IL-23 and IL-17 in the establishment of protective pulmonary CD4+ T cell responses after vaccination and during Mycobacterium tuberculosis challenge

Academic Article


  • Interferon-γ is key in limiting Mycobacterium tuberculosis infection. Here we show that vaccination triggered an accelerated interferon-γ response by CD4+ T cells in the lung during subsequent M. tuberculosis infection. Interleukin 23 (IL-23) was essential for the accelerated response, for early cessation of bacterial growth and for establishment of an IL-17-producing CD4+ T cell population in the lung. The recall response of the IL-17-producing CD4+ T cell population occurred concurrently with expression of the chemokines CXCL9, CXCL10 and CXCL11. Depletion of IL-17 during challenge reduced the chemokine expression and accumulation of CD4+ T cells producing interferon-gamma; in the lung. We propose that vaccination induces IL-17-producing CD4+ T cells that populate the lung and, after challenge, trigger the production of chemokines that recruit CD4+ T cells producing interferon-γ, which ultimately restrict bacterial growth.
  • Published In

  • Nature Immunology  Journal
  • Digital Object Identifier (doi)

    Pubmed Id

  • 387500
  • Author List

  • Khader SA; Bell GK; Pearl JE; Fountain JJ; Rangel-Moreno J; Cilley GE; Shen F; Eaton SM; Gaffen SL; Swain SL
  • Start Page

  • 369
  • End Page

  • 377
  • Volume

  • 8
  • Issue

  • 4