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Published on: January 23, 2018
Insulin attenuates diabetes-related mitochondrial alterations: a comparative study
P I Moreira1, A P Rolo, C Sena
1Center for Neuroscience and Cell Biology, University of Coimbra, Portugal.
Medicinal Chemistry (Shariqah (United Arab Emirates))
|September 5, 2006
Summary
Insulin treatment improves mitochondrial function in diabetic rats by reducing oxidative stress and enhancing energy production. This therapy protects against diabetes-related mitochondrial damage in the brain, heart, and kidneys.
Area of Science:
- Biochemistry
- Cell Biology
- Endocrinology
Background:
- Diabetes mellitus is associated with mitochondrial dysfunction, impacting cellular energy production and increasing oxidative stress.
- Streptozotocin (STZ)-induced diabetes in rats is a model used to study the metabolic and cellular consequences of hyperglycemia.
- Mitochondria are crucial for cellular respiration and ATP production; their dysfunction contributes to various pathologies.
Purpose of the Study:
- To investigate the effects of insulin treatment on mitochondrial function in brain, heart, and kidney tissues of STZ-induced diabetic rats.
- To compare mitochondrial parameters between diabetic rats, insulin-treated diabetic rats, and control rats.
- To assess the protective role of insulin against diabetes-induced mitochondrial damage and oxidative stress.
Main Methods:
- Isolation of mitochondria from brain, heart, and kidney tissues of control, STZ-diabetic, and insulin-treated STZ-diabetic rats.
- Evaluation of mitochondrial respiratory indexes, transmembrane potential, ATP content, coenzyme Q levels, and calcium accumulation.
- Measurement of oxidative stress markers, including hydrogen peroxide production and antioxidant enzyme activities (superoxide dismutase, glutathione peroxidase, glutathione reductase).
Main Results:
- Diabetes significantly altered coenzyme Q9 levels and increased hydrogen peroxide production in kidney mitochondria, alongside elevated antioxidant enzyme activity.
- Diabetic brain mitochondria showed reduced ATP content and calcium accumulation capacity, while heart and kidney mitochondria exhibited a slight increase in calcium accumulation.
- Insulin treatment normalized coenzyme Q9 levels, antioxidant enzyme activities, and improved ATP content and calcium accumulation in mitochondria from diabetic rats.
Conclusions:
- Insulin therapy effectively attenuates diabetes-induced mitochondrial dysfunction, including oxidative stress and impaired oxidative phosphorylation.
- Insulin treatment demonstrates a protective effect on mitochondria in the brain, heart, and kidneys of diabetic rats.
- Beyond glycemic control, insulin therapy may offer broader protection against age-related disorders linked to mitochondrial dysfunction, such as diabetes.
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