Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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Toxicity Evaluation of Chemicals using Asian Toad Embryos, Bufo gargarizans

두꺼비 배아를 활용한 화학물질의 독성평가 연구

  • Ko, Sun-kun (Dept. of Physical theraphy, Honam Univ.)
  • 고선근 (호남대학교 물리치료학과)
  • Received : 2016.06.08
  • Accepted : 2016.08.29
  • Published : 2016.08.30
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Abstract

In this experiment, embryos of Asian toad, Bufo gargarizans, were investigated to evaluate toxicity of chemicals along FETAX(Frog Embryo Teratogenesis Assay-Xenopus) protocol. Asian toad, Bufo gargarizans, embryos incubated and investigation of Zn and Benomyl effect by probit analysis. As a result, depends on the concentrations of Zn and Benomyl, mortality and malformation rates were increases and larval body length were decreased. The teratogenic concentration($EC_{50}$) of Zn and Benomyl were 2.3, $1.0mg/{\ell}$, respectively and the embryo lethal concentration($LC_{50}$) Zn and Benomyl were 10.3, 6.9, respectively. The teratogenic index(TI) were 4.4 in Zn and 6.7 in Benomyl, thus showed teratogenicity in embryonic development of B. gargarizans. These results reveal that Zn and Benomyl in this experiment suppressed the development of embryos at relatively low concentration. Much of B. gargarizans embryos can be secured, and easy to incubate. In addition, mortality, malformation ratios, malformation patterns and growth rates are similar to the results from the other assay systems. Therefore, the B. gargarizans embryo teratogenesis assay system could be a useful tool to evaluate toxicity of pollutants in environment.

국내에 서식하는 두꺼비의 배아를 이용하여 화학물질의 독성평가에 대한 가능성을 파악하기 위해 FETAX(Frog Embryo Teratogenesis Assay-Xenopus) 기법에 따라 두꺼비(Bufo gargarizans)의 배아를 배양하면서 Zn과 Benomyl의 효과를 probit 분석법으로 조사하였다. 그 결과, Zn과 Benomyl의 농도에 의존하여 유생의 체장 길이는 감소하고 치사율과 기형율은 증가하였으며 Zn과 Benomyl의 teratogenic concentration($EC_{50}$)은 각각 2.3, $1.0mg/{\ell}$을 나타내었고 embryo lethal concentrations($LC_{50}$)은 10.3, $6.9mg/{\ell}$을 나타내었다. Teratogenic index($TI=LC_{50}/EC_{50}$)는 Zn의 경우 4.4, Benomyl의 경우 6.7을 나타내어 Zn과 Benomyl은 두꺼비 배아 발달에 최기형성 물질로 작용함을 알 수 있었다. 이상의 결과들로 보아 Zn과 Benomyl 모두 낮은 농도에서 두꺼비 배아발달에 민감하게 반응하였다. 이는 다량의 배아 확보가 가능하며 배양이 용이하고 치사율, 기형율, 성장률, 기형양상 등을 기존의 연구들과 비교하였을 때 유사한 결과를 나타내어 두꺼비 배아를 활용한 시험기법은 화학물질 및 환경오염물질의 독성검정에 활용할 수 있을 것으로 판단된다.

Keywords

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