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Basic Science and Pathogenesis.

Victor Bodart Santos1, Mohammad Abdullah1, Justice Ellison1

  • 1Mayo Clinic Florida, Jacksonville, FL, USA.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 24, 2025
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Summary
This summary is machine-generated.

Targeting P2RX7 in microglia reduces extracellular vesicle (EV) secretion and tau pathology in Alzheimer's disease (AD) models. This suggests P2RX7 as a potential therapeutic target for AD progression.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Pathological tau transfer via extracellular vesicles (EVs) is implicated in Alzheimer's disease (AD).
  • P2X purinoreceptor 7 (P2RX7) regulates EV secretion and is a potential therapeutic target for AD.
  • This study investigates the role of P2rx7 in a mouse model of tauopathy.

Purpose of the Study:

  • To investigate the therapeutic potential of targeting P2RX7 in Alzheimer's disease.
  • To examine the effect of P2rx7 deficiency on tau pathology and EV secretion in a PS19 mouse model.
  • To elucidate the role of P2RX7 in microglial activation and EV biogenesis.

Main Methods:

  • PS19:P2rx7 knockout mice were assessed for memory, brain atrophy, and tau pathology.
  • Bulk and single-cell RNA-seq (scRNA-seq) were performed on brain tissues.
  • Proteomic profiling of brain EVs and in vivo visualization of microglial EV secretion were conducted.

Main Results:

  • P2rx7 deficiency improved memory, preserved brain volume, and reduced tau pathology in PS19 mice.
  • P2rx7 deficiency downregulated a microglial and EV-related gene module correlated with tau pathology.
  • P2rx7 deficiency reduced tau-containing EV secretion and inhibited tau propagation in vivo.

Conclusions:

  • A microglial P2RX7-EV axis is implicated in neuroinflammation and neurodegeneration in tau pathology.
  • Targeting P2RX7 may be a promising therapeutic strategy to ameliorate AD progression.
  • P2RX7 plays a critical role in microglia-mediated EV secretion and tau propagation.