title: Mapping the effect of escitalopram treatment on amplitude of low-frequency fluctuations in patients with depression: a resting-state fMRI study.
abstract: Antidepressant medications represent the most common treatment option for major depressive disorder (MDD), but the neuro-psychological mechanisms by which antidepressants act to improve depressive symptoms remain under-specified. We designed this study to assess the effects of escitalopram treatment on spontaneous brain activity of MDD patients using functional magnetic resonance imaging (fMRI). Twenty first-episode drug-naive MDD patients received resting-state fMRI scans before and after 8 weeks of treatment with a selective serotonin reuptake inhibitor - escitalopram. Twenty age- and gender-matched healthy controls were also scanned twice with an 8-week interval. The fractional amplitude of low-frequency fluctuation (fALFF) was used to characterize the spontaneous brain activity. The analysis of covariance (ANCOVA) was performed to determine treatment-related changes in fALFF. The symptoms were significantly improved in MDD patients after treatment. We observed significant group-by-time interaction on fALFF in the left dorsomedial prefrontal cortex, the right middle frontal gyrus, and the left putamen. Post-hoc analyses showed that the fALFF values in these regions were significantly higher in the MDD patients compared to healthy controls at baseline and were reduced after treatment. The findings suggest that abnormalities in the brain areas involved in emotional processing and regulation could be normalized by effective antidepressant treatment with escitalopram in the MDD patients and free of a task situation.
authors.affiliation: National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital/ Institute of Mental Health), and the Key Laboratory of Mental Health, Ministry of Health (Peking University), No. 51 Hua Yuan Bei Road, Hai Dian District, Beijing, 100191, China.
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.affiliation: National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital/ Institute of Mental Health), and the Key Laboratory of Mental Health, Ministry of Health (Peking University), No. 51 Hua Yuan Bei Road, Hai Dian District, Beijing, 100191, China.
authors.forename: Xueni
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Radiology, 306 Hospital of People's Liberation Army, Beijing, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Li
authors.affiliation: National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital/ Institute of Mental Health), and the Key Laboratory of Mental Health, Ministry of Health (Peking University), No. 51 Hua Yuan Bei Road, Hai Dian District, Beijing, 100191, China.
authors.forename: Yunai
authors.initials: Y
authors.lastname: Su
authors.affiliation: Department of Radiology, 306 Hospital of People's Liberation Army, Beijing, China.
authors.forename: Yawei
authors.initials: Y
authors.lastname: Zeng
authors.affiliation: Mood Disorders Center, Beijing Anding Hospital, Capital Medical University, Beijing, China.
authors.forename: Qinge
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Mood Disorders Center, Beijing Anding Hospital, Capital Medical University, Beijing, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
authors.affiliation: Department of Radiology, 306 Hospital of People's Liberation Army, Beijing, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Jin
authors.affiliation: National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital/ Institute of Mental Health), and the Key Laboratory of Mental Health, Ministry of Health (Peking University), No. 51 Hua Yuan Bei Road, Hai Dian District, Beijing, 100191, China. qingmeikong@163.com.|Clinical Psychopharmacology Division, Institute of Mental Health, Peking University, No. 51 Hua Yuan Bei Road, Hai Dian District, Beijing, 100191, China. qingmeikong@163.com.
authors.forename: Qingmei
authors.initials: Q
authors.lastname: Kong
authors.affiliation: National Clinical Research Center for Mental Disorders (Peking University Sixth Hospital/ Institute of Mental Health), and the Key Laboratory of Mental Health, Ministry of Health (Peking University), No. 51 Hua Yuan Bei Road, Hai Dian District, Beijing, 100191, China. si.tian-mei@163.com.|Clinical Psychopharmacology Division, Institute of Mental Health, Peking University, No. 51 Hua Yuan Bei Road, Hai Dian District, Beijing, 100191, China. si.tian-mei@163.com.
authors.forename: Tianmei
authors.initials: T
authors.lastname: Si
mesh_terms: D000328:Adult; D000928:Antidepressive Agents / Q000494:pharmacology / Q000627:therapeutic use*; D001921:Brain / Q000000981:diagnostic imaging / Q000187:drug effects*; D015283:Citalopram / Q000494:pharmacology / Q000627:therapeutic use*; D003865:Major Depressive Disorder / Q000000981:diagnostic imaging / Q000188:drug therapy*; D005260:Female; D059907:Functional Neuroimaging; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D017367:Selective Serotonin Reuptake Inhibitors / Q000494:pharmacology / Q000627:therapeutic use*; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D000928:Antidepressive Agents; D015283:Citalopram; D017367:Selective Serotonin Reuptake Inhibitors
keywords: Amplitude of low-frequency fluctuation; Antidepressant; Escitalopram; Major depressive disorder; Resting state; fMRI