Microglia in Alzheimer's disease.

Area of Science:

• Neuroscience
• Immunology
• Cell Biology

Background:

• Microglia are essential myeloid cells in the central nervous system (CNS), performing immune surveillance and maintaining brain homeostasis.
• They act as sensors, initiating immune responses to insults and supporting tissue repair through phagocytosis and trophic factor release.
• Microglial activation, characterized by morphological and functional changes, is a hallmark of neurodegenerative diseases like Alzheimer's disease (AD).

Purpose of the Study:

• To review the critical role of microglia in the pathogenesis of Alzheimer's disease (AD).
• To explore the therapeutic potential of modulating microglial activity in AD.

Main Methods:

• This review synthesizes current research on microglial function in the CNS.
• It analyzes the dysregulation of microglial inflammatory responses and impaired clearance mechanisms in AD.
• The review discusses the dynamic interactions between microglia and the CNS environment at various disease stages.

Main Results:

• In AD, microglia exhibit heightened inflammatory activity.
• Microglial-mediated clearance functions are significantly compromised in Alzheimer's disease.
• Activated microglia are a common pathological feature across different stages of AD.

Conclusions:

• Microglial dysfunction, including increased inflammation and reduced phagocytosis, contributes significantly to AD pathogenesis.
• Targeting and modulating microglial inflammatory activities present a potential therapeutic avenue for Alzheimer's disease.
• Understanding the diverse microglial reactions in AD may lead to novel treatment strategies.