Rapid determination of Epstein-Barr virus-specific CD8(+) T-cell frequencies by flow cytometry

Area of Science:

• Immunology
• Virology
• Cellular Biology

Background:

• Epstein-Barr virus (EBV) poses challenges in monitoring immune responses.
• Accurate quantification of EBV-specific CD8(+) T-cells is crucial for understanding EBV-related diseases.

Purpose of the Study:

• To develop and validate an efficient and rapid method for detecting Epstein-Barr virus (EBV)-specific CD8(+) T-cell frequencies.
• To compare the sensitivity of this new method against established techniques.

Main Methods:

• Stimulation of peripheral blood mononuclear cells (PBMCs) or cytotoxic T lymphocyte (CTL) lines with autologous lymphoblastoid cell lines.
• Intracellular interferon gamma (IFNγ) detection via multiparameter flow cytometry.
• Confirmation of T-cell receptor (TCR) class I restriction and assessment of additional cytokine production using monoclonal antibodies (MoAbs).

Main Results:

• EBV-specific CD8(+) T-cell frequencies in healthy carriers ranged from 0.63% to 1.29%.
• The flow cytometric assay demonstrated higher sensitivity compared to limiting dilution analysis and enzyme-linked immunospot (ELISPOT) assays.
• The assay confirmed class I restriction of IFNγ production.

Conclusions:

• The developed flow cytometric assay is a sensitive and rapid tool for quantifying EBV-specific CD8(+) T-cell responses.
• This method offers significant advantages for evaluating patients with EBV-related conditions.
• The assay facilitates comprehensive analysis of EBV-specific CTL functionality, including cytokine profiles.