Heat shock protein 70 protects against bleomycin-induced pulmonary fibrosis in mice

Biochem Pharmacol. 2010 Sep 15;80(6):920-31. doi: 10.1016/j.bcp.2010.05.025. Epub 2010 Jun 1.


Idiopathic pulmonary fibrosis (IPF) involves infiltration of leucocytes, pulmonary injury, fibrosis and resulting pulmonary dysfunction. Myofibroblasts and transforming growth factor (TGF)-beta1 have been suggested to play a major role in the pathology and the myofibroblasts are derived from both lung epithelial cells through epithelial-mesenchymal transition (EMT) and activation of lung fibroblasts. Heat shock protein 70 (HSP70) confers protection against various stressors and has the anti-inflammatory activity. In this study, we examined the effect of expression of HSP70 on bleomycin-induced pulmonary fibrosis in mice, a tentative animal model of IPF. Bleomycin-induced pulmonary injury and inflammatory response were ameliorated in transgenic mice overexpressing HSP70 compared to wild-type mice, even though bleomycin-induced pulmonary fibrosis and dysfunction were also suppressed in the transgenic mice. The production of TGF-beta1 and expression of pro-inflammatory cytokines was lower in cells from the transgenic mice than wild-type mice after the administration of bleomycin. In vitro, the suppression of HSP70 expression stimulated TGF-beta1-induced EMT-like phenotypes of epithelial cells but did not affect the TGF-beta1-dependent activation of fibroblasts. Orally administered geranylgeranylacetone (GGA), a clinically used drug with HSP-inducing activity, conferred protection against bleomycin-induced pulmonary injury, as well as against the inflammatory response, fibrosis and dysfunction. These results suggest that HSP70 plays a protective role against bleomycin-induced pulmonary injury, inflammation, fibrosis and dysfunction through cytoprotective effects and by inhibiting the production of TGF-beta1, TGF-beta1-dependent EMT of epithelial cells and expression of pro-inflammatory cytokines. Results also suggest that HSP70-inducing drugs, such as GGA, could be beneficial in the prophylaxis of IPF.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Bleomycin / toxicity*
  • Cell Line, Tumor
  • Disease Models, Animal
  • HSP70 Heat-Shock Proteins / biosynthesis
  • HSP70 Heat-Shock Proteins / genetics
  • HSP70 Heat-Shock Proteins / physiology*
  • Humans
  • Inflammation Mediators / physiology
  • Inflammation Mediators / toxicity
  • Mice
  • Mice, Transgenic
  • Pulmonary Fibrosis / chemically induced*
  • Pulmonary Fibrosis / pathology
  • Pulmonary Fibrosis / prevention & control*


  • HSP70 Heat-Shock Proteins
  • Inflammation Mediators
  • Bleomycin