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Updated: Oct 8, 2025
Author Spotlight: In Vitro Co-Culture Model for Studying Microglia-Neuronal Interactions in Disease Conditions
Published on: July 26, 2024
The microglial P2Y6 receptor mediates neuronal loss and memory deficits in neurodegeneration
Mar Puigdellívol1, Stefan Milde2, Anna Vilalta2
1Department of Biochemistry, University of Cambridge, Cambridge CB2 1QW, UK; Department of Biomedicine, School of Medicine, Institute of Neuroscience, University of Barcelona, 08036 Barcelona, Spain.
Abstract:
Microglia are implicated in neurodegeneration, potentially by phagocytosing neurons, but it is unclear how to block the detrimental effects of microglia while preserving their beneficial roles. The microglial P2Y6 receptor (P2Y6R) - activated by extracellular UDP released by stressed neurons - is required for microglial phagocytosis of neurons. We show here that injection of amyloid beta (Aβ) into mouse brain induces microglial phagocytosis of neurons, followed by neuronal and memory loss, and this is all prevented by knockout of P2Y6R. In a chronic tau model of neurodegeneration (P301S TAU mice), P2Y6R knockout prevented TAU-induced neuronal and memory loss. In vitro, P2Y6R knockout blocked microglial phagocytosis of live but not dead targets and reduced tau-, Aβ-, and UDP-induced neuronal loss in glial-neuronal cultures. Thus, the P2Y6 receptor appears to mediate Aβ- and tau-induced neuronal and memory loss via microglial phagocytosis of neurons, suggesting that blocking this receptor may be beneficial in the treatment of neurodegenerative diseases.
Insights
Blocking the microglial P2Y6 receptor prevents neuron loss and memory deficits in Alzheimer's and tau models. This targeted approach inhibits detrimental microglial phagocytosis while preserving essential functions, offering a potential therapeutic strategy for neurodegenerative diseases.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Microglia, the brain's immune cells, play a role in neurodegeneration by phagocytosing neurons.
- The microglial P2Y6 receptor (P2Y6R), activated by UDP from stressed neurons, is crucial for this detrimental phagocytosis.
- Existing strategies lack specificity, risking the loss of beneficial microglial functions.
Purpose of the Study:
- To investigate the role of the microglial P2Y6 receptor in mediating neuronal and memory loss in neurodegenerative disease models.
- To determine if blocking P2Y6R can prevent detrimental microglial phagocytosis of neurons while preserving beneficial functions.
- To explore P2Y6R as a potential therapeutic target for neurodegenerative diseases like Alzheimer's and tauopathies.
Main Methods:
- Utilized knockout mouse models lacking the P2Y6 receptor (P2Y6R KO).
- Administered amyloid-beta (Aβ) or employed a chronic tauopathy model (P301S TAU mice).
- Conducted in vitro experiments using glial-neuronal cultures to assess microglial phagocytosis and neuronal loss.
Main Results:
- P2Y6R knockout prevented Aβ-induced microglial phagocytosis of neurons, neuronal loss, and memory deficits in mice.
- P2Y6R knockout also protected against TAU-induced neuronal and memory loss in the P301S TAU mouse model.
- In vitro, P2Y6R knockout specifically inhibited microglial phagocytosis of live neurons and reduced neuronal death induced by tau, Aβ, and UDP.
Conclusions:
- The microglial P2Y6 receptor mediates neuronal and memory loss in Aβ- and tau-driven neurodegeneration via phagocytosis of neurons.
- Blocking P2Y6R offers a promising therapeutic strategy to mitigate neurodegeneration by selectively inhibiting harmful microglial activity.
- Targeting P2Y6R may represent a novel approach for treating Alzheimer's disease and other tauopathies.
