期刊
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
卷 31, 期 9, 页码 2069-2077出版社
WILEY-BLACKWELL
DOI: 10.1002/etc.1919
关键词
P450 aromatase; Sex steroid receptor; Sperm; Steroidogenic acute regulatory protein; Vitellogenin
资金
- Grant Agency of the Czech Republic [523/09/1793, P503/12/1834]
- CENAKVA [CZ.1.05/2.1.00/01.0024]
- Grant Agency of the University of South Bohemia [047/2010/Z, 046/2010/Z]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
Adverse effects of bisphenol A (BPA) on reproductive physiology were studied in male goldfish (Carassius auratus) exposed to nominal environmentally relevant concentrations (0.2 and 20?mu g/L) for up to 90 d. Transcriptions of various reproductive genes were measured in brain, liver, and testis to investigate the BPA modes of action. Volume, density, total number, motility, and velocity of sperm were measured to assess testicular function. At 0.2?mu g/L, BPA reduced steroidogenetic acute regulatory protein and increased estrogen receptors (ERs) messenger RNA (mRNA) transcript (ER beta 1 in liver and ER beta 2 in testis) after 90 d. At 20?mu g/L, BPA increased mRNA transcript of androgen receptor in testis, brain- and testis-specific aromatase, and vitellogenin in liver after 90, 30, 60, and 60 d, respectively. Transcripts of ERs mRNA were increased after 30 to 60 d at 20?mu g/L BPA; increase in ER beta 1 mRNA was observed in testis after 7 d. Total number, volume, and motility of sperm were decreased in males exposed to 0.2 and 20?mu g/L BPA, whereas sperm density and velocity were only reduced at 20?mu g/L BPA. The results support the hypothesis that BPA may exert both anti-androgenic and estrogenic effects, depending on concentration, leading to diminished sperm quality. The findings provide a framework for better understanding of the mechanisms mediating adverse reproductive actions of BPA observed in different parts of the world. Environ. Toxicol. Chem. 2012; 31: 20692077. (c) 2012 SETAC
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