Effects of the commercial antiandrogen flutamide on the biomarkers of reproduction in male Murray rainbowfish (Melanotaenia fluviatilis)

Harpreet Bhatia, Anupama Kumar, Yukiko Ogino, Jun Du, Adrienne Gregg, John Chapman, Mike J. Mclaughlin, Taisen Iguchi

研究成果: Contribution to journalArticle査読

19 被引用数 (Scopus)

抄録

The endocrine responses in male Murray rainbowfish (Melanotaenia fluviatilis) were evaluated after exposures to biologically active concentrations of the nonsteroidal pharmaceutical, flutamide. Fish were exposed to nominal concentrations of 125μg/L, 250μg/L, 500μg/L, and 1000μg/L of flutamide for 7 d, after which plasma vitellogenin concentration; brain aromatase activity; and hepatic expression of the genes for vitellogenin, choriogenin, and androgen and estrogen receptors were assessed. Qualitative assessment of the testes of the fish exposed to flutamide exhibited hindrance in the transformation of spermatogonia to spermatozoa and increased testicular anomalies, such as multinucleated and pyknotic cells and interstitial fibrosis. An increase in the hepatosomatic index with respect to the controls was noted after treating the fish with flutamide at all concentrations. Vitellogenin was induced in plasma in the 1000μg/L flutamide group. The activity of aromatase in the brain declined significantly after exposures to flutamide at all concentrations. Males exposed to 1000μg/L of flutamide showed a downregulation in the genes encoding androgen receptors α and β. The expression of the gene for the estrogen receptor α was induced and of vitellogenin was downregulated after treatment with 250μg/L to 1000μg/L of flutamide. The results suggest that 7-d exposures to 125μg/L to 1000μg/L flutamide can impair the reproductive endocrine system in male Murray rainbowfish at multiple levels by an antiandrogenic mode of action.

本文言語英語
ページ(範囲)1098-1107
ページ数10
ジャーナルEnvironmental Toxicology and Chemistry
33
5
DOI
出版ステータス出版済み - 1 1 2014
外部発表はい

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis

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