Fomicheva, E E, Filatenkova, T A, Rybakina, E G · Rossiiskii fiziologicheskii zhurnal imeni I.M. Sechenova · 2009
Researchers used an animal model to study how ME/CFS might affect the stress hormone system in the body. They gave rats a substance that mimics a viral infection, then tested whether the animals' adrenal glands (which produce cortisol, the main stress hormone) still responded normally. They found that the stress hormone system became less responsive, suggesting that an infection-like trigger could disrupt how the body regulates stress hormones.
Many ME/CFS patients experience abnormal cortisol patterns and reduced stress hormone responses, and understanding what causes this dysfunction could lead to better diagnostic tools and treatments. This animal model provides mechanistic insights into how an infection-like trigger might cause lasting changes in the body's stress-response system, supporting the hypothesis that HPA axis dysregulation in ME/CFS may originate from immune activation.
This study does not prove that Poly I:C injection in rats exactly replicates human ME/CFS or that the observed acute changes persist long-term. It is an animal model and does not directly demonstrate that the same HPA axis mechanisms occur in ME/CFS patients. Causation in humans cannot be inferred from a single-injection animal study.
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 →
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