한국어류학회지 (Korean Journal of Ichthyology)

  • 제22권1호
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  • Pages.1-8
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  • 2010
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  • 1225-8598(pISSN)
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  • 2288-3371(eISSN)
한국어류학회 (The Ichthyological Society of Korea)
권호 표지

고수온 환경에 의해 유도된 산화 스트레스에 대한 넙치의 항산화 작용과 생리적 변화

Antioxidant Defenses and Physiological Changes in Olive Flounder (Paralichthys olivaceus) in Response to Oxidative Stress Induced by Elevated Water Temperature

  • 신현숙 (한국해양대학교 해양환경.생명과학부) ;
  • 안광욱 (한국해양대학교 해양환경.생명과학부) ;
  • 김나나 (한국해양대학교 해양환경.생명과학부) ;
  • 최철영 (한국해양대학교 해양환경.생명과학부)
  • Shin, Hyun-Suk (Division of Marine Environment & Bioscience, Korea Maritime University) ;
  • An, Kwang-Wook (Division of Marine Environment & Bioscience, Korea Maritime University) ;
  • Kim, Na-Na (Division of Marine Environment & Bioscience, Korea Maritime University) ;
  • Choi, Cheol-Young (Division of Marine Environment & Bioscience, Korea Maritime University)
  • 투고 : 2010.01.21
  • 심사 : 2010.03.04
  • 발행 : 2010.03.31
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초록

고수온 환경 ($25^{\circ}C$와 $30^{\circ}C$)에 노출시킨 넙치의 산화 스트레스 정도를 알아보기 위하여 넙치의 간 조직에서 항산화 효소 [superoxide dismutase (SOD)와 catalase(CAT)] mRNA의 발현량 및 그 활성을 측정한 결과, $20^{\circ}C$ 대조구보다 $25^{\circ}C$와 $30^{\circ}C$ 실험구에서 증가하는 경향을 보였다. 또한 지질 과산화 지표로 사용되는 lipid peroxidation(LPO)을 측정한 결과, $25^{\circ}C$와 $30^{\circ}C$ 실험구에서 증가하는 경향을 나타내었다. LPO의 증가는 SOD 및 CAT의 증가와 밀접한 관련이 있으며, 체내의 $H_O_2$ 농도 또한 $25^{\circ}C$와 $30^{\circ}C$ 실험구에서 증가하는 것으로 보아 고수온 환경이 넙치의 산화 스트레스를 유발하고 있는 것으로 사료된다. 고수온 환경에 노출시킨 넙치의 혈중 alanine aminotransferase (AlaAT)와 aspartate aminotransferase (AspAT) 값을 측정 한 결과, AlaAT와 AspAT 모두 유의적으로 증가하는 경향을 보였다. 또한 면역 지표로 사용되는 lysozyme 활성도가 $20^{\circ}C$ 대조구보다 $30^{\circ}C$ 실험구에서 유의적으로 낮은 값을 나타낸 점으로 보아, 고수온 환경에 노출된 넙치에서는 간 세포의 손상뿐만 아니라 면역력 또한 저해되고 있는 것으로 사료된다. 고수온 환경에 노출시킨 넙치에서 항산화 효소인 SOD와 CAT mRNA 발현량 및 활성이 증가하였을 뿐만 아니라 활성산소와 LPO 값 또한 증가된 점으로 보아, 고수온 환경은 넙치의 체내에서 산화 스트레스를 유발시키는 동시에 면역 기능을 저해시키고 있는 것으로 사료된다.

We determined oxidative stress caused by thermal stress in olive flounder Paralichthys olivaceus based on the altered-mRNA expression and enzymatic activity of two key antioxidant enzymes, superoxide dismutase (SOD) and catalase (CAT), along with monitoring of several other biomarkers. When the fish were exposed to acute thermal change (from $20^{\circ}C$ to $25^{\circ}C$ and $30^{\circ}C$), the expression and activity of both enzymes were significantly higher at elevated temperatures ($25^{\circ}C$ and $30^{\circ}C$) than at $20^{\circ}C$. Lipid peroxidation (LPO) was also higher at $25^{\circ}C$ and $30^{\circ}C$ than at $20^{\circ}C$. In addition, the plasma $H_2O_2$ concentration was significantly increased by thermal stress. Furthermore, we investigated changes due to thermal stress by measuring levels of plasma alanine aminotransferase (AlaAT) and aspartate aminotrasferase (AspAT). Both were significantly increased by thermal stress. As an immune indicator, the lysozyme concentration was lower at $30^{\circ}C$ than at $20^{\circ}C$, indicating that thermal stress decreases immune function. Therefore, thermal stress could induce oxidative stress and suppress immune function and can cause physiological stress.

키워드

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