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Basic Science and Pathogenesis.

Daniel Lamontagne-Kam1, Arsalan Rahimabadi2, Dainelys Guadarrama Bello1

  • 1Université de Montréal, Montréal, QC, Canada.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 23, 2025
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Summary
This summary is machine-generated.

This study investigates how non-mutated tau protein spreads in the brain, offering new insights into Alzheimer's Disease (AD) progression and neurodegeneration. Understanding tau propagation is key to early AD intervention.

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Area of Science:

  • Neuroscience
  • Pathology
  • Alzheimer's Disease Research

Background:

  • Tau pathology is a key marker of Alzheimer's Disease (AD), closely linked to neurodegeneration and cognitive decline.
  • Previous studies on tau propagation often used mutated tau or transgenic models.
  • This research focuses on the propagation of non-mutated tau, as found in AD.

Purpose of the Study:

  • To characterize the propagation patterns of non-mutated human tau in a wild-type mouse model.
  • To understand how non-mutated tau influences neurodegeneration and cognitive decline in early AD stages.

Main Methods:

  • Injected preformed fibrils of non-mutated human tau into the hippocampus of C57BL/6J mice.
  • Evaluated tau propagation at various time points after single and chronic injections.
  • Utilized fluorescent antibodies and confocal microscopy to analyze propagation and neurodegeneration patterns.

Main Results:

  • Observed tau hyperphosphorylation in the CA1 hippocampal region in positive controls.
  • Compiled 3D models to visualize tau propagation dynamics over time.
  • Established patterns of tau spread and associated neurodegeneration.

Conclusions:

  • Investigating non-mutated tau propagation in a wild-type mouse model provides crucial insights into early AD mechanisms.
  • This research offers a more relevant model for understanding tau's role in AD pathogenesis.
  • Findings contribute to understanding how tau influences neurodegeneration and cognitive decline in the initial phases of AD.