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Psychol Med. 2015 Jan;45(1):97-108. doi: 10.1017/S003329171400110X. Epub 2014 May 20.

Resting-state brain function in schizophrenia and psychotic bipolar probands and their first-degree relatives.

Author information

1
Huaxi MR Research Center (HMRRC), Department of Radiology,West China Hospital of Sichuan University,Chengdu,People's Republic of China.
2
Department of Psychiatry,University of Chicago,Chicago, IL,USA.
3
Department of Psychiatry and Behavioral Sciences,Northwestern University Feinberg School of Medicine,Chicago, IL,USA.
4
Department of Psychiatry,Duke University Medical Center,Durham, IL,USA.
5
Department of Psychiatry,University of Texas Southwestern Medical School,Dallas, TX,USA.
6
Beth Israel Deaconess Medical Center and Harvard Medical School,Boston, MA,USA.
7
Departments of Psychiatry and Neurobiology,Yale University School of Medicine and Olin Neuropsychiatric Research Center,Hartford, CT,USA.

Abstract

BACKGROUND:

Schizophrenia (SCZ) and psychotic bipolar disorder (PBD) share considerable overlap in clinical features, genetic risk factors and co-occurrence among relatives. The common and unique functional cerebral deficits in these disorders, and in unaffected relatives, remain to be identified.

METHOD:

A total of 59 healthy controls, 37 SCZ and 57 PBD probands and their unaffected first-degree relatives (38 and 28, respectively) were studied using resting-state functional magnetic resonance imaging (rfMRI). Regional cerebral function was evaluated by measuring the amplitude of low-frequency fluctuations (ALFF). Areas with ALFF alterations were used as seeds in whole-brain functional connectivity analysis. We then tested whether abnormalities identified in probands were present in unaffected relatives.

RESULTS:

SCZ and PBD probands both demonstrated regional hypoactivity in the orbital frontal cortex and cingulate gyrus, as well as abnormal connectivity within striatal-thalamo-cortical networks. SCZ probands showed greater and more widely distributed ALFF alterations including the thalamus and bilateral parahippocampal gyri. Increased parahippocampal ALFF was related to positive symptoms and cognitive deficit. PBD patients showed uniquely increased functional connectivity between the thalamus and bilateral insula. Only PBD relatives showed abnormal connectivity within striatal-thalamo-cortical networks seen in both proband groups.

CONCLUSIONS:

The present findings reveal a common pattern of deficits in frontostriatal circuitry across SCZ and PBD, and unique regional and functional connectivity abnormalities that distinguish them. The abnormal network connectivity in PBD relatives that was present in both proband groups may reflect genetic susceptibility associated with risk for psychosis, but within-family associations of this measure were not high.

PMID:
25066779
PMCID:
PMC5836742
DOI:
10.1017/S003329171400110X
[Indexed for MEDLINE]
Free PMC Article

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