Feminization, altered gonadal development, and liver damage in least killifish (Heterandria formosa) exposed to sublethal concentrations of 17α-ethinylestradiol
| Autor: | Latonya M. Jackson, Bruce E. Felgenhauer, Paul L. Klerks |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Male
Health Toxicology and Mutagenesis media_common.quotation_subject Feminization (biology) 0211 other engineering and technologies Disorders of Sex Development Zoology 02 engineering and technology 010501 environmental sciences Endocrine Disruptors Ethinyl Estradiol 01 natural sciences Oogenesis Aquatic toxicology Cyprinodontiformes Endocrine system Animals Feminization Killifish Gonads 0105 earth and related environmental sciences media_common 021110 strategic defence & security studies biology Reproduction Public Health Environmental and Occupational Health General Medicine biology.organism_classification Pollution Liver Heterandria formosa Female Development of the gonads Water Pollutants Chemical |
| Zdroj: | Ecotoxicology and environmental safety. 170 |
| ISSN: | 1090-2414 |
| Popis: | The widespread use of the synthetic estrogen 17 α-ethinylestradiol (EE2) has resulted in elevated levels in aquatic environments, where it is known to act as an endocrine disrupting chemical affecting fish and other aquatic organisms. Examining changes in the structure of the fish’ gonads and liver has proven to be an effective approach for assessing these impacts. While changes have been reported for various fish species, it is not clear whether impacts are equally severe in live-bearing fishes. The present study looked at gonadal and liver development in EE2-exposed least killifish (Heterandria formosa), a live-bearing Poeciliid. Exposures to 0, 5, or 25 ng/L EE2 began within six days of birth and continued until fish became sexually mature 12–23 weeks later. Exposure to 5 ng/L EE2 resulted in severe intersex in fish with external male characteristics, a slowdown of spermatogenesis in these intersex fish and a slowdown of oogenesis in the female fish. Moreover, these fish had a variety of liver injuries. Fish exposed to 25 ng/L EE2 exhibited intersex but at a lower frequency than occurred at 5 ng/L. In contrast, liver damage and slowdown of both oogenesis and spermatogenesis exhibited the typical dose-dependence. These findings illustrate the importance of including histological analyses when assessing endocrine disruption in fish, demonstrate that the live-bearing mode of reproduction appears to provide limited protection from the effects of waterborne EE2, and provide further evidence that EE2 has multiple impacts on fish health and reproduction that are severe enough to potentially affect fish populations. |
| Databáze: | OpenAIRE |
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