Purinergic Receptor P2Y12-Mediated Tau Internalization in Microglia

Area of Science:

• Neuroscience
• Immunology
• Cell Biology

Background:

• Microglia are crucial for brain surveillance and function as resident macrophages.
• In Alzheimer's disease (AD), microglia become dysregulated due to amyloid-β and Tau accumulation, contributing to neurodegeneration.
• Extracellular Tau species are implicated in microglial activation and AD pathogenesis.

Purpose of the Study:

• To investigate the role of the P2Y12 receptor in microglial uptake of extracellular Tau.
• To elucidate the mechanism of P2Y12 receptor-mediated Tau internalization and degradation.
• To understand how P2Y12 receptor signaling influences microglial responses to Tau.

Main Methods:

• Utilized cell culture models of microglia and Tau pathology.
• Investigated P2Y12 receptor expression and localization upon Tau exposure.
• Employed techniques to track Tau internalization, intracellular trafficking, and degradation.
• Analyzed P2Y12 receptor's role in actin remodeling and microglial migration.

Main Results:

• Extracellular Tau directly activates microglia via interaction with the P2Y12 receptor.
• The Tau-P2Y12 receptor complex undergoes internalization and subsequent lysosomal degradation.
• P2Y12 receptor signaling is involved in actin remodeling, essential for microglial migration and phagocytosis.
• This mechanism highlights a specific pathway for microglia to clear extracellular Tau.

Conclusions:

• P2Y12 receptor-mediated internalization is a significant mechanism for microglia to phagocytose extracellular Tau.
• Targeting the P2Y12 receptor pathway could offer therapeutic strategies for Alzheimer's disease by modulating microglial responses to Tau.