Abstract
When hyperthyroidism develops, there are increases in the level of reduced glutathione and in the activities of glutathione peroxidase (GP) and glutathione reductase (GR) in the rat liver, heart, and serum. The activity of glucose-6-phosphate dehydrogenase (G-6-PDH) also increases, which is likely to be associated with the necessity of delivering of NADPH for the GP/GR system. The activity of NADP isocitrate dehydrogenase (IDН) changes slightly. With administration of melatonin for thyrotoxicosis, the content of reduced glutathione Increases in the examined tissues to a greater extent, the activities of GP and GR become normal. With melatonin being administered in hyperthyroidism, the changes in G-6-PDH and IDH activities are tissue-specific and more pronounced for G-6-PDH. Melatonin appears to act as an adaptogen that regulates the activity of the glutathione system and NADPH-generating enzymes in accordance with the influence of pathogenic factors on the body.
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