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KMID : 0613820050150010071
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Journal of Life Science
2005 Volume.15 No. 1 p.71 ~ p.79
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Changes of Activities and Isozymes of Lactate Dehydrogenase in Coreoperca herzi and Pseudogobio esocinus Acclimated to Rapid Increase of Dissolved Oxygen
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Cho Sung-Kyu
Yum Jung-Joo
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Abstract
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The metabolism of lactate dehydrogenase (EC 1.1.1.27, LDH) and C₄isozyme 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 A₄isozyme was increased and isozyme containing subunit C was decreased in muscle tissue. The B₄isozyme 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 A₄isozyme was increased in muscle and B₄isozyme was increased in other tissues. Especially, the metabolism of liver tissue in P. esocinus was regulated by increasing liver-specific C₄and decreasing A₄isozyme. But the metabolism of eye tissue in C. herzi was regulated by decreasing LDH activity and eye-specific C₄isozyme. The LDH activity and LDH isozyme in P. esocinus were largely increased than C. herzi acclimated to rapid increase of DO. And eye-specific C₄and liver-specific C₄isozymes 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.
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