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Cytometry-based analysis of HLA-G functions according to ILT2 expression.

A Jacquier1, C Dumont2, E D Carosella1

  • 1CEA, DRF-Francois Jacob Institute, Hemato-Immunology Research Department, Saint-Louis Hospital, Paris, France; U976 HIPI Unit, IRSL, Paris University, Paris, France.

Human Immunology
|February 22, 2020
PubMed
Summary

Human Leukocyte Antigen-G (HLA-G) specifically inhibits Natural Killer (NK) and CD8+ T cells expressing its receptor, ILT2. This study introduces a new assay to precisely measure HLA-G

Keywords:
HLA-GILT2

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Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • Human Leukocyte Antigen-G (HLA-G) is known to inhibit Natural Killer (NK) and T cell functions via its receptor, ILT2.
  • Previous studies often used heterogeneous immune cell populations, potentially underestimating HLA-G's specific inhibitory effects.
  • Identifying immune subpopulations sensitive to HLA-G is crucial for understanding its precise role in immune regulation.

Purpose of the Study:

  • To develop and validate a novel flow cytometry assay for evaluating HLA-G's functional effects on specific immune cell subsets.
  • To precisely assess HLA-G-mediated inhibition of cytotoxic functions (IFN-gamma production and CD107a expression) in ILT2-expressing NK and CD8+ T cells.
  • To confirm the specificity of HLA-G inhibition by blocking the HLA-G/ILT2 interaction.

Main Methods:

  • Development of a flow cytometry assay to simultaneously analyze multiple immune cell functions (IFN-gamma production, CD107a expression).
  • Focus on specific immune subpopulations expressing the HLA-G receptor, ILT2, within NK and CD8+ T cells.
  • Comparison of cellular responses in the presence of HLA-G1-expressing target cells and utilization of a blocking antibody against ILT2 to reverse inhibition.

Main Results:

  • The assay successfully discriminated between HLA-G1-responding and non-responding cell subsets in a single tube.
  • HLA-G was confirmed to specifically inhibit cytotoxic functions in ILT2-positive CD8+ T cells and NK cells, but not in ILT2-negative counterparts.
  • Blocking the HLA-G/ILT2 interaction with an anti-ILT2 antibody restored cellular cytotoxicity, validating the specific inhibitory role of HLA-G1.

Conclusions:

  • The developed flow cytometry methodology provides a precise and efficient way to investigate HLA-G's immune functions.
  • This method allows for fine-tuned analysis of HLA-G effects on specific immune cell lineages and receptor interactions.
  • The findings have potential applications in understanding and managing pathological contexts such as cancer and transplantation.