Shifting Microglial Phenotypes: Targeting Disease-Associated Microglia in Neurodegeneration

Area of Science:

• Neuroscience
• Immunology

Background:

• Neurodegenerative diseases involve neuron loss and cognitive decline, often driven by neuroinflammation.
• Microglia, the brain's immune cells, are central to neuroinflammation, and their dysregulation exacerbates neuronal damage.

Purpose of the Study:

• To review the dual roles of disease-associated microglia (DAMs) in neuroinflammation and neuroprotection.
• To examine the distinct transcriptional profiles of DAMs in neurodegenerative diseases.
• To explore the implications of DAM function for therapeutic development.

Main Methods:

• Literature review focusing on microglial roles in neurodegeneration.
• Analysis of disease-associated microglia (DAM) functions, including phagocytosis and cytokine release.
• Examination of specific neurodegenerative diseases: Alzheimer's disease (AD), Parkinson's disease (PD), and amyotrophic lateral sclerosis (ALS).

Main Results:

• Disease-associated microglia (DAMs) exhibit a dual role, contributing to both inflammation and debris clearance.
• DAMs possess unique transcriptional profiles that differ across neurodegenerative conditions.
• Key activation pathways, such as the TREM2-APOE pathway, are implicated in DAMs' role.

Conclusions:

• Comprehending the complex, dual functions of DAMs is essential for targeted therapeutic strategies.
• Further research into DAM interactions within neurodegenerative diseases can guide future treatment development.
• Targeting DAMs offers a promising avenue for managing neuroinflammation and neuroprotection.