Interference with intraepithelial TNF-α signaling inhibits CD8 + T-cell-mediated lung injury in influenza infection

Academic Article


  • CD8+ T-cell-mediated pulmonary immunopathology in respiratory virus infection is mediated in large part by antigen-specific TNF-α expression by antiviral effector T cells, which results in epithelial chemokine expression and inflammatory infiltration of the lung. To further define the signaling events leading to lung epithelial chemokine production in response to CD8+ T-cell antigen recognition, we expressed the adenoviral 14.7K protein, a putative inhibitor of TNF-α signaling, in the distal lung epithelium, and analyzed the functional consequences. Distal airway epithelial expression of 14.7K resulted in a significant reduction in lung injury resulting from severe influenza pneumonia. In vitro analysis demonstrated a significant reduction in the expression of an important mediator of injury, CCL2, in response to CD8+ T-cell recognition, or to TNF-α. The inhibitory effect of 14.7K on CCL2 expression resulted from attenuation of NF-κB activity, which was independent of Iκ-Bα degradation or nuclear translocation of the p65 subunit. Furthermore, epithelial 14.7K expression inhibited serine phosphorylation of Akt, GSK-3β, and the p65 subunit of NF-κB, as well as recruitment of NF-κB for DNA binding in vivo. These results provide insight into the mechanism of 14.7K inhibition of NF-κB activity, as well as further elucidate the mechanisms involved in the induction of T-cell-mediated immunopathology in respiratory virus infection. © 2010, Mary Ann Liebert, Inc.
  • Authors

    Published In

  • Viral Immunology  Journal
  • Digital Object Identifier (doi)

    Author List

  • Srikiatkhachorn A; Chintapalli J; Liu J; Jamaluddin M; Harrod KS; Whitsett JA; Enelow RI; Ramana CV
  • Start Page

  • 639
  • End Page

  • 645
  • Volume

  • 23
  • Issue

  • 6