Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Effect of Bisphenol A on Early Embryonic Development and the Expression of Glutathione S-transferase (GST) in the Sea Urchin (Hemicentrotus pulcherrimus)

말똥성게(Hemicentrotus pulcherrimus)의 초기배아 발생과 glutathione S-transferase (GST)의 발현에 대한 bisphenol A의 영향

  • Hwang, Un-Ki (National Fisheries Research & Development Institute, West Sea Fisheries Research Institute, Marine Ecological Risk Assessment Center) ;
  • Kim, Dae-Han (National Fisheries Research & Development Institute, West Sea Fisheries Research Institute, Marine Ecological Risk Assessment Center) ;
  • Ryu, Hyang-Mi (National Fisheries Research & Development Institute, West Sea Fisheries Research Institute, Marine Ecological Risk Assessment Center) ;
  • Lee, Ju-Wook (National Fisheries Research & Development Institute, West Sea Fisheries Research Institute, Marine Ecological Risk Assessment Center) ;
  • Park, Seung-Yoon (National Fisheries Research & Development Institute, West Sea Fisheries Research Institute, Marine Ecological Risk Assessment Center) ;
  • Kang, Han Seung (National Fisheries Research & Development Institute, West Sea Fisheries Research Institute, Marine Ecological Risk Assessment Center)
  • 황운기 (국립수산과학원 서해수산연구소 해양생태위해평가센터) ;
  • 김대한 (국립수산과학원 서해수산연구소 해양생태위해평가센터) ;
  • 류향미 (국립수산과학원 서해수산연구소 해양생태위해평가센터) ;
  • 이주욱 (국립수산과학원 서해수산연구소 해양생태위해평가센터) ;
  • 박승윤 (국립수산과학원 서해수산연구소 해양생태위해평가센터) ;
  • 강한승 (국립수산과학원 서해수산연구소 해양생태위해평가센터)
  • Received : 2014.06.13
  • Accepted : 2014.09.12
  • Published : 2014.09.30
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Abstract

In this study, gametotoxicity and embryotoxicity experiments using Hemicentrotus pulcherrimus were carried out to investigate the ecotoxicological effects of bisphenol A (BPA). We examined the effects of BPA on fertilization and normal embryogenesis at various concentrations (0, 300, 500, 800, 1000, and 1500 ppb). The results demonstrated that the fertilization rates were not changed. The normal embryogenesis rates were gradually decreased in a dose-dependent manner, and were significantly lowered following 800 ppb BPA treatment ($EC_{50}$=1056.1 ppb, 95% Cl=981.8~1163.9 ppb). The observed effective concentration and the lowest observed effective concentration of the normal embryogenesis rate were 500 ppb and 800 ppb, respectively. The embryos showed retarded development at each tested concentration, indicating the fact the embryonic development was delayed due to the increasing concentrations of BPA. Furthermore, we examined the expression of glutathione S-transferase (GST) mRNA at various concentrations of BPA in H. pulcherrimus. Interestingly, it was found that the expression level of GST mRNA was significantly increased in the experimental group exposed to BPA. Based on these results, we suggested that BPA at greater than 800 ppb has a toxic effect during the early embryonic stages of H. pulcherrimus, and GST mRNA may be used as a biomarker for risk assessment of BPA contamination.

본 연구는 시험생물로서 말똥성게 (Hemicentrotus pulcherrimus)를 이용하여 내분비계장애물질인 bisphenol A(BPA)의 독성 및 시험생물로서의 적합성 등을 조사하였다. 말똥성게(H. pulcherrimus)의 수정 및 정상 배아발생에 미치는 BPA의 독성을 보기 위하여 농도(0, 300, 500, 800, 1000, 1500 ppb)에서 조사하였다. BPA 노출 시 수정률은 시험구간 내의 BPA 처리농도와 관계없이 유의적인 변화가 없었다. 정상 배아발생률은 BPA 농도가 높을수록 유의적인 감소를 나타냈으며, 800 ppb 농도부터 유의적인 감소를 보였다. 정상배아발생에 대한 독성값은 반수영향농도 ($EC_{50}$) 1056.1 ppb, 95% Cl 981.8~1163.9 ppb로 나타났다. 또한 무영향농도 (NOEC)와 최소영향농도(LOEC)는 500 ppb 및 800 ppb로 나타났다. BPA에 노출된 배아는 농도가 증가함에 따라 발생이 정체되는 현상이 나타났다. BPA에 노출된 pluteus 유생을 이용한 glutathione-S-transferase (GST) 유전자의 발현을 비교해본 결과 GST 유전자의 발현은 농도가 증가함에 따라 발현이 증가하였다. 본 연구 결과, 말똥성게 (H. pulcherrimus)의 초기 배아 발생 과정 중 800 ppb 이상에서 독성을 나타냈으며 GST 유전자는 BPA 노출에 따른 위해성 평가에 생체지표유전자로 유용하게 이용될 수 있다고 생각된다.

Keywords

References

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