Mitochondrial Measures in Primary Cells Isolated from Patients with ME/CFS.
Allan, Claire Y, Katsaros, Tina, Missailidis, Daniel et al. · Methods in molecular biology (Clifton, N.J.) · 2025 · DOI
Quick Summary
This study describes laboratory methods to test how well the mitochondria (the energy factories in our cells) are working in people with ME/CFS. Researchers took two types of cells from ME/CFS patients—fibroblasts (skin cells) and immune cells from the blood—and used special dyes and measurements to check if these cells have problems with energy production, cellular damage, or stress responses. These techniques could help scientists understand whether mitochondrial problems contribute to ME/CFS symptoms.
Why It Matters
Many ME/CFS patients experience profound fatigue that may be linked to impaired energy production at the cellular level. By providing standardized methods to measure mitochondrial function in patient-derived cells, this study enables researchers worldwide to investigate whether and how mitochondria are dysfunctional in ME/CFS, potentially leading to new diagnostic tests or treatments targeting energy metabolism.
Observed Findings
Protocol development for measuring mitochondrial mass using fluorescent cellular dyes in ME/CFS patient cells
Techniques for assessing mitochondrial membrane potential as a marker of cellular energy status
Methods to quantify reactive oxygen species (oxidative stress markers) in patient-derived fibroblasts and PBMCs
Approaches to measure NAD/NADH ratios reflecting cellular energy metabolism
FRET-based measurements enabling quantification of TORC1 and AMPK signaling in patient cells
Inferred Conclusions
Primary fibroblasts and PBMCs from ME/CFS patients are suitable cellular models for investigating mitochondrial dysfunction
Multiple complementary measurement techniques are necessary to comprehensively assess mitochondrial function and cellular energy metabolism
These standardized methods can be applied across research laboratories to investigate potential mitochondrial contributions to ME/CFS pathogenesis
Cells can be challenged with various substrates and stressors to reveal context-dependent mitochondrial abnormalities
Remaining Questions
What specific mitochondrial abnormalities do these methods reveal in ME/CFS patients compared to healthy controls?
What This Study Does Not Prove
This is a methods paper describing laboratory techniques rather than a clinical study reporting new findings about ME/CFS patients. It does not prove that mitochondrial dysfunction causes ME/CFS symptoms, nor does it establish how common or severe mitochondrial abnormalities are in the ME/CFS population. The relationship between cellular mitochondrial changes and patients' clinical symptoms remains to be determined.