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Research Article
Recipient Toll-like receptors contribute to chronic graft dysfunction by both MyD88- and TRIF-dependent signaling
Shijun Wang, Christoph Schmaderer, Eva Kiss, Claudia Schmidt, Mahnaz Bonrouhi, Stefan Porubsky, Norbert Gretz, Liliana Schaefer, Carsten J. Kirschning, Zoran V. Popovic, Hermann-Josef Gröne
Disease Models & Mechanisms 2010 3: 92-103; doi: 10.1242/dmm.003533
Shijun Wang
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Christoph Schmaderer
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Eva Kiss
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Claudia Schmidt
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Mahnaz Bonrouhi
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Stefan Porubsky
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Norbert Gretz
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Liliana Schaefer
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Carsten J. Kirschning
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Zoran V. Popovic
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Hermann-Josef Gröne
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  • For correspondence: h.-j.groene@dkfz.de
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SUMMARY

Toll-like receptors (TLRs) recognize specific molecular patterns derived from microbial components (exogenous ligands) or stressed cells (endogenous ligands). Stimulation of these receptors leads to a pronounced inflammatory response in a variety of acute animal models. Chronic allograft dysfunction (CAD) was regarded as a candidate disease to test whether TLRs influence chronic fibrosing inflammation. Potential endogenous renal TLR ligands, specifically for TLR2 and TLR4, have now been detected by a significant upregulation of glucose regulated protein (GRP)-94, fibrinogen, heat shock protein (HSP)-60, HSP-70, biglycan (Bgn) and high-mobility group box chromosomal protein 1 (HMGB1) in the acute and chronic transplant setting. In a genetic approach to define the contribution of TLR2 and TLR4, and their adaptor proteins MyD88 and TRIF [Toll/interleukin (IL)-1 receptor domain-containing adaptor-protein inducing interferon β], to CAD, kidney transplantation of TLR wild-type grafts to recipients who were deficient in TLR2, TLR4, TLR2/4, MyD88 and TRIF was performed. TLR and adaptor protein deficiencies significantly improved the excretory function of chronic kidney grafts by between 65% and 290%, and histopathologic signs of chronic allograft damage were significantly ameliorated. T cells, dendritic cells (DCs) and foremost macrophages were reduced in grafts by up to 4.5-fold. The intragraft concentrations of IL-6, IL-10, monocyte chemotactic protein-1 (MCP-1) and IL-12p70 were significantly lower. TLR-, MyD88- and TRIF-deficient recipients showed a significant reduction in fibrosis. α-smooth muscle actin (α-SMA)-positive cells were decreased by up to ninefold, and collagen I and III were reduced by up to twofold. These findings highlight the functional relevance of TLRs and their two major signaling pathways in graft-infiltrating mononuclear cells in the pathophysiology of CAD. A TLR signaling blockade may be a therapeutic option for the prevention of CAD.

Footnotes

  • ↵* These authors contributed equally to this work

  • COMPETING INTERESTS

    The authors declare no competing financial interests.

  • AUTHOR CONTRIBUTIONS

    H.-J.G., S.W. and Ch.S. conceived and designed the experiments; S.W., C.L.S., M.B., S.P., Z.V.P., Ch.S. and L.S. performed the experiments; Ch.S., S.W., Z.V.P., E.K., H.-J.G. analyzed the data; N.G. and C.J.K. contributed reagents, animals and analysis tools; and Ch.S., S.W. and H.-J.G. wrote the paper.

  • SUPPLEMENTARY MATERIAL

    Supplementary material for this article is available at http://dmm.biologists.org/lookup/suppl/doi:10.1242/dmm.003533/-/DC1

  • Received April 17, 2009.
  • Accepted August 3, 2009.
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Research Article
Recipient Toll-like receptors contribute to chronic graft dysfunction by both MyD88- and TRIF-dependent signaling
Shijun Wang, Christoph Schmaderer, Eva Kiss, Claudia Schmidt, Mahnaz Bonrouhi, Stefan Porubsky, Norbert Gretz, Liliana Schaefer, Carsten J. Kirschning, Zoran V. Popovic, Hermann-Josef Gröne
Disease Models & Mechanisms 2010 3: 92-103; doi: 10.1242/dmm.003533
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Research Article
Recipient Toll-like receptors contribute to chronic graft dysfunction by both MyD88- and TRIF-dependent signaling
Shijun Wang, Christoph Schmaderer, Eva Kiss, Claudia Schmidt, Mahnaz Bonrouhi, Stefan Porubsky, Norbert Gretz, Liliana Schaefer, Carsten J. Kirschning, Zoran V. Popovic, Hermann-Josef Gröne
Disease Models & Mechanisms 2010 3: 92-103; doi: 10.1242/dmm.003533

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