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Developing a Rat Model for Bipolar Disorder
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State dependent cortico-amygdala circuit dysfunction in bipolar disorder.

Roscoe O Brady1, Grace A Masters2, Ian T Mathew3

  • 1Department of Psychiatry, Beth Israel Deaconess Medical Center, Boston, MA, United States; Psychotic Disorders Division, McLean Hospital, Belmont, MA, United States; Department of Psychiatry, Harvard Medical School, Boston, MA, United States.

Journal of Affective Disorders
|May 14, 2016
PubMed
Summary
This summary is machine-generated.

Bipolar mania shows disrupted brain connectivity, particularly between the amygdala and frontal cortex, impacting emotion regulation. This finding may explain the emotional dysregulation seen in manic episodes.

Keywords:
Bipolar disorderEuthymiaImagingManiaResting statefMRI

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Brain Imaging

Background:

  • Bipolar disorder pathophysiology involves disrupted neural circuits for emotion and reward.
  • Few fMRI studies compare brain activity across mood states in bipolar disorder.
  • Investigating circuit abnormalities in mania is crucial for understanding pathophysiology.

Purpose of the Study:

  • To test if bipolar mania is linked to altered connectivity between cortical and subcortical regions.
  • To identify specific brain circuit disruptions associated with manic symptoms.

Main Methods:

  • Resting-state fMRI scans were performed on 28 manic bipolar subjects, 24 euthymic bipolar subjects, and 23 healthy controls.
  • Functional connectivity was analyzed for selected cortical and subcortical brain regions.
  • Whole-brain analysis was employed to examine connectivity patterns.

Main Results:

  • Bipolar mania showed decreased functional connectivity between the amygdala and anterior cingulate cortex (ACC).
  • Increased amygdala connectivity with dorsal frontal cortical regions was observed in mania.
  • These changes differentiate manic states from euthymic states.

Conclusions:

  • Manic bipolar subjects exhibit disrupted functional connectivity involving the amygdala and emotion-regulating brain regions compared to euthymic subjects.
  • Altered neural circuit activity in emotion regulation may underlie manic episodes.
  • Findings highlight specific neurobiological correlates of manic symptomatology.