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Related Concept Videos

Antidepressant Drugs: MAOIs and Other Agents01:23

Antidepressant Drugs: MAOIs and Other Agents

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Atypical antidepressants, including bupropion (Wellbutrin), mirtazapine (Remeron), nefazodone (Serzone), trazodone (Desyrel), and vilazodone (Viibryd), offer unique mechanisms of action. Bupropion weakly inhibits dopamine and norepinephrine reuptake, aiding depression treatment and smoking cessation, with a low risk of sexual dysfunction. Mirtazapine enhances serotonin and norepinephrine neurotransmission, leading to sedation, increased appetite, and weight gain. As a result, it helps treat...
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Antidepressant Drugs: Tricyclics, SSRIs, and SNRIs01:28

Antidepressant Drugs: Tricyclics, SSRIs, and SNRIs

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Tricyclic Antidepressants (TCAs), including Desipramine (Norpramin), Imipramine (Tofranil), Clomipramine (Anafranil), and Amitriptyline (Elavil), inhibit serotonin and norepinephrine reuptake and also block other receptors. They are used for depression, pain conditions, and insomnia. Common adverse effects include anticholinergic effects, sedation, orthostatic hypotension, and weight gain. They have a narrow therapeutic window and so require plasma-level monitoring. Abrupt discontinuation can...
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Antidepressant Drugs: Overview01:25

Antidepressant Drugs: Overview

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Antidepressant drugs are a class of medications primarily used for treating various mood disorders, including major depression, anxiety disorders, and other related conditions. These medicines work by modulating the neurotransmitter balance within the brain, alleviating depressive symptoms. Antidepressants can be broadly categorized into several groups according to their mechanism of action and chemical structure: Selective Serotonin Reuptake Inhibitors (SSRIs), Serotonin-Norepinephrine...
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Drugs Affecting GI Tract Motility: Serotonin Receptor Agonists01:23

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Serotonin, a crucial neurotransmitter synthesized by enterochromaffin cells, plays a cardinal role in regulating gastrointestinal (GI) motility. With over 90% of the body's total serotonin in the GI tract, its influence on digestive processes is profound. Serotonin is swiftly released upon various stimuli, such as food boluses or certain drugs, triggering intrinsic sensory neurons in the myenteric plexus and extrinsic vagal and spinal sensory neurons. This leads to the activation of the...
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G-protein Coupled Receptors01:21

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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
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Drugs Affecting Neurotransmitter Release or Uptake01:21

Drugs Affecting Neurotransmitter Release or Uptake

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Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...
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Related Experiment Video

Updated: Aug 3, 2025

Network Pharmacology and Validation of the Antidepressant Mechanisms of Qiangzhifang in a Chronic Restraint Stress-induced Depression Rat Model
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Serotonin is a Common Thread Linking Different Classes of Antidepressants.

Colby E Witt1, Sergio Mena2, Jordan Holmes1

  • 1Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, USA.

Research Square
|April 10, 2023
PubMed
Summary

Different antidepressants, despite varied mechanisms, effectively increase serotonin levels in the hippocampus. This suggests serotonin is a common pathway for antidepressant action, linking multiple depression theories.

Keywords:
NRIsSSRIsdepressionketaminemonoamine hypothesisneurogenesisvoltammetry

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Psychiatry

Background:

  • The precise pathology of depression remains unclear, prompting research beyond the traditional monoamine hypothesis.
  • While selective serotonin reuptake inhibitors (SSRIs) are common, their variable efficacy drives the search for novel antidepressant therapies, including ketamine, linked to synaptic plasticity and neurogenesis.
  • Existing evidence suggests diverse antidepressant classes may influence serotonin levels, warranting further investigation.

Approach:

  • This study investigated the effects of acute antidepressant challenges on hippocampal serotonin levels in mice.
  • Serotonin was measured using in vivo voltammetry to assess extracellular concentrations.

Key Points:

  • Pseudo-equivalent doses of different antidepressant classes similarly elevated ambient serotonin levels.
  • Despite distinct pharmacodynamics, including variations in Uptake 1 and 2, SERT trafficking, and histamine modulation, the net effect on extracellular serotonin was comparable.
  • These findings highlight a conserved mechanism of action among effective antidepressants.

Conclusions:

  • Serotonin emerges as a unifying factor linking clinically effective antidepressants, regardless of their primary mechanism of action.
  • These findings support the integration of the monoamine hypothesis with newer theories involving synaptic plasticity and neurogenesis.
  • The study highlights extracellular serotonin as a common neurobiological target for diverse antidepressant therapies.