Cited by 1,575Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Mutant presenilins specifically elevate the levels of the 42 residue β-amyloid peptide in vivo: evidence for augmentation of a 42-specific γ secretase

Jankowsky, Joanna L., Fadale, Daniel J., Anderson, Jeffrey, Xu, Guilian M., Gonzales, Victoria, Jenkins, Nancy A., Copeland, Neal G., Lee, Michael K. +4 more·2004·Human Molecular Genetics

Abstract

Amyloid precursor protein (APP) is endoproteolytically processed by BACE1 and gamma-secretase to release amyloid peptides (Abeta40 and 42) that aggregate to form senile plaques in the brains of patients with Alzheimer's disease (AD). The C-terminus of Abeta40/42 is generated by gamma-secretase, whose activity is dependent upon presenilin (PS 1 or 2). Missense mutations in PS1 (and PS2) occur in patients with early-onset familial AD (FAD), and previous studies in transgenic mice and cultured cell models demonstrated that FAD-PS1 variants shift the ratio of Abeta40 : 42 to favor Abeta42. One hypothesis to explain this outcome is that mutant PS alters the specificity of gamma-secretase to favor production of Abeta42 at the expense of Abeta40. To test this hypothesis in vivo, we studied Abeta40 and 42 levels in a series of transgenic mice that co-express the Swedish mutation of APP (APPswe) with two FAD-PS1 variants that differentially accelerate amyloid pathology in the brain. We demonstrate a direct correlation between the concentration of Abeta42 and the rate of amyloid deposition. We further show that the shift in Abeta42 : 40 ratios associated with the expression of FAD-PS1 variants is due to a specific elevation in the steady-state levels of Abeta42, while maintaining a constant level of Abeta40. These data suggest that PS1 variants do not simply alter the preferred cleavage site for gamma-secretase, but rather that they have more complex effects on the regulation of gamma-secretase and its access to substrates.

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Crossref · 10.1093/hmg/ddh019

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  • Dozens of mouse lines overexpressing several combinations of APP and PSEN1 mutations have been created to accelerate the onset of Aβ pathologies in brains.

    “dozens of mouse lines overexpressing several combinations of APP and PSEN1 mutations have been created to accelerate the onset of Aβ pathologies in brains [28–30].”

    From Amyloid-β plaque formation and reactive gliosis are required for induction of cognitive deficits in App knock-in mouse models of Alzheimer’s disease (2019) · cites this paper as [28]

    The Introduction (p. 2) and Figure 2 (p. 4) describe APP-mutant mice co-expressing different PS1 mutations and show that co-expression accelerates brain amyloid deposition. The Generation of transgenic mice section (p. 8) identifies several lines, but this paper does not establish that dozens of such lines have been created. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • WAVE1 knockout dramatically reduces Aβ levels and restores memory deficits in APP/PS1 transgenic mice expressing familial mutations in APP (APPswe) and presenilin 1 (PSEN1 ΔE9).

    “WAVE1 KO dramatically reduces Aβ levels and restores memory deficits in APP/PS1 transgenic mice expressing familial mutations in APP (APPswe) and presenilin 1 (PSEN1 ΔE9)146, suggesting a protective role for reduced WAVE1 expression in AD143.”

    From The WAVE complex in developmental and adulthood brain disorders (2025) · cites this paper as [146]

    Figure 2 (p. 4) identifies APPswe/PS1-ΔE9 transgenic mice, supporting the description of the mouse model. The Discussion (p. 4) reports that mutant PS1 increases Aβ42, but the paper does not report WAVE1 knockout, a WAVE1-related reduction in Aβ, or restoration of memory deficits. (LLM, conf=0.89)

    Experimental — accuracy not yet measured
  • C1q was similarly increased in hippocampus of APP/PS1 mice.

    “C1q was also similarly increased in hippocampus of another model of AD, the APP/PS1 mice (15) (Fig. S2C).”
  • APP/PS1 transgenic mice overexpress a chimeric mouse/human APP695 swedish gene and human PSEN1 with an exon 9 deletion.

    “APP/PS1 transgenic mice overexpress a chimeric mouse/human APP695 swedish gene and human PSEN1 with an exon 9 deletion (Jankowsky et al., 2004).”
  • 9-mo-old APPswe/PS1ΔE9 mice have preexisting fibrillar plaques.

    “Because we used 9-mo-old APPswe/PS1ΔE9 mice with preexisting fibrillar plaques (Jankowsky et al., 2004), we calculated HJ6.3-induced microglial activation after normalizing with fibrillar plaque load.”

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Authors
Jankowsky, J. L., Fadale, D. J., Anderson, J., Xu, G. M., Gonzales, V., Jenkins, N. A., Copeland, N. G., Lee, M. K., Younkin, L. H., Wagner, S. L., Younkin, S. G., & Borchelt, D. R.
Affiliations
  • California Institute of Technology (US)
  • Mayo Clinic (US)
  • Merck & Co., Inc., Rahway, NJ, USA (United States) (US)
  • Johns Hopkins University (US)
  • National Institutes of Health (US)
Corresponding author
Jankowsky, Joanna L.
Venue
Human Molecular Genetics
Published
2003-11-25
Volume
13
Issue
2
Pages
159-170
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2142943752
Cited by
1,575
References
80
Citations by year
2026: 63 · 2025: 99 · 2024: 104 · 2023: 83 · 2022: 115 · 2021: 111 · 2020: 132 · 2019: 96 · 2018: 88 · 2017: 81 · 2016: 91 · 2015: 90 · 2014: 68 · 2013: 69 · 2012: 66
FWCI
8.84
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Funders
  • National Institute on Aging (1 P01 AG-98-003, 1 P50 AG-14-248)
  • National Institute of Neurological Disorders and Stroke (1 T32 NS07435, T32NS007435)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
presenilin 1, presenilin 2, gamma-secretase, amyloid-beta 42, Aβ40, Alzheimer's disease, familial Alzheimer's disease, APPswe, transgenic mice, amyloid deposition
MeSH terms
Alzheimer Disease, Animals, Brain, Cells, Cultured, Humans, Membrane Proteins, Mice, Transgenic, Peptide Fragments, Endopeptidases, Amyloid beta-Peptides, Aspartic Acid Endopeptidases, Age of Onset, Mutation, Missense, Mice, Presenilin-1, Amyloid Precursor Protein Secretases

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