Waterborne exposure to fluorotelomer alcohol 6:2 FTOH alters plasma sex hormone and gene transcription in the hypothalamic-pituitary-gonadal (HPG) axis of zebrafish

Chunsheng LIU, Liqin YU, Jun DENG, Paul K. S. LAM, Shiu Sun Rudolf WU, Bingsheng ZHOU

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66 Citations (Scopus)

Abstract

Fluorotelomer alcohols (FTOHs) have shown estrogenic activity in vitro and in vivo, but the mechanism of this activity is not known. In this study, 18-week-old zebrafish (Danio rerio) were exposed to 0, 0.03, 0.3 and 3.0 mg/l 1H,1H,2H,2H-perfluorooctan-1-ol (6:2 FTOH) for 7 days, and the effects on plasma sex hormone levels were measured followed by use of real-time PCR to examine selected gene expression in hypothalamic-pituitary-gonadal (HPG) axis and liver. Exposure to 6:2 FTOH significantly increased plasma estradiol (E2) and testosterone (T) levels in both males and females. Furthermore, the ratio of T/E2 was reduced in females while increased in males. In females, the increase of E2 was accompanied by up-regulated hepatic estrogenic receptor α (ERα) and vitellogenin (VTG1 and VTG3) expression. In males, the elevation of the T level is consistent with the up-regulation of cytochrome P450 c17α-hydroxylase, 17, 20-lase (CYP17) and the down-regulation of cytochrome P450 aromatase A (CYP19A). The present study demonstrated that waterborne exposure to 6:2 FTOH alter plasma sex hormone levels and the ratio of T/E2, as well as the transcriptional profiles of some genes in the HPG axis and liver. The results suggested that FTOHs may disturb fish reproduction through endocrine disrupted activity. Copyright © 2009 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)131-137
JournalAquatic Toxicology
Volume93
Issue number2-3
DOIs
Publication statusPublished - 28 Jun 2009

Citation

Liu, C., Yu, L., Deng, J., Lam, P. K. S., Wu, R. S. S., & Zhou, B. (2009). Waterborne exposure to fluorotelomer alcohol 6:2 FTOH alters plasma sex hormone and gene transcription in the hypothalamic-pituitary-gonadal (HPG) axis of zebrafish. Aquatic Toxicology, 93(2-3), 131-137. doi: 10.1016/j.aquatox.2009.04.005

Keywords

  • Fluorotelomer alcohols
  • Hypothalamic–pituitary–gonadal (HPG) axis
  • Gene transcription
  • Sex hormone
  • Endocrine disruption

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