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http://dx.doi.org/10.5352/JLS.2021.31.12.1066

Metabolic Adjustment of Lactate Dehydrogenase Isozymes to a Change in Dissolved Oxygen in Bluegill (Lepomis macrochirus)  

Ku, Bora (Division of Vectors & Parasitic Diseases, Korea Disease Control and Prevention Agency)
Cho, Sung Kyu (Department of Premedicine, Eulji University)
Yum, Jung Joo (Department of Life Science, Cheongju University)
Publication Information
Journal of Life Science / v.31, no.12, 2021 , pp. 1066-1071 More about this Journal
Abstract
The aim of this study was to examine the metabolic adjustment of lactate dehydrogenase (EC 1.1.1.27, LDH) isozymes to a change in dissolved oxygen (DO) in bluegill (Lepomis macrochirus). After bluegills were adapted to a constant environment in an aquarium, the DO was changed to investigate the activity of LDH isozyme and the relative ratio of subunits A, B, and C for each tissue. When the DO was decreased from 18 ppm to 6 ppm, LDH in skeletal muscle, heart, and brain tissues recovered to the level of control activity within 12, 12, and 6 hr, respectively. LDH activity changed in accordance with a change in DO. The compensation was performed rapidly and is thought to be an important function of LDH in enabling bluegills to adapt to their environment. In bluegill heart, eye, and brain tissues, the relative ratio of subunit A increased and showed a tendency to recover similarly to the subunit ratio of control groups up to 12 hr. It is thought that the anaerobic metabolism using subunit A was increased in the initial stage when DO was changed. In addition, the results revealed that subunit C was more similar to subunit A than subunit B. In bluegills, subunits A and C of LDH seem to be evolutionarily similar. LDH isozymes, mainly containing subunits A and C, are likely responsible for the function of pyruvate reductase, which plays a role in making the bluegill adapt to a hypoxic environment through anaerobic metabolism.
Keywords
Bluegill; DO; isozyme; lactate dehydrogenase; LDH subunit;
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