Related Experiment Video
Updated: Sep 29, 2025
Characterization of Immune Cell-derived Extracellular Vesicles and Studying Functional Impact on Cell Environment
Published on: June 2, 2020
Comparative Analysis of Extracellular Vesicles in Patients with Severe and Mild Myalgic Encephalomyelitis/Chronic
Hector Bonilla1, Dylan Hampton2, Erika G Marques de Menezes2
1Department of Medicine, Stanford University, Palo Alto, CA, United States.
Abstract:
Myalgic encephalomyelitis, or chronic fatigue syndrome (ME/CFS) is a serious disease whose cause has yet to be identified. Objective markers of the disease are also not well understood and would serve as important tools in diagnosis and management. One potential biomarker or transmitter of immune signals in ME/CFS is the extracellular vesicle (EV) compartment. These small, membrane bound particles have been shown to play a key role in intercellular signaling. Our laboratory has focused on methods of detection of EVS in clinical samples. In this study we explored whether the prevalence of EVs in the plasma of participants with mild or severe ME/CFS differed from the plasma of healthy control participants. By staining for multiple cell surface molecules, plasma EVs could be fingerprinted as to their cell of origin. Our study revealed a significant correlation between severe ME/CSF and levels of EVs bearing the B cell marker CD19 and the platelet marker CD41a, though these changes were not significant after correction for multiple comparisons. These findings point to potential dysregulation of B cell and platelet activation or homeostasis in ME/CFS, which warrants validation in a replication cohort and further exploration of potential mechanisms underlying the association.
Insights
Researchers investigated extracellular vesicles (EVs) in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). Severe ME/CFS showed correlations with B cell and platelet EVs, suggesting potential immune dysregulation.
Area of Science:
- Immunology
- Biochemistry
- Cell Biology
Background:
- Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a complex disease with unidentified causes and poorly understood objective markers.
- Extracellular vesicles (EVs) are crucial for intercellular communication and represent a potential avenue for identifying biomarkers in ME/CFS.
- Current diagnostic and management strategies for ME/CFS lack objective markers, highlighting the need for further research.
Purpose of the Study:
- To investigate the prevalence of extracellular vesicles (EVs) in the plasma of individuals with mild or severe ME/CFS compared to healthy controls.
- To determine if specific cell surface markers on EVs can differentiate ME/CFS patient groups.
- To explore potential links between EV profiles and immune cell dysregulation in ME/CFS.
Main Methods:
- Plasma samples from ME/CFS patients (mild and severe) and healthy controls were analyzed for extracellular vesicle (EV) content.
- EVs were stained for multiple cell surface molecules to identify their cell of origin (fingerprinting).
- Statistical analysis was performed to compare EV levels between groups, including those bearing B cell (CD19) and platelet (CD41a) markers.
Main Results:
- A significant correlation was observed between severe ME/CFS and elevated levels of EVs expressing the B cell marker CD19.
- A significant correlation was also found between severe ME/CFS and increased levels of EVs expressing the platelet marker CD41a.
- These correlations, while notable, did not remain significant after correction for multiple comparisons, indicating a need for further investigation.
Conclusions:
- The study suggests potential dysregulation in B cell and platelet activation or homeostasis in individuals with severe ME/CFS.
- Elevated levels of specific EVs may serve as preliminary indicators of immune system alterations in ME/CFS.
- Further validation in a replication cohort and mechanistic studies are warranted to confirm these findings and elucidate underlying pathways.
