Regulatory feedback cycle of the insulin-degrading enzyme and the amyloid precursor protein intracellular domain: implications for Alzheimer’s disease
Open accessAbstract
One of the major pathological hallmarks of Alzheimer´s disease (AD) is an accumulation of amyloid‐β (Aβ) in brain tissue leading to formation of toxic oligomers and senile plaques. Under physiological conditions, a tightly balanced equilibrium between Aβ‐production and ‐degradation is necessary to prevent pathological Aβ‐accumulation. Here, we investigate the molecular mechanism how insulin‐degrading enzyme (IDE), one of the major Aβ‐degrading enzymes, is regulated and how amyloid precursor protein (APP) processing and Aβ‐degradation is linked in a regulatory cycle to achieve this balance. In absence of Aβ‐production caused by APP or Presenilin deficiency, IDE‐mediated Aβ‐degradation was decreased, accompanied by a decreased IDE activity, protein level, and expression. Similar results were obtained in cells only expressing a truncated APP, lacking the APP intracellular domain (AICD) suggesting that AICD promotes IDE expression. In return, APP overexpression mediated an increased IDE expression, comparable results were obtained with cells overexpressing C50, a truncated APP representing AICD. Beside these genetic approaches, also AICD peptide incubation and pharmacological inhibition of the γ‐secretase preventing AICD production regulated IDE expression and promoter activity. By utilizing CRISPR/Cas9 APP and Presenilin knockout SH‐SY5Y cells results were confirmed in a second cell line in addition to mouse embryonic fibroblasts. In vivo, IDE expression was decreased in mouse brains devoid of APP or AICD, which was in line with a significant correlation of APP expression level and IDE expression in human postmortem AD brains. Our results show a tight link between Aβ‐production and Aβ‐degradation forming a regulatory cycle in which AICD promotes Aβ‐degradation via IDE and IDE itself limits its own production by degrading AICD.
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SGK1 may promote expression or activity of ADAM10 and IDE, enhancing APP metabolism through the non-amyloidogenic pathway and increasing Aβ degradation.
“This finding suggests SGK1 may promote the expression or activity of ADAM10 and IDE, thereby enhancing the metabolism of APP through the non-amyloidogenic β pathway and increasing the degradation of Aβ”
From Serum/glucocorticoid regulated kinase 1 (SGK1) in neurological disorders: pain or gain (2024) · cites this paper as Lauer et al., 2020
The Abstract and Discussion report that APP intracellular domain (AICD) promotes IDE expression and IDE-mediated Aβ degradation. They do not identify SGK1 or ADAM10 as drivers of those effects. The Introduction also describes non-amyloidogenic APP processing as an α- and γ-secretase pathway, not the β pathway printed in the citing sentence. (LLM, conf=0.88)
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Normality Tests for Statistical Analysis: A Guide for Non-Statisticians
Ghasemi, A., & Zahediasl, S. (2012) · International Journal of Endocrinology and Metabolism · doi:10.5812/ijem.3505 · Cited by 4,368 · cited 1× · see citing works
“For the statistical analysis of the human brain samples, we assumed that the data were normally distributed, since the sample size was over 200 (Ghasemi & Zahediasl, 2012).”
Proteolytic Degradation of Amyloid -Protein
Saido, T., & Leissring, M. A. (2012) · Cold Spring Harbor Perspectives in Medicine · doi:10.1101/cshperspect.a006379 · Cited by 368 · see citing works
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Serum/glucocorticoid regulated kinase 1 (SGK1) in neurological disorders: pain or gain
Howard, P. G., Zou, P., Zhang, Y., Huang, F., Tesic, V., Wu, C. Y.-C., & Lee, R. H.-C. (2024) · Experimental Neurology · doi:10.1016/j.expneurol.2024.114973 · Cited by 13 · see citing works
- Authors
- Lauer, A. A., Mett, J., Janitschke, D., Thiel, A., Stahlmann, C. P., Bachmann, C. M., Ritzmann, F., Schrul, B., Müller, U. C., Stein, R., Riemenschneider, M., Grimm, H. S., Hartmann, T., & Grimm, M. O. W.
- Affiliations
- Saarland University (DE)
- Universitätsklinikum des Saarlandes (DE)
- Heidelberg University (DE)
- Tel Aviv University (IL)
- Department of Psychiatry and Psychotherapy Saarland University Hospital Homburg/Saar Germany
- Corresponding author
- Grimm, Marcus O. W.
- ORCID
- Venue
- Aging Cell
- Publisher
- Wiley
- Published
- 2020-10-31
- Volume
- 19
- Issue
- 11
- Pages
- e13264-e13264
- ISSN
- 1474-9718 (ISSN-L)
- 1474-9726
- PMC
- PMC7681056
- OpenAlex
- W3097457964
- Cited by
- 15
- References
- 2
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 3 · 2023: 5 · 2022: 1 · 2021: 2
- FWCI
- 1.20
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Aging Cell (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Publications of the UdS (Saarland University) (cc-by)
- Funders
- EU Joint Programme – Neurodegenerative Disease Research
- European Commission (211696)
- 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
- insulin-degrading enzyme, Alzheimer's disease, amyloid beta degradation, amyloid-beta production, APP processing, presenilin, gamma-secretase inhibition, amyloid-beta deposition, amyloid plaques
- MeSH terms
- Alzheimer Disease, Humans, Insulysin, Signal Transduction, Amyloid beta-Protein Precursor
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