Evidence of inflammatory immune signaling in chronic fatigue syndrome: A pilot study of gene expression in peripheral blood.

Observed Findings

• B cell-specific gene set expression (6-gene set) was significantly lower in CFS compared to controls, primarily driven by reduced PTPRK and TSPAN3 expression
• CD14+ monocyte and CD16+ neutrophil gene sets showed abnormally strong co-expression in CFS patients (p=0.01) and fatigue phenotype groups
• CD14+ monocyte and CD19+ B cell gene sets displayed significant coordinated expression in CFS (p=0.00), absent in controls
• CD8+ T cell gene set expression was significantly negatively correlated with CD19+ B cell genes (p=0.02) and NK cell genes (p=0.08) in CFS, but not in controls
• These distinctive co-expression patterns were characteristic of CFS and fatigue phenotype groups but absent in healthy control subjects

Inferred Conclusions

• B cell dysfunction occurs in ME/CFS, characterized by reduced expression of specific B cell-associated genes
• Abnormal immune network restructuring in CFS involves coordinated activation of monocytes and neutrophils coupled with altered B cell function, supporting a model of persistent inflammatory immune signaling
• Antibody-mediated or B cell-driven suppression of NK cell and CD8+ T cell activity may contribute to immune dysregulation in ME/CFS
• The identified CD19+ B cell genes could serve as biomarkers for early detection and objective phenotyping of ME/CFS

Remaining Questions