Cited by 281Treatment of Major DepressionNeurotransmitter Receptor Influence on BehaviorTryptophan and brain disorders

Is serotonin an upper or a downer? The evolution of the serotonergic system and its role in depression and the antidepressant response.

Andrews, Paul W., Bharwani, Aadil, Lee, Kyuwon R., Fox, Molly, Thomson, J. Anderson·2015·Neuroscience & Biobehavioral Reviews

Abstract

The role of serotonin in depression and antidepressant treatment remains unresolved despite decades of research. In this paper, we make three major claims. First, serotonin transmission is elevated in multiple depressive phenotypes, including melancholia, a subtype associated with sustained cognition. The primary challenge to this first claim is that the direct pharmacological effect of most symptom-reducing medications, such as the selective serotonin reuptake inhibitors (SSRIs), is to increase synaptic serotonin. The second claim, which is crucial to resolving this paradox, is that the serotonergic system evolved to regulate energy. By increasing extracellular serotonin, SSRIs disrupt energy homeostasis and often worsen symptoms during acute treatment. Our third claim is that symptom reduction is not achieved by the direct pharmacological properties of SSRIs, but by the brain's compensatory responses that attempt to restore energy homeostasis. These responses take several weeks to develop, which explains why SSRIs have a therapeutic delay. We demonstrate the utility of our claims by examining what happens in animal models of melancholia and during acute and chronic SSRI treatment.

Integrity signals

Registry

Crossref · 10.1016/j.neubiorev.2015.01.018

Cites

457 of 457 references verified0 citation errors · 0 not checkable

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  • Depression confers specific social advantages to help keep social problems in mental focus.

    “‘depression’ (a disorder characterized by cognitive rumination) confers specific social advantages to help keep social problems in mental focus”

    From Hypernatural Monitoring: A Social Rehearsal Account of Smartphone Addiction (2018) · cites this paper as Andrews et al., 2015

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Authors
Andrews, P. W., Bharwani, A., Lee, K. R., Fox, M., & Thomson, J. A.
Affiliations
  • McMaster University (CA)
  • University of California, Irvine (US)
  • University of Virginia (US)
Corresponding author
Andrews, Paul W.
Venue
Neuroscience & Biobehavioral Reviews
Publisher
Elsevier BV
Published
2015-04
Volume
51
Pages
164-188
ISSN
0149-7634 (ISSN-L)
OpenAlex
W2163250198
Cited by
281
References
459
Citations by year
2026: 12 · 2025: 13 · 2024: 25 · 2023: 21 · 2022: 20 · 2021: 34 · 2020: 31 · 2019: 36 · 2018: 37 · 2017: 24 · 2016: 17 · 2015: 10
FWCI
3.69
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience & Biobehavioral Reviews (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
Keywords
serotonin, depression, antidepressant response, selective serotonin reuptake inhibitors, melancholia, energy homeostasis, treatment delay, animal models of depression
MeSH terms
Animals, Antidepressive Agents, Brain, Depressive Disorder, Humans, Serotonin, Selective Serotonin Reuptake Inhibitors

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

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