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November 30, 2010; 75 (22) Articles

Insulin metabolism and the risk of Alzheimer disease

The Rotterdam Study

E.M.C. Schrijvers, J.C.M. Witteman, E.J.G. Sijbrands, A. Hofman, P.J. Koudstaal, M.M.B. Breteler
First published November 29, 2010, DOI: https://doi.org/10.1212/WNL.0b013e3181ffe4f6
E.M.C. Schrijvers
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J.C.M. Witteman
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E.J.G. Sijbrands
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A. Hofman
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P.J. Koudstaal
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M.M.B. Breteler
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Citation
Insulin metabolism and the risk of Alzheimer disease
The Rotterdam Study
E.M.C. Schrijvers, J.C.M. Witteman, E.J.G. Sijbrands, A. Hofman, P.J. Koudstaal, M.M.B. Breteler
Neurology Nov 2010, 75 (22) 1982-1987; DOI: 10.1212/WNL.0b013e3181ffe4f6

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Abstract

Objective: Diabetes mellitus has been associated with an increased risk of Alzheimer disease (AD), but how it exerts its effect remains controversial. Possible pathophysiologic mechanisms are glucose toxicity and a direct effect of insulin on amyloid metabolism. Most studies had short follow-up, and longer-term effects of diabetes on AD risk are unknown. We investigated whether fasting glucose and insulin levels and insulin resistance are associated with the risk of AD and whether this risk is constant over time.

Methods: The study was based on 3,139 participants of the Rotterdam Study, a population-based cohort study. All subjects were free from dementia, did not have a history of diabetes, and had fasting levels of glucose and insulin measured at baseline. Insulin resistance was estimated with the homeostasis model assessment. We investigated how fasting glucose, insulin, and insulin resistance are related to the risk of AD in 3 different strata according to time-to-event, using Cox proportional hazards models.

Results: During follow-up, 211 participants developed AD, 71 of them within 3 years of baseline. Levels of insulin and insulin resistance were associated with a higher risk of AD within 3 years of baseline. After 3 years, the risk was no longer increased. Glucose was not associated with a higher risk of AD. There was no interaction of APOE ϵ4 carriership and insulin metabolism on the risk of AD.

Conclusions: Our findings suggest that insulin metabolism influences the clinical manifestation of AD only within 3 years.

Footnotes

  • AD
    Alzheimer disease
    DSM-III-R
    Diagnostic and Statistical Manual of Mental Disorders, 3rd edition, revised
    HDL
    high-density lipoprotein
    HOMA
    homeostasis model assessment.

  • Received June 4, 2010.
  • Accepted August 20, 2010.
  • Copyright © 2010 by AAN Enterprises, Inc.
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