期刊
NEUROBIOLOGY OF AGING
卷 36, 期 1, 页码 53-59出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.neurobiolaging.2014.07.030
关键词
Mild cognitive impairment; Alzheimer; Dementia; Magnetic resonance spectroscopy; MRS; GABA; Glx; Glutamate; Beta-amyloid; PiB; Posterior cingulate cortex; APOE
资金
- Swiss National Science Foundation [33CM30_124111, 33CM30_140335, 320030_125378]
- National Institutes of Health [R01 EB016089]
- NATIONAL INSTITUTE OF BIOMEDICAL IMAGING AND BIOENGINEERING [P41EB015909, R01EB016089] Funding Source: NIH RePORTER
The biomarker potential of the inhibitory neurotransmitter gamma-aminobutyric acid (GABA) for the in vivo characterization of preclinical stages in Alzheimer's disease has not yet been explored. We measured GABA, glutamate + glutamine (Glx), and N-acetyl-aspartate (NAA) levels by single-voxel MEGA-PRESS magnetic resonance spectroscopy in the posterior cingulate cortex of 21 elderly subjects and 15 patients with amnestic mild cognitive impairment. Participants underwent Pittsburgh Compound B positron emission tomography, apolipoprotein E (APOE) genotyping, and neuropsychological examination. GABA, Glx, and NAA levels were significantly lower in patients. NAA was lower in Pittsburgh Compound B-positive subjects and APOE epsilon 4 allele carriers. GABA, Glx, and NAA levels were positively correlated to CERAD word learning scores. Reductions in GABA, Glx, and NAA levels may serve as metabolic bio-markers for cognitive impairment in amnestic mild cognitive impairment. Because GABA and Glx do not seem to reflect amyloid beta deposition or APOE genotype, they are less likely biomarker candidates for preclinical Alzheimer's disease. (C) 2015 Elsevier Inc. All rights reserved.
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