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[Microglial Phagocytosis in the Neurodegenerative Diseases]
Sheng-nan Cao1, Xiu-qi Bao1, Hua Sun1
1State Key Laboratory of Natural Products and Functions,Institute of Materia Medica,CAMS and PUMC,Beijing 100050,China;
Abstract:
Microglia are the resident innate immune cells in the brain. Under endogenous or exogenous stimulates, they become activated and play an important role in the neurodegenerative diseases. Microglial phagocytosis is a process of receptor-mediated engulfment and degradation of apoptotic cells. In addition, microglia can phagocyte brain-specific cargo, such as myelin debris and abnormal protein aggregation. However, recent studies have shown that microglia can also phagocyte stressed-but-viable neurons, causing loss of neurons in the brain. Thus, whether microglial phagocytosis is beneficial or not in neurodegenerative disease remains controversial. This article reviews microglial phagocytosis related mechanisms and its potential roles in neurodegenerative diseases, with an attempt to provide new insights in the treatment of neurodegenerative diseases.
Insights
Microglia, the brain's immune cells, can engulf neurons, complicating their role in neurodegenerative diseases. Understanding microglial phagocytosis is key to developing new treatments.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are the brain's resident immune cells, crucial in neuroinflammation.
- Microglial phagocytosis clears cellular debris and protein aggregates.
- Recent findings indicate microglia can engulf stressed, viable neurons, raising concerns.
Purpose of the Study:
- To review mechanisms of microglial phagocytosis.
- To explore the dual role of microglial phagocytosis in neurodegenerative diseases.
- To offer insights for novel therapeutic strategies.
Main Methods:
- Literature review of microglial phagocytosis.
- Analysis of studies on microglial interactions with neurons.
- Synthesis of current understanding of phagocytosis in neurodegeneration.
Main Results:
- Microglia phagocytose apoptotic cells, debris, and protein aggregates.
- Microglial phagocytosis of viable neurons contributes to neuronal loss.
- The net effect of microglial phagocytosis in neurodegeneration is context-dependent.
Conclusions:
- Microglial phagocytosis presents a double-edged sword in neurodegenerative conditions.
- Targeting microglial phagocytosis pathways may offer therapeutic benefits.
- Further research is needed to harness beneficial microglial functions while mitigating detrimental ones.
