Cited by 198Alzheimer's disease research and treatmentsCellular transport and secretionNeuroinflammation and Neurodegeneration Mechanisms

The cytoplasmic domain of the LDL receptor-related protein regulates multiple steps in APP processing

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Pietrzik, Claus U., Busse, Tracy, Merriam, David E., Weggen, Sascha, Koo, Edward H.·2002·The EMBO Journal

Abstract

The low-density lipoprotein receptor-related protein (LRP) has recently been implicated in numerous intracellular signaling functions, as well as in Alzheimer's disease pathogenesis. Studies have shown that the beta-amyloid precursor protein (APP) interacts with LRP and that this association may impact the production of amyloid beta-protein (Abeta). In this report, we provide evidence that LRP regulates trafficking of intracellular proteins independently of its lipoprotein receptor functions. We show that in the absence of LRP, Abeta production, APP secretion, APP internalization, turnover of full-length APP and stability of APP C-terminal fragments are affected. Importantly, these changes are not APP isoform dependent. Using deletion constructs, the critical region in LRP that modulates APP processing was mapped to a seven peptide domain around the second NPXY domain (residues 4504-4510). Therefore, we propose a model by which LRP functionally modulates APP processing, including those steps critical for Abeta production, through interactions of the cytosolic domains.

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Crossref · 10.1093/emboj/cdf568

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  • Unlike LDLR, LRP1 is an APP binding protein that influences APP endocytic trafficking and cellular distribution such that processing to Aβ and its extracellular release is enhanced.

    “For example, unlike LDLR, LRP1 is an APP binding protein that influences APP endocytic trafficking and cellular distribution such that processing to Aβ and its extracellular release is enhanced (Pietrzik et al., 2002; Ulery et al., 2000).”

    From Overexpression of Low-Density Lipoprotein Receptor in the Brain Markedly Inhibits Amyloid Deposition and Increases Extracellular Aβ Clearance (2009) · cites this paper as Pietrzik et al., 2002

    The Discussion (page not specified) reports that LRP affects APP internalization, trafficking, and the generation and release of Aβ; Aβ levels were markedly lower without LRP. It also describes an APP–LRP association, but says that it is probably not direct binding. The passages do not establish the claimed contrast with LDLR. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • LRP1 is known to increase production of Aβ peptide.

    “Since LRP1 is known to increase the production of Aβ peptide (Ulery et al., 2000; Pietrzik et al., 2002), LRP1-deficient cell lines were chosen to eliminate any possible contribution of LRP1 to this process.”

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Authors
Pietrzik, C. U., Busse, T., Merriam, D. E., Weggen, S., & Koo, E. H.
Affiliations
University of California San Diego (US)
Corresponding author
Koo, Edward H.
Venue
The EMBO Journal
Published
2002-11-01
Volume
21
Issue
21
Pages
5691-5700
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W2069323313
Cited by
198
References
46
Citations by year
2026: 3 · 2025: 2 · 2024: 3 · 2023: 4 · 2022: 4 · 2021: 7 · 2020: 5 · 2019: 3 · 2018: 4 · 2017: 9 · 2016: 4 · 2015: 4 · 2014: 4 · 2013: 9 · 2012: 14
FWCI
8.21
Type
journal article
Language
en
Open access
Locations
  • The EMBO Journal (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Health Assistance Foundation
  • National Institutes of Health
  • National Institute on Aging (AG 12376, R01AG012376)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
low density lipoprotein receptor-related protein, APP processing, amyloid precursor protein, amyloid-beta production, APP secretion, APP C-terminal fragments, NPXY motif, cytoplasmic domain, Alzheimer's disease, protein trafficking
MeSH terms
Animals, Cell Line, Cytoplasm, Enzyme-Linked Immunosorbent Assay, Fibroblasts, Precipitin Tests, Protein Processing, Post-Translational, Blotting, Western, Amyloid beta-Protein Precursor, DNA, Complementary, Low Density Lipoprotein Receptor-Related Protein-1, Mice

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