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Multimodal Chemical Imaging of Amyloid Plaque Polymorphism Reveals A beta Aggregation Dependent Anionic Lipid Accumulations and Metabolism

Artikel i vetenskaplig tidskrift
Författare Wojciech Michno
Ibrahim Kaya
S. Nystrom
Laurent Guerard
K. P. R. Nilsson
P. Hammarstrom
Kaj Blennow
Henrik Zetterberg
Jörg Hanrieder
Publicerad i Analytical Chemistry
Volym 90
Nummer/häfte 13
Sidor 8130-8138
ISSN 0003-2700
Publiceringsår 2018
Publicerad vid Institutionen för neurovetenskap och fysiologi, sektionen för psykiatri och neurokemi
Sidor 8130-8138
Språk en
Länkar dx.doi.org/10.1021/acs.analchem.8b0...
Ämnesord immunoprecipitation-mass-spectrometry, alzheimers-disease, microglial, response, cerebrospinal-fluid, apolipoprotein-e, transgenic mice, diffuse plaques, protein smsr, mouse model, ceramide, Chemistry
Ämneskategorier Neurovetenskaper

Sammanfattning

Amyloid plaque formation constitutes one of the main pathological hallmarks of Alzheimer's disease (AD) and is suggested to be a critical factor driving disease pathogenesis. Interestingly, in patients that display amyloid pathology but remain cognitively normal, A beta deposits are predominantly of diffuse morphology suggesting that cored plaque formation is primarily associated with cognitive deterioration and AD pathogenesis. Little is known about the molecular mechanism responsible for conversion of monomeric A beta into neurotoxic aggregates and the predominantly cored deposits observed in AD. The structural diversity among A beta plaques, including cored/compact- and diffuse, may be linked to their distinct A beta profile and other chemical species including neuronal lipids. We developed a novel, chemical imaging paradigm combining matrix assisted laser desorption/ionization imaging mass spectrometry (MALDI IMS) and fluorescent amyloid staining. This multimodal imaging approach was used to probe the lipid chemistry associated with structural plaque heterogeneity in transgenic AD mice (tgAPP(Swe)) and was correlated to A beta profiles determined by subsequent laser microdissection and immunoprecipitation-mass spectrometry. Multivariate image analysis revealed an inverse localization of ceramides and their matching metabolites to diffuse and cored structures within single plaques, respectively. Moreover, phosphatidylinositols implicated in AD pathogenesis, were found to localize to the diffuse A beta structures and correlate with A beta 1-42. Further, lysophospholipids implicated in neuroinflammation were increased in all A beta deposits. The results support previous clinical findings on the importance of lipid disturbances in AD pathophysiology and associated sphingolipid processing. These data highlight the potential of multimodal imaging as a powerful technology to probe neuropathological mechanisms.

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