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Fuhrmann F, Lischke T, Gross F, Scheel T, Bauer L, Kalim KW, Radbruch A, Herzel H, Hutloff A, Baumgrass R. Adequate immune response ensured by binary IL-2 and graded CD25 expression in a murine transfer model. eLife 2016; 5. [PMID: 28035902 PMCID: PMC5201416 DOI: 10.7554/elife.20616] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2016] [Accepted: 12/16/2016] [Indexed: 12/20/2022] Open
Abstract
The IL-2/IL-2Ralpha (CD25) axis is of central importance for the interplay of effector and regulatory T cells. Nevertheless, the question how different antigen loads are translated into appropriate IL-2 production to ensure adequate responses against pathogens remains largely unexplored. Here we find that at single cell level, IL-2 is binary (digital) and CD25 is graded expressed whereas at population level both parameters show graded expression correlating with the antigen amount. Combining in vivo data with a mathematical model we demonstrate that only this binary IL-2 expression ensures a wide linear antigen response range for Teff and Treg cells under real spatiotemporal conditions. Furthermore, at low antigen concentrations binary IL-2 expression safeguards by its spatial distribution selective STAT5 activation only of closely adjacent Treg cells regardless of their antigen specificity. These data show that the mode of IL-2 secretion is critical to tailor the adaptive immune response to the antigen amount. DOI:http://dx.doi.org/10.7554/eLife.20616.001
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Affiliation(s)
- Franziska Fuhrmann
- Robert Koch Institute, Berlin, Germany.,German Rheumatism Research Center Berlin (DRFZ), A Leibniz Institute, Berlin, Germany
| | - Timo Lischke
- German Rheumatism Research Center Berlin (DRFZ), A Leibniz Institute, Berlin, Germany
| | - Fridolin Gross
- Institute for Theoretical Biology, Charité University Medicine, Berlin, Germany
| | - Tobias Scheel
- German Rheumatism Research Center Berlin (DRFZ), A Leibniz Institute, Berlin, Germany
| | - Laura Bauer
- Robert Koch Institute, Berlin, Germany.,German Rheumatism Research Center Berlin (DRFZ), A Leibniz Institute, Berlin, Germany
| | - Khalid Wasim Kalim
- German Rheumatism Research Center Berlin (DRFZ), A Leibniz Institute, Berlin, Germany
| | - Andreas Radbruch
- German Rheumatism Research Center Berlin (DRFZ), A Leibniz Institute, Berlin, Germany.,Charité University Medicine, Berlin, Germany
| | - Hanspeter Herzel
- Institute for Theoretical Biology, Charité University Medicine, Berlin, Germany
| | - Andreas Hutloff
- Robert Koch Institute, Berlin, Germany.,German Rheumatism Research Center Berlin (DRFZ), A Leibniz Institute, Berlin, Germany
| | - Ria Baumgrass
- German Rheumatism Research Center Berlin (DRFZ), A Leibniz Institute, Berlin, Germany
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