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

Abstract

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.

• Authors: Ken-Ichiro Tanaka, Yuta Tanaka, Takushi Namba, Arata Azuma, Tohru Mizushima
• Journal: Biochemical pharmacology (Biochem Pharmacol) Vol. 80 Issue 6 Pg. 920-31 (Sep 15 2010) ISSN: 1873-2968 [Electronic] England
• PMID: 20513440 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright 2010 Elsevier Inc. All rights reserved.

Chemical References

• HSP70 Heat-Shock Proteins
• Inflammation Mediators
• Bleomycin

Topics

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