Chao, C C, DeLaHunt, M, Hu, S et al. · Clinical immunology and immunopathology · 1992 · DOI
Researchers infected mice with agents that trigger immune system activation and found that the mice became fatigued—they ran much less on their exercise wheels and took longer to groom themselves after swimming. The infected mice also showed elevated levels of a immune signaling molecule called TGF-beta, which is also found at high levels in ME/CFS patients. This study suggests that an overly active immune response may be directly responsible for the fatigue experienced in ME/CFS.
This study provides experimental evidence that immune activation can directly cause fatigue symptoms, offering a mechanistic link between immune dysfunction and ME/CFS. The finding that TGF-β elevation parallels fatigue suggests a potential biomarker and therapeutic target for ME/CFS patients. A validated animal model for ME/CFS-like fatigue enables future studies of treatment strategies and underlying biological mechanisms.
This study does not prove that all human ME/CFS is immunologically mediated, nor does it establish that TGF-β is the sole cause of fatigue in patients. The presence of elevated TGF-β in both this model and CFS patients shows correlation, not necessarily causation in human disease. Results in inbred laboratory mice may not fully translate to the heterogeneous human population with ME/CFS.
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
Chao, C C, DeLaHunt, M, Hu, S, Close, K, & Peterson, P K (1992). Immunologically mediated fatigue: a murine model.. Clinical immunology and immunopathology. https://doi.org/10.1016/0090-1229(92)90194-s
BibTeX
@article{mecfsatlas-chao-1992-immunologically-mediated,
author = {Chao, C C and DeLaHunt, M and Hu, S and Close, K and Peterson, P K},
title = {Immunologically mediated fatigue: a murine model.},
journal = {Clinical immunology and immunopathology},
year = {1992},
doi = {10.1016/0090-1229(92)90194-s},
note = {PubMed: 1643746},
url = {https://www.mecfsatlas.com/evidence/chao-1992-immunologically-mediated},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-27. https://www.mecfsatlas.com/evidence/chao-1992-immunologically-mediated
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