Transmission of cerebral amyloid pathology by peripheral administration of misfolded Aβ aggregates

Rodrigo Morales, Javiera Bravo-Alegria, Ines Moreno-Gonzalez, Claudia Duran-Aniotz, Nazaret Gamez, George Edwards, Claudio Soto

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Previous reports showed that brain Aβ amyloidosis can be induced in animal models by exogenous administration of pre-formed aggregates. To date, only intra-peritoneal and intra-venous administrations are described as effective means to peripherally accelerate brain Aβ amyloidosis by seeding. Here, we show that cerebral accumulation of Aβ can be accelerated after exposing mouse models of Alzheimer’s disease (AD) to Aβ seeds by different peripheral routes of administration, including intra-peritoneal and intra-muscular. Interestingly, animals receiving drops of brain homogenate laden with Aβ seeds in the eyes were efficiently induced. On the contrary, oral administration of large quantities of brain extracts from aged transgenic mice and AD patients did not have any effect in brain pathology. Importantly, pathological induction by peripheral administration of Aβ seeds generated a large proportion of aggregates in blood vessels, suggesting vascular transport. This information highlights the role of peripheral tissues and body fluids in AD-related pathological changes.

Original languageEnglish
Pages (from-to)5690-5701
Number of pages12
JournalMolecular Psychiatry
Volume26
Issue number10
DOIs
StatePublished - Oct 2021

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