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Evaluation of the effects of ethinylestradiol on sexual differentiation in the olvas-GFP/STII-YI medaka (transgenic Oryzias latipes) strain as estimated by proliferative activity of germ cells.
MedLine Citation:
PMID:  21635865     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We evaluated the effects of 17(-ethinylestradiol (EE(2)) on sexual differentiation in transgenic olvas-GFP/STII-YI medaka (Oryzias latipes) in terms of the proliferative activity of germ cells. This strain contains the green fluorescent protein (GFP) gene fused to the regulatory region of the medaka vasa gene, and germ cell-specific expression of GFP can be visualized in living (transparent) individuals. From 0 days post-hatch (0dph) onwards, juveniles were exposed to graded concentrations of EE(2) (25.2-1710ng/L) for 35 days. The gonads of live specimens were monitored by measuring their size and calculating their GFP-fluorescence area. GFP-fluorescent area in control females was about 10 times that in control males at 10 days posthatch (dph) whereas the gonadal size of 10dph males that had been exposed to 158ng/L of EE(2) significantly increased up to twice the size of control males, indicating that abnormal sexual differentiation towards female might occur in these individuals. Histological examination and identification of the sex-linked marker SL1 indicated that male to female sex reversal occurred at EE(2) exposure ≥45.1ng/L at 35dph. These results suggest that observation of proliferative activity of germ cells in the olvas-GFP/STII-YI strain could be applied to facilitated screening fish model to detect adverse effects on sexual differentiation as early as 10dph juveniles.
Authors:
Takeshi Hano; Yuji Oshima; Masato Kinoshita; Minoru Tanaka; Noriko Mishima; Yuko Wakamatsu; Kenjiro Ozato; Yohei Shimasaki; Tsuneo Honjo
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-30
Journal Detail:
Title:  Aquatic toxicology (Amsterdam, Netherlands)     Volume:  104     ISSN:  1879-1514     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-6-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8500246     Medline TA:  Aquat Toxicol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  177-184     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier B.V. All rights reserved.
Affiliation:
National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, 2-17-5 Maruishi, Hatsukaichi, Hiroshima 739-0452, Japan; Laboratory of Marine Environmental Science, Faculty of Agriculture, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan.
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