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Effects of Nonylphenol and 2,2', 4,6,6'-pentachlorobiphenyl on in vitro Sex Steroid Production in Maturing Oocytes of the Yellowfin Goby, Acanthogobius flavimanus

  • Baek, Hea-Ja (Department of Marine Biology, Pukyong National Universtiy) ;
  • Hwang, In-Joon (Department of Marine Biology, Pukyong National Universtiy) ;
  • Park, Myoung-Hee (Department of Marine Biology, Pukyong National Universtiy) ;
  • Kim, Hyung-Bae (Department of Marine Bio-resources, Gangwon Provincial University)
  • Published : 2009.12.31

Abstract

Several studies have reported that nonylphenol (NP) and 2,2', 4,6,6'-pentachlorobiphenyl (PCB104) exhibit estrogenic activity. To investigate the estrogenic potency of NP and PCB104 during oocyte maturation, fully vitellogenic oocytes (0.76 mm diameter in average) of yellow fin goby, Acanthogobius flavimanus, were exposed in vitro to these chemicals at different concentrations (0.1, 1, 10, 100, and 1,000 ng/mL) with the exogenous precursor $17\alpha$-hydroxyprogesterone ($17{\alpha}OHP$) 50 ng/mL in the presence or absence of human chorionic gonadotropin (HCG). The production of testosterone (T), estradiol-$17\beta$ (E2), and $17\alpha,20\beta$-dihydroxy-4-pregnen-3-one ($17\alpha20{\beta}OHP$) in response to NP or PCB104 were measured by radioimmunoassay. Steroid levels were also expressed as E2/T and E2/$17\alpha20{\beta}OHP$ ratios. In the absence of HCG, no significant differences in either NP or PCB104 treatment groups were observed. In the presence of HCG, NP treatment did not show significant differences in the production of T, E2, and $17\alpha20{\beta}OHP$ at any concentrations tested, but E2/T ratios were decreased at concentrations of 0.1, 1, 10, and 1,000 ng/mL compared with the control group. PCB104 decreased E2 production at concentrations of 0.1, 10, and 1000 ng/mL, but did not show significant differences in the production of T and $17\alpha20{\beta}OHP$ at any concentration tested. While E2/T ratios were decreased at PCB104 concentrations of 0.1, 1, 10, and 1,000 ng/mL, E2/$17\alpha20{\beta}OHP$ ratios were also decreased at 0.1, 10, and 1,000 ng/mL compared with the control. Results indicate that both NP and PCB104 appeared to have antiestrogenic effects during this phase.

Keywords

References

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