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Spontaneous, persistent, T cell-dependent IFN-γ release in patients who progress to Long Covid
Benjamin A Krishna1,2, Eleanor Y Lim1,2,3, Marina Metaxaki1
1Cambridge Institute of Therapeutic Immunology and Infectious Disease (CITIID), Cambridge CB2 0AW, UK.
Persistent high interferon-gamma (IFN-γ) levels in Long Covid patients indicate a potential immune mechanism. This finding aids in developing diagnostic biomarkers and targeted therapies for Long Covid.
Area of Science:
- Immunology
- Infectious Diseases
- Virology
Background:
- Long Covid, persistent symptoms after SARS-CoV-2 infection, lacks understood mechanisms.
- Identifying biomarkers for diagnosis and treatment of Long Covid is crucial.
Purpose of the Study:
- To investigate the immunological mechanisms underlying Long Covid.
- To identify potential biomarkers for Long Covid diagnosis and monitoring.
Main Methods:
- Utilized highly sensitive FluoroSpot assays to detect cytokine release from peripheral blood mononuclear cells.
- Analyzed CD8+ T cell and CD14+ cell involvement in interferon-gamma (IFN-γ) production.
- Conducted longitudinal follow-up of patients with Long Covid.
Main Results:
- Persistently elevated levels of interferon-γ (IFN-γ) were detected in Long Covid patients, independent of ex vivo stimulation.
- IFN-γ release was mediated by CD8+ T cells and dependent on CD14+ cell antigen presentation.
- Decreased IFN-γ levels correlated with symptom improvement and resolution in Long Covid patients.
Conclusions:
- Sustained IFN-γ production by CD8+ T cells may be a key immunological feature of Long Covid.
- This finding suggests IFN-γ as a potential biomarker for Long Covid.
- Highlights a target for developing novel therapeutics for Long Covid.
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