Shved, Natallia; Berishvili, Giorgi; Baroiller, Jean-François; Segner, Helmut; Reinecke, Manfred (2008). Environmentally Relevant Concentrations of 17α-Ethinylestradiol (EE2) Interfere With the Growth Hormone (GH)/Insulin-Like Growth Factor (IGF)-I System in Developing Bony Fish. Toxicological sciences, 106(1), pp. 93-102. Oxford University Press 10.1093/toxsci/kfn150
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The aim of this study was to evaluate whether effects of environmental estrogens on fish growth and reproduction may be mediated via modulating the growth hormone (GH)/insulin-like growth factor I (IGF-I) system. To this end, developing male and female monosex populations of tilapia were exposed to 17α-ethinylestradiol (EE2) at 5 and 25 ng EE2/l water from 10-day postfertilization (DPF) until 100 DPF. Under exposure to both EE2 concentrations, sex ratio shifted toward more females and body length, and weight were significantly reduced in males. The growth-reducing effect was associated with significant changes in hepatic IGF-I expression, both in males and females and with significant alterations of IGF-I mRNA and GH mRNA in the brain. The changes in IGF-I and GH mRNA were accompanied by altered estrogen receptor α (ERα) expression in brain and liver. These findings point to an influence of estrogenic exposure on the endocrine GH/IGF-I axis. In addition, the EE2 treatment resulted in significant changes of ERα and IGF-I expression in ovaries and testis, suggesting that the estrogens interact not only with the endocrine but also with the autocrine/paracrine part of the IGF-I system. Overall, our results provide evidence that EE2 at environmentally relevant concentrations is able to interfere with the GH/IGF-I system in bony fish and that the impairing effects of estrogens reported on fish growth and reproductive functions may rather result from a cross talk between the sex steroid and the IGF-I system than be toxicological.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
05 Veterinary Medicine > Department of Infectious Diseases and Pathobiology (DIP) > Institute for Fish and Wildlife Health (FIWI) |
UniBE Contributor: |
Segner, Helmut |
Subjects: |
600 Technology > 630 Agriculture |
ISSN: |
1096-6080 |
Publisher: |
Oxford University Press |
Language: |
English |
Submitter: |
Marceline Brodmann |
Date Deposited: |
05 Aug 2020 08:27 |
Last Modified: |
05 Dec 2022 15:13 |
Publisher DOI: |
10.1093/toxsci/kfn150 |
BORIS DOI: |
10.7892/boris.115139 |
URI: |
https://boris.unibe.ch/id/eprint/115139 |
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