Wolff, Brian S, Alshawi, Sarah A, Feng, Li Rebekah et al. · Brain, behavior, & immunity - health · 2021 · DOI
Researchers gave mice targeted radiation to the pelvis (similar to cancer treatment) and found that the mice became less active afterward—a fatigue-like behavior. They discovered that inflammation, particularly a protein called IL-6, plays a key role in causing this fatigue. When they reduced inflammation using a drug called minocycline or using mice genetically unable to trigger certain inflammatory pathways, the fatigue was reduced but not completely eliminated.
ME/CFS patients experience severe fatigue with unclear underlying mechanisms, and radiation-induced fatigue shares clinical features with post-viral fatigue states. This study provides preclinical evidence that inflammatory pathways, particularly IL-6 signaling, can drive fatigue-like behavior, offering potential therapeutic targets that may be relevant to understanding and treating fatigue in ME/CFS.
This study was conducted in mice exposed to acute radiation and does not directly prove that IL-6 or inflammation causes fatigue in ME/CFS patients or other human populations. The incomplete resolution of fatigue-like behavior even when inflammation was reduced indicates that inflammation alone is insufficient to explain the full mechanism of fatigue. Findings from a single acute insult model may not translate to chronic fatigue conditions.
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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