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Author Spotlight: In Vitro Co-Culture Model for Studying Microglia-Neuronal Interactions in Disease Conditions
Published on: July 26, 2024
Microglia Polarization in Alzheimer's Disease: Mechanisms and a Potential Therapeutic Target
Qinqin Wang1, Hongmei Yao2, Wenyan Liu3
1Shandong Collaborative Innovation Center for Diagnosis, Treatment and Behavioral Interventions of Mental Disorders, Institute of Mental Health, Jining Medical University, Jining, China.
Abstract:
Neuroinflammation regulated by microglia is one of the important factors involved in the pathogenesis of Alzheimer's disease (AD). Activated microglia exhibited phenotypes termed as M1 and M2 phenotypes separately. M1 microglia contribute to the development of inflammation via upregulating pro-inflammatory cytokines, while M2 microglia exert anti-inflammation effects through enhancing the expression of anti-inflammation factors. Moreover, M1 and M2 microglia could be mutually transformed under various conditions. Both M1 and M2 microglia are implicated in AD. Amyloid-β (Aβ) and hyperphosphorylated tau are two major components of AD pathological hallmarks, neuritic plaques, and neurofibrillary tangles. Both Aβ and hyperphosphorylated tau were involved in microglial activation and subsequent inflammation, which further contribute to neuronal and synaptic loss in AD. In this review, we summarized the roles of M1 and M2 microglia in AD and underlying mechanisms, which will provide an insight into the role of microglia in the pathogenesis of AD and highlight the therapeutic potential of modulating microglia.
Insights
Microglia, immune cells in the brain, play key roles in Alzheimer's disease (AD) pathogenesis. Understanding their M1 and M2 inflammatory states offers therapeutic strategies for AD.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Neuroinflammation, driven by microglia, is central to Alzheimer's disease (AD) development.
- Microglia exist in two main activation states: M1 (pro-inflammatory) and M2 (anti-inflammatory).
- Both M1 and M2 microglia are implicated in AD, influencing disease progression.
Purpose of the Study:
- To review the distinct roles of M1 and M2 microglia in Alzheimer's disease pathogenesis.
- To elucidate the mechanisms underlying microglial activation and polarization in AD.
- To highlight the therapeutic potential of modulating microglial phenotypes in AD treatment.
Main Methods:
- Literature review of studies on microglia, neuroinflammation, and Alzheimer's disease.
- Analysis of the roles of M1 and M2 microglial phenotypes in AD.
- Examination of the impact of amyloid-beta and hyperphosphorylated tau on microglial activation.
Main Results:
- M1 microglia exacerbate inflammation by releasing pro-inflammatory cytokines.
- M2 microglia exert anti-inflammatory effects and promote tissue repair.
- Amyloid-beta and tau pathology activate microglia, contributing to neuroinflammation and neuronal loss in AD.
Conclusions:
- Microglial M1 and M2 phenotypes have opposing roles in Alzheimer's disease.
- Modulating microglial polarization presents a promising therapeutic avenue for AD.
- Further research into microglial mechanisms can yield novel AD treatments.
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