Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Metabolism of Lactate Dehydrogenase in Tissues from Ldh-C Expressed Mice (Mus musculus) in a Starvation State

기아상태에서 Ldh-C가 발현된 생쥐(Mus musculus) 조직의 젖산탈수소효소의 대사

  • Yum, Jung Joo (Department of Life Science, Cheongju University) ;
  • Kim, Gyu Dong (Department of Life Science, Cheongju University)
  • 염정주 (청주대학교 생명과학과) ;
  • 김규동 (청주대학교 생명과학과)
  • Received : 2017.08.31
  • Accepted : 2018.01.16
  • Published : 2018.01.30
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Abstract

To confirm the function of lactate dehydrogenase (LDH) (EC 1.1.1.27, LDH), its metabolism was studied by activity, kinetics, and isozyme analysis in tissues of Ldh testis-specific C expressing mice (Mus musculus) maintained in a state of starvation for 48 hr and 96 hr. In skeletal muscle, liver, and eye tissues, LDH and LDH $A_4$ activity increased and anaerobic metabolism predominated. While LDH activity in the heart and kidney tissues decreased, LDH $B_4$ activity increased and aerobic metabolism predominated, producing pyruvic acid. In the testis tissue, LDH $C_4$ activity decreased. In the brain tissue, LDH activity increased, but the isozyme change was small and the amount of pyruvic acid decreased. $K{_m}^{PYR}$ increased in tissues other than kidney tissue, and the affinity for pyruvic acid decreased. Consequently, in Ldh-A and B-expressing tissues, the activities of isozymes with higher concentrations increased. However, in Ldh-A, B, and C-expressing tissue, $C_4$ decreased and the function of the tissue also decreased. In particular, LDH in brain tissue played a role as a pyruvate reductase. Therefore, this process might be the mechanism for producing energy in the state of starvation.

젖산탈수소효소(Lactate dehydrogenase, EC 1.1.1.27, LDH)의 기능을 확인하기 위해서 Ldh testis-specific C가 발현된 생쥐(Mus musculus)를 48 hr과 96 hr 기아상태로 유지시킨 후 조직들의 LDH 대사를 LDH 활성, 역학 및 동위효소를 분석하여 연구하였다. 골격근, 간 및 눈조직에서 LDH와 LDH $A_4$활성이 증가되어 혐기적 대사가 우세하였고, 심장과 신장조직의 LDH 활성은 감소되지만 LDH $B_4$ 활성이 증가되어 피루브산을 생성하는 호기적 대사가 우세하였다. 하지만 정소조직에서는 LDH $C_4$가 감소되었고, 뇌조직의 LDH 활성은 조직 중에서 가장 많이 증가되었지만 동위효소의 변화가 작고 피루브산의 양이 감소되었다. 신장조직을 제외한 조직들에서 $K{_m}^{PYR}$이 증가되어 피루브산에 대한 친화력이 감소된 것으로 확인되었다. 실험결과 Ldh-A, B가 발현된 조직에서는 상대 농도가 큰 동위효소의 활성이 증가되었으나 Ldh-A, B, C가 발현된 정소조직은 LDH $C_4$가 감소되어 기능이 저하되었으며 특히 뇌조직에서 LDH는 피루브산 환원효소로서 역할을 하는 것으로 확인되었다. 따라서 이 과정은 기아상태에서 에너지를 생성하는 기작이 될 수 있는 것으로 사료된다.

Keywords

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