Cited by 123Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

γ-secretase modulators and presenilin 1 mutants act differently on presenilin/γ-secretase function to cleave Aβ42 and Aβ43

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Okochi, Masayasu, Tagami, Shinji, Yanagida, Kanta, Takami, Mako, Kodama, Takashi S., Mori, Kohji, Nakayama, Taisuke, Ihara, Yasuo +1 more·2013·Cell Reports

Abstract

Deciphering the mechanism by which the relative Aβ42(43) to total Aβ ratio is regulated is central to understanding Alzheimer disease (AD) etiology; however, the mechanisms underlying changes in the Aβ42(43) ratio caused by familial mutations and γ-secretase modulators (GSMs) are unclear. Here, we show in vitro and in living cells that presenilin (PS)/γ-secretase cleaves Aβ42 into Aβ38, and Aβ43 into Aβ40 or Aβ38. Approximately 40% of Aβ38 is derived from Aβ43. Aβ42(43) cleavage is involved in the regulation of the Aβ42(43) ratio in living cells. GSMs increase the cleavage of PS/γ-secretase-bound Aβ42 (increase k(cat)) and slow its dissociation from the enzyme (decrease k(b)), whereas PS1 mutants and inverse GSMs show the opposite effects. Therefore, we suggest a concept to describe the Aβ42(43) production process and propose how GSMs act, and we suggest that a loss of PS/γ-secretase function to cleave Aβ42(43) may initiate AD and might represent a therapeutic target.

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Crossref · 10.1016/j.celrep.2012.11.028

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  • The mechanism of gamma-secretase modulators appears related to slowed dissociation of the epsilon-cleaved C99 fragment, increasing enzyme processivity and generating shorter Aβ fragments.

    “The mechanism appears to be related to slowed dissociation of epsilon-cleaved C99 fragment thereby increasing enzyme processivity, leading to generation of shorter Aβ fragments (Okochi et al., 2013).”

    From Alzheimer Disease: An Update on Pathobiology and Treatment Strategies (2019) · cites this paper as Okochi et al., 2013

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Authors
Okochi, M., Tagami, S., Yanagida, K., Takami, M., Kodama, T. S., Mori, K., Nakayama, T., Ihara, Y., & Takeda, M.
Affiliations
  • The University of Osaka (JP)
  • Doshisha University (JP)
Corresponding author
Okochi, Masayasu
Venue
Cell Reports
Publisher
Elsevier BV
Published
2013-01
Volume
3
Issue
1
Pages
42-51
ISSN
2211-1247 (ISSN-L)
OpenAlex
W2141242388
Cited by
123
References
33
Citations by year
2026: 1 · 2025: 3 · 2024: 10 · 2023: 10 · 2022: 9 · 2021: 6 · 2020: 14 · 2019: 9 · 2018: 5 · 2017: 10 · 2016: 14 · 2015: 6 · 2014: 17 · 2013: 9
FWCI
10.65
Type
journal article
Language
en
Open access
Locations
  • Cell Reports (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institute of Biomedical Innovation (05-26)
  • National Center for Geriatrics and Gerontology
  • Ministry of Education, Culture, Sports, Science and Technology
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
γ-secretase modulators, presenilin 1, amyloid-beta 42, Aβ40, Alzheimer's disease, presenilin 1 mutations, enzyme kinetics, substrate dissociation
MeSH terms
Alzheimer Disease, Amino Acid Sequence, Cell Survival, Humans, Kinetics, Molecular Sequence Data, Peptides, Protein Binding, Substrate Specificity, Amyloid beta-Peptides, Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization, Mutant Proteins, Presenilin-1, Amyloid Precursor Protein Secretases, HEK293 Cells, Proteolysis

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