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Mapping the effect of escitalopram treatment on amplitude of low-frequency fluctuations in patients with depression: a resting-state fMRI study

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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.

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Acknowledgments

We thank the funding from National Key Technology R&D Program (2015BAI13B01), National Key Basic Research Program of China (973 Program) (2013CB531305; 2012CB720704) and research grants from the “12th Five-year-plan” of National Key Technologies R&D Program of China (2011ZX09302-004).

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Authors and Affiliations

  1. 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

    Li Wang, Xueni Li, Yunai Su, Qingmei Kong & Tianmei Si

  2. Clinical Psychopharmacology Division, Institute of Mental Health, Peking University, No. 51 Hua Yuan Bei Road, Hai Dian District, Beijing, 100191, China

    Qingmei Kong & Tianmei Si

  3. Department of Radiology, 306 Hospital of People’s Liberation Army, Beijing, China

    Ke Li, Yawei Zeng & Zhen Jin

  4. Mood Disorders Center, Beijing Anding Hospital, Capital Medical University, Beijing, China

    Qinge Zhang & Gang Wang

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  1. Li Wang
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  2. Xueni Li
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  3. Ke Li
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  4. Yunai Su
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  9. Qingmei Kong
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  10. Tianmei Si
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Correspondence to Qingmei Kong or Tianmei Si.

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The authors report no conflict of interest in conducting this study and preparing the manuscript.

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Li Wang, Xueni Li contributed equally to the paper.

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Wang, L., Li, X., Li, K. et al. Mapping the effect of escitalopram treatment on amplitude of low-frequency fluctuations in patients with depression: a resting-state fMRI study. Metab Brain Dis 32, 147–154 (2017). https://doi.org/10.1007/s11011-016-9871-5

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