Acta Neuropathologica

, Volume 123, Issue 1, pp 31–37

The presence of Aβ seeds, and not age per se, is critical to the initiation of Aβ deposition in the brain

  • Tsuyoshi Hamaguchi
  • Yvonne S. Eisele
  • Nicholas H. Varvel
  • Bruce T. Lamb
  • Lary C. Walker
  • Mathias Jucker
Original Paper

Abstract

The deposition of the β-amyloid (Aβ) peptide in senile plaques and cerebral Aβ-amyloid angiopathy can be seeded in β-amyloid precursor protein (APP)-transgenic mice by the intracerebral infusion of brain extracts containing aggregated Aβ. Previous studies of seeded β-amyloid induction have used relatively short incubation periods to dissociate seeded β-amyloid induction from endogenous β-amyloid deposition of the host, thus precluding the analysis of the impact of age and extended incubation periods on the instigation and spread of Aβ lesions in brain. In the present study using R1.40 APP-transgenic mice (which do not develop endogenous Aβ deposition up to 15 months of age) we show that: (1) seeding at 9 months of age does not induce more Aβ deposition than seeding at 3 months of age, provided that the incubation period (6 months) is the same; and (2) very long-term (12 months) incubation after a focal application of the seed results in the emergence of Aβ deposits throughout the forebrain. These findings indicate that the presence of Aβ seeds, and not the age of the host per se, is critical to the initiation of Aβ aggregation in the brain, and that Aβ deposition, actuated in one brain area, eventually spreads throughout the brain.

Keywords

Alzheimer Amyloid Prion Seeding Senile plaques Transgenic mouse 

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Tsuyoshi Hamaguchi
    • 1
    • 2
  • Yvonne S. Eisele
    • 1
    • 2
  • Nicholas H. Varvel
    • 1
    • 2
  • Bruce T. Lamb
    • 3
  • Lary C. Walker
    • 4
  • Mathias Jucker
    • 1
    • 2
  1. 1.Department of Cellular NeurologyHertie-Institute for Clinical Brain Research, University of TübingenTübingenGermany
  2. 2.DZNE, German Center for Neurodegenerative DiseasesTübingenGermany
  3. 3.The Lerner Research Institute, The Cleveland Clinic FoundationClevelandUSA
  4. 4.Department of Neurology, Yerkes National Primate Research CenterEmory UniversityAtlantaUSA

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