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High-glucose diets induce mitochondrial dysfunction in Caenorhabditis elegans.

Jonathan Alcántar-Fernández1,2, Angélica González-Maciel3, Rafael Reynoso-Robles3

  • 1Programa de Doctorado en Ciencias Biomédicas, Universidad Nacional Autónoma de México (UNAM), Ciudad de México, México.

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|December 18, 2019
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Summary

High-glucose diets cause mitochondrial swelling and alter metabolic gene expression in C. elegans. This suggests a cellular stress response, potentially involving mitophagy, to manage glucose toxicity and maintain organism health.

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Area of Science:

  • Cell Biology
  • Metabolism
  • Genetics

Background:

  • Glucose is vital for organismal development, fertility, and lifespan.
  • Impaired glucose homeostasis in humans is linked to obesity and type 2 diabetes.
  • Previous studies showed high-glucose diets (HGD) affect lipid metabolism and longevity in C. elegans.

Purpose of the Study:

  • To investigate the cellular and molecular effects of HGD on mitochondria and gene expression in C. elegans.
  • To understand the organism's response to glucose toxicity.

Main Methods:

  • Dietary manipulation with varying glucose concentrations in C. elegans.
  • Mitochondrial morphology assessment in germ and muscle cells.
  • Enzymatic activity assays for mitochondrial respiratory complexes.
  • Quantitative gene expression analysis of metabolic, antioxidant, and mitophagy genes.

Main Results:

  • Increasing dietary glucose levels induced mitochondrial swelling in germ and muscle cells.
  • HGD altered the enzymatic activities of mitochondrial respiratory complexes in a complex pattern.
  • Downregulation of ceramide synthases (hyl-1, hyl-2) and antioxidant genes (gcs-1, gst-4) was observed.
  • Upregulation of mitophagy genes (pink-1, dct-1) suggests a mitohormetic response.

Conclusions:

  • High-glucose diets induce mitochondrial dysfunction and cellular stress in C. elegans.
  • The observed gene expression changes indicate a complex adaptive response to glucose toxicity.
  • Mitophagy activation may serve as a protective mechanism against glucose-induced cellular damage.