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The Dual Nature of Microglia in Alzheimer's Disease: A Microglia-Neuron Crosstalk Perspective
Abstract:
Microglia are critical players in the neuroimmune system, and their involvement in Alzheimer's disease (AD) pathogenesis is increasingly being recognized. However, whether microglia play a positive or negative role in AD remains largely controversial and the precise molecular targets for intervention are not well defined. This partly results from the opposing roles of microglia in AD pathology, and is mainly reflected in the microglia-neuron interaction. Microglia can prune synapses resulting in excessive synapse loss and neuronal dysfunction, but they can also promote synapse formation, enhancing neural network plasticity. Neuroimmune crosstalk accelerates microglial activation, which induces neuron death and enhances the microglial phagocytosis of β-amyloid to protect neurons. Moreover, microglia have dual opposing roles in developing the major pathological features in AD, such as amyloid deposition and blood-brain barrier permeability. This review summarizes the dual opposing role of microglia in AD from the perspective of the interaction between neurons and microglia. Additionally, current AD treatments targeting microglia and the advantages and disadvantages of developing microglia-targeted therapeutic strategies are discussed.
Insights
Microglia have dual roles in Alzheimer's disease (AD), impacting neuron health and amyloid pathology. Understanding these complex interactions is key for developing effective AD treatments targeting microglia.
Area of Science:
- Neuroimmunology
- Neuroscience
- Pathology
Background:
- Microglia are key immune cells in the brain, increasingly implicated in Alzheimer's disease (AD) pathogenesis.
- The precise role of microglia in AD remains controversial, with evidence suggesting both beneficial and detrimental effects.
- Microglia-neuron interactions are central to understanding AD pathology and potential therapeutic targets.
Purpose of the Study:
- To review the dual and opposing roles of microglia in Alzheimer's disease.
- To examine the impact of microglia-neuron interactions on AD pathogenesis.
- To discuss current and future therapeutic strategies targeting microglia for AD treatment.
Main Methods:
- Literature review of studies investigating microglia function in AD.
- Analysis of neuroimmune crosstalk and its effects on neuronal health.
- Evaluation of microglia's role in amyloid deposition and blood-brain barrier integrity.
Main Results:
- Microglia exhibit opposing functions, including synaptic pruning (detrimental) and synapse formation (beneficial).
- Neuroimmune interactions can lead to neuroinflammation, neuronal death, and altered amyloid-beta phagocytosis.
- Microglia influence major AD pathologies like amyloid plaques and blood-brain barrier permeability.
Conclusions:
- Microglia play a complex, dual role in Alzheimer's disease, necessitating a nuanced therapeutic approach.
- Targeting microglia-neuron interactions offers potential for novel AD treatment strategies.
- Further research is needed to define precise molecular targets for microglia-based AD therapies.
