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Autoregulation of Th1-mediated inflammation by twist1 Uwe Niesner, Inka Albrecht, Marko Janke, Cornelia Doebis, Christoph Loddenkemper, Maria H. Lexberg,

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Presentation on theme: "Autoregulation of Th1-mediated inflammation by twist1 Uwe Niesner, Inka Albrecht, Marko Janke, Cornelia Doebis, Christoph Loddenkemper, Maria H. Lexberg,"— Presentation transcript:

1 Autoregulation of Th1-mediated inflammation by twist1 Uwe Niesner, Inka Albrecht, Marko Janke, Cornelia Doebis, Christoph Loddenkemper, Maria H. Lexberg, Katharina Eulenburg, Stephan Kreher, Juliana Koeck, Ria Baumgrass, Kerstin Bonhagen, Thomas Kamradt, Philipp Enghard, Jens Y. Humrich, Sascha Rutz, Ulf Schulze-Topphoff, Orhan Aktas, Sina Bartfeld, Helena Radbruch, Ahmed N. Hegazy, Max Löhning, Daniel C. Baumgart, Rainer Duchmann, Martin Rudwaleit, Thomas Häupl, Inna Gitelman, Veit Krenn, Joachim Gruen, Jochen Sieper, Martin Zeitz, Bertram Wiedenmann, Frauke Zipp, Alf Hamann, Michal Janitz, Alexander Scheffold, Gerd R. Burmester, Hyun D. Chang, and Andreas Radbruch Journal of Experimental Medicine Volume 205(8): August 2, 2008 © 2008 Niesner et.al.

2 Th cell balance naive T cell TGFβ IL-1/IL-6/IL-23 IFN γ IL-17A-F IL-22 IL-4 IL-10 IL-13 IL-5 Activation STAT4 Production IFN γ Activation Tbet Activation RORC2 Activation STAT6 Activation GATA3 IL-4 IL-12 Th1 Th17 Th2

3 Twist1: a basic helix-loop-helix transcription factor basic helix-loop-helix transcription factor binds to a consensus sequence called e-box: CANNTG

4 Transcriptional regulation of bHLH transcription factors

5 Repeated Th1 stimulation naive CD4 + CD62L + T cells from DO11.10 mice (carrying a TCR specific for Ovalbumin) splenic APC Ovalbumin IL-12 anti-IL-4 6d restimulation gene array fold upregulation of twist1 expression in 4 times restimulated Th1 cells PMA/iono CD3/CD28 quantitative real-time PCR

6 Twist1 expression is induced in Th1, but not Th2 or Th17 cells

7 Twist1 induction requires IL-12 signaling via STAT4, but not IFN-γ or T- bet

8 Signaling through NFAT and NF-κB is required for induction of twist1 expression PDTC blocksNF-κB BTP blocks NFAT CSA blocks IL-2 signaling

9 Ex vivo isolated memory Th cells express twist1

10 Generation of Th1 cells constitutively expressing twist1 d0: splenic DO11.10 cells activated in vitro d2: infection with twist1 encoding or control retrovirus d5: sort of GFP +

11 Genes differentially expressed upon ectopic twist1 overexpression

12 Twist1 suppresses the expression of effector cytokines

13 NF-κB driven luciferase reporter d0: splenic DO11.10 cells activated in vitro d2: infection with twist1 or I-κB α M encoding retrovirus d3: nucleoporation with a mixture of luciferase encoding plasmids d5: sort of GFP +

14 Inhibition of NF-κB–mediated signaling by twist1 is promoter-specific

15 DTH model 6d-old-Th1 cells overexpressing twist1 injected i.v. in BALB/c 1d later OVA + IFA injection in footpad messure of swelling of the footpad

16 Ectopic twist1 overexpression controls DTH

17 Twist1 knockdown increases inflammatory response in murine arthritis

18 Conclusions repeatedly stimulated Th1 cells express twist1 twist1 expression is NF-κB, NFAT and STAT4 dependent twist1 is expressed in humans and mice –in Th1 effector memory cells –on CD4 + T cells of inflammed tissue Tbet is not needed for twist1 expression twist1 binds to e-boxes in the regulatory regions of specific target genes twist1 reduces activation-induced expression IL- 2, IFN- γ, TNF- α on the protein level and theirby dampening an inflammation


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