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Published on: January 30, 2014
Lactic acid regulates lipid droplet aggregation through a microglia-neuron axis in neuroinflammation
Zhuoqing Lan1, Shukai Lv2, Ziyi Ge3
1Department of Anesthesiology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China; Fourth Affiliated Hospital, School of Medicine, Zhejiang University, Yiwu, China.
Abstract:
Neuroinflammation, marked by the release of proinflammatory cytokines and resulting neuronal death, is a multifaceted process extending beyond traditional inflammatory pathways. Microglia, primary cells in the inflammatory response, rapidly activate during neuroinflammation and produce proinflammatory and cytotoxic factors that affect neuronal function. Recent evidence highlights the significant role of abnormal lipid droplet (LD) deposition in the pathogenesis of neuroinflammation. While microglia are known to influence LD aggregation during neuroinflammation, the regulatory mechanism within neurons is not well understood. Our study demonstrates that lipopolysaccharide-activated microglia induce the accumulation of LD in neurons, identifying microglial-derived lactic acid as a key mediator in this process. Excessive lipid accumulation threatens neuronal function, a phenomenon reversed by eliminating microglia. Our study demonstrates that lipopolysaccharide-activated microglia induce the accumulation of LD in neurons, identifying microglial-derived lactic acid as a key mediator in this process. Excessive lipid accumulation threatens neuronal function, a phenomenon reversed by eliminating microglia.
Insights
Microglia activation during neuroinflammation causes lipid droplet accumulation in neurons. Microglial-derived lactic acid mediates this, impairing neuronal function, but this effect is reversible by removing microglia.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Neuroinflammation involves microglia activation and cytokine release, leading to neuronal death.
- Abnormal lipid droplet (LD) deposition is increasingly recognized in neuroinflammation pathogenesis.
- The precise mechanisms by which microglia influence neuronal lipid accumulation remain unclear.
Purpose of the Study:
- To investigate the role of microglia in neuronal lipid droplet accumulation during neuroinflammation.
- To identify the specific mediators involved in microglial-induced neuronal lipid deposition.
- To assess the functional consequences of altered lipid metabolism in neurons.
Main Methods:
- Utilized lipopolysaccharide (LPS) to activate microglia in a cellular model.
- Quantified lipid droplet accumulation in neurons following microglial activation.
- Investigated the role of microglial-derived factors, specifically lactic acid.
- Assessed neuronal function and the impact of microglial elimination.
Main Results:
- LPS-activated microglia induced significant accumulation of lipid droplets in neurons.
- Microglial-derived lactic acid was identified as a key mediator of this LD accumulation.
- Excessive lipid accumulation negatively impacted neuronal function.
- Elimination of microglia reversed the lipid accumulation and restored neuronal function.
Conclusions:
- Microglia play a critical role in mediating neuronal lipid droplet accumulation during neuroinflammation.
- Lactic acid is a key microglial-derived factor contributing to neuroinflammatory lipid dysregulation.
- Targeting microglial-derived lactic acid may offer therapeutic strategies for neuroinflammatory conditions.
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