Journal
JOURNAL OF EXPERIMENTAL MEDICINE
Volume 202, Issue 6, Pages 761-769Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1084/jem.20050193
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Funding
- NHLBI NIH HHS [R01HL061271, R01HL079142, R37 HL079142, R01 HL079142, R01 HL061271] Funding Source: Medline
- NIAAA NIH HHS [P60 AA009803, T32 AA007577, K08AA015163, P60AA009803, K08 AA015163, T32AA07577] Funding Source: Medline
- NIAID NIH HHS [R01AI051677, R01 AI051677] Funding Source: Medline
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Interleukin ( IL)-23 is a heterodimeric cytokine that shares the identical p40 subunit as IL-12 but exhibits a unique p19 subunit similar to IL-12 p35. IL-12/23 p40, interferon gamma ( IFN-gamma), and IL-17 are critical for host defense against Klebsiella pneumoniae. In vitro, K. pneumoniae pulsed dendritic cell culture supernatants elicit T cell IL-17 production in a IL-23-dependent manner. However, the importance of IL-23 during in vivo pulmonary challenge is unknown. We show that IL-12/23 p40-deficient mice are exquisitely sensitive to intrapulmonary K. pneumoniae inoculation and that IL-23 p19(-/-), IL-17R(-/-), and IL-12 p35(-/-) mice also show increased susceptibility to infection. p40(-/-) mice fail to generate pulmonary IFN-gamma, IL-17, or IL-17F responses to infection, whereas p35(-/-) mice show normal IL-17 and IL-17F induction but reduced IFN-gamma. Lung IL-17 and IL-17F production in p19(-/-) mice was dramatically reduced, and this strain showed substantial mortality from a sublethal dose of bacteria ( 10 3 CFU), despite normal IFN-gamma induction. Administration of IL-17 restored bacterial control in p19(-/-) mice and to a lesser degree in p40(-/-) mice, suggesting an additional host defense requirement for IFN-gamma in this strain. Together, these data demonstrate independent requirements for IL-12 and IL-23 in pulmonary host defense against K. pneumoniae, the former of which is required for IFN-gamma expression and the latter of which is required for IL-17 production.
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