Abstract | AIMS: METHODS: We used immunogold electron microscopy to determine the localization and pathology of Aβ accumulation in groups of transgenic mice expressing anchored or unanchored forms of Aβ or mutated human Alzheimer's precursor protein. RESULTS: GPI attached Aβ did not replicate the membrane lesions of PrP(d). However, as with PrP(d) in prion disease, Aβ peptides derived from each transgenic mouse line initially accumulated on morphologically normal neurite membranes, elicited rapid glial recognition and neurite Aβ was transferred to attenuated microglial and astrocytic processes. CONCLUSIONS: GPI attachment of misfolded membrane proteins is insufficient to cause prion-like membrane lesions. Prion disease and murine Aβ amyloidosis both accumulate misfolded monomeric or oligomeric membrane proteins that are recognized by glial processes and acquire such misfolded proteins prior to their accumulation in the extracellular space. In contrast to prion disease where glial cells efficiently endocytose PrP(d) to endolysosomes, activated microglial cells in murine Aβ amyloidosis are not as efficient phagocytes.
|
Authors | Martin Jeffrey, Gillian McGovern, Rona Barron, Frank Baumann |
Journal | Neuropathology and applied neurobiology
(Neuropathol Appl Neurobiol)
Vol. 41
Issue 4
Pg. 458-70
(Jun 2015)
ISSN: 1365-2990 [Electronic] England |
PMID | 25131655
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
|
Copyright | © 2014 British Neuropathological Society. |
Chemical References |
- APP protein, human
- Amyloid beta-Peptides
- Amyloid beta-Protein Precursor
- Peptide Fragments
- amyloid beta-protein (1-40)
- amyloid beta-protein (1-42)
|
Topics |
- Amyloid beta-Peptides
(metabolism)
- Amyloid beta-Protein Precursor
(genetics, metabolism)
- Animals
- Brain
(metabolism, ultrastructure)
- Cell Membrane
(metabolism, ultrastructure)
- Humans
- Mice
- Mice, Transgenic
- Microglia
(metabolism, ultrastructure)
- Mutation
- Neurites
(metabolism, ultrastructure)
- Peptide Fragments
(metabolism)
|