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HLA-G: An Immune Checkpoint Molecule.

Edgardo D Carosella1, Nathalie Rouas-Freiss1, Diana Tronik-Le Roux1

  • 1CEA, Institute of Emerging Diseases and Innovative Therapies (iMETI), Research Division in Hematology and Immunology (SRHI), Saint-Louis Hospital, Paris, France; University Paris Diderot, Sorbonne Paris Cité, UMR E_5 Institut Universitaire d'Hematologie, Saint-Louis Hospital, Paris, France.

Advances in Immunology
|June 16, 2015
PubMed
Summary

Human Leukocyte Antigen-G (HLA-G) acts as an immune checkpoint, inhibiting immune cells. This molecule can be beneficial, promoting fetal-maternal tolerance and transplant acceptance, or detrimental, aiding tumor immune evasion.

Keywords:
CancerCheckpointGene regulationHLA-GImmune escapeImmune regulationInhibitory receptorsRegulatory cellsToleranceTransplantation

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Human Leukocyte Antigen-G (HLA-G) is crucial for fetal-maternal tolerance.
  • HLA-G mediates immune inhibition by binding to receptors on immune cells.
  • Its dual role in promoting tolerance or immune evasion is a key area of research.

Purpose of the Study:

  • To review the characterization, regulation, and functions of HLA-G.
  • To focus on the pathological relevance of HLA-G in transplantation and oncology.
  • To highlight HLA-G's role as an immune checkpoint molecule.

Main Methods:

  • Review of existing literature on HLA-G.
  • Analysis of HLA-G's interactions with immune cell receptors.
  • Examination of HLA-G's expression and function in pathological contexts.

Main Results:

  • HLA-G, whether membrane-bound or soluble, inhibits immune cell functions.
  • Expression of HLA-G can protect fetuses and transplants from immune rejection.
  • Tumor-expressed HLA-G can shield cancer cells from antitumor immunity.

Conclusions:

  • HLA-G functions as a critical immune checkpoint molecule.
  • Understanding HLA-G's opposing roles is vital for therapeutic strategies in transplantation and cancer.
  • Further research into HLA-G regulation and mechanisms is warranted.