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Reduced retromer function results in the accumulation of amyloid-beta oligomers

Ansell-Schultz, Anna, Reyes, Juan F., Samuelsson, My, Hallbeck, Martin·2018·Molecular and Cellular Neuroscience
DOI 10.1016/j.mcn.2018.09.003
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Abstract

Alzheimer's disease (AD) is a neurodegenerative disorder characterized by a progressive loss of multiple cognitive functions. Accumulation of amyloid beta oligomers (oAβ) play a major role in the neurotoxicity associated with the disease process. One of the early affected brain regions is the hippocampus, wherein a reduction of the vacuolar protein sorting-associated protein 35 (VPS35), the core protein comprising the retromer complex involved in cellular cargo sorting, has been identified. To investigate the role of the retromer function on the accumulation and clearance of oAβ, we reduced retromer function by selectively inhibiting VPS35 gene expression using siRNA in differentiated neuronal SH-SY5Y cells. As cell-to-cell transfer of oAβ to new brain regions is believed to be important for disease progression we investigated the effect of VPS35 reduction both in cells with direct uptake of oAβ and in cells receiving oAβ from donor cells. We demonstrate that reduced retromer function increases oAβ accumulation in both cell systems, both the number of cells containing intracellular oAβ and the amount within them. This effect was shown at different time points and regardless if the oAβ originated from the extracellular milieu or via a direct neuronal cell-to-cell transfer. Interestingly, not only did reduced VPS35 cause oAβ accumulation, but oAβ treatment alone also lead to a reduction of VPS35 protein content. The accumulated oAβ seems to co-localize with VPS35 and early endo…

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Metadata

Authors
Ansell-Schultz, A., Reyes, J. F., Samuelsson, M., & Hallbeck, M.
Venue
Molecular and Cellular Neuroscience
Publisher
Elsevier BV
Published
2018-12
Volume
93
Pages
18-26
ISSN
1044-7431
DOI
10.1016/j.mcn.2018.09.003
Cited by
18
References
11
Language
en
Licence
Funders
  • Swedish Research Council (523-2013-2735)
  • Swedish Alzheimer Foundation
  • Swedish Brain Foundation
  • Parkinson Research Foundation
  • Swedish Parkinson Foundation
  • Hans-Gabriel and Alice Trolle-Wachtmeister Foundation
  • Konung Gustaf V:s och Drottning Victorias Frimurarestiftelse
  • Swedish Dementia Foundation
  • Linköping University
  • County Council of Östergötland

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