Influence of melatonin on glutathione system in rats skeletal muscle under alloxan induced diabetes
O.Yu. Kushnir, I.M. Yaremii, V.I. Shvets, N.V. Shvets
Higher education institution in Ukraine «Bukovinian State Medical University», Chernivtsi, Ukraine
DOI: https://doi.org/10.15407/fz64.05.054

Abstract
The aim was to determine the influence of melatonin on basal levels of glucose (BG), the levels of protein
carbonyl content, HbA1c and thiobarbituric acid reactive compounds (TBCRC), reduced glutathione (GSH),
activities of glutathione reductase [EC 1.6.4.2] (GR), glutathione peroxidase [EC 1.11.1.9] (GPx), glucose-
6-phosphate dehydrogenase [EC 1.1.1.49] (G-6-PhD) in the muscles of alloxan diabetic rats (DM1T).
BG levels in blood of rats with DM1T increased on 139%, while in group of alloxan diabetic rats with
impaired glucose tolerance (IGT) – were not differ from control. HbA1c levels in the blood of animals with
DM1T and IGT exceeded control by 219% and 123%, the level of protein carbonyl groups – by 76% and
36%, the level of TBCRC – by 58% and 36% respectively. Activities of GR, GPx, G-6-PhD and the level of
GSH were decreased on 25%, 18%, 50% and 42% in rats with DM1T while in rats with IGT these indexes
(besides GSH) were increased on 37%, 22%, 35% respectively than control. Melatonin lowered the BG
level on 56% in DM1T rats in comparison to initial levels. It normalized activities of GR, GPx, G-6-PhD
and lipid peroxidation, and protein carbonylation as well as hemoglobin glycosylation, so these indexes
did not differ from control. Thus, melatonin has strong potential to regulate glucose homeostasis through
enhanced glucose consumption, decreased oxidative stress by activation of the glutathione protection system.
Keywords:
melatonin; alloxan diabetes; glutathione system; skeletal muscle; rats
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