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http://dx.doi.org/10.5352/JLS.2010.20.3.416

Variation of Lactate Dehydrogenase Isozymes in Angelfish (Pterophyllum scalare) according to Acute Environmental Change  

An, Chang-Su (Department of Quality Assurance, SK Chemicals Life Science Biz.)
Cho, Sung-Kyu (Industrial Science Research Institute, Cheongju University)
Yum, Jung-Joo (Department of Life Science, Cheongju University)
Publication Information
Journal of Life Science / v.20, no.3, 2010 , pp. 416-423 More about this Journal
Abstract
In this study, the properties and gene expression of the lactate dehydrogenase (EC 1.1.1.27, LDH) isozyme were studied in angelfish (Pterophyllum scalare) - known for their adaptation to the low oxygen environment of the tropics - which were acclimated to acute temperature change ($27{\pm}0.5{\rightarrow}18{\pm}0.5^{\circ}C$) and dissolved oxygen (DO) change ($6{\pm}1{\rightarrow}18\;ppm$) for 2 hours. The properties of the LDH isozymes were confirmed in the native-polyacrylamide gel electrophoresis, Western blot analysis and enzyme activity measurement. Liver- and eye-specific Ldh-C gene were expressed in liver, eye and brain tissues. Through Western blot analysis, the LDH $A_4$ isozyme was shown to have a more cathodal mobility relative to the $B_4$ isozyme. In the liver tissue, the LDH $A_4$ isozyme increased with temperature drop while the $B_4$ isozyme decreased. The LDH $A_4$ and $C_4$ isozymes increased with DO increment, while the $B_4$ isozyme decreased. In the eye tissue, the LDH $A_4$ and B4 isozymse increased with temperature drop while the $B_4$ isozyme decreased. The LDH $A_4$ and $B_4$ isozymes increased with DO increment, but the $C_4$ isozyme and isozymes including the subunit C decreased. In the heart tissue, LDH activity increased with DO increment, as well as the LDH $B_4$ isozyme. In the brain tissue, the LDH $A_4$ and $B_4$ isozymes increased with temperature drop. The LDH $B_4$ isozyme increased with DO increment. Accordingly, since the liver- and eye-specific Ldh-C are influenced by changes in DO and the LDH $B_4$ and $C_4$ isozymes are relatively controlled in the liver and eye tissues, the $C_4$ isozyme can be considered to have a lactate oxidase function.
Keywords
Angelfish (Pterophyllum scalare); lactate dehydrogenase; isozyme; temperature; DO;
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