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Keeley AJ, Carducci M, Massai L, Pizza M, de Silva TI, Moriel DG, Rossi O. Development and Characterisation of a Four-Plex Assay to Measure Streptococcus pyogenes Antigen-Specific IgG in Human Sera. Methods Protoc 2022; 5:55. [PMID: 35893581 PMCID: PMC9326740 DOI: 10.3390/mps5040055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 06/21/2022] [Accepted: 06/22/2022] [Indexed: 11/17/2022] Open
Abstract
The measurement of antibodies to vaccine antigens is crucial for research towards a safe and effective vaccine for Streptococcus pyogenes (Strep A). We describe the establishment and detailed characterisation of a four-plex assay to measure IgG to the Strep A vaccine antigens SpyCEP, Slo, SpyAD and GAC using the Luminex multiplex platform. A standard curve was established and characterized to allow the quantification of antigen-specific IgG. Assay specificity, precision, linearity, reproducibility and repeatability were determined via the measurement of antigen-specific IgG from pooled human serum. The assay is highly specific, reproducible and performs well across a large range of antibody concentrations against all four antigens. It is, therefore, suitable for future clinical trials in humans with a four-component vaccine, as well as for seroepidemiological studies to gain insights into naturally occurring immunity.
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Affiliation(s)
- Alexander J. Keeley
- Department of Clinical Research, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK;
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield S10 2TN, UK;
- Vaccines and Immunity Theme, Medical Research Unit the Gambia at the London School of Hygiene and Tropical Medicine, Atlantic Boulevard, Fajara, P. O. Box 273, The Gambia
| | - Martina Carducci
- GSK Vaccines Institute for Global Health (GVGH), Via Fiorentina 1, 53100 Siena, Italy; (M.C.); (L.M.); (M.P.); (D.G.M.)
| | - Luisa Massai
- GSK Vaccines Institute for Global Health (GVGH), Via Fiorentina 1, 53100 Siena, Italy; (M.C.); (L.M.); (M.P.); (D.G.M.)
| | - Mariagrazia Pizza
- GSK Vaccines Institute for Global Health (GVGH), Via Fiorentina 1, 53100 Siena, Italy; (M.C.); (L.M.); (M.P.); (D.G.M.)
| | - Thushan I. de Silva
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, Sheffield S10 2TN, UK;
- Vaccines and Immunity Theme, Medical Research Unit the Gambia at the London School of Hygiene and Tropical Medicine, Atlantic Boulevard, Fajara, P. O. Box 273, The Gambia
| | - Danilo G. Moriel
- GSK Vaccines Institute for Global Health (GVGH), Via Fiorentina 1, 53100 Siena, Italy; (M.C.); (L.M.); (M.P.); (D.G.M.)
| | - Omar Rossi
- GSK Vaccines Institute for Global Health (GVGH), Via Fiorentina 1, 53100 Siena, Italy; (M.C.); (L.M.); (M.P.); (D.G.M.)
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