Validation of an interferon-gamma enzyme-linked immunosorbent spot assay to evaluate cell-mediated immunity against severe acute respiratory syndrome coronavirus 2
The COVID-19 pandemic forced the rapid development of methods to measure humoral and cellular immunity against SARS-CoV-2. The lack of a global standardized protocol and the high variability of intra- and inter-assay precision of the T-cell response made it difficult to compare T-cell assay results...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2024-12-01
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| Series: | Human Vaccines & Immunotherapeutics |
| Subjects: | |
| Online Access: | https://www.tandfonline.com/doi/10.1080/21645515.2024.2428516 |
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| Summary: | The COVID-19 pandemic forced the rapid development of methods to measure humoral and cellular immunity against SARS-CoV-2. The lack of a global standardized protocol and the high variability of intra- and inter-assay precision of the T-cell response made it difficult to compare T-cell assay results with those of other laboratories. The interferon-gamma enzyme-linked immunosorbent spot (IFN-γ ELISpot) assay for immunogenicity evaluation was validated using naturally infected donor peripheral blood mononuclear cells, a commercially available IFN-γ ELISpot kit, and a SARS-CoV-2 specific peptide pool. Depending on anti-CD3 and peptide pool stimulation, the mean coefficients of variation (CVs) of the intra-assay precision were 19.0% and 13.4%, respectively. The mean CVs of the inter-assay precision were 26.1% and 25.4%, and the mean CVs for reproducibility were 6.7% and 15.9%, respectively. Linearity with an R-squared value between 0.98 and 0.99 was established, and the mean CVs between the lots were 17.6% and 6.6%, depending on the anti-CD3 and peptide pool stimulation, respectively. The limit of detection was 11 spot-forming counts per well. Taken together, we demonstrated that the IFN-γ ELISpot assay is feasible for evaluating SARS-CoV-2-specific cell-mediated immune function through validation based on standard operating procedures. |
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| ISSN: | 2164-5515 2164-554X |