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- W4313382134 abstract "Abstract HLA-F is expressed as a protein independent of bound peptide or β2-microglobulin and surface expression is upregulated upon activation in dendritic cells, monocytes and most lymphocyte subsets. MHC class I (MHCI) is also expressed on proliferating lymphoid cells as open conformers (OCs), in addition to the ubiquitously expressed complexed form. Previous studies showed that HLA-F binds most MHCI proteins as open conformers without peptide but not as peptide bound complex. These studies were extended to show both HLA-F and MHCI OC are ligands for a subset of killer Ig-like receptors (KIRs), defining a new paradigm for MHCI function in the innate and acquired immune responses. The HLA-F/MHCI physical interaction was further implicated in the function of HLA-F and MHCI OCs in a general mode of exogenous MHCI antigen uptake and antigen presentation by activated immune cells that differs from the canonical MHCI endogenous antigen presentation. We are currently testing the hypothesis that antigen entry is governed by a synergy between specific structural characteristics of the exogenous antigen and the MHC-I allele types of target cells. New evidence is presented using HIV-1 p24 gag derived long polypeptides suggesting a requirement for HLA class I peptide epitope specificity in antigen uptake, upstream of antigen presentation, which subsequently can be presented by either or both of MHCI and MHCII. These experiments suggested that the physical proximity of HIV-1 class I and class II peptide epitopes within a p24 polypeptide can influence antigen presentation of epitopes through either MHCI or MHCII or both. A goal is to manipulate these features in designing effective immunogens for directed stimulation of antigen-specific host responses." @default.
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- W4313382134 date "2017-05-01" @default.
- W4313382134 modified "2023-10-02" @default.
- W4313382134 title "HLA-F and MHC open conformers cooperate in antigen presentation during the inflammatory response." @default.
- W4313382134 doi "https://doi.org/10.4049/jimmunol.198.supp.146.13" @default.
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