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, often following an infection.
• Patients frequently report symptoms suggestive of an initial infectious trigger.

Purpose of the Study:

• To investigate the multi-omics (metabolomic, proteomic) and immune response profiles in ME/CFS patients.
• To assess how exercise impacts these biological profiles in ME/CFS compared to healthy individuals.

Main Methods:

• Plasma metabolomic and proteomic profiling.
• Analysis of immune responses to microbial stimulation before and after exercise.
• Correlation of biological findings with symptom severity.

Main Results:

• ME/CFS patients exhibit an exaggerated innate immune response to microbial antigens and impaired energy metabolism (citric acid cycle, fatty acid beta-oxidation, urea cycle).
• Findings include systemic inflammation, lipid abnormalities, disrupted extracellular matrix, reduced cell adhesion, gut dysbiosis, complement activation, and redox imbalance.
• These abnormalities were exacerbated by exercise in ME/CFS patients and correlated with symptom intensity.

Conclusions:

• The study reveals a complex interplay of immune, metabolic, and inflammatory dysregulation in ME/CFS, worsened by exertion.
• These multi-omics and immune findings offer potential therapeutic targets for ME/CFS and PEM.