Review

.2023 Jul;101(6):491-503.

doi: 10.1111/imcb.12636. Epub 2023 Mar 21.

T-cell activation-induced marker assays in health and disease

Chad Poloni^{1 2}, Cole Schonhofer^{1 2}, Sabine Ivison^{2 3}, Megan K Levings^{2 3}, Theodore S Steiner^#^{1 2}, Laura Cook^#^{1 4 5}

Affiliations

¹ Division of Infectious Diseases, Department of Medicine, University of British Columbia, Vancouver, BC, Canada.
² BC Children's Hospital Research Institute, Vancouver, BC, Canada.
³ Department of Surgery, University of British Columbia, Vancouver, BC, Canada.
⁴ Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia.
⁵ Department of Critical Care, Melbourne Medical School, University of Melbourne, Melbourne, Australia.

^# Contributed equally.

PMID:36825901
PMCID: PMC10952637
DOI: 10.1111/imcb.12636

Review

T-cell activation-induced marker assays in health and disease

Chad Poloni et al. Immunol Cell Biol.2023 Jul.

.2023 Jul;101(6):491-503.

doi: 10.1111/imcb.12636. Epub 2023 Mar 21.

Authors

Chad Poloni^{1 2}, Cole Schonhofer^{1 2}, Sabine Ivison^{2 3}, Megan K Levings^{2 3}, Theodore S Steiner^#^{1 2}, Laura Cook^#^{1 4 5}

Affiliations

¹ Division of Infectious Diseases, Department of Medicine, University of British Columbia, Vancouver, BC, Canada.
² BC Children's Hospital Research Institute, Vancouver, BC, Canada.
³ Department of Surgery, University of British Columbia, Vancouver, BC, Canada.
⁴ Department of Microbiology and Immunology, University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, Australia.
⁵ Department of Critical Care, Melbourne Medical School, University of Melbourne, Melbourne, Australia.

^# Contributed equally.

PMID:36825901
PMCID: PMC10952637
DOI: 10.1111/imcb.12636

Abstract

Activation-induced marker (AIM) assays have proven to be an accessible and rapid means of antigen-specific T-cell detection. The method typically involves short-term incubation of whole blood or peripheral blood mononuclear cells with antigens of interest, where autologous antigen-presenting cells process and present peptides in complex with major histocompatibility complex (MHC) molecules. Recognition of peptide-MHC complexes by T-cell receptors then induces upregulation of activation markers on the T cells that can be detected by flow cytometry. In this review, we highlight the most widely used activation markers for assays in the literature while identifying nuances and potential downfalls associated with the technique. We provide a summary of how AIM assays have been used in both discovery science and clinical studies, including studies of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) immunity. This review primarily focuses on AIM assays using human blood or peripheral blood mononuclear cell samples, with some considerations noted for tissue-derived T cells and nonhuman samples. AIM assays are a powerful tool that enables detailed analysis of antigen-specific T-cell frequency, phenotype and function without needing to know the precise antigenic peptides and their MHC restriction elements, enabling a wider analysis of immunity generated following infection and/or vaccination.

Keywords: AIM; CD4+ T cells; antigen-specific response; flow cytometry.

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Conflict of interest statement

MKL received research funding from Bristol‐Myers Squibb and Takeda for work unrelated to this review. TSS received research funding from Merck, Sanofi Pasteur, Rebiotix, Seres, NuBiyota, Edesa, Summit and Pfizer for work unrelated to this review. The other authors have no commercial or financial interests to report.

Figures

**Figure 1**
An overview of validated cell surface markers, and the stimulation time required for their optimal surface expression, to detect human antigen–specific CD4⁺ and CD8⁺ T cells using flow cytometric activation‐induced marker (AIM) assays. PBMC, peripheral blood mononuclear cell; PD‐L1, programmed death‐ligand 1.

See this image and copyright information in PMC

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T-cell activation-induced marker assays in health and disease

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T-cell activation-induced marker assays in health and disease

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