic zebrafish were developed by using a 3.8-kb zp3 5' upstream region, and we found that the gfp reporter gene was faithfully expressed in developing oocytes in zp3:gfp transgenic females. Thus, the new transgenic line not only provided a convenient living marker for monitoring female gonad development, but also demonstrated that a single zp3 gene promoter is sufficient for oocyte-specific transcription.
Collapse
Affiliation(s)
- Xingjun Liu
- Department of Biological Sciences, National University of Singapore, Singapore 119260
| | | | | |
Collapse
|
30
|
Yu RMK, Wong MML, Kong RYC, Wu RSS, Cheng SH. Induction of hepatic choriogenin mRNA expression in male marine medaka: a highly sensitive biomarker for environmental estrogens. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2006; 77:348-58. [PMID: 16464508 DOI: 10.1016/j.aquatox.2006.01.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2005] [Revised: 01/09/2006] [Accepted: 01/09/2006] [Indexed: 05/06/2023]
Abstract
Teleost choriogenins, precursors of the inner layer subunits of egg envelope, have been recently introduced as sensitive biomarkers for exposure to estrogenic compounds. In this study, two full-length cDNAs-ojChgH and ojChgL which encode the choriogenin H and L forms, respectively, were cloned from the marine medaka, Oryzias javanicus. The deduced protein sequences of ojChgH and ojChgL are highly similar to the corresponding homologues in the freshwater medaka (O. latipes) with identities of 77.2 and 87.6%, respectively. Phylogenetic analysis indicated that ojChgH and ojChgL are members of two different classes of liver-specific ZP-domain containing proteins (ZPB and ZPC, respectively). Computer analysis of ca. 2 kb of the 5'-flanking sequences of ojChgH and ojChgL revealed that both genes contain a number of putative estrogen response elements (EREs) and/or half-site EREs. In vivo mRNA expression patterns of the genes were examined by quantitative real-time RT-PCR. ojChgH is expressed exclusively in the liver while ojChgL is co-expressed in the liver (major) and ovary (minor). Exposure of fish to waterborne 17beta-estradiol (E2) at environmentally relevant concentrations (1, 5, 10 and 100 ng/L) resulted in dose-dependent induction of both genes in the liver, with higher sensitivity and magnitude of induction in males than in females. In the male liver, induction of ojChgH is more sensitive to E2 than that of ojChgL and two other estrogen-responsive genes, estrogen receptor alpha (ojERalpha) and vitellogenin (ojVTG). The lowest-observed-effect concentration (LOEC) of E2 on induction of hepatic ojChgH mRNA is 1 ng/L. In the ovary, expression of ojChgL is non-responsive to E2 treatment. In conclusion, the present study suggested that induction of hepatic ojChgH mRNA in male fish may be a highly sensitive biomarker for exposure to environmental estrogens.
Collapse
Affiliation(s)
- Richard Man Kit Yu
- Department of Biology and Chemistry, Centre for Marine Environmental Research and Innovative Technology, MERIT, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong
| | | | | | | | | |
Collapse
|
31
|
Zeng Z, Liu X, Seebah S, Gong Z. Faithful expression of living color reporter genes in transgenic medaka under two tissue-specific zebrafish promoters. Dev Dyn 2005; 234:387-92. [PMID: 16124005 DOI: 10.1002/dvdy.20491] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
To test tissue specificity of zebrafish gene promoters in a heterologous fish species, two transgenic medaka lines under two zebrafish promoters were generated. Under the zebrafish skeletal muscle-specific mylz2 promoter, transgenic medaka expressed green fluorescent protein (GFP) exclusively in skeletal muscles, mimicking the endogenous medaka mylz2 mRNA expression and also identical to GFP expression in mylz2:gfp transgenic zebrafish. A madaka mylz2 promoter was also capable of directing skeletal muscle-specific GFP expression in transient transgenic zebrafish embryos. In the krt8:rfp transgenic medaka line with the zebrafish epithelial krt8 promoter, red fluorescent protein was specifically expressed in the skin epithelia as well as the epithelial lining cells of the anterior digestive tract, which was also identical to GFP expression in krt8:gfp transgenic zebrafish. Therefore, the two zebrafish promoters faithfully function in a heterologous fish species, and it is likely that the mechanisms of tissue-specific expression are largely conserved among fish species.
Collapse
Affiliation(s)
- Zhiqiang Zeng
- Department of Biological Sciences, National University of Singapore, Singapore
| | | | | | | |
Collapse
|
32
|
Kurauchi K, Nakaguchi Y, Tsutsumi M, Hori H, Kurihara R, Hashimoto S, Ohnuma R, Yamamoto Y, Matsuoka S, Kawai S, Hirata T, Kinoshita M. In vivo visual reporter system for detection of estrogen-like substances by transgenic medaka. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2005; 39:2762-8. [PMID: 15884374 DOI: 10.1021/es0486465] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Detection of endocrine disrupting chemicals, in particular, environmental estrogens with living organisms, has many advantages if compared to chemical analysis. The screening of novel pollutants with meaningful endpoints, the integration of uptake, bioconcentration, and excretion as well as the evaluation of endocrine disrupting effects with respect to toxicity require in vivo biotests for estrogen-like substances (ELSs). Critical disadvantages of whole organism biotests are their low sensitivity and the need for laborious and time-consuming work. To overcome these problems, we have developed a transgenic medaka strain harboring the green fluorescence protein (GFP) gene driven by choriogenin H gene regulatory elements. Choriogenin H is an egg envelope protein induced by estrogens in the liver. With yolk sac larvae of this strain, GFP induction in liver was observed 24 h after onset of aqueous exposure to 0.63 nM 17beta-estradiol (E2), 0.34 nM ethynylestradiol, or 14.8 nM estrone. Furthermore, concentrated sewage treatment effluent induced GFP expression. Comparison of E2 equivalents estimated by GFP-induction in transgenic medaka, a YES assay, and GC/MS showed detection limits in the same order of magnitude. These results indicated that the sensitivity of the transgenic medaka strain was sufficient for application as an alternative model in monitoring environmental water samples for ELSs.
Collapse
Affiliation(s)
- Kanta Kurauchi
- Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|