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Carbohydrate metabolism is a fundamental biochemical process that ensures a constant supply of energy to living cells. The most important carbohydrate is glucose, which can be broken down via glycolysis to enter into the Krebs cycle and eventually lead to the production of ATP through oxidative phosphorylation.
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Lactosylceramide contributes to mitochondrial dysfunction in diabetes.

Sergei A Novgorodov1, Christopher L Riley2, Jin Yu3

  • 1Departments of Neuroscience Medical University of South Carolina, Charleston, SC 29425 novgoros@musc.edu.

Journal of Lipid Research
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Summary

Diabetic cardiomyopathy involves mitochondrial dysfunction. In type 1 diabetes, elevated lactosylceramide impairs heart mitochondria, suggesting the glycosphingolipid pathway as a therapeutic target.

Keywords:
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Area of Science:

  • Cardiovascular Biology
  • Metabolic Disorders
  • Mitochondrial Medicine

Background:

  • Sphingolipids are crucial in cellular stress responses and mitochondrial function.
  • Mitochondrial dysfunction contributes significantly to diabetic cardiomyopathy.
  • Understanding cardiac sphingolipid metabolism in diabetes is vital.

Purpose of the Study:

  • To investigate alterations in cardiac sphingolipid metabolism in a mouse model of type 1 diabetes.
  • To identify specific sphingolipids contributing to mitochondrial dysfunction in diabetic hearts.
  • To explore potential therapeutic targets within sphingolipid metabolic pathways.

Main Methods:

  • Utilized a mouse model of streptozotocin-induced type 1 diabetes.
  • Examined expression of key enzymes in ceramide biosynthesis (e.g., desaturase 1, CerS2, SPT1).
  • Assessed mitochondrial respiration and calcium retention capacity (CRC).
  • Investigated the role of lactosylceramide and neutral ceramidase (NCDase).

Main Results:

  • Diabetes activated ceramide biosynthesis but not mitochondrial ceramide levels.
  • Elevated lactosylceramide correlated with decreased mitochondrial respiration and CRC.
  • Lactosylceramide was identified as a key sphingolipid impairing mitochondrial function.
  • NCDase knockdown increased lactosylceramide, indicating pathway crosstalk.

Conclusions:

  • The glycosphingolipid pathway, particularly lactosylceramide accumulation, is implicated in mitochondrial defects in type 1 diabetes.
  • Targeting the glycosphingolipid pathway may offer a strategy to ameliorate mitochondrial abnormalities in diabetic hearts.