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Lipid-Laden Microglia: Characterization and Roles in Diseases
Jiani Xing1,2, Takese McKenzie1,3, Jian Hu1,2,3,4
1Department of Cancer Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77054, USA.
Abstract:
Microglia are resident phagocytes of the central nervous system that play an essential role in brain development and homeostasis. When the intracellular lipid content exceeds the metabolic capacity of microglia, lipid droplets accumulate, giving rise to a distinct population termed lipid-laden microglia (LLMs). LLMs have been implicated in various neuroinflammatory and neurodegenerative diseases, functioning as both regulators/indicators of inflammation and potential therapeutic targets. This review summarizes the current research on LLMs, focusing on disease-specific regulators and functions, protective roles, interactions with neighboring cells, and advances in diagnostic and analytical tools. We also discuss the blurred distinction between LLMs and macrophages, inconsistent terminology, and major knowledge gaps across different disease contexts. Deciphering the composition, formation, and dynamics of lipid droplets in microglia is critical for uncovering how microglial states shift under diverse pathological stimuli. A clearer view of these mechanisms may reveal novel roles of LLMs and open new avenues for therapeutic intervention.
Insights
Lipid-laden microglia (LLMs) accumulate excess lipids, impacting brain health in neurodegenerative diseases. Understanding LLM functions and interactions is key to developing new therapeutic strategies for brain disorders.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia, the brain's resident immune cells, are crucial for neural development and homeostasis.
- Accumulation of intracellular lipids leads to the formation of lipid-laden microglia (LLMs).
- LLMs are increasingly recognized for their roles in neuroinflammation and neurodegenerative conditions.
Purpose of the Study:
- To review current research on lipid-laden microglia (LLMs).
- To explore disease-specific functions, protective roles, and cellular interactions of LLMs.
- To highlight advancements in diagnostic tools and identify knowledge gaps.
Main Methods:
- Literature review of studies on microglia and lipid metabolism.
- Analysis of research on LLMs in various neuroinflammatory and neurodegenerative diseases.
- Discussion of diagnostic and analytical techniques for studying LLMs.
Main Results:
- LLMs are implicated in regulating and indicating neuroinflammation.
- The distinction between LLMs and macrophages is often blurred, with inconsistent terminology.
- Significant knowledge gaps exist regarding LLM dynamics across different disease contexts.
Conclusions:
- Deciphering lipid droplet composition, formation, and dynamics in microglia is critical for understanding pathological shifts.
- Further research into LLMs may reveal novel therapeutic targets for neurological disorders.
- Clarifying LLM roles can open new avenues for therapeutic interventions in brain diseases.
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