Serotonin antagonists and reuptake inhibitors treat depression by increasing synaptic serotonin
Clinical and neuroimaging studies consistently demonstrate that serotonin reuptake inhibitors and related antidepressant medications achieve their therapeutic effects in part by binding to and blocking serotonin transporters, thereby increasing synaptic serotonin levels.
Papers [0], [1], [2], and [5] directly support the premise that serotonin reuptake inhibitors act by targeting the serotonin transporter and increasing synaptic availability, aligning with standard pharmacological mechanisms of these antidepressants.
J. Lundberg, M. Tiger, M. Landén, C. Halldin, L. Farde. Serotonin transporter occupancy with TCAs and SSRIs: a PET study in patients with major depressive disorder. 2012. https://doi.org/10.1017/S1461145711001945
Demonstrates that TCAs and SSRIs share a mechanism of action via serotonin transporter inhibition.
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Gwenn S. Smith, Alan Kahn, J. Sacher, P. Rusjan, Thilo van Eimeren, A. Flint, Alan A. Wilson. Serotonin Transporter Occupancy and the Functional Neuroanatomic Effects of Citalopram in Geriatric Depression. 2011. https://doi.org/10.1097/JGP.0b013e318227f83f
Shows that SSRI treatment results in significant serotonin transporter occupancy in human brain regions.
Gwenn S. Smith, H. Kuwabara, Neda F. Gould, Najilla Nassery, A. Savonenko, J. Joo, K. Bigos, M. Kraut, James Robert Brašić, D. Holt, Andrew W. Hall, W. B. Mathews, R. Dannals, A. Nandi, C. Workman. Molecular Imaging of the Serotonin Transporter Availability and Occupancy by Antidepressant Treatment in Late-Life Depression. 2021. https://doi.org/10.1016/j.neuropharm.2021.108447
Finds that antidepressant treatment leads to high serotonin transporter occupancy which correlates with clinical improvement.
Yamamoto M, Hirakata H, Toda K. Neural signaling mechanisms in depression: bridging classical monoamine hypotheses, animal models, and emerging antidepressant strategies.. 2026. https://doi.org/10.3389/fcell.2026.1777975
Confirms that widely prescribed antidepressants like SSRIs and SNRIs were developed based on monoaminergic neurotransmission hypotheses.
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