Maes, Michael, Ringel, Karl, Kubera, Marta et al. · Journal of affective disorders · 2012 · DOI
This study found that people with depression have more antibodies attacking serotonin (a brain chemical) compared to healthy people, especially those with severe depression. These antibodies were linked to higher inflammation, immune activation, fatigue, and cognitive problems. The more depressive episodes someone had experienced, the more likely they were to have these antibodies, suggesting that repeated depression may change the immune system over time.
ME/CFS patients frequently experience comorbid depression and report serotonin-related symptoms (cognitive dysfunction, mood changes). This study provides a mechanistic link between immune activation, autoimmunity, and serotonin dysfunction—pathways implicated in ME/CFS pathophysiology. Understanding whether similar anti-5-HT autoimmunity occurs in ME/CFS or contributes to depression in ME/CFS patients could inform treatment approaches.
This study does not prove that anti-5-HT antibodies *cause* depression; correlation does not establish causation. The findings are from depressed populations and cannot be directly generalized to ME/CFS without replication in that population. Cross-sectional design means temporal sequencing—whether antibodies precede or follow depression onset—cannot be determined.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Maes, Michael, Ringel, Karl, Kubera, Marta, Berk, Michael, & Rybakowski, Janusz (2012). Increased autoimmune activity against 5-HT: a key component of depression that is associated with inflammation and activation of cell-mediated immunity, and with severity and staging of depression.. Journal of affective disorders. https://doi.org/10.1016/j.jad.2011.11.016
BibTeX
@article{mecfsatlas-maes-2012-increased-autoimmune,
author = {Maes, Michael and Ringel, Karl and Kubera, Marta and Berk, Michael and Rybakowski, Janusz},
title = {Increased autoimmune activity against 5-HT: a key component of depression that is associated with inflammation and activation of cell-mediated immunity, and with severity and staging of depression.},
journal = {Journal of affective disorders},
year = {2012},
doi = {10.1016/j.jad.2011.11.016},
note = {PubMed: 22166399},
url = {https://www.mecfsatlas.com/evidence/maes-2012-increased-autoimmune},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-29. https://www.mecfsatlas.com/evidence/maes-2012-increased-autoimmune
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