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The role of microglia in the development of neurodegeneration
Aigul R Saitgareeva1, Kirill V Bulygin2,3, Ilgiz F Gareev1
1Bashkir State Medical University, Ufa, Russian Federation.
Abstract:
Microglia-mediated central nervous system (CNS) inflammation is one of the key features of various neurodegenerative diseases, including Parkinson's and Alzheimer's diseases. In the last few years, a number of studies have investigated the link between neurodegenerative diseases and CNS glial cells, in particular microglia. Microglial cells are the main resident immune cells and comprise approximately 10-15% of all CNS cells. Microglia at rest regulates CNS homeostasis via phagocytic activity, by removing pathogens and cell detritus. "Resting" microglia cells transform into an activated form and produce inflammatory mediators, thus protecting neurons and providing defense against invading pathogens. Excessive inflammation leads to neuronal damage and neurodegenerative diseases. Various microglial reactions at different stages of the disease can open up new directions for treatment interventions and modification of the inflammatory activity. This review focuses on the potential role of microglia and the dynamic M1/M2 phenotype changes that are critically linked to certain neurodegenerative diseases.
Insights
Microglia, the brain's immune cells, play a dual role in neurodegenerative diseases like Alzheimer's. Understanding their inflammatory M1/M2 states offers new therapeutic targets.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Central nervous system (CNS) inflammation, driven by microglia, is central to neurodegenerative diseases such as Parkinson's and Alzheimer's.
- Microglia are the primary immune cells in the CNS, regulating homeostasis and defense through phagocytosis and inflammatory mediator release.
- Dysregulated microglial activation and excessive inflammation contribute to neuronal damage and disease progression.
Purpose of the Study:
- To review the critical role of microglia in neurodegenerative diseases.
- To explore the dynamic changes in microglial M1/M2 phenotypes and their link to disease pathology.
- To highlight potential therapeutic strategies targeting microglial inflammatory activity.
Main Methods:
- Literature review of recent studies on microglia and neurodegeneration.
- Analysis of microglial activation states and their phenotypic transitions (M1/M2).
- Examination of the relationship between microglial function and disease progression.
Main Results:
- Microglia exhibit distinct M1 (pro-inflammatory) and M2 (anti-inflammatory/repair) phenotypes.
- The balance of M1/M2 phenotypes is crucial in modulating neuroinflammation and neuroprotection.
- Aberrant microglial responses contribute significantly to the pathogenesis of neurodegenerative conditions.
Conclusions:
- Microglial phenotype dynamics are intrinsically linked to the development and progression of neurodegenerative diseases.
- Targeting specific microglial activation states (M1/M2) presents a promising avenue for novel therapeutic interventions.
- Further research into microglial modulation could lead to effective treatments for CNS disorders.
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