Cited by 129Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

Apolipoprotein E and Low Density Lipoprotein Receptor-related Protein Facilitate Intraneuronal Aβ42 Accumulation in Amyloid Model Mice

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Zerbinatti, Celina V., Wahrle, Suzanne E., Kim, Hyungjin, Cam, Judy A., Bales, Kelly, Paul, Steven M., Holtzman, David M., Bu, Guojun·2006·Journal of Biological Chemistry

Abstract

The low density lipoprotein receptor-related protein (LRP) is highly expressed in the brain and has been shown to alter the metabolism of amyloid precursor protein and amyloid-beta peptide (Abeta) in vitro. Previously we developed mice that overexpress a functional LRP minireceptor (mLRP2) in their brains and crossed them to the PDAPP mouse model of Alzheimer disease. Overexpression of mLRP2 in 22-month-old PDAPP mice with amyloid plaques increased a pool of carbonate-soluble Abeta in the brain and worsened memory-related behavior. In the current study, we examined the effects of mLRP2 overexpression on 3-month-old PDAPP mice that had not yet developed amyloid plaques. We found significantly higher levels of membrane-associated Abeta42 in the hippocampus of mice that overexpressed mLRP2. Using immunohistochemical methods, we observed significant intraneuronal Abeta42 in the hippocampus and frontal cortex of PDAPP mice, which frequently co-localized with the lysosomal marker LAMP-1. Interestingly, PDAPP mice lacking apolipoprotein E (apoE) had much less intraneuronal Abeta42. We also found that PC12 cells overexpressing mLRP2 cleared Abeta42 and Abeta40 more rapidly from media than PC12 cells transfected with the vector only. Preincubation of apoE3 or apoE4 with Abeta42 increased the rate of Abeta clearance, and this effect was partially blocked by receptor-associated protein. Our results support the hypothesis that LRP binds and endocytoses Abeta42 both directly and via apoE…

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Crossref · 10.1074/jbc.m604436200

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Authors
Zerbinatti, C. V., Wahrle, S. E., Kim, H., Cam, J. A., Bales, K., Paul, S. M., Holtzman, D. M., & Bu, G.
Affiliations
  • Washington University in St. Louis (US)
  • Eli Lilly (United States) (US)
Corresponding author
Bu, Guojun
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2006-11
Volume
281
Issue
47
Pages
36180-36186
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2041371648
Cited by
129
References
48
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2023: 1 · 2022: 2 · 2021: 2 · 2020: 3 · 2019: 1 · 2018: 4 · 2017: 6 · 2016: 11 · 2015: 4 · 2014: 11 · 2013: 9 · 2012: 7
FWCI
7.75
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
Funders
  • National Institute on Aging (R01AG027924)
  • National Institute of Neurological Disorders and Stroke (F32-NS41872, F32NS041872)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
apolipoprotein E, low density lipoprotein receptor-related protein, amyloid-beta 42, amyloid plaques, PDAPP mice, Alzheimer's disease, amyloid clearance, lysosomes, LAMP1, receptor-associated protein, APOE3, APOE ε4, hippocampus, frontal cortex, memory impairment
MeSH terms
Animals, Apolipoproteins E, Brain, Endocytosis, Hippocampus, Humans, Immunohistochemistry, Lysosomes, Mice, Transgenic, Neurons, Peptide Fragments, Amyloid beta-Peptides, PC12 Cells, Low Density Lipoprotein Receptor-Related Protein-1, Mice, Rats

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