Special Organization of the HLA-G Protein on the Cell Surface

Tsufit Gonen-Gross, Roi Gazit, Hagit Achdout, Jacob Hanna, Sa'ar Mizrahi, Gal Markel, Václav Hořejší, Ofer Mandelboim

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The human leukocyte antigen G (HLA-G) molecule possesses unique properties such as low polymorphism and restricted distribution mainly to the extravillous cytotrophoblast (EVT) cells. The EVT cells vigorously penetrate into the maternal decidual tissues and are found in contact with maternal lymphocytes, mainly with natural killer (NK) cells. The HLA-G molecule inhibits the effector function of maternal NK cells via interaction with the KIR2DL4 and the ILT-2 inhibitory NK receptors. Previously, we have demonstrated that complexes of the HLA-G protein are expressed on the cell surface. We reported that these complexes are formed due to the presence of two unique cysteine residues located at positions 42 and 147. Finally, we demonstrated that efficient binding and function of ILT-2 is dependent on the presence of HLA-G complexes on the cell surface. Here we expand the significance of these observations by revealing that complexes of HLA-G are present on the cell surface using different assays and cell lines and further demonstrate that complexes of HLA-G might be present in a soluble form after interaction with ILT-2. Therefore, the HLA-G molecule has developed a special mechanism to increase the avidity of NK receptors to the HLA-G molecule, which provides better protection for the fetus from maternal NK rejection.

Original languageEnglish
Pages (from-to)1011-1016
Number of pages6
JournalHuman Immunology
Volume64
Issue number11
DOIs
StatePublished - 1 Jan 2003
Externally publishedYes

Keywords

  • Complexes
  • Cysteine
  • HLA-G
  • ILT-2
  • NK

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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