OBJECTIVE: This study used resting-state functional MRI (fMRI) to evaluate regional and network alterations in patients with Parkinson's disease (PD) with and without depression. METHOD: We recruited 29 patients with PD with depression (PD-Dep), 30 patients with PD without depression (PD-NDep), and 30 normal controls. All participants underwent resting-state fMRI scans on a 3-T MR system. The amplitude of low-frequency fluctuation (ALFF) of blood oxygen level-dependent signals was used to characterise regional cerebral function. Functional integration of the brain network was evaluated by seed-based correlation approach. RESULTS: The PD-Dep group showed significantly higher ALFF value in the left orbitofrontal area compared with both the PD-NDep and control groups (p<0.05 corrected by FWE). In patients with PD, the Hamilton Depression Rating Scale score was positively correlated with the ALFF value in the left orbitofrontal cortex (p<0.005 uncorrected). Brain network connectivity analysis revealed reduced functional connectivity of putamen in both PD subgroups. However, the PD-Dep group showed more distributed reduced connectivity in the prefrontal-limbic network than the PD-NDep group did (p<0.05 corrected by FWE). CONCLUSIONS: Our study demonstrates that PD-Dep patients are characterised by increased regional spontaneous neural activity in the orbitofrontal area and decreased functional integration within the prefrontal-limbic network. These findings may be helpful for facilitating further understanding of the potential mechanisms underlying depression in PD.
OBJECTIVE: This study used resting-state functional MRI (fMRI) to evaluate regional and network alterations in patients with Parkinson's disease (PD) with and without depression. METHOD: We recruited 29 patients with PD with depression (PD-Dep), 30 patients with PD without depression (PD-NDep), and 30 normal controls. All participants underwent resting-state fMRI scans on a 3-T MR system. The amplitude of low-frequency fluctuation (ALFF) of blood oxygen level-dependent signals was used to characterise regional cerebral function. Functional integration of the brain network was evaluated by seed-based correlation approach. RESULTS: The PD-Dep group showed significantly higher ALFF value in the left orbitofrontal area compared with both the PD-NDep and control groups (p<0.05 corrected by FWE). In patients with PD, the Hamilton Depression Rating Scale score was positively correlated with the ALFF value in the left orbitofrontal cortex (p<0.005 uncorrected). Brain network connectivity analysis revealed reduced functional connectivity of putamen in both PD subgroups. However, the PD-Dep group showed more distributed reduced connectivity in the prefrontal-limbic network than the PD-NDep group did (p<0.05 corrected by FWE). CONCLUSIONS: Our study demonstrates that PD-Deppatients are characterised by increased regional spontaneous neural activity in the orbitofrontal area and decreased functional integration within the prefrontal-limbic network. These findings may be helpful for facilitating further understanding of the potential mechanisms underlying depression in PD.
Authors: Meghan C Campbell; Jonathan M Koller; Abraham Z Snyder; Chandana Buddhala; Paul T Kotzbauer; Joel S Perlmutter Journal: Neurology Date: 2015-05-15 Impact factor: 9.910
Authors: Leonardo Almeida; Bilal Ahmed; Roger Walz; Sol De Jesus; Addie Patterson; Daniel Martinez-Ramirez; David Vaillancourt; Dawn Bowers; Herbert Ward; Michael S Okun; Nikolaus R McFarland Journal: Mov Disord Clin Pract Date: 2016-06-24
Authors: Joseph Classen; Jiri Koschel; Christian Oehlwein; Klaus Seppi; Peter Urban; Christian Winkler; Ullrich Wüllner; Alexander Storch Journal: J Neural Transm (Vienna) Date: 2017-07-12 Impact factor: 3.575
Authors: Masoud Tahmasian; Simon B Eickhoff; Kathrin Giehl; Frank Schwartz; Damian M Herz; Alexander Drzezga; Thilo van Eimeren; Angela R Laird; Peter T Fox; Habibolah Khazaie; Mojtaba Zarei; Carsten Eggers; Claudia R Eickhoff Journal: Cortex Date: 2017-04-08 Impact factor: 4.027