Molecular and cellular biochemistry
-
Mol. Cell. Biochem. · Nov 2011
Stress-induced alternations in CuZnSOD and MnSOD activity in cellular compartments of rat liver.
Exposure to different stressors initiates generation of reactive oxygen species (ROS), which create harmful environment for cellular macromolecules. Superoxide dismutases (SODs) represent the first line of antioxidant defense. Hence, any alternation in their function might be potentially damaging. ⋯ Data have shown that different stressors have diverse effect on hepatic CuZnSOD and MnSOD activity as well as on serum CORT level. Increased nuclear CuZnSOD activity after acute stress represents physiological response since the named activity protects cells against oxidative stress, while chronic IS stress compromises CuZnSOD function, suggesting an inefficient defense against ROS. Observed decrease of MnSOD activities indicate inadequate elimination of ROS after acute or chronic stress, which is characteristic of the oxidative stress.