Abstract：
:The fertilized eggs of Japanese medaka (Oryzias latipes) were exposed to estrone (E1) at 5-5000 ng L(-1) for 15 d, and the hatched fry were exposed continuously to the same concentrations for the additional 15 d. Adverse effects on hatchability, time to hatching, and gross abnormalities occurred at 50 ng L(-1) or above. Then the fry were divided into a continual exposure group, and a water recovery group. When the fry were exposed to E1 for another 60 d, there was a decrease in the hepatosomatic index (HSI) of males and the influence disappeared in the water recovery group. The gonadosonatic index (GSI) of females at 500 ng L(-1) decreased significantly in another 60 d exposure. While the fry were maintained in dechlorinated tap water for 60 d, a significant decrease in female GSI was observed at 50 ng L(-1) or above. An increased GSI was found in males in both continual exposure and water recovery groups at all E1 treatments. Quantitative RT-PCR showed that vitellogenin-I (Vtg-I) gene expressions in the female liver were significantly down-regulated at 50 ng L(-1) in the continual exposure group, and at 500 ng L(-1) in the water recovery group, while male Vtg-I genes were significantly up-regulated for all E1 treatments. In addition, all E1 treatments caused sex reversal of males. These results suggest that E1 at 5 ng L(-1) or above have unrecoverable impacts on the gonadal growth and development of medaka, even if only early life stages were exposed to E1.
journal_name
Chemospherejournal_title
Chemosphereauthors
Lei B,Wen Y,Wang X,Zha J,Li W,Wang Z,Sun Y,Kang J,Wang Ydoi
10.1016/j.chemosphere.2013.06.025subject
Has Abstractpub_date
2013-10-01 00:00:00pages
1104-10issue
6eissn
0045-6535issn
1879-1298pii
S0045-6535(13)00857-6journal_volume
93pub_type
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