Cited by 103Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Additive Effects of PS1 and APP Mutations on Secretion of the 42-Residue Amyloid β-Protein

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Citron, Martin, Eckman, Christopher B., Diehl, Thekla S., Corcoran, Chris, Ostaszewski, Beth L., Xia, Weiming, Levesque, Georges, St. George Hyslop, Peter +2 more·1998·Neurobiology of Disease

Abstract

Humans harboring missense mutations in the presenilin 1 (PS1) gene undergo progressive cerebral deposition of the 42-residue amyloid beta-protein (A beta 42) at an early age and develop severe Alzheimer's disease. A beta 42 is selectively elevated in the conditioned media of cells expressing mutant but not wild-type PS1, indicating that presenilin mutations alter APP processing. Here we analyze the effects of various PS1 mutant constructs on the cellular production of A beta 42. A construct expressing only the PS1 N-terminal endoproteolytic fragment with the mutation Y115H causes no significant increase in A beta 42, whereas a full-length PS1 construct with the same mutation does. This result suggests that the pathogenic effect of mutant presenilins is produced by the full-length molecule even though only a minor proportion of total PS1 occurs as holoprotein in tissues and cell lines. We demonstrate that the effects of two different PS1 mutations are additive when engineered into the same PS1 molecule. Therefore, two mutations alter gamma-secretase processing of APP more than one and the PS1 mutations described to date do not cause the maximum possible PS1-mediated rise in A beta 42. When a PS1 mutation was expressed in cells carrying the APPV717I mutation, A beta 42 rose dramatically to become the predominant secreted A beta species, an observation of interest for transgenic modeling of AD. Our results are consistent with the hypothesis that presenilin is a major regulator of the proteolytic processing of APP by gamma-secretases.

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Crossref · 10.1006/nbdi.1998.0183

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Authors
Citron, M., Eckman, C. B., Diehl, T. S., Corcoran, C., Ostaszewski, B. L., Xia, W., Levesque, G., St. George Hyslop, P., Younkin, S. G., & Selkoe, D. J.
Affiliations
  • Amgen (United States) (US)
  • Mayo Clinic (US)
  • Harvard University (US)
Venue
Neurobiology of Disease
Publisher
Elsevier BV
Published
1998-08
Volume
5
Issue
2
Pages
107-116
ISSN
0969-9961 (ISSN-L)
OpenAlex
W2012968591
Cited by
101
References
28
Citations by year
2026: 3 · 2024: 1 · 2023: 1 · 2022: 3 · 2021: 1 · 2020: 3 · 2019: 5 · 2018: 4 · 2017: 3 · 2016: 2 · 2015: 4 · 2014: 1 · 2013: 3 · 2012: 2
FWCI
5.67
Type
journal article
Language
en
Open access
Locations
  • Neurobiology of Disease (publishedVersion)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institutes of Health
  • National Institute on Aging (AG 12749, AG-06173, R01AG012749)
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, APP mutations, amyloid-beta 42, gamma-secretase, APP processing, Alzheimer's disease, conditioned medium, transgenic mouse model
MeSH terms
Alzheimer Disease, Cell Line, Gene Expression Regulation, Humans, Leucine, Membrane Proteins, Methionine, Peptide Fragments, Valine, Amyloid beta-Peptides, Mutagenesis, Site-Directed, Amyloid beta-Protein Precursor, Age of Onset, Amino Acid Substitution, Presenilin-1

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