Heightened innate immunity may trigger chronic inflammation, fatigue and post-exertional malaise in ME/CFS

Area of Science:

• Biochemistry
• Immunology
• Metabolomics
• Proteomics

Background:

• Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) presents with debilitating fatigue, post-exertional malaise (PEM), and cognitive issues.
• Patients often report infectious prodromes, suggesting a potential trigger for the condition.

Purpose of the Study:

• To investigate the multi-omic (metabolomic, proteomic, immune response) alterations in ME/CFS patients.
• To examine the impact of exercise on these physiological markers.
• To identify potential therapeutic targets for ME/CFS and PEM.

Main Methods:

• Plasma metabolomic and proteomic profiling.
• Assessing immune responses to microbial stimulation before and after exercise.
• Multi-omics data analysis to identify correlations with symptoms.

Main Results:

• Evidence of exaggerated innate immune responses to microbial antigens.
• Impaired energy metabolism (citric acid cycle, fatty acid oxidation, urea cycle).
• Systemic inflammation, lipid abnormalities, disrupted extracellular matrix, gut dysbiosis, complement activation, redox imbalance, and tryptophan-serotonin pathway dysregulation.
• Many abnormalities exacerbated by exercise and correlated with symptom severity.

Conclusions:

• ME/CFS is associated with widespread metabolic and immune dysregulation.
• Exercise significantly worsens these physiological abnormalities.
• Findings provide a basis for developing targeted ME/CFS and PEM therapies.