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CD25-Targeted IL-2 Signals Promote Improved Outcomes of Influenza Infection and Boost Memory CD4 T Cell Formation.

J Immunol. 2020 Jun 15;204(12):3307-3314. Epub 2020 May 06
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摘要


IL-2 is a pleotropic cytokine with potent pro- and anti-inflammatory effects. These divergent impacts can be directed in vivo by forming complexes of IL-2 and anti-IL-2 mAbs (IL-2C) to target IL-2 to distinct subsets of cells based on their expression of subunits of the IL-2R. In this study, we show that treatment of mice with a prototypical anti-inflammatory IL-2C, JES6-1-IL-2C, best known to induce CD25+ regulatory CD4 T cell expansion, surprisingly causes robust induction of a suite of inflammatory factors. However, treating mice infected with influenza A virus with this IL-2C reduces lung immunopathology. We compare the spectrum of inflammatory proteins upregulated by pro- and anti-inflammatory IL-2C treatment and uncover a pattern of expression that reveals potentially beneficial versus detrimental aspects of the influenza-associated cytokine storm. Moreover, we show that anti-inflammatory IL-2C can deliver survival signals to CD4 T cells responding to influenza A virus that improve their memory fitness, indicating a novel application of IL-2 to boost pathogen-specific T cell memory while simultaneously reducing immunopathology.

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