Mechanism of human natural killer cell activation by haemophilus ducreyi

Wei Li, Diane M. Janowicz, Kate R. Fortney, Barry P. Katz, Stanley M. Spinola

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The role of natural killer (NK) cells in the host response to Haemophilus ducreyi infection is unclear. In pustules obtained from infected human volunteers, there was an enrichment of CD56bright NK cells bearing the activation markers CD69 and HLA-DR, compared with peripheral blood. To study the mechanism by which H. ducreyi activated NK cells, we used peripheral blood mononuclear cells from uninfected volunteers. H. ducreyi activated NK cells only in the presence of antigen-presenting cells. H. ducreyi-infected monocytes and monocyte-derived macrophages activated NK cells in a contact- and interleukin-18 (IL-18)-dependent manner, whereas monocyte-derived dendritic cells induced NK activation through soluble IL-12. More lesionai NK cells than peripheral blood NK cells produced IFN-γ in response to IL-12 and IL-18. We conclude that NK cells are recruited to experimental lesions and likely are activated by infected macrophages and dendritic cells. IFN-γ produced by lesional NK cells may facilitate phagocytosis of H. ducreyi.

Original languageEnglish (US)
Pages (from-to)590-598
Number of pages9
JournalJournal of Infectious Diseases
Volume200
Issue number4
DOIs
StatePublished - Aug 15 2009

ASJC Scopus subject areas

  • Immunology and Allergy
  • Infectious Diseases

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