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Screening NK-, B- and T-cell phenotype and function in patients suffering from Chronic Fatigue Syndrome
Marta Curriu1, Jorge Carrillo, Marta Massanella
1Institut de recerca de la sida, IrsiCaixa-HIVACAT, Institut d'Investigació en Ciències de la Salut Germans Trias I Pujol|, Badalona, Spain.
Insights
Chronic Fatigue Syndrome (CFS) involves distinct T-cell and NK-cell immune signatures. These immune cell differences may help identify CFS patients and explain susceptibility to infections.
Area of Science:
- Immunology
- Neuroscience
Background:
- Chronic Fatigue Syndrome (CFS) is a complex neuro-immune disorder with unknown causes.
- Existing diagnostic methods rely on varied clinical signs, and immunological abnormalities lack consistent patterns.
Purpose of the Study:
- To investigate and identify specific immunological features in Chronic Fatigue Syndrome (CFS).
- To determine if T-cell and NK-cell phenotypes can differentiate CFS patients from healthy individuals.
Main Methods:
- Flow cytometry was used to analyze peripheral blood T, B, and NK cell function and phenotype.
- 22 CFS patients meeting Fukuda criteria and 30 healthy controls were included.
Main Results:
- CFS patients showed altered T-cell subsets, including increased regulatory T cells and decreased CD8+ T-cell activation and effector memory cells.
- Natural Killer (NK) cells in CFS patients displayed distinct surface marker expression (upregulated NKp46, CD69; downregulated CD25).
- Immune cell profiles effectively distinguished CFS individuals from controls.
Conclusions:
- Specific T-cell and NK-cell phenotypes, alongside altered T-cell responses, can potentially identify individuals with CFS.
- The observed reduction in T-cell immunity in CFS may contribute to increased susceptibility to viral infections.
Background:
Chronic Fatigue Syndrome (CFS) is a debilitating neuro-immune disorder of unknown etiology diagnosed by an array of clinical manifestations. Although several immunological abnormalities have been described in CFS, their heterogeneity has limited diagnostic applicability.
Methods:
Immunological features of CFS were screened in 22 CFS diagnosed individuals fulfilling Fukuda criteria and 30 control healthy individuals. Peripheral blood T, B and NK cell function and phenotype were analyzed by flow cytometry in both groups.
Results:
CFS diagnosed individuals showed similar absolute numbers of T, B and NK cells, with minor differences in the percentage of CD4+ and CD8+ T cells. B cells showed similar subset frequencies and proliferative responses between groups. Conversely, significant differences were observed in T cell subsets. CFS individuals showed increased levels of T regulatory cells (CD25+/FOXP3+) CD4 T cells, and lower proliferative responses in vitro and in vivo. Moreover, CD8 T cells from the CFS group showed significantly lower activation and frequency of effector memory cells. No clear signs of T-cell immunosenescence were observed. NK cells from CFS individuals displayed higher expression of NKp46 and CD69 but lower expression of CD25 in all NK subsets defined. Overall, T cell and NK cell features clearly clustered CFS individuals.
Conclusions:
Our findings suggest that alterations in T-cell phenotype and proliferative response along with the specific signature of NK cell phenotype may be useful to identify CFS individuals. The striking down modulation of T cell mediated immunity may help to understand intercurrent viral infections in CFS.
