HLA-G mediated immune regulation is impaired by a single amino acid exchange in the alpha 2 domain.

HLA-G mediated immune regulation is impaired by a single amino acid exchange in the alpha 2 domain. Hum Immunol. 2018 Mar 29;: Authors: Celik AA, Simper GS, Huyton T, Blasczyk R, Bade-Döding C Abstract The trade-off from HLA class I expression to HLA-G expression support the immune evasion of malignant cells. The essential role of the virtually invariant HLA-G in immune tolerance, tumor immunology and its expression frequency in immune privileged tissues is known; however the specific importance of allelic subtypes in immune responses is still not well understood. HLA-G∗01:01, ∗01:03 and ∗01:04 are the most prevalent allelic variants differing at residues 31 and 110, respectively. In cytotoxicity assays applying K562 cells transduced with the HLA-G variants as targets and NK cells as effectors the differential protective potential of HLA-G variants was analyzed. Their peptide profiles were determined utilizing soluble HLA technology. An increased protective potential of HLA-G∗01:04 could be observed. All variants exhibit a unique peptide repertoire with marginal overlap, while G∗01:04 differs in its peptide anchor profile substantially. The functional differences between HLA-G subtypes could be explained by the constraint of the bound peptides, modifying the pHLA-G accessible surface. For the first time a contribution of amino acid alterations within the HLA-G heavy chain for peptide selection and NK cell recognition could...
Source: Human Immunology - Category: Allergy & Immunology Authors: Tags: Hum Immunol Source Type: research