Mitochondrial dysfunction in insulin insensitivity: implication of mitochondrial role in type 2 diabetes
Chih-Hao Wang1, Ching-Chu Wang, Yau-Huei Wei
1Institute of Biochemistry and Molecular Biology, National Yang-Ming University, Taipei, Taiwan.
Annals of the New York Academy of Sciences
|July 24, 2010
Summary
Mitochondrial dysfunction contributes to type 2 diabetes by impairing insulin sensitivity and energy production. Activating mitochondrial biogenesis may offer a therapeutic strategy for insulin resistance.
Area of Science:
- Biochemistry
- Cell Biology
- Metabolic Diseases
Background:
- Mitochondrial dysfunction is increasingly linked to type 2 diabetes.
- Impaired mitochondrial function can cause insulin insensitivity in muscle and fat cells due to energy deficits or signaling pathway defects.
Purpose of the Study:
- To investigate the role of mitochondrial function in insulin sensitivity and type 2 diabetes pathogenesis.
- To explore the potential of mitochondrial biogenesis as a therapeutic target.
Main Methods:
- Inhibition of cellular respiration and oxidative phosphorylation using respiratory inhibitors.
- Knockdown of genes critical for mitochondrial biogenesis.
- Assessment of adipocyte differentiation and insulin response.
- Measurement of adiponectin secretion and glucose utilization.
Main Results:
- Inhibiting mitochondrial respiration or biogenesis impaired preadipocyte differentiation and adipocyte insulin response.
- Defective mitochondria led to reduced adiponectin secretion, decreasing glucose utilization in other tissues.
- Environmental factors and toxins implicated in type 2 diabetes pathogenesis can affect mitochondrial function.
Conclusions:
- Mitochondrial dysfunction is a significant factor in the pathophysiology of insulin insensitivity.
- Activating mitochondrial biogenesis presents a promising strategy for preventing or treating insulin resistance and type 2 diabetes.
Related Concept Videos
01:24Type II Diabetes II: Pathophysiology
PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.
01:26Type II Diabetes I: Introduction
Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder characterized by insulin resistance, in which target tissues such as the liver, muscle, and adipose tissue respond poorly to insulin. It is also associated with inadequate compensatory insulin secretion, where pancreatic β-cells fail to produce sufficient insulin. Together, these abnormalities lead to persistent hyperglycemia.EtiologyT2DM develops through a complex interaction of genetic predisposition and environmental or...
01:26Type I Diabetes II: Pathophysiology
Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular uptake of...
01:26Diabetes Mellitus: Introduction
Diabetes mellitus consists of chronic metabolic disorders characterized by persistent hyperglycemia. This elevated blood glucose results from defects in insulin secretion, impaired insulin action, or both. Insulin, produced by pancreatic β-cells, is essential for maintaining glucose homeostasis by facilitating cellular glucose uptake for energy or storage. Disruptions in insulin production or function lead to glucose accumulation in the bloodstream, causing the clinical features and long-term...
01:22Diabetes Mellitus: Overview and Type I Subtype
Diabetes mellitus is a chronic metabolic disorder characterized by high blood glucose levels due to inadequate insulin production, insulin resistance, or both. The condition affects millions worldwide and can significantly impact their health and quality of life.
Type 1 diabetes is an autoimmune disease in which the immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body is unable to produce sufficient insulin, and individuals with...
Type 1 diabetes is an autoimmune disease in which the immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body is unable to produce sufficient insulin, and individuals with...
01:20Pathophysiology of Diabetes
Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility, suggesting a...
Type 1 diabetes is characterized by autoimmune-mediated destruction of pancreatic β cells, with environmental factors potentially triggering this process in genetically susceptible individuals. Despite many not having a family history, certain genes increase susceptibility, suggesting a...