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Melatonin and succinate reduce rat liver mitochondrial dysfunction in diabetes
I B Zavodnik1, E A Lapshina, V T Cheshchevik
1Institute for Pharmacology and Biochemistry, National Academy of Sciences of Belarus, Grodno, Belarus. zavodnik_il@mail.ru
Summary
Diabetes causes mitochondrial dysfunction, increasing reactive oxygen species. Succinate and melatonin partially corrected these mitochondrial disorders in diabetic rats, suggesting potential therapeutic benefits.
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Diabetes mellitus is characterized by hyperglycemia, leading to mitochondrial dysfunction and increased reactive oxygen species (ROS).
- This mitochondrial damage contributes to the pathological consequences of diabetes.
- Understanding specific functional damage in liver mitochondria during diabetes is crucial for developing effective treatments.
Purpose of the Study:
- To investigate specific functional damage in rat liver mitochondria during diabetes.
- To evaluate the potential of succinate and melatonin in correcting mitochondrial disorders metabolically and antioxidatively.
Main Methods:
- Streptozotocin-induced diabetes model in rats.
- Assessment of liver mitochondrial metabolism, including enzyme activity (α-ketoglutarate dehydrogenase) and respiratory function.
- Administration of pharmacological doses of melatonin or succinate for 30 days.
- Evaluation of antioxidative status markers like catalase and glutathione-S-transferase.
Main Results:
- Streptozotocin-induced diabetes caused significant activation of α-ketoglutarate dehydrogenase and impaired mitochondrial respiratory function.
- Both melatonin and succinate treatments reversed oxygen consumption rates and acceptor control ratios to non-diabetic levels.
- Melatonin enhanced catalase activity and prevented mitochondrial glutathione-S-transferase inhibition.
- Succinate prevented the activation of α-ketoglutarate dehydrogenase.
Conclusions:
- Mitochondrial dysfunction in diabetes is partially remedied by succinate or melatonin administration.
- These compounds may offer benefits for diabetes treatment by improving mitochondrial physiology and cellular antioxidative status.
