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Published in: Acta Neuropathologica Communications 1/2023

Open Access 01-12-2023 | Alzheimer's Disease | Research

ApoER2-Dab1 disruption as the origin of pTau-associated neurodegeneration in sporadic Alzheimer’s disease

Authors: Christopher E. Ramsden, Daisy Zamora, Mark S. Horowitz, Jahandar Jahanipour, Elizabeth Calzada, Xiufeng Li, Gregory S. Keyes, Helen C. Murray, Maurice A. Curtis, Richard M. Faull, Andrea Sedlock, Dragan Maric

Published in: Acta Neuropathologica Communications | Issue 1/2023

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Abstract

In sporadic Alzheimer’s disease (sAD) specific regions, layers and neurons accumulate hyperphosphorylated Tau (pTau) and degenerate early while others remain unaffected even in advanced disease. ApoER2-Dab1 signaling suppresses Tau phosphorylation as part of a four-arm pathway that regulates lipoprotein internalization and the integrity of actin, microtubules, and synapses; however, the role of this pathway in sAD pathogenesis is not fully understood. We previously showed that multiple ApoER2-Dab1 pathway components including ApoE, Reelin, ApoER2, Dab1, pP85αTyr607, pLIMK1Thr508, pTauSer202/Thr205 and pPSD95Thr19 accumulate together within entorhinal-hippocampal terminal zones in sAD, and proposed a unifying hypothesis wherein disruption of this pathway underlies multiple aspects of sAD pathogenesis. However, it is not yet known whether ApoER2-Dab1 disruption can help explain the origin(s) and early progression of pTau pathology in sAD. In the present study, we applied in situ hybridization and immunohistochemistry (IHC) to characterize ApoER2 expression and accumulation of ApoER2-Dab1 pathway components in five regions known to develop early pTau pathology in 64 rapidly autopsied cases spanning the clinicopathological spectrum of sAD. We found that (1) these selectively vulnerable neuron populations strongly express ApoER2; and (2) multiple ApoER2-Dab1 components representing all four arms of this pathway accumulate in abnormal neurons and neuritic plaques in mild cognitive impairment (MCI) and sAD cases and correlate with histological progression and cognitive deficits. Multiplex-IHC revealed that Dab1, pP85αTyr607, pLIMK1Thr508, pTauSer202/Thr205 and pPSD95Thr19 accumulate together within many of the same ApoER2-expressing neurons and in the immediate vicinity of ApoE/ApoJ-enriched extracellular plaques. Collective findings reveal that pTau is only one of many ApoER2-Dab1 pathway components that accumulate in multiple neuroanatomical sites in the earliest stages of sAD and provide support for the concept that ApoER2-Dab1 disruption drives pTau-associated neurodegeneration in human sAD.
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Metadata
Title
ApoER2-Dab1 disruption as the origin of pTau-associated neurodegeneration in sporadic Alzheimer’s disease
Authors
Christopher E. Ramsden
Daisy Zamora
Mark S. Horowitz
Jahandar Jahanipour
Elizabeth Calzada
Xiufeng Li
Gregory S. Keyes
Helen C. Murray
Maurice A. Curtis
Richard M. Faull
Andrea Sedlock
Dragan Maric
Publication date
01-12-2023
Publisher
BioMed Central
Published in
Acta Neuropathologica Communications / Issue 1/2023
Electronic ISSN: 2051-5960
DOI
https://doi.org/10.1186/s40478-023-01693-9

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