The emergence of pathogenic TNF/iNOS producing dendritic cells (Tip-DCs) in a malaria model of acute respiratory distress syndrome (ARDS) is dependent on CCR4

Mucosal Immunol. 2019 Mar;12(2):312-322. doi: 10.1038/s41385-018-0093-5. Epub 2018 Oct 18.

Abstract

Malaria-associated acute respiratory distress syndrome (MA-ARDS) and acute lung injury (ALI) are complications that cause lung damage and often leads to death. The MA-ARDS/ALI is associated with a Type 1 inflammatory response mediated by T lymphocytes and IFN-γ. Here, we used the Plasmodium berghei NK65 (PbN)-induced MA-ALI/ARDS model that resembles human disease and confirmed that lung CD4+ and CD8+ T cells predominantly expressed Tbet and IFN-γ. Surprisingly, we found that development of MA-ALI/ARDS was dependent on functional CCR4, known to mediate the recruitment of Th2 lymphocytes and regulatory T cells. However, in this Type 1 inflammation-ARDS model, CCR4 was not involved in the recruitment of T lymphocytes, but was required for the emergence of TNF-α/iNOS producing dendritic cells (Tip-DCs) in the lungs. In contrast, recruitment of Tip-DCs and development of MA-ALI/ARDS were not altered in CCR2-/- mice. Importantly, we showed that NOS2-/- mice are resistant to PbN-induced lung damage, indicating that reactive nitrogen species produced by Tip-DCs play an essential role in inducing MA-ARDS/ALI. Lastly, our experiments suggest that production of IFN-γ primarily by CD8+ T cells is required for inducing Tip-DCs differentiation in the lungs and the development of MA-ALI/ARDS model.

Publication types

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

MeSH terms

  • Animals
  • CD8-Positive T-Lymphocytes / immunology*
  • Cell Differentiation
  • Cells, Cultured
  • Dendritic Cells / immunology*
  • Disease Models, Animal
  • Humans
  • Interferon-gamma / genetics
  • Interferon-gamma / metabolism
  • Malaria / immunology*
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Nitric Oxide Synthase Type II / genetics
  • Nitric Oxide Synthase Type II / metabolism*
  • Plasmodium berghei / physiology*
  • Receptors, CCR4 / genetics
  • Receptors, CCR4 / metabolism*
  • Respiratory Distress Syndrome / immunology*
  • Th2 Cells / immunology*
  • Tumor Necrosis Factor-alpha / metabolism

Substances

  • Ccr4 protein, mouse
  • Receptors, CCR4
  • Tumor Necrosis Factor-alpha
  • Interferon-gamma
  • Nitric Oxide Synthase Type II
  • Nos2 protein, mouse