A novel method linking antigen presentation by human monocyte-derived macrophages to CD8+ T cell polyfunctionality

Kirsty R Short, Emma J. Grant, Marloes Vissers, Patrick C Reading, Dimitri A Diavatopoulos, Katherine Kedzierska

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3 Citations (Scopus)

Abstract

To understand the interactions between innate and adaptive immunity, and specifically how virally infected macrophages impact T cell function, novel assays examining the ability of macrophages to present antigen to CD8+ T cells are needed. In the present study, we have developed a robust in vitro assay to measure how antigen presentation by human monocyte-derived macrophages (MDMs) affects the functional capacity of autologous CD8+ T cells. The assay is based on the polyfunctional characteristics of antigen-specific CD8+ T cells, and is thus called a Mac-CD8 Polyfunctionality Assay. Following purification of monocytes and their maturation to MDMs, MDMs were pulsed with an antigenic peptide to be presented to CD8+ T cells. Peptide-pulsed MDMs were then incubated with antigen-specific CD8+ T cells in order to assess the efficacy of antigen presentation to T cells. CD8+ T cell polyfunctionality was assessed by staining with mAbs to IFN-γ, TNF-α, and CD107a in a multi-color intracellular cytokine staining assay. To highlight the utility of the Mac-CD8 Polyfunctionality Assay, we assessed the effects of influenza infection on the ability of human macrophages to present antigen to CD8+ T cells. We found that influenza infection of human MDMs can alter the effector efficacy of MDMs to activate more CD8+ T cells with cytotoxic capacity. This has important implications for understanding how the virus-infected macrophages affect adaptive immunity at the site of infection.

Original languageEnglish
Article numberArticle 389
JournalFrontiers in Immunology
Volume4
Issue numberNOV
DOIs
Publication statusPublished - 2013
Externally publishedYes

Keywords

  • Antigen presentation
  • CD8 T cells
  • Influenza virus
  • Macrophages
  • Polyfunctionality

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