생명과학회지 (Journal of Life Science)

  • 제15권1호
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  • Pages.71-79
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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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급격한 용존산소량 증가에 순응한 꺽지(Coreoperca herzi)와 모래무지(Pseudogobioesocinus) 젖산탈수소효소 활성과 동위효소의 변화

Changes of Activities and Isozymes of Lactate Dehydrogenase in Coreoperca herzi and Pseudogobio esocinus Acclimated to Rapid Increase of Dissolved Oxygen

  • 조성규 (청주대학교 생명유전통계학부 생명과학전공) ;
  • 염정주 (청주대학교 생명유전통계학부 생명과학전공)
  • Cho Sung Kyu (Department of Life Science, Cheongju University) ;
  • Yum Jung Joo (Department of Life Science, Cheongju University)
  • 발행 : 2005.02.01
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초록

용존산소(DO)의 급격한 증가에 순응된 꺽지(Coreoperca herzi)와 모래무지(Pseudogobio esocinus) 조직내 젖산탈수소효소(EC 1.1.1.27, lactate dehydrogenase, LDH)의 대사와 $C_4$ 동위효소를 확인하였다. DO 18 ppm에 갑작스럽게 순응시 꺽지 LDH활성은 뇌와 간조직에서 각각 $35-39\%$ 변화되었고, 다른 조직에서는 $20\%$이내로 변화가 적었다. 골격근조직은 LDH $A_4$ 동위효소가 증가되고 하부단위체 C를 포함하는 동위효소는 감소되었다. 심장조직은 $B_4$ 동위효소가 조금 증가되었다. 신장조직도 $B_4$가 증가하고 눈 조직은 eye-specific $C_4$와 C hybrid가 감소되어 조절되었다. DO 증가에 갑작스럽게 순응한 모래무지 간조직에서 LDH 활성은 30분에서 급격하게 $150\%$이상 크게 증가되었고, 다른 조직에서는 $70\%$ 이상 변화되었다. 그리고 골격근조직은 $A_4$ 동위효소가 증가하고 다른 조직들에서는 $B_4$가 증가되었으며 특히 간 조직의 대사는 liver-specific $C_4$가 증가하고 $A_4$ 는 감소되어 조절되었다. 그러나 꺽지 눈 조직의 대사는 LDH 활성이 감소하고 eye-specific $C_4$ 동위효소가 감소되어 조절되었다. 따라서 DO증가에 순응시 모래무지는 꺽지에 비해 LDH 활성이 크게 증가되었고 동위효소의 변화정도도 크게 나타났으며, eye-spe-cific $C_4$와 liver-specific $C_4$ 동위효소는 lactate oxidase로서 대사를 조절하였다. 그러므로 환경변화에 순응하여 나타나는 대사는 종이 이전에 어떤 서식조건에 적응되었는가에 따라 다른 것으로 사료된다.

The metabolism of lactate dehydrogenase (EC 1.1.1.27, LDH) and $C_4$ isozyme were studied in tissues of Coreoperca herzi and Pseudogobio esocinus acclimated to rapid increase of dissolved oxygen (DO). In C. herzi the LDH activity was changed $35-39\%$ in brain and liver tissues, and within $20\%$ in other tissues. The $B_4$ isozyme was increased and isozyme containing subunit C was decreased in muscle tissue. The $B_4$ isozyme was increased in heart and kidney. In P. esocinus, the LDH activity in liver tissues was largely increased to $150\%$ for 30 minute and $70\%$ in other tissues. The $A_4$ isozyme was increased in muscle and $B_4$ isozyme was increased in other tissues. Especially, the metabolism of liver tissue in P. esocinus was regulated by increasing liver-specific $C_4$ and decreasing $A_4$ isozyme. But the metabolism of eye tissue in C. herzi was regulated by decreasing LDH activity and eye-specific $C_4$ isozyme. The LDH activity and LDH isozyme in P. esocinus were largely increased than C. herzi acclimated to rapid increase of DO. And eye-specific $C_4$ and liver-specific $C_4$ isozymes played role as lactate oxidase. Therefore, the response of species acclimated to rapid increase of DO seems to be variable, perhaps due to prior exposure to environmental conditions.

키워드

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