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High amyloid-β deposition related to depressive symptoms in older individuals with normal cognition: a pilot study.

Abstract：

OBJECTIVE:Previous studies have reported depressive symptoms in the preclinical stages of Alzheimer's disease (AD). The objective of this study was to determine whether depressive symptoms are associated with cortical amyloid burden. In order to do this, we measured cortical amyloid via (11) C-labeled Pittsburgh Compound B ([(11) C]PIB) uptake using positron emission tomography (PET) in cognitively normal subjects. METHODS:We performed [(11) C]PIB-PET in 29 cognitively normal, older participants. Depressive symptoms were assessed using the 15-item Geriatric Depression Scale (GDS). Aβ deposition was quantified by binding potential (BPND ), and the association between cortical mean BPND values and GDS scores was evaluated. Analysis of parametric BPND images was performed to examine the relationship between regional BPND and GDS scores. RESULTS:We found a positive correlation between depressive symptoms and mean cortical PIB-BPND in groups of subjects with middle to high PIB-BPND . There was little change in GDS-depression score between subjects with low and middle PIB-BPND levels, while an increase in GDS was shown in the high PIB-BPND group. The main BPND increase was localized to the precuneus/posterior cingulate cortex (PCu/PCC) in subjects with high PIB-BPND , and we found a significant positive relationship between PIB-BPND in this area and depressive symptoms. CONCLUSIONS:Emotional dysregulation because of Aβ neuropathology in the PCu/PCC may relate to depressive symptoms. More specifically, we found that older, cognitively normal patients with depressive episodes were more likely to have underlying AD pathology. Thus, depressive symptoms may increase the predictive ability of the identification of future AD cases. Copyright © 2016 John Wiley & Sons, Ltd.

journal_name

Int J Geriatr Psychiatry

journal_title

International journal of geriatric psychiatry

authors

Yasuno F,Kazui H,Morita N,Kajimoto K,Ihara M,Taguchi A,Yamamoto A,Matsuoka K,Kosaka J,Kudo T,Iida H,Kishimoto T,Nagatsuka K

doi

10.1002/gps.4409

subject

Has Abstract

pub_date

2016-08-01 00:00:00

pages

920-8

issue

eissn

0885-6230

issn

1099-1166

journal_volume

pub_type

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High amyloid-β deposition related to depressive symptoms in older individuals with normal cognition: a pilot study.