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In ovo exposure quail assay for risk assessment of endocrine disrupting chemicals

  • Reproductive Toxicology
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Abstract

Although there are in vivo assays using various organisms for the risk assessment of chemicals with endocrine disrupting properties, effective experimental methods for avian species are still under debate. We have developed an in ovo exposure assay using Japanese quail eggs, aimed at assessing disrupting effects on avian reproductive development and function. Hybrid eggs from Brazilian Brown male and White Egg female quails, which can be genetically sexed by their plumage color after hatching, were prepared, and test materials dissolved in olive oil were injected into the air-chamber on day 10 of incubation. After sexual maturation of hatched chicks, we observed egg production by females and the egg quality and male-typical reproductive behavior, and then examined reproductive system morphology and serum steroid concentrations in both sexes. Treatment with a synthetic estrogen, diethylstilbestrol (DES, 0.5–50 ng/g egg), dose-dependently reduced the eggshell thickness and strength of eggs. A few females treated with 5 ng/g DES per egg produced soft-shelled/unmarked eggs, and all laying females treated with 50 ng/g egg produced eggs completely lacking shells. DES also induced shortening of the left oviduct and abnormal development of the right oviduct in a dose-dependent manner, while testis weight was reduced symmetrically. In addition, 2,2′,4′,6′-tetrachlorobiphenyl-4-ol (10–1,000 ng/g egg), which previously showed relatively high estrogenic activity in vitro, caused dose-dependent shortening of the left oviduct and reduction in testis weight. The methods for evaluating endocrine disrupting effects and preparing experimental birds proposed in the present study are expected to facilitate assays for avian reproductive toxicology.

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Acknowledgements

The authors thank Dr. John S. Edmonds for helpful comments on the manuscript and Mr. Toshiaki Ito, Ms. Kaori Morohoshi, Ms. Miho Yamazaki, Ms. Mariko Katsu and Ms. Ryoko Abe for skilful technical assistance. This study was performed in conformity with the “Law for the Humane Treatment and Management of Animals” in Japan.

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Correspondence to Ryo Kamata.

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Kamata, R., Takahashi, S., Shimizu, A. et al. In ovo exposure quail assay for risk assessment of endocrine disrupting chemicals. Arch Toxicol 80, 857–867 (2006). https://doi.org/10.1007/s00204-006-0113-1

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  • DOI: https://doi.org/10.1007/s00204-006-0113-1

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