Abnormally increased and incoherent resting-state activity is shared between patients with schizophrenia and their unaffected siblings

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• 作者：Chang Liu^a ; ^f ; Zhimin Xue^a ; ^b ; ^f ; Lena Palaniyappan^g ; Li Zhou^a ; ^f ; Haihong Liu^c ; Chang Qi^a ; ^f ; Guowei Wu^a ; ^f ; Tumbwene E. Mwansisya^a ; ^d ; Haojuan Tao^a ; ^f ; Xudong Chen^a ; ^f ; Xiaojun Huang^a ; ^f ; Zhening Liu^a ; ^b ; ^f ; Weidan Pu^e ; ^f ; ^{pulv1128@126.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Schizophrenia ; Unaffected sibling ; Neuronal activity ; Neuronal synchronization ; Resting-state
• 刊名：Schizophrenia Research
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：171
• 期：1-3
• 页码：158-165
• 全文大小：621 K

文摘

Several resting-state neuroimaging studies in schizophrenia indicate an excessive brain activity while others report an incoherent brain activity at rest. No direct evidence for the simultaneous presence of both excessive and incoherent brain activity has been established to date. Moreover, it is unclear whether unaffected siblings of schizophrenia patients who share half of the affected patient's genotype also exhibit the excessive and incoherent brain activity that may render them vulnerable to the development of schizophrenia.

Methods

27 pairs of schizophrenia patients and their unaffected siblings, as well as 27 healthy controls, were scanned using gradient-echo echo-planar imaging at rest. By using amplitude of low-frequency fluctuations (ALFF) and regional homogeneity (Reho), we investigated the intensity and synchronization of local spontaneous neuronal activity in three groups.

Results

We observed that increased amplitude and reduced synchronization (coherence) of spontaneous neuronal activity were shared by patients and their unaffected siblings. The key brain regions with this abnormal neural pattern in both patients and siblings included the middle temporal, orbito-frontal, inferior occipital and fronto-insular gyrus.

Conclusions

This abnormal neural pattern of excessive and incoherent neuronal activity shared by schizophrenia patients and their healthy siblings may improve our understanding of neuropathology and genetic predisposition in schizophrenia.