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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] [What about the content of this article? (0)] [Affiliation(s)] [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.
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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.
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