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Author Notes:

Address correspondence and reprint requests to Lary Walker, Yerkes National Primate Research Center, Emory University, 954 Gatewood Road, Atlanta, GA, 30329 USA, lary.walker@emory.edu

The first two authors contributed equally

Subject:

Research Funding:

This work was supported by NIH P51RR-000165, P50AG025688, University of Kentucky Faculty Support Grant 1012101660, the CART Foundation, the Competence Network on Degenerative Dementias (BMBF-01GI0705) and the BMBF in the frame of ERA-Net NEURON (MIPROTRAN).

Keywords:

  • Alzheimer
  • amyloid
  • prion
  • proteopathy
  • senile plaques
  • transgenic rat

Exogenous seeding of cerebral β-amyloid deposition in βAPP-transgenic rats

Tools:

Journal Title:

Journal of Neurochemistry

Volume:

Volume 120, Number 5

Publisher:

, Pages 660-666

Type of Work:

Article | Post-print: After Peer Review

Abstract:

Deposition of the Aβ peptide in senile plaques and cerebral Aβ angiopathy can be stimulated in Aβ-precursor protein-transgenic mice by the intracerebral injection of dilute brain extracts containing aggregated Aβ seeds. Growing evidence implicates a prion-like mechanism of corruptive protein templating in this phenomenon, in which aggregated Aβ itself is the seed. Unlike prion disease, which can be induced de novo in animals that are unlikely to spontaneously develop the disease, previous experiments with Aβ seeding have employed animal models that, as they age, eventually will generate Aβ lesions in the absence of seeding. In the present study, we first established that a transgenic rat model expressing human Aβ-precursor protein (APP21 line) does not manifest endogenous deposits of Aβ within the course of its median lifespan (30 months). Next, we injected 3-month-old APP21 rats intrahippocampally with dilute Alzheimer brain extracts containing aggregated Aβ. After a 9-month incubation period, these rats had developed senile plaques and cerebral Aβ angiopathy in the injected hippocampus, whereas control rats remained free of such lesions. These findings underscore the co-dependence of agent and host in governing seeded protein aggregation, and show that cerebral Aβ-amyloidosis can be induced even in animals that are relatively refractory to the spontaneous origination of parenchymal and vascular deposits of Aβ.

Copyright information:

© 2011 The Authors. Journal of Neurochemistry © 2011 International Society for Neurochemistry

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