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Gene expression profiles in the testis associated with testis-ova in adult Japanese medaka (Oryziaslatipes) exposed to 17α-ethinylestradiol.

Abstract：

:The occurrence of oocytes in the testis (testis-ova) of several fish species is often associated with exposure of estrogenic chemicals. However, induction mechanisms of the testis-ova remain to be elucidated. To develop marker genes for detecting testis-ova in the testis, adult male medaka were exposed to nominal concentration of 100 ng L(-1) of 17α-ethinylestradiol (EE2) for 3-5 weeks, and 800 ng estradiol benzoate (EB) for 3 weeks (experiment I), and a measured concentration of 20 ng L(-1) EE2 for 1-6 weeks (experiment II). Histological analysis was performed for the testis, and microarray analyses were performed for the testis, liver and brain. Microarray analysis in the estrogen-exposed medaka liver showed vitellogenin and choriogenin as estrogen responsive genes. Testis-ova were induced in the testis after 4 weeks of exposure to 100 ng L(-1) EE2, 3 weeks of exposure to 800 ng EB, and 6 weeks of exposure to 20 ng L(-1) EE2. Microarray analysis of estrogen-exposed testes revealed up-regulation of genes related to zona pellucida (ZP) and the oocytes marker gene, 42Sp50. Using quantitative RT-PCR we confirmed that Zpc5 gene can be used as a marker for the detection of testis-ova in male medaka.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Hirakawa I,Miyagawa S,Katsu Y,Kagami Y,Tatarazako N,Kobayashi T,Kusano T,Mizutani T,Ogino Y,Takeuchi T,Ohta Y,Iguchi T

doi

10.1016/j.chemosphere.2011.12.047

subject

Has Abstract

pub_date

2012-05-01 00:00:00

pages

668-74

issue

7

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(11)01416-0

journal_volume

87

pub_type

杂志文章

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