Maes, Michael, Mihaylova, Ivana, Kubera, Marta et al. · Progress in neuro-psychopharmacology & biological psychiatry · 2012 · DOI
This study looked at immune system markers in people with depression, comparing them to healthy controls. Researchers measured chemicals called neopterin and inflammatory proteins in the blood and found they were higher in depressed patients, especially those with melancholia (severe depression with physical symptoms). These same markers were also linked to chronic fatigue symptoms, suggesting that immune system activation may play a role in both depression and fatigue.
ME/CFS patients often experience depression and fatigue alongside immune dysfunction, making studies linking immune activation to fatigue symptoms highly relevant. This research suggests that objective immune markers (neopterin, TNFα) may be associated with fatigue clusters in depressive illness, which could inform understanding of post-viral fatigue and inflammatory mechanisms in ME/CFS. Understanding shared immune pathways between depression and chronic fatigue could lead to better diagnostic tools and targeted treatments.
This study does not prove that immune activation causes depression or fatigue—it only shows association. The cross-sectional design cannot establish temporal relationships or whether immune markers change before, during, or after symptom onset. Results in depressed patients cannot be directly extrapolated to ME/CFS patients without separate investigation, as the underlying pathophysiology may differ.
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, Mihaylova, Ivana, Kubera, Marta, & Ringel, Karl (2012). Activation of cell-mediated immunity in depression: association with inflammation, melancholia, clinical staging and the fatigue and somatic symptom cluster of depression.. Progress in neuro-psychopharmacology & biological psychiatry. https://doi.org/10.1016/j.pnpbp.2011.09.006
BibTeX
@article{mecfsatlas-maes-2012-activation-cell,
author = {Maes, Michael and Mihaylova, Ivana and Kubera, Marta and Ringel, Karl},
title = {Activation of cell-mediated immunity in depression: association with inflammation, melancholia, clinical staging and the fatigue and somatic symptom cluster of depression.},
journal = {Progress in neuro-psychopharmacology & biological psychiatry},
year = {2012},
doi = {10.1016/j.pnpbp.2011.09.006},
note = {PubMed: 21945535},
url = {https://www.mecfsatlas.com/evidence/maes-2012-activation-cell},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/maes-2012-activation-cell
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