Local modulation of antigen-presenting cell development after resolution of pneumonia induces long-term susceptibility to secondary infections
Publication Year 2017-07-18, Volume 47, Issue #1, Page 135-147 e5
Journal Title
Publication Type
Journal Article
Lung infections cause prolonged immune alterations and elevated susceptibility to secondary pneumonia. We found that, after resolution of primary viral or bacterial pneumonia, dendritic cells (DC), and macrophages exhibited poor antigen-presentation capacity and secretion of immunogenic cytokines. Development of these "paralyzed" DCs and macrophages depended on the immunosuppressive microenvironment established upon resolution of primary infection, which involved regulatory T (Treg) cells and the cytokine TGF-beta. Paralyzed DCs secreted TGF-beta and induced local Treg cell accumulation. They also expressed lower amounts of IRF4, a transcription factor associated with increased antigen-presentation capacity, and higher amounts of Blimp1, a transcription factor associated with tolerogenic functions, than DCs present during primary infection. Blimp1 expression in DC of humans suffering sepsis or trauma correlated with severity and complicated outcomes. Our findings describe mechanisms underlying sepsis- and trauma-induced immunosuppression, reveal prognostic markers of susceptibility to secondary infections and identify potential targets for therapeutic intervention.
Cell Press
WEHI Research Division(s)
Molecular Immunology
PubMed ID
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Creation Date: 2017-08-30 02:22:39
Last Modified: 2017-09-04 03:32:58
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