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Amygdala network dysfunction in late-life depression phenotypes: Relationships with symptom dimensions. J Psychiatr Res 2015 Nov;70:121-9

Date

10/02/2015

Pubmed ID

26424431

Pubmed Central ID

PMC4605880

DOI

10.1016/j.jpsychires.2015.09.002

Scopus ID

2-s2.0-84943373502   15 Citations

Abstract

The amygdala, a crucial hub of the emotional processing neural system, has been implicated in late-life depression (LLD) pathophysiology. However, the overlapping and diverging amygdala network function abnormalities underlying two clinical LLD phenotypes (i.e., LLD alone and LLD with mild cognitive impairment [LLD-MCI]) are unknown. The aim of this study is to investigate the amygdala functional connectivity (FC) differences between LLD alone, LLD-MCI and healthy controls, and to examine the relationships between amygdala network dysfunction and symptom dimensions. A resting-state functional connectivity magnetic resonance imaging study was conducted to probe amygdala FC in a total of 63 elderly participants (LLD [n = 22], LLD-MCI [n = 15], and age- and gender-equated healthy older adults [n = 26]) using a seed-based voxelwise R-fcMRI approach. LLD-only adults showed increased FC in the posterior default mode and vermis, and diminished connections in the fronto-parietal, salience and temporal areas, relative to controls. The LLD-MCI participants showed diminished FC in the default mode, cognitive control, salience and visual regions, whereas increased FC was limited to lateral parietal cortex compared with healthy controls. The LLD-MCI group also showed diminished FC in the occipital and posterior default mode areas, relative to the LLD-only group. Distinct amygdala FC abnormalities that explain depressive and anxiety symptom severity, and executive functioning were identified. The amygdala FC impairments may distinguish LLD phenotypes. These functional network abnormalities may also explain the heterogeneity seen in the LLD clinical presentations.

Author List

Li W, Ward BD, Xie C, Jones JL, Antuono PG, Li SJ, Goveas JS

Authors

Piero G. Antuono MD Professor in the Neurology department at Medical College of Wisconsin
Joseph S. Goveas MD Professor in the Psychiatry department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Age of Onset
Aged
Aging
Amygdala
Antidepressive Agents
Brain Mapping
Depressive Disorder
Female
Humans
Magnetic Resonance Imaging
Male
Neural Pathways
Neuropsychological Tests
Phenotype