title: Differential Resting-State Functional Connectivity of Striatal Subregions in Bipolar Depression and Hypomania.
abstract: Bipolar disorder (BP) is characterized by periods of depression (BPD) and (hypo)mania (BPM), but the underlying state-related brain circuit abnormalities are not fully understood. Striatal functional activation and connectivity abnormalities have been noted in BP, but consistent findings have not been reported. To further elucidate striatal abnormalities in different BP states, this study investigated differences in resting-state functional connectivity of six striatal subregions in BPD, BPM, and healthy control (HC) subjects. Ninety medication-free subjects (30 BPD, 30 BPM, and 30 HC), closely matched for age and gender, were scanned using 3T functional magnetic resonance imaging (fMRI) acquired at resting state. Correlations of low-frequency blood oxygen level dependent signal fluctuations for six previously described striatal subregions were used to obtain connectivity maps of each subregion. Using a factorial design, main effects for differences between groups were obtained and post hoc pairwise group comparisons performed. BPD showed increased connectivity of the dorsal caudal putamen with somatosensory areas such as the insula and temporal gyrus. BPM group showed unique increased connectivity between left dorsal caudate and midbrain regions, as well as increased connectivity between ventral striatum inferior and thalamus. In addition, both BPD and BPM exhibited widespread functional connectivity abnormalities between striatal subregions and frontal cortices, limbic regions, and midbrain structures. In summary, BPD exhibited connectivity abnormalities of associative and somatosensory subregions of the putamen, while BPM exhibited connectivity abnormalities of associative and limbic caudate. Most other striatal subregion connectivity abnormalities were common to both groups and may be trait related.
authors.affiliation: 1 Center for Behavioral Health , Cleveland Clinic, Cleveland, Ohio.
authors.forename: Murat I
authors.initials: MI
authors.lastname: Altinay
authors.affiliation: 1 Center for Behavioral Health , Cleveland Clinic, Cleveland, Ohio.|2 Department of Psychiatry, Indiana University School of Medicine , Indianapolis, Indiana.
authors.forename: Leslie A
authors.initials: LA
authors.lastname: Hulvershorn
authors.affiliation: 1 Center for Behavioral Health , Cleveland Clinic, Cleveland, Ohio.|2 Department of Psychiatry, Indiana University School of Medicine , Indianapolis, Indiana.
authors.forename: Harish
authors.initials: H
authors.lastname: Karne
authors.affiliation: 3 Imaging Institute, Cleveland Clinic , Cleveland, Ohio.
authors.forename: Erik B
authors.initials: EB
authors.lastname: Beall
authors.affiliation: 1 Center for Behavioral Health , Cleveland Clinic, Cleveland, Ohio.|2 Department of Psychiatry, Indiana University School of Medicine , Indianapolis, Indiana.
authors.forename: Amit
authors.initials: A
authors.lastname: Anand
mesh_terms: D000328:Adult; D001714:Bipolar Disorder / Q000503:physiopathology*; D001931:Brain Mapping / Q000379:methods; D016022:Case-Control Studies; D002540:Cerebral Cortex / Q000503:physiopathology; D063132:Connectome; D003342:Corpus Striatum / Q000503:physiopathology*; D005260:Female; D005625:Frontal Lobe / Q000503:physiopathology; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008564:Membrane Potentials; D009434:Neural Pathways / Q000503:physiopathology; D011699:Putamen / Q000503:physiopathology; D013788:Thalamus / Q000503:physiopathology
keywords: bipolar disorder; connectivity; resting state; striatum
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