Journal
NEUROBIOLOGY OF AGING
Volume 32, Issue 10, Pages 1756-1764Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.neurobiolaging.2009.11.006
Keywords
Aging; Basal forebrain; Cholinergic; Dementia; Imaging; Memory
Categories
Funding
- National Institute on Aging, National Institutes of Health [P01 AG09466, P01 AG14449, P30 AG10161, R01 AG17917, R01 AG10688]
- Illinois Department of Public Health
- National Institute on Aging [T32 AG00269]
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The substantia innominata (SI) contains the nucleus basalis of Meynert, which provides the major cholinergic innervation to the entire cortical mantel and the amygdala; degeneration of nucleus basalis neurons correlates with cognitive decline in Alzheimer's disease (AD). However, whether SI atrophy occurs in individuals with amnestic mild cognitive impairment (aMCI) has not been examined thoroughly in vivo. In the present study, we developed a new protocol to measure volumetric changes in the SI from magnetic resonance imaging (MRI) scans. Participants consisted of 27 elderly controls with no cognitive impairment (NCI); 33 individuals with aMCI; and 19 patients with mild AD. SI volumes were traced on three consecutive gapless 1 mm thick coronal slices. Results showed that SI volume was significantly reduced in the mild AD group compared to both NCI and aMCI participants; however, the NCI and aMCI groups did not differ from each other. Furthermore, a decrease in SI volume was related to impaired performance on declarative memory tasks even when attention was controlled. (C) 2009 Elsevier Inc. All rights reserved.
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