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Multiplex Screening Assay for Identifying Cytotoxic CD8+ T Cell Epitopes.

Chek Meng Poh1, Jian Zheng2, Rudragouda Channappanavar2

  • 1School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China.

Frontiers in Immunology
|March 29, 2020
PubMed
Summary

A new multiplex assay directly measures CD8+ T cell killing activity against 23 specificities simultaneously. This method improves accuracy by distinguishing specific from non-specific cell killing, crucial for vaccine development.

Keywords:
CD8 T cellMERSPlasmodiumcytotoxicityinfluenzamultiplex assay

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Area of Science:

  • Immunology
  • Cellular Biology
  • Assay Development

Background:

  • CD8+ T cell cytotoxicity is critical for adaptive immunity.
  • Current methods for measuring T cell killing are often indirect (e.g., IFNγ production) or limited in scope.
  • Existing direct assays can only measure a few T cell specificities per reaction.

Purpose of the Study:

  • To develop a novel multiplex assay for direct, simultaneous measurement of CD8+ T cell cytotoxicity.
  • To enable high-throughput screening of T cell epitopes and assessment of specific killing activity.
  • To investigate the correlation between IFNγ production and actual cell-killing potential.

Main Methods:

  • Development of a multiplex cytotoxicity assay capable of measuring up to 23 epitope specificities in a single reaction.
  • Inclusion of irrelevant epitopes to differentiate specific from non-specific T cell killing.
  • Application of the assay to human peripheral blood mononuclear cells (PBMCs) and samples from MERS, influenza, and malaria animal models.

Main Results:

  • The assay allows direct, simultaneous measurement of up to 23 CD8+ T cell specificities.
  • The method reduces the need for starting clinical materials for epitope screening.
  • IFNγ production did not consistently correlate with CD8+ T cell killing potential in tested models.
  • The assay demonstrated utility in both human and mouse CD8+ T cells.

Conclusions:

  • The developed multiplex assay offers a practical and comprehensive approach for analyzing CD8+ T cell cytotoxicity.
  • This technique is valuable for systematic screening of T cell epitopes and evaluating vaccine candidates.
  • Direct measurement of cytotoxicity is essential, as IFNγ expression alone may not reflect cell-killing capacity.