title: Altered functional connectivity of amygdala underlying the neuromechanism of migraine pathogenesis.
abstract: BACKGROUND
  The amygdala is a large grey matter complex in the limbic system, and it may contribute in the neurolimbic pain network in migraine. However, the detailed neuromechanism remained to be elucidated. The objective of this study is to investigate the amygdala structural and functional changes in migraine and to elucidate the mechanism of neurolimbic pain-modulating in the migraine pathogenesis.
  
  
  METHODS
  Conventional MRI, 3D structure images and resting state functional MRI were performed in 18 normal controls (NC), 18 patients with episodic migraine (EM), and 16 patients with chronic migraine (CM). The amygdala volume was measured using FreeSurfer software and the functional connectivity (FC) of bilateral amygdala was computed over the whole brain. Analysis of covariance was performed on the individual FC maps among groups.
  
  
  RESULTS
  The increased FC of left amygdala was observed in EM compared with NC, and the decreased of right amygdala was revealed in CM compared with NC. The increased FC of bilateral amygdala was observed in CM compared with EM. The correlation analysis showed a negative correlation between the score of sleep quality (0, normal; 1, mild sleep disturbance; 2, moderate sleep disturbance; 3, serious sleep disturbance) and the increased FC strength of left amygdala in EM compared with NC, and a positive correlation between the score of sleep quality and the increased FC strength of left amygdala in CM compared with EM, and other clinical variables showed no significant correlation with altered FC of amygdala.
  
  
  CONCLUSIONS
  The altered functional connectivity of amygdala demonstrated that neurolimbic pain network contribute in the EM pathogenesis and CM chronicization.
authors.affiliation: Department of Radiology, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853, China.|Department of Neurology, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853, China.|Department of Radiology, Hainan Branch of Chinese PLA General Hospital, Beijing, 100853, China.
authors.forename: Zhiye
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Department of Neurology, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Chen
authors.affiliation: Department of Radiology, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853, China.|Department of Radiology, Hainan Branch of Chinese PLA General Hospital, Beijing, 100853, China.
authors.forename: Mengqi
authors.initials: M
authors.lastname: Liu
authors.affiliation: Department of Neurology, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853, China.
authors.forename: Zhao
authors.initials: Z
authors.lastname: Dong
authors.affiliation: Department of Radiology, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853, China. cjr.malin@vip.163.com.
authors.forename: Lin
authors.initials: L
authors.lastname: Ma
authors.affiliation: Department of Neurology, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853, China. yusy1963@126.com.
authors.forename: Shengyuan
authors.initials: S
authors.lastname: Yu
mesh_terms: D000328:Adult; D000679:Amygdala / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D005260:Female; D059907:Functional Neuroimaging; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D008881:Migraine Disorders / Q000000981:diagnostic imaging* / Q000503:physiopathology*
keywords: Amygdala; Functional connectivity; Migraine; Neurolimbic pain network; fMRI