Elevated HLA-A expression impairs HIV control through inhibition of NKG2A-expressing cells

Science. 2018 Jan 5;359(6371):86-90. doi: 10.1126/science.aam8825. Epub 2018 Jan 4.

Abstract

The highly polymorphic human leukocyte antigen (HLA) locus encodes cell surface proteins that are critical for immunity. HLA-A expression levels vary in an allele-dependent manner, diversifying allele-specific effects beyond peptide-binding preference. Analysis of 9763 HIV-infected individuals from 21 cohorts shows that higher HLA-A levels confer poorer control of HIV. Elevated HLA-A expression provides enhanced levels of an HLA-A-derived signal peptide that specifically binds and determines expression levels of HLA-E, the ligand for the inhibitory NKG2A natural killer (NK) cell receptor. HLA-B haplotypes that favor NKG2A-mediated NK cell licensing (i.e., education) exacerbate the deleterious effect of high HLA-A on HIV control, consistent with NKG2A-mediated inhibition impairing NK cell clearance of HIV-infected targets. Therapeutic blockade of HLA-E:NKG2A interaction may yield benefit in HIV disease.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alleles
  • CD4 Lymphocyte Count
  • Cohort Studies
  • HIV / immunology*
  • HIV Infections / drug therapy
  • HIV Infections / genetics
  • HIV Infections / immunology*
  • HLA Antigens / genetics
  • HLA Antigens / metabolism*
  • Humans
  • Killer Cells, Natural / immunology*
  • Ligands
  • NK Cell Lectin-Like Receptor Subfamily C / antagonists & inhibitors
  • NK Cell Lectin-Like Receptor Subfamily C / genetics
  • NK Cell Lectin-Like Receptor Subfamily C / metabolism*
  • Protein Sorting Signals
  • Viremia / immunology

Substances

  • HLA Antigens
  • KLRC1 protein, human
  • Ligands
  • NK Cell Lectin-Like Receptor Subfamily C
  • Protein Sorting Signals