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Metabolic Reprograming of Microglia in the Regulation of the Innate Inflammatory Response
Clotilde Lauro1, Cristina Limatola2,3
1Department of Physiology and Pharmacology, Sapienza University of Rome, Rome, Italy.
Abstract:
Microglia sustain normal brain functions continuously monitoring cerebral parenchyma to detect neuronal activities and alteration of homeostatic processes. The metabolic pathways involved in microglia activity adapt at and contribute to cell phenotypes. While the mitochondrial oxidative phosphorylation is highly efficient in ATP production, glycolysis enables microglia with a faster rate of ATP production, with the generation of intermediates for cell growth and cytokine production. In macrophages, pro-inflammatory stimuli induce a metabolic switch from oxidative phosphorylation to glycolysis, a phenomenon similar to the Warburg effect well characterized in tumor cells. Modification of metabolic functions allows macrophages to properly respond to a changing environment and many evidence suggest that, similarly to macrophages, microglial cells are capable of a plastic use of energy substrates. Neuroinflammation is a common condition in many neurodegenerative diseases and the metabolic reprograming of microglia has been reported in neurodegeneration. Here we review the existing data on microglia metabolism and the connections with neuroinflammatory diseases, highlighting how metabolic changes contribute to module the homeostatic functions of microglia.
Insights
Microglia, the brain's immune cells, alter their energy metabolism to adapt to changing conditions. This metabolic flexibility is crucial for brain homeostasis and is implicated in neuroinflammatory diseases.
Area of Science:
- Neuroscience
- Cell Biology
- Immunology
Background:
- Microglia are essential for maintaining brain homeostasis through continuous monitoring.
- Microglial metabolic pathways, including oxidative phosphorylation and glycolysis, influence cell phenotypes and functions.
- Metabolic reprogramming is observed in microglia during neuroinflammation, similar to macrophages and tumor cells.
Purpose of the Study:
- To review current data on microglia metabolism.
- To explore the link between microglial metabolic changes and neuroinflammatory diseases.
- To highlight the role of metabolic alterations in modulating microglial homeostatic functions.
Main Methods:
- Literature review of existing data on microglia metabolism.
- Analysis of studies investigating microglial metabolic reprogramming in neurodegeneration.
- Synthesis of evidence connecting metabolic pathways to microglial function in neuroinflammation.
Main Results:
- Microglia exhibit metabolic plasticity, utilizing different energy substrates like glycolysis for rapid ATP production and biosynthesis.
- Pro-inflammatory stimuli can induce a metabolic switch in microglia, favoring glycolysis over oxidative phosphorylation.
- Metabolic changes in microglia are increasingly recognized as a key factor in the pathogenesis of neurodegenerative and neuroinflammatory conditions.
Conclusions:
- Microglial metabolic flexibility is a critical determinant of their homeostatic and inflammatory functions.
- Targeting microglial metabolism presents a potential therapeutic strategy for neuroinflammatory diseases.
- Further research into microglial metabolic pathways is essential for understanding and treating brain disorders.
