Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Lactate Dehydrogenase Isozyme of Hypoxia Tropical Catfish(Pangasius Polyuranodon, Hypostomus Plecostomus)

저산소 환경에 서식하는 열대성 catfish (Pangasius Polyuranodon, Hypostomus Ple-Costomus)의 젖산탈수소효소 동위효소

  • 조성규 (청주대학교 생명유전통계학부 생명과학전공) ;
  • 염정주 (청주대학교 생명유전통계학부 생명과학전공)
  • Published : 2004.08.01
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Abstract

In native-polyacrylamide gel electrophoresis of Pangasius polyuranodon, the lactate dehydrogenase (EC 1.1.1.27, LDH) $A_4$, $A_3$B, $A_2$$B_2$,$AB_3$ and $B_4$ isozymes were expressed in various tissues. The LDH $A_4$ and liver-specific $C_4$ isozymes were expressed in the tissues of Hypostomus Plecostomus. The bands of LDH in skeletal muscle, heart and eye tissues were not detected while one band was detected in kidney and liver, and four bands were detected in brain. The detected one band in liver was identified as alcohol dehydrogenase and an anodal band of skeletal muscle was identified as nothing dehydrogenase. The LDH in skeletal muscle, heart and eye might function as pyruvate reductase. The degree of inhibitions of LDH in skeletal muscle and heart of P. polyuranodon by 10 mM pyruvate were measured 57.6% and 73.8%, respectively. However, those of LDH in tissues of H. plecostomus were measured 52.7-61.8% so tissue specificity did not appear. Therefore, H. ple-costomus might be more acclimated to hypoxic environment by anaerobic metabolism of LDH iso-zymes than P. polyuranodon.

Pangasius polyuranodon 조직의 젖산탈수소효소(EC 1.1.1.27, lactate dehydrogenase, LDH)는$A_4$, $A_3$B, $A_2$$B_2$, $AB_3$ 및 $B_4$동위효소들이 모두 발현되었다. Hypostomus Plecostomus LDH의 경우 $A_4$와 liver-specific $C_4$동위효소가 발현되었다. 골격 근, 심장 및 눈조직에서는 동위효소의 band가 나타나지 않았고, 신장 및 간조직에서 각각 하나의 band가 나타났으며, 뇌조직에서는 4개의 동위효소 band들이 나타났다. 간조직의 band는 alcohol dehydrogenase로 확인되었고, 골격근에서 양극쪽 band는 nothing dehydrogenase로 확인되었다. 따라서 골격근, 심장 및 눈조직에서 LDH는 pyruvate reductase 로서 기능을 하는 것으로 생각된다. P. polyuranodon 조직별 피루브산에 의한 저해정도는 10 mM 피루브산에서 골격근은 57.6%, 심장은 73.8%로 측정되었으나 H. plecostomus의 조직들은 52.7-61.8%로 측정되어 조직특이성이 나타나지 않았다. 따라서 H. plecostomus가 P. polyuranodon 보다 더욱 저산소 환경에서 혐기적 대사에 의해 순응되어졌다고 사료된다.

Keywords

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