Cited by 269Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Partial Loss-of-Function Mutations in Insulin-Degrading Enzyme that Induce Diabetes also Impair Degradation of Amyloid β-Protein

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Farris, Wesley, Mansourian, Stefan, Leissring, Malcolm A., Eckman, Elizabeth A., Bertram, Lars, Eckman, Christopher B., Tanzi, Rudolph E., Selkoe, Dennis J.·2004·The American Journal of Pathology

Abstract

The causes of cerebral accumulation of amyloid beta-protein (Abeta) in most cases of Alzheimer's disease (AD) remain unknown. We recently found that homozygous deletion of the insulin-degrading enzyme (IDE) gene in mice results in an early and marked elevation of cerebral Abeta. Both genetic linkage and allelic association in the IDE region of chromosome 10 have been reported in families with late-onset AD. For IDE to remain a valid candidate gene for late-onset AD on functional grounds, it must be shown that partial loss of function of IDE can still alter Abeta degradation, but without causing early, severe elevation of brain Abeta. Here, we show that naturally occurring IDE missense mutations in a well-characterized rat model of type 2 diabetes mellitus (DM2) result in decreased catalytic efficiency and a significant approximately 15 to 30% deficit in the degradation of both insulin and Abeta. Endogenously secreted Abeta(40) and Abeta(42) are significantly elevated in primary neuronal cultures from animals with the IDE mutations, but there is no increase in steady-state levels of rodent Abeta in the brain up to age 14 months. We conclude that naturally occurring, partial loss-of-function mutations in IDE sufficient to cause DM2 also impair neuronal regulation of Abeta levels, but the brain can apparently compensate for the partial deficit during the life span of the rat. Our findings have relevance for the emerging genetic evidence suggesting that IDE may be a late-onset AD-risk gene, and for the epidemiological relationships among hyperinsulinemia, DM2, and AD.

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  1. Qiu WQ, Walsh DM, Ye Z, Vekrellis K, Zhang J, Podlisny M, Rosner MR, Safavi A, Hersh LB, Selkoe DJ: Insulin degrading enzyme regu- lates the level of monomeric amyloid ␤-protein extracellularly via degradation and oligomerization. J Biol Chem 1998, 273:32730 - 32738
  2. McLean CA, Cherny RA, Fraser FW, Fuller SJ, Smith MJ, Beyreuther K, Bush AI, Masters CL: Soluble pool of Abeta amyloid as a determi- nant of severity of neurodegeneration in Alzheimer's disease. Ann Neurol 1999, 46:860 -866
  3. Bertram L, Saunders A, Mullin K, Sampson A, Moscarillo T, Becker D, Velicelebi G, Wanger S, Blacker D, Tanzi R: Further assessment of novel Alzheimer's disease loci on chromosomes 10 and 9. Neurobiol Aging 2002, 23:S324 (Abstract)

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Authors
Farris, W., Mansourian, S., Leissring, M. A., Eckman, E. A., Bertram, L., Eckman, C. B., Tanzi, R. E., & Selkoe, D. J.
Affiliations
  • Brigham and Women's Hospital (US)
  • Mayo Clinic (US)
  • Harvard University (US)
Corresponding author
Selkoe, Dennis J.
Venue
The American Journal of Pathology
Publisher
Elsevier BV
Published
2004-04
Volume
164
Issue
4
Pages
1425-1434
ISSN
0002-9440 (ISSN-L)
OpenAlex
W1988531009
Cited by
269
References
66
Citations by year
2026: 5 · 2025: 9 · 2024: 9 · 2023: 6 · 2022: 15 · 2021: 9 · 2020: 6 · 2019: 3 · 2018: 11 · 2017: 7 · 2016: 7 · 2015: 11 · 2014: 9 · 2013: 12 · 2012: 15
FWCI
15.25
Type
journal article
Language
en
Open access
Locations
  • American Journal Of Pathology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute on Aging (AG12479)
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, amyloid-beta, Alzheimer's disease, type 2 diabetes, missense mutations, amyloid beta degradation, insulin degradation, hyperinsulinemia
MeSH terms
Alzheimer Disease, Animals, Brain, Cells, Cultured, Cricetulus, Diabetes Mellitus, Experimental, Diabetes Mellitus, Type 2, Cricetinae, Humans, Insulin, Insulysin, Neurons, Transfection, Immunoblotting, Amyloid beta-Peptides, CHO Cells, Mutation, Missense, Rats

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