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Related Concept Videos

Pathophysiology of Diabetes01:20

Pathophysiology 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 I Diabetes II: Pathophysiology01:26

Type 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...
Type II Diabetes II: Pathophysiology01:24

Type 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.
Mitochondria01:37

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
Diabetes Mellitus: Introduction01:26

Diabetes 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...

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Phosphorus-31 Magnetic Resonance Spectroscopy: A Tool for Measuring In Vivo Mitochondrial Oxidative Phosphorylation Capacity in Human Skeletal Muscle
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Mitochondrial function in diabetes: novel methodology and new insight.

Liping Yu1, Brian D Fink, Judith A Herlein

  • 1NMR Core Facility and Department of Biochemistry, University of Iowa, Iowa City, Iowa, USA.

Diabetes
|January 19, 2013
PubMed
Summary

Mitochondria in diabetic muscle produce less ATP and more reactive oxygen species (ROS). This study reveals new insights into mitochondrial dysfunction in insulin-deficient diabetes.

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Area of Science:

  • Mitochondrial physiology
  • Metabolic disease research
  • Biochemistry

Background:

  • Interpreting mitochondrial function is complex due to interdependent parameters.
  • Insulin-deficient diabetes significantly impacts cellular energy metabolism.
  • Understanding mitochondrial dysfunction is crucial for metabolic disease research.

Purpose of the Study:

  • To investigate muscle mitochondrial function in insulin-deficient diabetes.
  • To develop and apply a novel method for simultaneous ATP and ROS quantification.
  • To elucidate the mechanisms of ATP production and ROS generation dysregulation.

Main Methods:

  • Utilized a 2-deoxyglucose (2DOG) energy clamp to fix inner mitochondrial membrane potential (ΔΨ).
  • Quantified ATP production via 2DOG conversion using advanced NMR spectroscopy ((1)H and (1)H/(13)C HSQC).
  • Measured reactive oxygen species (ROS) simultaneously with ATP production.

Main Results:

  • Diabetic muscle mitochondria exhibited lower ATP production across respiration states.
  • Increased ROS generation per unit of ATP was observed in diabetic mitochondria.
  • Diabetic mitochondria showed increased ROS at lower ΔΨ thresholds and limited capacity to use ΔΨ for ATP synthesis.

Conclusions:

  • Novel methodology enables sensitive, high-throughput measurement of mitochondrial ATP production and ROS.
  • Insulin-deficient diabetes dysregulates mitochondrial ATP synthesis and exacerbates ROS production.
  • Mitochondrial ATP production impairment in diabetes involves both respiration and ΔΨ utilization limitations.