Mitochondrial complex I activity in microglia sustains neuroinflammation

Area of Science:

• Neuroscience
• Immunology
• Mitochondrial Biology

Background:

• Sustained myeloid cell activation is a hallmark of chronic neurological diseases like multiple sclerosis.
• Metabolic and mitochondrial features influence myeloid cell activation and function, but their role in perpetuating central nervous system inflammation is unclear.

Purpose of the Study:

• To identify the molecular signature sustaining microglia activation.
• To investigate the role of mitochondrial activity in neuroinflammation.
• To explore therapeutic strategies targeting microglial metabolism.

Main Methods:

• Multiomics approach to identify molecular signatures.
• Investigation of mitochondrial complex I activity in microglia.
• In vivo animal model of a central nervous system disease.

Main Results:

• A molecular signature sustaining microglia activation was identified, driven by mitochondrial complex I activity.
• This activity leads to reverse electron transport and reactive oxygen species production.
• Blocking complex I in pro-inflammatory microglia protected the central nervous system and improved functional outcomes in an animal model.

Conclusions:

• Mitochondrial complex I activity sustains microglia activation and neuroinflammation.
• Targeting complex I in microglia offers a potential therapeutic strategy for neuroprotection in chronic central nervous system inflammatory disorders.