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ARTICLE

Apolipoprotein E {epsilon}4 Allele, Elevated Midlife Total Cholesterol Level, and High Midlife Systolic Blood Pressure Are Independent Risk Factors for Late-Life Alzheimer Disease

right arrow Miia Kivipelto, MD; Eeva-Liisa Helkala, PhD; Mikko P. Laakso, MD, PhD; Tuomo Hänninen, PhD; Merja Hallikainen, MD, PhD; Kari Alhainen, MD, PhD; Susan Iivonen, MS; Arto Mannermaa, PhD; Jaakko Tuomilehto, MD, PhD; Aulikki Nissinen, MD, PhD; and Hilkka Soininen, MD, PhD

6 August 2002 | Volume 137 Issue 3 | Pages 149-155

Background: Presence of the apolipoprotein E (apoE) {epsilon}4 allele, which is involved in cholesterol metabolism, is the most important genetic risk factor for Alzheimer disease. Elevated midlife values for total cholesterol level and blood pressure have been implicated recently as risk factors for Alzheimer disease.

Objective: To study the relative importance and the putative relationship among the apoE {epsilon}4 allele, midlife total cholesterol level, and midlife blood pressure as risk factors for late-life Alzheimer disease.

Design: Prospective population-based study.

Setting: Kuopio and Joensuu, eastern Finland.

Participants: Participants were derived from random population surveys from 1972, 1977, 1982, and 1987. A total of 1449 persons (73%), 65 to 79 years of age, participated in the reexamination in 1998 (mean follow-up, 21 years).

Measurements: Midlife blood pressure and total cholesterol level, apoE genotype, and development of Alzheimer disease during follow-up.

Results: The apoE {epsilon}4 allele was an independent risk factor for Alzheimer disease, even after adjustment for midlife vascular risk factors and other confounders (odds ratio, 2.1 [95% CI, 1.1 to 4.1]). Similarly, elevated midlife values for serum total cholesterol level (odds ratio, 2.8 [CI, 1.2 to 6.7]) and systolic blood pressure (odds ratio, 2.6 [CI, 1.1 to 6.6]) were independent risk factors for Alzheimer disease, even after adjustment for apoE genotype and other confounding factors.

Conclusions: The association between the apoE {epsilon}4 allele and Alzheimer disease does not seem to be mediated by vascular factors. The apoE {epsilon}4 allele, elevated midlife total cholesterol level, and high midlife systolic blood pressure are independent risk factors for Alzheimer disease. The risk for Alzheimer disease from treatable factors—elevated total cholesterol level and blood pressure—appears to be greater than that from the apoE {epsilon}4 allele.


Editors' Notes
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Context

  • Apolipoprotein E (apoE) {epsilon}4 allele, elevated total cholesterol level, and hypertension are risk factors for late-life Alzheimer disease.
  • Are these risk factors independent, or do the effects of apoE polymorphism on cholesterol metabolism mediate the association between apoE and Alzheimer disease?

Contribution

  • In this long-term, prospective population-based study, apoE, elevated total cholesterol level, and elevated systolic hypertension increased the risk for Alzheimer disease in an independent and additive manner.

Implications

  • The mechanism by which apoE polymorphism contributes to the development of Alzheimer disease appears different than the mechanism that mediates its effect on cholesterol level.
  • Some risk factors for Alzheimer disease (dyslipidemia and systolic hypertension) are potentially treatable, while others (apoE) are not.

–The Editors

 

Author and Article Information
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From University of Kuopio, and Kuopio University Hospital, Kuopio; North Karelia Central Hospital, Joensuu; and the National Public Health Institute, Helsinki, Finland.

Acknowledgments: The authors thank Petra Mäkinen for technical help and Veli Koistinen, Veikko Jokela, and Pirjo Halonen for consultations in statistical analysis.

Grant Support: By the Academy of Finland (grants 37573, 63645, 48138, 48950) and by erityisvaltionosuus (EVO) (grant 477268).

Requests for Single Reprints: Miia Kivipelto, MD, University of Kuopio, Department of Neuroscience and Neurology, PO Box 1627, 70211 Kuopio, Finland; e-mail, miia.kivipelto{at}uku.fi.

Potential Financial Conflicts of Interest: None disclosed.

Current Author Addresses: Drs. Kivipelto and Soininen: University of Kuopio, Department of Neuroscience and Neurology, PO Box 1627, 70211 Kuopio, Finland.

Dr. Helkala: University of Kuopio, Department of Public Health and General Practice, PO Box 1627, 70211 Kuopio, Finland.

Dr. Laakso: Kuopio University Hospital, Departments of Clinical Radiology and Neurology, PO Box 1777, 70211 Kuopio, Finland.

Dr. Hänninen: Kuopio University Hospital, Department of Neurology, PO Box 1777, 70211 Kuopio, Finland.

Dr. Hallikainen: Kuopio University Hospital, Department of Neurology, Building 4, PO Box 1777, 70211 Kuopio, Finland.

Dr. Alhainen: Memory Research Centre, Torikatu 17, 80100 Joensuu, Finland.

Ms. Iivonen: University of Kuopio, Department of Neuroscience and Neurology, PO Box 1627, 70211 Kuopio, Finland.

Dr. Mannermaa: Kuopio University Hospital, Chromosome and DNA Laboratory of the Division of Diagnostic Services, PO Box 1777, 70211 Kuopio, Finland.

Drs. Tuomilehto and Nissinen: National Public Health Institute, Diabetes and Genetic Epidemiology Unit, Mannerheimintie 166, 00300 Helsinki, Finland.

Author Contributions: Conception and design: M. Kivipelto, E.-L. Helkala, J. Tuomilehto, A. Nissinen, H. Soininen.

Analysis and interpretation of the data: M. Kivipelto, E.-L. Helkala, M.P. Laakso, J. Tuomilehto, A. Nissinen, H. Soininen.

Drafting of the article: M. Kivipelto, M.P. Laakso.

Critical revision of the article for important intellectual content: M. Kivipelto, E.-L. Helkala, M.P. Laakso, T. Hänninen, M. Hallikainen, K. Alhainen, S. Iivonen, A. Mannermaa, J. Tuomilehto, A. Nissinen, H. Soininen.

Final approval of the article: M. Kivipelto, E.-L. Helkala, M.P. Laakso, T. Hänninen, M. Hallikainen, K. Alhainen, S. Iivonen, A. Mannermaa, J. Tuomilehto, A. Nissinen, H. Soininen.

Statistical expertise: M. Kivipelto, E.-L. Helkala.

 

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