title: Resting state corticolimbic connectivity abnormalities in unmedicated bipolar disorder and unipolar depression.
abstract: This study for the first time investigated resting state corticolimbic connectivity abnormalities in unmedicated bipolar disorder (BD) and compared them with findings in healthy controls and unipolar major depressive disorder (MDD) patient groups. Resting state correlations of low frequency BOLD fluctuations (LFBF) in echoplanar functional magnetic resonance (fMRI) data were acquired from a priori defined regions of interests (ROIs) in the pregenual anterior cingulate cortex (pgACC), dorsomedial thalamus (DMTHAL), pallidostriatum (PST) and amygdala (AMYG), to investigate corticolimbic functional connectivity in unmedicated BD patients in comparison to healthy subjects and MDD patients. Data were acquired from 11 unmedicated BD patients [six manic (BDM) and five depressed (BDD)], and compared with data available from 15 unmedicated MDD and 15 healthy subjects. BD patients had significantly decreased pgACC connectivity to the left and right DMTHAL, similar to findings seen in MDD. Additionally, BD patients had decreased pgACC connectivity with the left and right AMYG as well as the left PST. An exploratory analysis revealed that both BDD and BDM patients had decreased connectivity between the pgACC and DMTHAL. The results of the study indicate a common finding of decreased corticolimbic functional connectivity in different types of mood disorders.
authors.affiliation: Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN, USA. aanand@iupui.edu
authors.forename: Amit
authors.initials: A
authors.lastname: Anand
authors.forename: Yu
authors.initials: Y
authors.lastname: Li
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Lowe
authors.forename: Mario
authors.initials: M
authors.lastname: Dzemidzic
mesh_terms: D000328:Adult; D000679:Amygdala / Q000473:pathology / Q000503:physiopathology; D001143:Arousal / Q000502:physiology*; D001714:Bipolar Disorder / Q000175:diagnosis / Q000473:pathology / Q000503:physiopathology*; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000473:pathology / Q000503:physiopathology*; D003337:Corpus Callosum / Q000473:pathology / Q000503:physiopathology; D003342:Corpus Striatum / Q000473:pathology / Q000503:physiopathology; D003865:Major Depressive Disorder / Q000175:diagnosis / Q000473:pathology / Q000503:physiopathology*; D004292:Dominance, Cerebral / Q000502:physiology; D005260:Female; D005917:Globus Pallidus / Q000473:pathology / Q000503:physiopathology; D006179:Gyrus Cinguli / Q000473:pathology / Q000503:physiopathology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008032:Limbic System / Q000473:pathology / Q000503:physiopathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D020645:Mediodorsal Thalamic Nucleus / Q000473:pathology / Q000503:physiopathology; D008875:Middle Aged; D009415:Nerve Net / Q000473:pathology / Q000503:physiopathology; D010101:Oxygen Consumption / Q000502:physiology*; D012016:Reference Values; D055815:Young Adult