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August 31, 2010; 75 (9) Articles

Insulin resistance is associated with the pathology of Alzheimer disease

The Hisayama Study

T. Matsuzaki, K. Sasaki, Y. Tanizaki, J. Hata, K. Fujimi, Y. Matsui, A. Sekita, S.O. Suzuki, S. Kanba, Y. Kiyohara, T. Iwaki
First published August 25, 2010, DOI: https://doi.org/10.1212/WNL.0b013e3181eee25f
T. Matsuzaki
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K. Sasaki
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Y. Tanizaki
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J. Hata
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K. Fujimi
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Citation
Insulin resistance is associated with the pathology of Alzheimer disease
The Hisayama Study
T. Matsuzaki, K. Sasaki, Y. Tanizaki, J. Hata, K. Fujimi, Y. Matsui, A. Sekita, S.O. Suzuki, S. Kanba, Y. Kiyohara, T. Iwaki
Neurology Aug 2010, 75 (9) 764-770; DOI: 10.1212/WNL.0b013e3181eee25f

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Abstract

Objective: We examined the association between diabetes-related factors and pathology of Alzheimer disease (AD) to evaluate how diabetes affects the pathogenic process of AD.

Methods: This study included specimens from a series of 135 autopsies of residents of the town of Hisayama in Fukuoka prefecture (74 men and 61 women) performed between 1998 and 2003, who underwent a 75-g oral glucose tolerance test in clinical examinations in 1988. We measured diabetes-related factors including fasting glucose, 2-hour post-load plasma glucose, fasting insulin, and homeostasis model assessment of insulin resistance (HOMA-IR) in 1988. Neuritic plaques (NPs) were assessed according to the Consortium to Establish a Registry for Alzheimer's Disease guidelines and neurofibrillary tangles (NFTs) were assessed according to Braak stage. The associations between each factor and AD pathology were examined by analysis of covariance and logistic regression analyses.

Results: Higher levels of 2-hour post-load plasma glucose, fasting insulin, and HOMA-IR were associated with increased risk for NPs after adjustment for age, sex, systolic blood pressure, total cholesterol, body mass index, habitual smoking, regular exercise, and cerebrovascular disease. However, there were no relationships between diabetes-related factors and NFTs. Regarding the effects of APOE genotype on the risk of AD pathology, the coexistence of hyperglycemia and APOE ε4 increased the risk for NP formation. A similar enhancement was observed for hyperinsulinemia and high HOMA-IR.

Conclusion: The results of this study suggest that hyperinsulinemia and hyperglycemia caused by insulin resistance accelerate NP formation in combination with the effects of APOE ε4.

Footnotes

  • Editorial, page 758

    e-Pub ahead of print on August 25, 2010, at www.neurology.org.

    Study funding: Supported by a Grant-in-Aid for Scientists from the Ministry of Health, Labour and Welfare, Japan (H19-nanchi-ippan-006), a Health and Labour Sciences Research Grant from the Ministry of Health, Labour and Welfare (Comprehensive Research on Aging and Health: H20-Chouju-004), and a Grant-in-Aid for Scientists from the Ministry of Education, Culture, Sports, Science and Technology of Japan (No. 19300125).

    Disclosure: Author disclosures are provided at the end of the article.

    Received October 5, 2009. Accepted in final form February 19, 2010.

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