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Exercise increases mitochondrial glutamate oxidation in the mouse cerebral cortex.

Eric A F Herbst1,1, Graham P Holloway1,1

  • 1Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.

Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquee, Nutrition Et Metabolisme
|May 18, 2016
PubMed
Summary

Acute exercise enhances mitochondrial function in mouse brains by boosting glutamate respiration, particularly through the malate-aspartate shuttle. This finding highlights exercise

Keywords:
brain mitochondriacerebral cortexcortex cérébralexercice physiqueexerciseglutamate metabolismmitochondrie cérébralemétabolisme du glutamate

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Area of Science:

  • Neuroscience
  • Mitochondrial Biology
  • Exercise Physiology

Background:

  • Mitochondrial respiratory function is crucial for neuronal energy supply.
  • The impact of acute exercise on specific metabolic pathways in the brain remains incompletely understood.
  • Understanding brain metabolism adaptations to exercise can inform strategies for neurological health.

Purpose of the Study:

  • To investigate the effects of acute exercise on mitochondrial respiration in the mouse cerebral cortex.
  • To determine which substrates are affected by exercise-induced changes in mitochondrial function.
  • To elucidate the mechanisms underlying exercise-induced alterations in brain energy metabolism.

Main Methods:

  • Mice underwent an acute bout of exercise.
  • Mitochondrial respiratory function was assessed using high-resolution respirometry in isolated brain mitochondria.
  • Specific substrates including pyruvate, glutamate, malate, and glutamine were used to probe respiratory chain activity.

Main Results:

  • Pyruvate-stimulated mitochondrial respiration was unaffected by acute exercise.
  • Glutamate-stimulated respiration was significantly enhanced following the exercise bout.
  • This enhancement was dependent on the presence of malate, indicating a role for the malate-aspartate shuttle.
  • Substituting glutamine for glutamate abolished the exercise-induced enhancement.

Conclusions:

  • Acute exercise enhances glutamate oxidation in the mouse cerebral cortex.
  • The malate-aspartate shuttle plays a key role in mediating exercise-induced improvements in brain mitochondrial function.
  • These findings suggest that acute exercise can modulate specific metabolic pathways in neurons to support energy demands.