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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, N.I.H., INTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
HIV-1 Control by NK Cells via Reduced Interaction between KIR2DL2 and HLA-C ∗ 12:02/C ∗ 14:03.
Cell Reports 2016 November 23
Natural killer (NK) cells control viral infection in part through the interaction between killer cell immunoglobulin-like receptors (KIRs) and their human leukocyte antigen (HLA) ligands. We investigated 504 anti-retroviral (ART)-free Japanese patients chronically infected with HIV-1 and identified two KIR/HLA combinations, KIR2DL2/HLA-C∗ 12:02 and KIR2DL2/HLA-C∗ 14:03, that impact suppression of HIV-1 replication. KIR2DL2+ NK cells suppressed viral replication in HLA-C∗ 14:03+ or HLA-C∗ 12:02+ cells to a significantly greater extent than did KIR2DL2- NK cells in vitro. Functional analysis showed that the binding between HIV-1-derived peptide and HLA-C∗ 14:03 or HLA-C∗ 12:02 influenced KIR2DL2+ NK cell activity through reduced expression of the peptide-HLA (pHLA) complex on the cell surface (i.e., reduced KIR2DL2 ligand expression), rather than through reduced binding affinity of KIR2DL2 to the respective pHLA complexes. Thus, KIR2DL2/HLA-C∗ 12:02 and KIR2DL2/HLA-C∗ 14:03 compound genotypes have protective effects on control of HIV-1 through a mechanism involving KIR2DL2-mediated NK cell recognition of virus-infected cells, providing additional understanding of NK cells in HIV-1 infection.
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