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Cortical thickness and VBM-DARTEL in late-life depression

Lookup NU author(s): Dr Sean Colloby, Dr Michael Firbank, Dr Akshya Vasudev, Dr Steve Parry, Professor Alan Thomas, Professor John O'Brien

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Abstract

Background: Numerous studies have revealed structural brain changes in late life depression, mainly in white matter or whole lobes with few focussing just on grey matter (GM). The objective was to investigate GM changes in older depressed and similar aged healthy subjects using two different methods, cortical thickness in frontal lobe structures and voxel-based morphometry (VBM). Methods: Sixty eight subjects participated (30 healthy comparison subjects, 38 depressed) and underwent 3T T1 MR imaging as well as clinical and cognitive assessments. Frontal cortical thickness was measured using FreeSurfer while VBM was undertaken using the DARTEL algorithm in SPM8. Group differences in cortical thickness and GM volumes were assessed using ANCOVA. Effects of cortical thickness and VBM results on cognitive and depression variables were also investigated. Results: No significant differences in frontal lobe cortical thickness were observed between groups (F-1,F- 62 <= 2.7, p >= 0.1). In addition, no significant relationships of cortical thickness on cognitive and depression scores were identified (partial correlation vertical bar r'vertical bar = 0.01-0.31, p >= 0.06). VBM showed that GM volumes were indistinguishable between groups but significant age effects were apparent, independent of diagnosis. Conclusions: Results suggest that cortical GM changes in late life depression (LLD) are similar to healthy older subjects and appear to be related to age rather than cognitive or depressive symptoms. Changes to white matter and subcortical GM structures may be more relevant in explaining the underlying neurobiology of LLD. (C) 2011 Elsevier B.V. All rights reserved.


Publication metadata

Author(s): Vasudev A; O'Brien JT; Parry SW; Colloby SJ; Thomas AJ; Firbank MJ

Publication type: Article

Publication status: Published

Journal: Journal of Affective Disorders

Year: 2011

Volume: 133

Issue: 1-2

Pages: 158-164

Print publication date: 08/05/2011

ISSN (print): 0165-0327

ISSN (electronic): 1573-2517

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.jad.2011.04.010

DOI: 10.1016/j.jad.2011.04.010


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