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Juana Andreo-Lopez1, Miriam Bettinetti-Luque1, Cynthia Campos-Moreno1

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Summary

Human Alzheimer's disease seeds cause more amyloid aggregation and inflammation than mouse seeds. Understanding seed origin is key for developing targeted Alzheimer's therapies.

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Area of Science:

  • Neuroscience
  • Pathology
  • Immunology

Background:

  • Alzheimer's disease (AD) is a neurodegenerative disorder characterized by amyloid-beta (Aβ) plaques and tau tangles.
  • Aβ aggregates may propagate in a prion-like manner, with seed origin influencing pathogenicity.
  • Microglia play a critical role in AD pathogenesis, but their precise involvement with Aβ seeds requires further investigation.

Purpose of the Study:

  • To investigate the differential effects of human AD brain-derived and mouse model-derived amyloid seeds.
  • To analyze the impact of seed origin on Aβ and tau propagation.
  • To assess the differential inflammatory responses induced by various amyloid seeds.

Main Methods:

  • Amyloid seeds from human AD patients and transgenic mice were stereotactically injected into the hippocampus of 3xTg-AD mice.
  • Mice were analyzed 10 months post-surgery for amyloid and microglia markers.
  • Differential aggregation patterns and inflammatory responses were evaluated.

Main Results:

  • Human-derived seeds induced distinct aggregation patterns, leading to more amyloid aggregates and fewer neurofibrillary tangles compared to mouse-derived seeds.
  • Human and mouse seeds differentially modulated plaque-associated microglia.
  • Mouse-derived seeds promoted more neuritic pathology in recipient mice.

Conclusions:

  • Human-derived amyloid seeds exhibit greater aggregation potential and elicit a stronger inflammatory response than mouse-derived seeds.
  • The origin of amyloid seeds significantly influences their pathogenic effects and the host's inflammatory response.
  • These findings highlight the importance of seed source in AD pathogenesis and may inform the development of targeted therapies.