Neuroinflammation in Patients with Chronic Fatigue Syndrome/Myalgic Encephalomyelitis
Yasuhito Nakatomi, Kei Mizuno, Akira Ishii et al. · Brain, Behavior, and Immunity · 2014 · DOI
Quick Summary
Japanese researchers used PET imaging with a neuroinflammation tracer (PK11195) in 9 ME/CFS patients and healthy controls. They found significantly elevated neuroinflammation signals across multiple brain regions in ME/CFS patients, particularly in the cingulate cortex, thalamus, and brainstem — areas regulating fatigue and cognition.
Why It Matters
This study independently corroborated neuroinflammation findings from other groups using direct PET imaging. It identified specific brain regions showing elevated glial activation in ME/CFS, providing anatomical detail to the neuroinflammation hypothesis.
What This Study Does Not Prove
With only 9 ME/CFS patients, this is an underpowered study. The PK11195 tracer has relatively low specificity for microglia vs. macrophages. Replication with larger samples and newer tracers is needed.
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Tags
Metadata
- DOI
- 10.1016/j.bbi.2014.04.001
- Sample size
- 9 patients
- Control group
- Yes
- Review status
- Editor reviewed
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 7 April 2026