Microglial Modulation in Alzheimer's Disease: Central Players in Neuroinflammation and Pathogenesis

Area of Science:

• Neuroscience
• Immunology
• Pathology

Background:

• Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by amyloid-β plaques and neurofibrillary tangles.
• Microglia, the brain's resident immune cells, play a critical role in AD pathogenesis.
• Microglial dysfunction is increasingly recognized as a key contributor to neuroinflammation and neurodegeneration in AD.

Purpose of the Study:

• To review the multifaceted roles of microglia in Alzheimer's disease, focusing on their contribution to neuroinflammation.
• To explore how microglial dysfunction impacts amyloid-β phagocytosis and tau hyperphosphorylation.
• To discuss current and potential therapeutic strategies targeting microglia for AD treatment.

Main Methods:

• Literature review of studies investigating microglial roles in AD.
• Analysis of molecular mechanisms, including TREM2, influencing microglial function in AD.
• Evaluation of therapeutic interventions aimed at modulating microglial activity.

Main Results:

• Microglial dysfunction exacerbates AD pathology by hindering amyloid-β clearance and promoting tau hyperphosphorylation.
• TREM2 and other molecular factors significantly influence microglial behavior and AD progression.
• Functional microglia can be neuroprotective, whereas dysfunctional microglia accelerate neurodegeneration.

Conclusions:

• Microglia are central players in AD, with their functional state dictating neuroprotective or neurodegenerative outcomes.
• Targeting microglia to reduce neuroinflammation presents a promising therapeutic avenue for AD.
• Further research is crucial to overcome challenges such as side effects, cost, and accessibility for effective microglia-based therapies.