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Related Experiment Video

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Design and Implementation of an fMRI Study Examining Thought Suppression in Young Women with, and At-risk, for Depression

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Published on: May 19, 2015

The subgenual anterior cingulate cortex in mood disorders.

Wayne C Drevets¹, Jonathan Savitz, Michael Trimble

¹Section on Neuroimaging in Mood and Anxiety Disorders, Molecular Imaging Branch, National Institute of Mental Health, Bethesda, MD, USA. drevetsw@mail.nih.gov

|August 16, 2008

Summary

The subgenual anterior cingulate cortex (sgACC) shows reduced gray matter volume in major depressive disorder (MDD) and bipolar disorder. This brain region is crucial for emotional regulation and stress response, offering new insights into mood disorders.

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Area of Science:

Neuroscience
Psychiatry
Neuroimaging

Background:

The subgenual anterior cingulate cortex (sgACC) plays a role in emotional behavior modulation.
Neuroimaging and lesion studies implicate the sgACC in emotional regulation.

Purpose of the Study:

To investigate structural and metabolic abnormalities in the sgACC in major depressive disorder (MDD) and bipolar disorder.
To explore the functional significance of the sgACC in mood disorders and stress response.

Main Methods:

Combined positron emission tomography (PET) and magnetic resonance imaging (MRI) in human subjects.
Postmortem neuropathological assessments of sgACC tissue.
PET studies examining metabolic activity during different mood states and in response to treatment.

Main Results:

Reduced gray matter volume in the sgACC was observed in subjects with MDD and bipolar disorder, irrespective of mood state.
Neuropathological analysis revealed a reduction in glia, not neurons, in the sgACC of individuals with mood disorders.
Elevated sgACC metabolic activity during depression, which decreased with effective antidepressant treatment.

Conclusions:

The sgACC is a key brain region implicated in the pathophysiology of major depressive disorder and bipolar disorder.
Abnormalities in the sgACC, particularly glial reduction, contribute to emotional dysregulation and stress response deficits in mood disorders.
Targeting the sgACC, through interventions like deep brain stimulation, shows therapeutic potential for treatment-resistant depression.