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Wang D.,Tianjin Medical University | Zhou Y.,Tianjin Medical University | Zhuo C.,Tianjin Medical University | Zhuo C.,Tianjin Mental Health Center | And 5 more authors.
Translational Psychiatry | Year: 2015

Schizophrenia patients have shown altered resting-state functional connectivity (rsFC) of the cingulate cortex; however, it is unknown whether rsFCs of the cingulate subregions are differentially affected in this disorder. We aimed to clarify the issue by comparing rsFCs of each cingulate subregion between healthy controls and schizophrenia patients. A total of 102 healthy controls and 94 schizophrenia patients underwent resting-state functional magnetic resonance imaging with a sensitivity-encoded spiral-in imaging sequence to reduce susceptibility-induced signal loss and distortion. The cingulate cortex was divided into nine subregions, including the subgenual anterior cingulate cortex (ACC), areas 24 and 32 of the pregenual ACC, areas 24 and 32 of the anterior mid-cingulate cortex (aMCC), posterior MCC (pMCC), dorsal (dPCC) and ventral (vPCC) posterior cingulate cortex (PCC) and retrosplenial cortex (RSC). The rsFCs of each cingulate subregion were compared between the two groups and the atrophy effect was considered. Results with and without global signal regression were reported. Most cingulate subregions exhibited decreased rsFCs in schizophrenia after global signal regression (GSR). Without GSR, only increased rsFC was found in schizophrenia, which primarily restricted to the aMCC, PCC and RSC. Some of these increased rsFCs were also significant after GSR. These findings suggest that GSR can greatly affect between-group differences in rsFCs and the consistently increased rsFCs may challenge the functional disconnection hypothesis of schizophrenia. © 2015 Macmillan Publishers Limited.

Zhu J.,Tianjin Medical University | Zhuo C.,Tianjin Anning Hospital | Zhuo C.,Tianjin Mental Health Center | Qin W.,Tianjin Medical University | And 4 more authors.
Journal of Psychiatric Research | Year: 2015

Small sample sizes and large inter-subject variations result in inconsistent findings in resting-state cerebral blood flow (CBF) in schizophrenia. The CBF connectivity alterations in schizophrenia remain unclear. Recently, three-dimensional pseudo-continuous arterial spin labeling (pcASL) imaging was performed to measure the resting-state CBF in 100 schizophrenia patients and 94 healthy comparison subjects. The normalized CBF was used to reduce the inter-subject variations. Both group comparisons in the CBF and correlations between the CBF alterations and clinical parameters were assessed. The CBF connectivity of the brain regions with regional CBF differences was also compared between the groups. Compared with the healthy controls, the schizophrenia patients exhibited increased CBF in the bilateral inferior temporal gyri, thalami and putamen and decreased CBF in the left insula and middle frontal gyrus and the bilateral anterior cingulate cortices and middle occipital gyri. In the schizophrenia patients, significant correlations were identified between the CBF and clinical parameters. Importantly, the schizophrenia patients exhibited CBF disconnections between the left thalamus and right medial superior frontal gyrus and between the left insula and left postcentral gyrus. Our results suggest that schizophrenia patients may exhibit both regional CBF abnormalities and deficits in CBF connectivity, which may underlie the clinical symptoms of schizophrenia. © 2015 Elsevier Ltd.

Sun L.-L.,Peking University | Sun L.-L.,Tianjin Mental Health Center | Zhang Y.,Peking University | Liu J.-F.,Peking University | And 6 more authors.
International Journal of Neuropsychopharmacology | Year: 2013

