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HLA-G and inflammatory diseases.

Olavio R Baricordi1, Marina Stignani, Loredana Melchiorri

  • 1Laboratory of Immunogenetics, Section of Medical Genetics, Department of Experimental and Diagnostic Medicine, University of Ferrara, Via Luigi Borsari 46, Ferrara, Italy. bri@unife.it

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Human Leukocyte Antigen-G (HLA-G) molecules play a crucial role in immune tolerance, particularly in pregnancy and transplantation. Their expression in autoimmune and allergic diseases may influence inflammation, with genetic variations impacting protein production.

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Area of Science:

  • Immunology
  • Genetics

Background:

  • Human Leukocyte Antigen-G (HLA-G) are non-classical HLA-class I molecules with low polymorphism and limited tissue distribution.
  • HLA-G is crucial for feto-maternal tolerance and is implicated in autoimmune diseases, infections, cancer, and transplantation.
  • Both membrane-bound and soluble HLA-G isoforms exhibit tolerogenic functions, modulating innate and adaptive immune responses.

Purpose of the Study:

  • To review the literature on HLA-G expression in autoimmune and allergic diseases.
  • To explore the potential role of HLA-G in counteracting inflammation within these conditions.

Main Methods:

  • Literature review of studies investigating HLA-G expression.
  • Analysis of the functional implications of HLA-G in autoimmune and allergic diseases.
  • Examination of HLA-G gene polymorphisms, specifically the 14bp insertion/deletion in exon 8.

Main Results:

  • Variable HLA-G expression is observed in autoimmune and allergic diseases.
  • HLA-G influences cytotoxicity of NK and CD8+ T cells, CD4+ T cell functions, and dendritic cell maturation.
  • The 14bp insertion polymorphism in HLA-G exon 8 is linked to unstable mRNA and reduced soluble HLA-G (sHLA-G) production, potentially affecting anti-inflammatory capacity.

Conclusions:

  • HLA-G molecules possess significant immunomodulatory and tolerogenic functions.
  • Genetic variations in HLA-G, such as the 14bp polymorphism, may influence disease susceptibility and progression by altering anti-inflammatory responses.
  • Further research into HLA-G's role in autoimmune and allergic diseases could reveal therapeutic targets.