The Korean Journal of Pesticide Science (농약과학회지)

The Korean Society of Pesticide Science (한국농약과학회)
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Changes in Esterase Isozyme Activity after Selective Diets and Insecticides in Monochamus saltuarius (Gebler) Larva

북방수염하늘소(Monochamus saltuarius) 유충의 먹이와 살충제 처리에 따른 소화 효소의 활성 변화

  • Cho, Sae-Youll (Division of Metabolism, Endocrinology, and Diabetes, University of Michigan) ;
  • Kim, Ju-Hyun (Department of Plant Biotechnology Program, Division of Biotechnology, School of Biotechnology, Kangwon National University) ;
  • Park, Yong-Chul (Department of Plant Biotechnology Program, Division of Biotechnology, School of Biotechnology, Kangwon National University)
  • 조세열 ;
  • 김주현 (강원대학교 BT 특성화 학부 식물생명공학) ;
  • 박용철 (강원대학교 BT 특성화 학부 식물생명공학)
  • Published : 2007.09.30
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Abstract

Esterase isozymes were extracted from final instar larvae of M. saltuarius treated with selective diets and inhibitors. Twenty esterase isozymes were separated on 12% native-PAGE gel and stained with three different substrates(${\alpha}$-naphthyl acetate, ${\beta}$-naphthyl acetate, or ${\alpha}$-naphthyl butyrate). Interestingly, the isozymes of Est7(${\alpha}$-naphthyl acetate and ${\alpha}$-naphthyl butyrate) and Est6(${\beta}$-naphthyl acetate) were specifically activated in final instar larvae fed with the bark of Pinus koraiensis. However, we could not find any band from substrate ${\beta}$-naphthyl stearate. The esterase activities of Est3, Est6, and Est7 were inhibited by organophosphate and carbamate insecticides. In addition, The esterase activities of Est4, Est6, and Est7 were also inhibited by eserine. However, inhibition of esterase activities in methoprene, bornyl acetate, linal, cineol, and citral was not observed. However, It is necessary to reconfirm these results in vivo.

소나무 수피와 잣나무 수피를 먹이로 사육한 북방수염하늘소(M. saltuarius)의 종령유충의 소화액을 추출하여 4가지 기질(${\alpha}$-naphthyl acetate, ${\beta}$-naphthyl acetate, ${\alpha}$-naphthyl butyrate, ${\beta}$-naphthyl stearate)에 대한 에스테라제(esterase) 활성도 변화를 조사하였다. ${\alpha}$-naphthyl acetate를 기질로 하여 조사한 결과 Est7이 잣나무수피를 먹인 유충에서 강하게 활성화되었다. 또한, ${\beta}$-naphthyl acetate와 ${\alpha}$-naphthyl butyrate 기질을 사용한 경우에도 Est6과 Est7이 잣나무수피를 먹인 유충에서 강한 활성이 관찰 되었다. 그러나 ${\beta}$-naphthyl stearate에서 활성화 되는 에스테라제는 관찰할 수 없었다. 추출한 소화액에 카바메이트계와 유기인계 약제를 처리한 경우 Est7을 포함하여 Est3과 Est6이 강하게 저해되는 것으로 나타났다. 또한, eserine을 처리한 경우 Est4, Est6, Est7에서 강한 활성저해가 관찰되었다. Methoprene, bornyl acetate, linal, cineol, citral을 소화액에 첨가한 경우 에스테라제의 활성저해는 관찰되지 않았으나 이상의 결과는 in vitro에서 실시된 실험으로 추후 in vivo에서 재검증이 필요 할 것이다.

Keywords

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