Posterior cingulate glucose metabolism, hippocampal glucose metabolism, and hippocampal volume in cognitively normal, late-middle-aged persons at 3 levels of genetic risk for alzheimer disease Academic Article uri icon

Overview

MeSH Major

  • Alzheimer Disease
  • Amyloid
  • Brain
  • Cognition Disorders
  • Positron-Emission Tomography

abstract

  • Objective: To characterize and compare measurements of the posterior cingulate glucose metabolism, the hippocampal glucose metabolism, and hippocampal volume so as to distinguish cognitively normal, late-middleaged persons with 2, 1, or 0 copies of the apolipoprotein E (APOE) e4 allele, reflecting 3 levels of risk for lateonset Alzheimer disease. Design: Cross-sectional comparison of measurements of cerebral glucose metabolism using 18F-fluorodeoxyglucose positron emission tomography and measurements of brain volume using magnetic resonance imaging in cognitively normal e4 homozygotes, e4 heterozygotes, and noncarriers. Setting: Academic medical center. Participants: A total of 31 e4 homozygotes, 42 e4 heterozygotes, and 76 noncarriers, 49 to 67 years old, matched for sex, age, and educational level. Main Outcome Measures: The measurements of posterior cingulate and hippocampal glucose metabolism were characterized using automated region-of-interest algorithms and normalized for whole-brain measurements. The hippocampal volume measurements were characterized using a semiautomated algorithm and normalized for total intracranial volume. Results: Although there were no significant differences among the 3 groups of participants in their clinical ratings, neuropsychological test scores, hippocampal volumes (P=.60), or hippocampal glucose metabolism measurements (P = .12), there were significant group differences in their posterior cingulate glucose metabolism measurements (P=.001). The APOE e4 gene dose was significantly associated with posterior cingulate glucose metabolism (r=0.29, P=.0003), and this association was significantly greater than those with hippocampal volume or hippocampal glucose metabolism (P<.05, determined by use of pairwise Fisher z tests). Conclusions: Although our findings may depend in part on the analysis algorithms used, they suggest that a reduction in posterior cingulate glucose metabolism precedes a reduction in hippocampal volume or metabolism in cognitively normal persons at increased genetic risk for Alzheimer disease. © 2013 American Medical Association. All rights reserved.

publication date

  • January 2013

Research

keywords

  • Academic Article

Identity

Digital Object Identifier (DOI)

  • 10.1001/2013.jamaneurol.286

Additional Document Info

start page

  • 320

end page

  • 325

volume

  • 70

number

  • 3