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The biphasic role of microglia in Alzheimer's disease
1Department of Neuroimmunology, Research Institute of Environmental Medicine, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.
Abstract:
Neuroinflammation is involved in the pathogenesis of Alzheimer's disease (AD). Microglia, macrophage-like resident immune cells in the brain, play critical roles in the inflammatory aspects of AD. Microglia may be activated by oligomeric and fibrillar species of amyloid β (Aβ) that are constituents of senile plaques and by molecules derived from degenerated neurons, such as purines and chemokines, which enhance their migration and phagocytosis. The main neurotoxic molecules produced by activated microglia may be reactive oxygen species, glutamate, and inflammatory cytokines such as tumor-necrosis-factor-α and interleukin- (IL-) 1β These molecules differentially induce neurotoxicity. Aβ itself directly damages neurons. In terms of neuroprotective properties, microglia treated with fractalkine or IL-34 attenuate Aβ neurotoxicity by Aβ clearance and the production of antioxidants. Therefore, regulation of the microglial role in neuroprotection may be a useful therapeutic strategy for AD.
Insights
Microglia, brain immune cells, contribute to Alzheimer's disease (AD) pathogenesis by releasing neurotoxic molecules. However, modulating microglia may offer a therapeutic strategy for AD by reducing amyloid-beta toxicity.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Neuroinflammation is a key factor in Alzheimer's disease (AD) development.
- Microglia, the brain's resident immune cells, are central to AD's inflammatory processes.
- Microglial activation is triggered by amyloid-beta (Aβ) aggregates and neuronal debris.
Purpose of the Study:
- To elucidate the dual role of microglia in Alzheimer's disease pathogenesis.
- To investigate how microglia are activated and contribute to neurotoxicity.
- To explore the potential of microglial modulation as a therapeutic strategy for AD.
Main Methods:
- Review of current literature on microglial function in AD.
- Analysis of molecular mechanisms underlying microglial activation and neurotoxicity.
- Examination of factors influencing microglial neuroprotective versus neurotoxic activities.
Main Results:
- Activated microglia produce neurotoxic factors like reactive oxygen species, glutamate, and inflammatory cytokines (e.g., TNF-α, IL-1β).
- Amyloid-beta (Aβ) species directly contribute to neuronal damage.
- Microglia treated with fractalkine or IL-34 can reduce Aβ neurotoxicity via clearance and antioxidant production.
Conclusions:
- Microglia exhibit both detrimental and beneficial roles in Alzheimer's disease.
- Targeting microglial pathways, particularly their neuroprotective functions, presents a promising therapeutic avenue for AD.
- Regulating microglial responses could be a viable strategy to combat AD progression.
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