생명과학회지 (Journal of Life Science)

  • 제15권2호
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  • Pages.304-310
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  • 2005
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  • 1225-9918(pISSN)
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  • 2287-3406(eISSN)
한국생명과학회 (Korean Society of Life Science)
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제초제 Paraquat의 NAD(H) 산화환원에 대한 영향

Effect of Herbicide Paraquat on NAD(H)-Redox-cycle

  • 김미림 (대구한의대학교 식품조리영양학부) ;
  • 최경호 (대구가톨릭대학교 식품영양학과)
  • Kim Mi-Lim (Faculty of Cuisine & Nutrition, Daegu Haany University) ;
  • Choi Kyung-Ho (Department of Food Science and Nutrition, Daegu Catholic University)
  • 발행 : 2005.04.01
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⟨ 이전 논문 다음 논문 ⟩

초록

생체세포에 대한 paraquat의 독작용은 superoxide dismutase 활성저해에 기인하는 것으로 알려져 있다. 그러나 세균이 paraquat에 매우 짧은 시간동안의 노출에 의하여서도 독작용을 받을 수 있는 것으로 검토됨에 따라 paraquat의 독작용의 하나로서 전자전달에 미치는 영향 중 NAD(H)의 산화 및 환원반응에 미치는 영향을 검토한 결과는 다음과 같다. 공시균의 원형질막 획분, rat mitocondria분산액 및 NAD-dependent dehydrogenase에 의한 산화 및 환원시 paraquat 첨가구에서 반응 Graph의 경사도가 더 컸으며, 반응 개시점 및 종결점이 대조구에 비해 낮은 결과로 반응이 가속화되는 결과를 볼 수 있었다. 반응을 경시적으로 NAD(H)의 함량변화로 검토한 결과에서도 원형질 막 획분과 rat mitocondria 분산액을 이용한 경우에 10분간의 NADH산화량이 대조구는 각각 960 mM, 1,187 mM이었으나 Paraquat 처리구는 각각 1,200 mM, 1,434 mM로 Paraquat 처리구가 반응 가속화 경향을 보였다. NAD(H) dependent dehydrogenase에 의한 NAD(H)의 산화 및 환원 반응에서도 대조구에 비하여 Paraquat 처리구가 초기반응의 가속화 및 총산화량의 증가를 보였다.

This study was carried out to investigate the effect of herbicide paraquat (1,1-dimethyl-4,4-bipyridilium dichloride) on the electron transport system of the cell. When actively growing cells of bacteria were exposed to the 1.0 mM paraquat, more than $50\%$ of the cells were killed at 0 hour. But specific activities of superoxide dismutase (SOD) were not changed at 0 hour of paraquat treatment. Oxido-reductions of NAD (H) by the suspension of bacterial membtane, rat mithochondria and NAD-dependent dehydrogenase were accelerated by paraquat treatment.

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