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Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry
Published on: May 5, 2022
Aging-related dysregulation of energy metabolism and mitochondrial dynamics in microglia
Yoki Nakamura1, Manaya Nakano1, Kazue Hisaoka-Nakashima1
1Department of Pharmacology, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan.
Abstract:
Microglia, the primary immune cells of the central nervous system, play a pivotal role in maintaining brain homeostasis. Recent studies have highlighted the involvement of microglial dysfunction in the pathogenesis of various age-related neurodegenerative diseases, such as Alzheimer's disease. Moreover, the metabolic state of microglia has emerged as a key factor in these diseases. Interestingly, aging and neurodegenerative diseases are associated with impaired mitochondrial function and a metabolic shift from oxidative phosphorylation to glycolysis in microglia. This metabolic shift may contribute to sustained microglial activation and neuroinflammation. Furthermore, the leakage of mitochondrial DNA into the cytoplasm, because of mitochondrial dysfunction, has been implicated in triggering inflammatory responses and disrupting brain function. This review summarizes recent advances in understanding the role of microglial metabolic shifts, particularly glycolysis, and mitochondrial dysfunction. It also explores the potential of targeting microglial metabolism, for instance by modulating mitophagy or intervening in specific metabolic pathways, as a novel therapeutic approach for changes in brain function and neurodegenerative diseases associated with aging.
Insights
Microglial metabolic shifts, especially increased glycolysis, and mitochondrial dysfunction are key in aging and neurodegenerative diseases. Targeting these pathways offers a novel therapeutic strategy for brain health.
Area of Science:
- Neuroscience
- Immunology
- Metabolism
Background:
- Microglia are central nervous system immune cells crucial for brain homeostasis.
- Microglial dysfunction is implicated in age-related neurodegenerative diseases like Alzheimer's disease.
- Microglial metabolic state is increasingly recognized as a critical factor in disease pathogenesis.
Purpose of the Study:
- To review the role of microglial metabolic shifts, particularly glycolysis, in aging and neurodegeneration.
- To summarize the impact of mitochondrial dysfunction on microglial function and brain health.
- To explore therapeutic strategies targeting microglial metabolism.
Main Methods:
- Literature review of recent advances in microglial metabolism and mitochondrial function.
- Analysis of the link between metabolic changes, inflammation, and neurodegeneration.
- Exploration of potential therapeutic interventions targeting microglial metabolic pathways.
Main Results:
- Aging and neurodegeneration are linked to impaired mitochondrial function and a shift to glycolysis in microglia.
- Mitochondrial dysfunction can lead to mitochondrial DNA leakage, triggering inflammation.
- Metabolic shifts may drive sustained microglial activation and neuroinflammation.
Conclusions:
- Microglial metabolic reprogramming, especially increased glycolysis, is a significant factor in age-related brain dysfunction.
- Mitochondrial dysfunction contributes to neuroinflammation and disease progression.
- Targeting microglial metabolism, including mitophagy and specific pathways, presents a promising therapeutic avenue for neurodegenerative diseases.
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