Apolipoprotein E epsilon4 magnifies lifestyle risks for dementia: a population-based study.
Miia Kivipelto1, Suvi Rovio, Tiia Ngandu
1Aging Research Center, NVS, Karolinska Institutet, Stockholm, Sweden. Miia.Kivipelto@ki.se
Journal of Cellular and Molecular Medicine
|March 6, 2008
Summary
The apoE epsilon4 allele increases dementia risk. Lifestyle factors like inactivity and poor diet pose greater risks for apoE epsilon4 carriers, suggesting targeted interventions can reduce dementia incidence.
Area of Science:
- Neuroscience
- Genetics
- Epidemiology
Background:
- Dementia and Alzheimer's disease (AD) risk is influenced by genetic and environmental interactions.
- The apolipoprotein E (apoE) epsilon4 allele is a known genetic risk factor for AD.
- Understanding gene-environment interactions is crucial for dementia prevention strategies.
Purpose of the Study:
- To investigate the interaction between the apoE epsilon4 allele and lifestyle risk factors for dementia and AD.
- To determine if specific lifestyle choices exacerbate dementia risk in apoE epsilon4 carriers.
Main Methods:
- Utilized data from the Cardiovascular Risk Factors, Aging, and Dementia (CAIDE) study.
- Followed 1449 individuals aged 65-79 for an average of 21 years.
- Analyzed the association between apoE genotype, lifestyle factors (physical activity, alcohol, smoking, diet), and dementia/AD risk.
Main Results:
- The apoE epsilon4 allele was an independent risk factor for dementia/AD (OR=2.83).
- Physical inactivity, alcohol consumption, and smoking significantly increased dementia/AD risk, especially in apoE epsilon4 carriers.
- Dietary fat intake (low polyunsaturated, high saturated) also showed a more pronounced risk increase in apoE epsilon4 carriers.
- A composite lifestyle score indicated a substantially higher risk in the highest quartile among epsilon4 carriers (OR=11.42).
Conclusions:
- Midlife lifestyle factors like physical inactivity, diet, alcohol, and smoking are associated with increased dementia/AD risk.
- Individuals carrying the apoE epsilon4 allele appear more vulnerable to these environmental/lifestyle risk factors.
- Lifestyle interventions may be particularly effective in modifying dementia risk for genetically susceptible individuals.
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