IL-17 and mucosal host defense

  • Shabaana A. Khader
  • Jay K. Kolls
Part of the Progress in Inflammation Research book series (PIR)


IL-17, a cytokine initially cloned from memory CD+ T cells is produced by Th17 cells, a new lineage of T cells that are controlled by the transcription factor RORγt, as well as γ δ T cells and NK T cells. IL-17A and IL-17F use both IL-17RA and IL-17RC for signaling. IL-17RA is widely expressed in myeloid cells, fibroblasts, and epithelium. IL-17RA signaling is critical for mucosal immunity in the lung against extracellular bacterial infection through the regulation of granulopoietic growth factors and CXC chemokines required for neutrophil recruitment, as well as anti-microbial protein expression in epithelium. IL-17RA has a limited role in controlling the primary response to intracellular pathogens such as Listeria monocytogenes or Mycobacterium tuberculosis, which require Th1 immunity. However, in the setting of vaccine-induced immunity, IL-17 regulates the recruitment of Th1 cells and is required for optimal vaccine responses for both extracellular and intracellular pathogens.


Human Bronchial Epithelial Cell Mycobacterium Tuberculosis Infection Whole Cell Pertussis Herpesvirus Saimiri Neutrophil Emigration 


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Copyright information

© Birkhäuser Verlag Basel/Switzerland 2009

Authors and Affiliations

  • Shabaana A. Khader
    • 1
  • Jay K. Kolls
    • 1
  1. 1.Division of Pulmonology, Department of PediatricsChildren’s Hospital of Pittsburgh and the University of PittsburghPittsburghUSA

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