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Observations in APP Bitransgenic Mice Suggest thatDiffuse and Compact Plaques Form via IndependentProcesses in Alzheimer’s Disease
Uppsala University.
Uppsala University.
Linköping University, Department of Physics, Chemistry and Biology, Organic Chemistry. Linköping University, The Institute of Technology.
Uppsala University.
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2011 (English)In: American Journal of Pathology, ISSN 0002-9440, E-ISSN 1525-2191, Vol. 178, no 5, 2286-2298 p.Article in journal (Refereed) Published
Abstract [en]

Studies of familial Alzheimer's disease suggest that misfolding and aggregation of amyloid-β (Aβ) peptides initiate the pathogenesis. The Arctic mutation of Aβ precursor protein (APP) results in AD, and Arctic Aβ is more prone to form Aβ protofibrils and extracellular deposits. Herein is demonstrated that the burden of diffuse Aβ deposits but not compact plaques is increased when tg-Swe mice are crossed with tg-ArcSwe mice synthesizing low levels of Arctic Aβ. The diffuse deposits in bitransgenic mice, which contain primarily wild-type Aβ42, accumulate in regions both with and without transgene expression. However, APP processing, when compared with tg-Swe, remains unchanged in young bitransgenic mice, whereas wild-type Aβ42 aggregation is accelerated and fibril architecture is altered in vitro and in vivo when a low level of Arctic Aβ42 is introduced. Thus, the increased number of diffuse deposits is likely due to physical interactions between Arctic Aβ and wild-type Aβ42. The selective increase of a single type of parenchymal Aβ deposit suggests that different pathways lead to formation of diffuse and compact plaques. These findings could have general implications for Alzheimer's disease pathogenesis and particular relevance to patients heterozygous for the Arctic APP mutation. Moreover, it further illustrates how Aβ neuropathologic features can be manipulated in vivo by mechanisms similar to those originally conceptualized in prion research.

Place, publisher, year, edition, pages
Elsevier, 2011. Vol. 178, no 5, 2286-2298 p.
National Category
Cell and Molecular Biology
URN: urn:nbn:se:liu:diva-73485DOI: 10.1016/j.ajpath.2011.01.052ISI: 000298306800034PubMedID: 21514441OAI: diva2:473030
funding agencies|Uppsala University, Landstinget i Uppsala Ian||Swedish Brain Fund||Alzheimerfonden||Demensfonden||Gamla Tjanarinnor||Gun och Bertil Stohnes Stiftelse||Magnus Bergvall||Ahlensstiftelsen||Lars Hierta||Lundstroms Minne||Frimurarstiftelsen||Svenska Lakaresallskapet||Swedish Research Council| 2009-4389 2008-4169 2009-5343 |Swedish Foundation for Strategic Research||Knut and Alice Wallenberg Foundation||Linkoping University||European Union||European Research Council||Astrid and Georg Olsson||Available from: 2012-01-04 Created: 2012-01-04 Last updated: 2014-04-08

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