Melanin-concentrating hormone (MCH) is a neuropeptide and its receptor is extensively expressed throughout the brain. MCH has been suggested to regulate the rewarding and reinforcing effects of psychostimulants by potentiating the dopaminergic system within the midbrain. Moreover, MCH and its receptor can regulate ERK activity. The present study investigated the role of MCH in the nucleus accumbens (NAc) in rats behaviourally sensitized to methamphetamine (Meth). We found that the development of Meth-induced locomotor sensitization was attenuated by MCH infused into the NAc shell but not core. Moreover, the elevation of ERK phosphorylation in the NAc shell induced by Meth was inhibited by locally infused MCH. Infusion of the MCH receptor 1 (MCHR1) antagonist SNAP 94847 into the NAc shell but not core augmented the initiation of locomotor sensitization and amplitude of elevated phosphorylated ERK levels induced by Meth. The expression of Meth-induced locomotor sensitization and ERK alterations after 1 wk withdrawal were not affected by either MCH or SNAP 94847 infused into the NAc shell or core. These results indicate that MCH in the NAc shell plays a critical role in the development but not expression of Meth-induced locomotor sensitization in rats, which might be mediated by the ERK signalling pathway. Our study suggests that MCH might be a potential target for the treatment of Meth addiction. © CINP 2013.

Zhang Q.,Tianjin Mental Health Center | Gage J.,University of Canterbury | Barnett P.,University of Canterbury
Shanghai Archives of Psychiatry | Year: 2013

Background: Migration imposes stress and may contribute to the incidence of mental illness among natives of mainland China living overseas. Both cultural norms and service inadequacies may act as barriers to accessing needed mental health services. Objective: Assess New Zealand health providers' perspectives on the utilization of mental health services by immigrants from mainland China. Methods: A qualitative study in Christchurch, New Zealand involved in-depth interviews with nine mental health professionals with experience in providing services to Chinese clients. The interviews were transcribed and thematically analysed. Results: Four main themes emerged from the interviews: (1) specific mental health concerns of Chinese migrants; (2) subgroups of migrants most likely to manifest mental health problems; (3) barriers to accessing services; and (4) the centrality of social support networks to the mental health of Chinese migrants. Conclusions: Qualitative research with health providers in high-income countries who provide mental health services to the growing numbers of migrants from mainland China can identify areas where improved cultural sensitivity could increase both the utilization of mental health services by Chinese immigrants and the effectiveness of these services. Copyright © 2013 by Editorial Department of the Shanghai Archives of Psychiatry.

Zhou Y.,Tianjin Medical University | Ma X.,Tianjin Medical University | Wang D.,Tianjin Medical University | Qin W.,Tianjin Medical University | And 4 more authors.
PLoS ONE | Year: 2015

Objective: Although extensive resting-state functional connectivity (rsFC) changes have been reported in schizophrenia, rsFC changes of the frontal pole (FP) remain unclear. The FP contains several subregions with different connection patterns; however, it is unknown whether the FP subregions are differentially affected in schizophrenia. To explore this possibility, we compared rsFC differences of the FP subregions between schizophrenia patients and healthy controls. Method: One hundred healthy controls and 91 patients with schizophrenia underwent resting-state functional MRI with a sensitivity-encoded spiral-in (SENSE-SPIRAL) imaging sequence to reduced susceptibility-induced signal loss and distortion. The FP was subdivided into the orbital (FPo), medial (FPm), and lateral (FPl) subregions. Mean fMRI time series were extracted for each FP subregion and entered into a seed-based rsFC analysis. Results: The FP subregions exhibited differential rsFC patterns in both healthy controls and schizophrenia patients. Direct comparison between groups revealed reduced rsFCs between the bilateral FPl and several cognitive-related regions, including the dorsolateral prefrontal cortex, medial prefrontal cortex, anterior cingulate cortex, posterior cingulate cortex/precuneus, temporal cortex and inferior parietal lobule in schizophrenia. Although the FPl exhibited obvious atrophy, rsFC changes were unrelated to volumetric atrophy in the FPl, to duration of illness, and to antipsychotic medication dosage. No significant differences were observed in the rsFCs of other FP subregions. Conclusion: These findings suggest a selective (the lateral subregion) functional disconnection of the FP subregions in schizophrenia. © 2015 Zhou et al.

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