Multimodal characterization of older APOE2 carriers reveals selective reduction of amyloid load.

Abstract:

OBJECTIVE:To comprehensively assess neurobiological effects of the protective APOE2 allele in the aged brain using a cross-sectional multimodal neuroimaging approach. METHODS:Multimodal neuroimaging data were obtained from a total of 572 older individuals without dementia (cognitively normal and mild cognitive impairment) enrolled in the Alzheimer's Disease Neuroimaging Initiative and included assessments of regional amyloid load with AV45-PET, glucose metabolism with fluorodeoxyglucose-PET, and gray matter volume with structural MRI. Imaging indexes of APOE2 carriers were contrasted to risk-neutral APOE3 homozygotes, and analyses were controlled for age, sex, education, and clinical diagnosis. Additional models examined genotype-specific effects of age on the imaging markers. RESULTS:In region-of-interest-based analyses, APOE2 carriers had significantly less precuneal amyloid pathology and did not show the typical age-related increase in amyloid load, although the age × genotype interaction was only trend-level significant. In contrast, parietal metabolism and hippocampal volume did not differ between APOE2 and APOE3 genotypes, and both groups showed comparable negative effects of age on these markers. The amyloid specificity of APOE2-related brain changes was corroborated in 2 complementary analyses: spatially unbiased voxel-wise analyses showing widespread reductions in amyloid deposition but no differences in gray matter volume or metabolism and an analysis of CSF-based biomarkers showing a significant effect on amyloid but not on tau pathology. CONCLUSIONS:Regarding the range of Alzheimer disease biomarkers considered in the present study, the APOE2 allele appears to have a relatively selective effect on reduced accumulation of amyloid pathology in the aged brain.

journal_name

Neurology

journal_title

Neurology

authors

Grothe MJ,Villeneuve S,Dyrba M,Bartrés-Faz D,Wirth M,Alzheimer's Disease Neuroimaging Initiative.

doi

10.1212/WNL.0000000000003585

subject

Has Abstract

pub_date

2017-02-07 00:00:00

pages

569-576

issue

6

eissn

0028-3878

issn

1526-632X

pii

WNL.0000000000003585

journal_volume

88

pub_type

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