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Related Concept Videos

Overview of Lipid Metabolism01:24

Overview of Lipid Metabolism

Lipid metabolism is a crucial process in the human body that involves the synthesis and degradation of lipids. This process is essential for energy production, cell membrane formation, and hormone production, among other functions.
Lipolysis: The Breakdown of Lipids:
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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,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Translocation of Proteins into the Mitochondria01:19

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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 dysfunction and lipotoxicity.

Patrick Schrauwen1, Vera Schrauwen-Hinderling, Joris Hoeks

  • 1Maastricht University Medical Centre (MUMC), Nutrition and Toxicology Research Institute Maastricht (NUTRIM), Department of Human Biology, P.O. Box 616, 6200 MD Maastricht, The Netherlands. p.schrauwen@hb.unimaas.nl

Biochimica Et Biophysica Acta
|September 29, 2009
PubMed
Summary

Fat accumulation in skeletal muscle may cause mitochondrial dysfunction, leading to insulin resistance and type 2 diabetes. This lipotoxicity precedes the observed mitochondrial decline in diabetes.

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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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Area of Science:

  • Metabolic disorders
  • Mitochondrial biology
  • Skeletal muscle physiology

Background:

  • Mitochondrial dysfunction in skeletal muscle is linked to insulin resistance and type 2 diabetes.
  • Reduced mitochondrial capacity can lead to lipid accumulation, impairing insulin signaling.
  • The cause of mitochondrial dysfunction in pre-diabetic states remains unclear.

Purpose of the Study:

  • To investigate the role of lipotoxicity in mitochondrial dysfunction in skeletal muscle.
  • To explore whether fat accumulation precedes mitochondrial dysfunction in insulin resistance.

Main Methods:

  • Review of existing literature on mitochondrial function, insulin resistance, and type 2 diabetes.
  • Analysis of studies reporting lipid peroxidation and mitochondrial uncoupling protein-3 levels in relevant patient groups.

Main Results:

  • Lipotoxicity, driven by accumulating fatty acids, may cause mitochondrial dysfunction.
  • Fatty acids near mitochondria are susceptible to reactive oxygen species (ROS)-induced lipid peroxidation.
  • Increased lipid peroxidation and reduced mitochondrial uncoupling protein-3 are observed in insulin-resistant skeletal muscle.

Conclusions:

  • Skeletal muscle fat accumulation may precede mitochondrial dysfunction in type 2 diabetes.
  • Lipotoxicity-induced damage to mitochondrial components could underlie mitochondrial dysfunction.
  • This supports the hypothesis that fat accumulation is an early event in the development of type 2 diabetes.