Selective reduction of N-acetylaspartate in medial temporal and parietal lobes in AD.

Abstract:

BACKGROUND:Both AD and normal aging cause brain atrophy, limiting the ability of MRI to distinguish between AD and age-related brain tissue loss. MRS imaging (MRSI) measures the neuronal marker N-acetylaspartate (NAA), which could help assess brain change in AD and aging. OBJECTIVES:To determine the effects of AD on concentrations of NAA, and choline- and creatine-containing compounds in different brain regions and to assess the extent NAA in combination with volume measurements by MRI improves discrimination between AD patients and cognitively normal subjects. METHODS:Fifty-six patients with AD (mean age: 75.6 +/- 8.0 years) and 54 cognitively normal subjects (mean age: 74.3 +/- 8.1 years) were studied using MRSI and MRI. RESULTS:NAA concentration was less in patients with AD compared with healthy subjects by 21% (p < 0.0001) in the medial temporal lobe and by 13% to 18% (p < 0.003) in parietal lobe gray matter (GM), but was not changed significantly in white matter and frontal lobe GM. In addition to lower NAA, AD patients had 29% smaller hippocampi and 11% less cortical GM than healthy subjects. Classification of AD and healthy subjects increased significantly from 89% accuracy using hippocampal volume alone to 95% accuracy using hippocampal volume and NAA together. CONCLUSION:In addition to brain atrophy, NAA reductions occur in regions that are predominantly impacted by AD pathology.

journal_name

Neurology

journal_title

Neurology

authors

Schuff N,Capizzano AA,Du AT,Amend DL,O'Neill J,Norman D,Kramer J,Jagust W,Miller B,Wolkowitz OM,Yaffe K,Weiner MW

doi

10.1212/wnl.58.6.928

subject

Has Abstract

pub_date

2002-03-26 00:00:00

pages

928-35

issue

6

eissn

0028-3878

issn

1526-632X

journal_volume

58

pub_type

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