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Hippocampal subfield-specific connectivity findings in major depressive disorder: A 7 Tesla diffusion MRI study.

Abstract：

OBJECTIVE:Diffusion magnetic resonance imaging (dMRI) enables non-invasive characterization of white matter (WM) structures in vivo. Prior studies suggest that certain WM tracts may be affected in major depressive disorder (MDD), however, hippocampal subfield-specific dMRI measures have not yet been explored in MDD. We use 7 Tesla dMRI to investigate differences in hippocampal subfield connectivity of MDD patients. METHODS:Eighteen MDD patients and eighteen matched healthy volunteers underwent 7 Tesla MRI. The hippocampal formations were segmented by subfields and tractography was performed to determine streamline count (SC), fractional anisotropy (FA), and mean diffusivity (MD) in patients and controls. Significant subfield connectivity measures were also correlated with age at depression onset. RESULTS:Compared with controls, MDD patients exhibited reduced SC in the molecular layer of the left dentate gyrus (p < 0.001). SC count in the left dentate gyrus was shown to positively correlate with age at disease onset (p < 0.05). Increased MD was observed in streamlines emanating from both the left (p = 0.0001) and right (p < 0.001) fimbriae in MDD patients. CONCLUSIONS:Increased MD of tracts in the fimbriae suggests compromised neuronal membranes in the major hippocampal output gate. Reduced SC of the dentate gyri indexes a disruption of normal cellular processes such as neurogenesis. These findings may have significant implications for identifying biomarkers of MDD and elucidating the neurobiological underpinnings of depression.

journal_name

J Psychiatr Res

journal_title

Journal of psychiatric research

authors

Rutland JW,Brown S,Verma G,Feldman RE,Sharma H,Markowitz M,Schneider M,Delman BN,Murrough J,Balchandani P

doi

10.1016/j.jpsychires.2019.02.008

subject

Has Abstract

pub_date

2019-04-01 00:00:00

pages

186-192

eissn

0022-3956

issn

1879-1379

pii

S0022-3956(18)31125-7

journal_volume

111

pub_type

杂志文章

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