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Multiplex Screening Assay for Identifying Cytotoxic CD8(+) T Cell Epitopes

The cytotoxicity of epitope-specific CD8(+) T cells is usually measured indirectly through IFNγ production. Existing assays that directly measure this activity are limited mainly to measurements of up to two specificities in a single reaction. Here, we develop a multiplex cytotoxicity assay that all...

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Detalles Bibliográficos
Autores principales: Poh, Chek Meng, Zheng, Jian, Channappanavar, Rudragouda, Chang, Zi Wei, Nguyen, Thi H. O., Rénia, Laurent, Kedzierska, Katherine, Perlman, Stanley, Poon, Leo L. M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7078160/
https://www.ncbi.nlm.nih.gov/pubmed/32218786
http://dx.doi.org/10.3389/fimmu.2020.00400
Descripción
Sumario:The cytotoxicity of epitope-specific CD8(+) T cells is usually measured indirectly through IFNγ production. Existing assays that directly measure this activity are limited mainly to measurements of up to two specificities in a single reaction. Here, we develop a multiplex cytotoxicity assay that allows direct, simultaneous measurement of up to 23 different specificities of CD8(+) T cells in a single reaction. This can greatly reduce the amount of starting clinical materials for a systematic screening of CD8(+) T cell epitopes. In addition, this greatly enhanced capacity enables the incorporation of irrelevant epitopes for determining the non-specific killing activity of CD8(+) T cells, thereby allowing to measure the actual epitope-specific cytotoxicity activities. This technique is shown to be useful to study both human and mouse CD8(+) T cells. Besides, our results from human PBMCs and three independent infectious animal models (MERS, influenza and malaria) further reveal that IFNγ expression by epitope-specific CD8(+) T cells does not always correlate with their cell-killing potential, highlighting the need for using cytotoxicity assays in specific contexts (e.g., evaluating vaccine candidates). Overall, our approach opens up new possibilities for comprehensive analyses of CD8(+) T cell cytotoxicity in a practical manner.