Abnormal functional connectivity of the amygdala is associated with depressive symptoms in patients with multiple system atrophy
Authors Zhao B, Liu H, Li H, Shang X
Received 29 June 2018
Accepted for publication 3 October 2018
Published 15 November 2018 Volume 2018:14 Pages 3133—3142
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Ms Justinn Cochran
Peer reviewer comments 3
Editor who approved publication: Dr Yu-Ping Ning
Bin Zhao,1,2 Hu Liu,3 Huanhuan Li,3 Xiuli Shang1
1Department of Neurology, The First Affiliated Hospital of China Medical University, Shenyang 110001, China; 2Department of Neurology, Shenyang Fifth People Hospital, Shenyang 110023, China; 3Department of Radiology, The First Affiliated Hospital of China Medical University, Shenyang 110001, China
Purpose: Depressive symptoms are frequent nonmotor symptoms that occur in multiple system atrophy (MSA) patients. However, possible changes that can present in the amygdala (AMY) functional connectivity (FC) of the brain in MSA patients with depressive symptoms (DMSA patients) remain largely unknown.
Materials and methods: Resting-state functional magnetic resonance imaging scans were obtained from 29 DMSA patients, 28 MSA patients without depression symptoms (NDMSA patients), and 34 healthy controls (HCs). FC was analyzed by defining the bilateral AMY as the seed region. Correlation analysis was performed between the FC and clinical scores.
Results: When compared with NDMSA patients, DMSA patients showed increased bilateral AMY FC in the left middle frontal gyrus (MFG) and decreased right AMY FC in the left middle occipital gyrus. Moreover, the AMY FC values in the left middle frontal cortex were positively correlated with the Hamilton Depression Rating Scale-17 item scores. Furthermore, relative to the HCs, DMSA patients presented decreased bilateral AMY FC values in the visuospatial cortex, sensorimotor networks, and limbic areas.
Conclusion: Depressive symptoms are associated with AMY–MFG FC anomalies in MSA patients. We propose that the middle frontal cortex may play an important role in the neuropathophysiology of depression in MSA patients.
Keywords: multiple system atrophy, depression, functional magnetic resonance imaging, functional connectivity, amygdala
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