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Citation
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HERO ID
6553662
Reference Type
Journal Article
Title
Expression of gonadotropin subunit genes following 4-nonylphenol exposure in masu salmon: effects on transcript levels and promoter activities via estrogen receptor alpha
Author(s)
Maeng, S; Jung, Y; Choi, E; Jeon, JK; Kim, S; Gen, K; Sohn, YC
Year
2005
Is Peer Reviewed?
Yes
Journal
Comparative Biochemistry and Physiology - Part B: Biochemistry and Molecular Biology
ISSN:
1096-4959
EISSN:
1879-1107
Volume
142
Issue
4
Page Numbers
383-390
Language
English
PMID
16203166
DOI
10.1016/j.cbpb.2005.08.009
Web of Science Id
WOS:000233799400004
Abstract
The 4-nonylphenol (NP) group is classified as some of the most potent endocrine disrupting chemicals (EDCs) reported to have estrogenic effects on reproductive endocrine system in vertebrates. In the present study, we investigated the effect of NP on expression of gonadotropin (GTH) subunit genes in masu salmon (Oncorhynchus masou) to clarify pituitary-based reproductive impact by EDCs. Female juvenile fish were injected with NP (a mixture of ring and chain isomers; 10 or 50 mg kg(-1) body weight) and maintained for 3 days post-injection. A semi-quantitative reverse transcription-polymerase chain reaction was used to analyze the pituitary GTHalpha, follicle-stimulating hormone beta (FSHbeta), and luteinizing hormone beta (LHbeta), and hepatic vitellogenin (VTG) mRNA levels. A low dose of NP induced the GTHalpha and LHbeta mRNA levels. High dose of NP slightly reduced FSHbeta mRNA levels in contrast to increased VTG mRNA levels. In a promoter study, NP (1-10 nM) increased the activities of luciferase reporter gene located downstream of masu salmon GTHalpha or LHbeta 5'-flanking region depending on the estrogen receptor alpha (ERalpha) in transiently transfected mammalian cells. In contrast, the luciferase activity of FSHbeta was elevated by NP in an ERalpha-independent manner. These results suggest that GTH subunit gene expression of masu salmon may be affected by EDCs at the transcription level and that the genes are useful markers for pituitary effects of xenoestrogens.
Keywords
GTH; FSH; LH; Promoter; Gene expression; Transcription; Nonylphenol; Estrogen; Xenoestrogen; Masu salmon
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