Local blockade of epithelial PDL-1 in the airways enhances T cell function and viral clearance during influenza virus infection

J Virol. 2013 Dec;87(23):12916-24. doi: 10.1128/JVI.02423-13. Epub 2013 Sep 25.

Abstract

In order to maintain the gas exchange function of the lung following influenza virus infection, a delicate orchestration of positive and negative regulatory pathways must be maintained to attain viral eradication while minimizing local inflammation. The programmed death receptor 1 ligand/programmed death receptor 1 (PDL-1/PD-1) pathway plays an important immunoregulatory role, particularly in the context of T cell function. Here, we have shown that influenza virus infection of primary airway epithelial cells strongly enhances PDL-1 expression and does so in an alpha interferon receptor (IFNAR) signaling-dependent manner. PD-1 is expressed primarily on effector T cells in the lung, compared to effector memory and central memory cells, and shortly after influenza virus infection, an increased number of PD-1(+) T cells are recruited to the airways. Using in vitro cocultures of airway epithelial cells and T cells and in vivo models of influenza virus infection, we have demonstrated that blockade of airway epithelial PDL-1 improves CD8 T cell function, defined by increased production of gamma interferon (IFN-γ) and granzyme B and expression of CD107ab. Furthermore, PDL-1 blockade in the airways served to accelerate influenza virus clearance and enhance infection recovery. Our findings suggest that local manipulation of the PDL-1/PD-1 axis in the airways may represent a therapeutic alternative during acute influenza virus infection.

Publication types

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

MeSH terms

  • Animals
  • B7-H1 Antigen / genetics
  • B7-H1 Antigen / immunology*
  • Cells, Cultured
  • Epithelial Cells / immunology*
  • Epithelial Cells / virology
  • Female
  • Humans
  • Influenza A virus / immunology
  • Influenza A virus / physiology*
  • Influenza, Human / immunology*
  • Influenza, Human / virology
  • Interferon-gamma / immunology
  • Lung / immunology
  • Lung / virology
  • Male
  • Mice, Inbred BALB C
  • Mice, Inbred C57BL
  • T-Lymphocytes / immunology*
  • Trachea / cytology*
  • Trachea / immunology
  • Trachea / virology

Substances

  • B7-H1 Antigen
  • Cd274 protein, mouse
  • Interferon-gamma