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Nintedanib inhibits fibroblast activation and ameliorates fibrosis in preclinical models of systemic sclerosis
  1. Jingang Huang1,
  2. Christian Beyer1,
  3. Katrin Palumbo-Zerr1,
  4. Yun Zhang1,
  5. Andreas Ramming1,
  6. Alfiya Distler1,
  7. Kolja Gelse2,
  8. Oliver Distler3,
  9. Georg Schett1,
  10. Lutz Wollin4,
  11. Jörg H W Distler1
  1. 1Department of Internal Medicine 3 and Institute for Clinical Immunology, University of Erlangen-Nuremberg, Erlangen, Germany
  2. 2Department of Trauma Surgery, University of Erlangen-Nuremberg, Erlangen, Germany
  3. 3Center of Experimental Rheumatology, Research of Systemic Autoimmune Diseases, University Hospital Zurich, Zurich, Switzerland
  4. 4Boehringer-Ingelheim Pharma, Div. Research Germany, Biberach, Germany
  1. Correspondence to Professor Jörg H W Distler, Department of Medicine 3 and Institute for Clinical Immunology, University of Erlangen-Nuremberg, Ulmenweg 18, Erlangen D-91054, Germany; joerg.distler{at}uk-erlangen.de

Abstract

Background Nintedanib is a tyrosine kinase inhibitor that has recently been shown to slow disease progression in idiopathic pulmonary fibrosis in two replicate phase III clinical trials. The aim of this study was to analyse the antifibrotic effects of nintedanib in preclinical models of systemic sclerosis (SSc) and to provide a scientific background for clinical trials in SSc.

Methods The effects of nintedanib on migration, proliferation, myofibroblast differentiation and release of extracellular matrix of dermal fibroblasts were analysed by microtitre tetrazolium and scratch assays, stress fibre staining, qPCR and SirCol assays. The antifibrotic effects of nintedanib were evaluated in bleomycin-induced skin fibrosis, in a murine sclerodermatous chronic graft-versus-host disease model and in tight-skin-1 mice.

Results Nintedanib dose-dependently reduced platelet-derived growth factor-induced and transforming growth factor-β-induced proliferation and migration as well as myofibroblast differentiation and collagen release of dermal fibroblasts from patients with and healthy individuals. Nintedanib also inhibited the endogenous activation of SSc fibroblasts. Nintedanib prevented bleomycin-induced skin fibrosis in a dose-dependent manner and was also effective in the treatment of established fibrosis. Moreover, treatment with nintedanib ameliorated fibrosis in the chronic graft-versus-host disease model and in tight-skin-1 mice in well-tolerated doses.

Conclusions We demonstrate that nintedanib effectively inhibits the endogenous as well as cytokine-induced activation of SSc fibroblasts and exerts potent antifibrotic effects in different complementary mouse models of SSc. These data have direct translational implications for clinical trials with nintedanib in SSc.

  • Fibroblasts
  • Treatment
  • Systemic Sclerosis

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