Biological vulnerability to depression: linked structural and functional brain network findings.
N L Nixon1, P F Liddle, E Nixon
1N. L. Nixon, MBBS, MRCPsych, MMedSci, P. F. Liddle, BMBCh, MRCPsych, PhD, E. Nixon, PhD, G. Worwood, MBBCh, MRCPsych, MMedSci, Division of Psychiatry and Applied Psychology, Institute of Mental Health, University of Nottingham, Nottingham, UK; M. Liotti, MD, PhD, Department of Psychology, Simon Fraser University, Burnaby, Canada; L. Palaniyappan, MBBS, MRCPsych, PhD, Centre for Translational Neuroimaging, Division of Psychiatry and Applied Psychology, Institute of Mental Health, University of Nottingham, Nottingham, UK.
The British Journal of Psychiatry : the Journal of Mental Science
|December 21, 2013
Summary
Recovered major depressive disorder (MDD) patients show abnormal brain connectivity. This study links default mode network (DMN) hyperconnectivity with reduced gyrification in recovered MDD, suggesting biological vulnerability.
Area of Science:
- Neuroimaging
- Psychiatry
- Neuroscience
Background:
- Patients recovering from major depressive disorder (MDD) face a high risk of relapse.
- Psychological factors influencing relapse are known, but biological mechanisms remain unclear.
- The default mode network (DMN) is implicated in MDD vulnerability, yet specific hypotheses in recovered states are untested.
Purpose of the Study:
- To investigate excessive DMN functional connectivity during task performance in recovered MDD patients.
- To examine associated abnormalities in DMN cortical gyrification.
- To explore the link between structural and functional DMN changes in recovered MDD.
Main Methods:
- A multimodal neuroimaging approach combining structural and functional MRI.
- Task-based functional connectivity analysis to assess DMN activity.
- Cortical folding analysis to evaluate DMN region gyrification.
- Comparison between 20 recovered MDD patients and 20 matched healthy controls.
Main Results:
- The MDD group exhibited significant task-based DMN hyperconnectivity.
- This hyperconnectivity was associated with hypogyrification in critical DMN regions, specifically the bilateral precuneus.
- Findings indicate a co-occurrence of functional and structural DMN abnormalities.
Conclusions:
- This study provides the first evidence of interconnected structural and functional DMN abnormalities in recovered MDD.
- These findings support hypotheses suggesting biological vulnerability in recovered MDD patients.
- The results highlight the DMN's role in the pathophysiology and recurrence risk of major depressive disorder.
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