How can elderly apolipoprotein E ε4 carriers remain free from dementia?

Abstract:

:Apolipoprotein E (APOE) ε4 is a major risk factor for Alzheimer's disease (AD) and dementia, but not all ε4 carriers develop dementia. We sought to identify factors that may play a role in modifying the risk of dementia due to ε4. A cognitively intact cohort (n = 932, age ≥ 75) was followed for 9 years to detect incident dementia cases. At baseline, information on education, leisure activities, and vascular risk factors was collected, and APOE was genotyped. During the follow-up, 324 subjects developed dementia, including 247 AD cases. The hazard ratio (HR, 95% confidence interval [95% CI]) of dementia related to the ε4 was 1.39 (1.11-1.76), while the risk was reduced when ε4 carriers had high education, no vascular risk factors, or high score of leisure activities. Among ε4 carriers, the multiadjusted HRs of dementia that were associated with high education, high level of leisure activities, and absence of vascular risk factors were 0.59 (0.40-0.87), 0.49 (0.29-0.85), and 0.61 (0.41-0.90), respectively. The ε4 carriers with these factors had about 1.2 years delayed time to dementia onset compared with those without these factors. High education, active leisure activities, or maintaining vascular health seems to reduce the risk of dementia related to APOE ε4. The ε4 carriers with these characteristics appear to have similar dementia-free survival time to non-ε4 carriers.

journal_name

Neurobiol Aging

journal_title

Neurobiology of aging

authors

Ferrari C,Xu WL,Wang HX,Winblad B,Sorbi S,Qiu C,Fratiglioni L

doi

10.1016/j.neurobiolaging.2012.03.003

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

13-21

issue

1

eissn

0197-4580

issn

1558-1497

pii

S0197-4580(12)00195-9

journal_volume

34

pub_type

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