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.
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Acknowledgements
The authors would like to thank Mrs. Andrea Flores-Ramirez for animal care and genotyping. This work was supported by grants from the NIH (RF1 AG061069 to CS and RF1 AG059321 to CS and RM), the Alzheimer’s Association (MNIRGD-12-243075 and NIRGD-15-363554 to RM, NIRP-12-257323 to IM-G and AARG-591107 to CDA), grants from ANID (ANID/FONDEF ID20I10152 and ANID/FONDECYT 1210622) to CDA, a grant from The Mitchell Foundation (to CS), and a Ramon y Cajal Program (RYC-2017-21879) to IM-G. We also acknowledge the use of tissues procured by the National Disease Research Interchange (NDRI) with support from NIH grant U42OD11158.
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RM and CS designed the experiments. RM, JB-A, IM-G, CD-A, NG and GEIII performed the experimental work. RM, JB-A, IM-G and CS analyzed the data. RM wrote the manuscript. All authors reviewed and approved the final version of this article.
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Morales, R., Bravo-Alegria, J., Moreno-Gonzalez, I. et al. Transmission of cerebral amyloid pathology by peripheral administration of misfolded Aβ aggregates. Mol Psychiatry 26, 5690–5701 (2021). https://doi.org/10.1038/s41380-021-01150-w
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DOI: https://doi.org/10.1038/s41380-021-01150-w
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