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Proinflammatory microglia alter brain energy metabolism by changing the lactate/glucose ratio, supporting neuronal function during moderate inflammation. Metabolic flexibility protects neuronal networks from substrate availability changes.

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Area of Science:

  • Neuroscience
  • Cellular Metabolism
  • Neuroinflammation

Background:

  • Microglia, the brain's immune cells, can adopt different functional states.
  • These states involve metabolic reprogramming, affecting energy substrate availability in the brain.
  • The impact of microglia on neuronal energy metabolism during neuroinflammation is not well understood.

Purpose of the Study:

  • To investigate how microglia influence brain energy metabolism during neuroinflammation.
  • To understand the mechanisms behind microglia-mediated metabolic disturbances.
  • To assess the consequences for neuronal network function.

Main Methods:

  • Molecular profiling
  • Electrophysiology
  • Oxygen microsensor recordings
  • Mathematical modeling of neuronal energetics

Main Results:

  • Proinflammatory microglia transiently increase the tissue lactate/glucose ratio via transcriptional reprogramming.
  • This metabolic shift supports neuronal network activity, such as gamma oscillations, through increased mitochondrial ATP production.
  • Kinetic modeling revealed that high energy demand and low glucose availability can challenge neuronal metabolic health during severe inflammation.

Conclusions:

  • Microglia play a critical role in modulating brain energy metabolism during neuroinflammation.
  • Metabolic flexibility in neurons is crucial for maintaining network function under altered substrate availability.
  • These findings highlight the intricate relationship between immune cells, metabolism, and neuronal function in the brain.