In:
PLOS Pathogens, Public Library of Science (PLoS), Vol. 18, No. 6 ( 2022-6-24), p. e1010572-
Abstract:
Antiviral NK cell activity is regulated through the interaction of activating and inhibitory NK cell receptors with their ligands on infected cells. HLA class I molecules serve as ligands for most killer cell immunoglobulin-like receptors (KIRs), but no HLA class I ligands for the inhibitory NK cell receptor KIR2DL5 have been identified to date. Using a NK cell receptor/ligand screening approach, we observed no strong binding of KIR2DL5 to HLA class I or class II molecules, but confirmed that KIR2DL5 binds to the poliovirus receptor (PVR, CD155). Functional studies using primary human NK cells revealed a significantly decreased degranulation of KIR2DL5 + NK cells in response to CD155-expressing target cells. We subsequently investigated the role of KIR2DL5/CD155 interactions in HIV-1 infection, and showed that multiple HIV-1 strains significantly decreased CD155 expression levels on HIV-1-infected primary human CD4 + T cells via a Nef-dependent mechanism. Co-culture of NK cells with HIV-1-infected CD4 + T cells revealed enhanced anti-viral activity of KIR2DL5 + NK cells against wild-type versus Nef-deficient viruses, indicating that HIV-1-mediated downregulation of CD155 renders infected cells more susceptible to recognition by KIR2DL5 + NK cells. These data show that CD155 suppresses the antiviral activity of KIR2DL5 + NK cells and is downmodulated by HIV-1 Nef protein as potential trade-off counteracting activating NK cell ligands, demonstrating the ability of NK cells to counteract immune escape mechanisms employed by HIV-1.
Type of Medium:
Online Resource
ISSN:
1553-7374
DOI:
10.1371/journal.ppat.1010572
DOI:
10.1371/journal.ppat.1010572.g001
DOI:
10.1371/journal.ppat.1010572.g002
DOI:
10.1371/journal.ppat.1010572.g003
DOI:
10.1371/journal.ppat.1010572.g004
DOI:
10.1371/journal.ppat.1010572.g005
DOI:
10.1371/journal.ppat.1010572.t001
DOI:
10.1371/journal.ppat.1010572.s001
DOI:
10.1371/journal.ppat.1010572.s002
DOI:
10.1371/journal.ppat.1010572.s003
DOI:
10.1371/journal.ppat.1010572.s004
Language:
English
Publisher:
Public Library of Science (PLoS)
Publication Date:
2022
detail.hit.zdb_id:
2205412-1
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