Increased expression of heat shock protein 70 in chronic obstructive pulmonary disease.

Abstract

BACKGROUND:

Heat shock protein 70 (HSP70) plays a critical role in the process of inflammation and innate immunity response under environmental stress.

OBJECTIVES:

This study was to investigate HSP70 expression in the peripheral lung tissues of chronic obstructive pulmonary disease (COPD) patients and in human bronchial epithelial cells (16-HBE) exposed to cigarette smoke extract (CSE).

METHODS:

Peripheral lung tissues were collected after lung cancer resection from 26 patients without COPD, 20 with mild COPD and 15 with advanced COPD, classified by lung function criteria. Among these cases, 37 were smokers and 24 non-smokers. Lung tissues were examined for histopathological changes and levels of HSP70 and IL-8. Cultured 16-HBE cells were stimulated with CSE in the absence or presence of HSP70 neutralizing antibody and the expressions of IL-8 and phospho-EGFR protein were determined.

RESULTS:

Compared to patients without COPD, the levels of HSP70 and IL-8 were significantly increased in the lung tissues of COPD patients and positively correlated with the severity of the disease. The HSP70 expression was significantly higher in current smokers than that in non-smokers. Moreover, CSE-induced HSP70 significantly enhanced IL-8 production and EGFR phosphorylation in 16-HBE cells. The increases in IL-8 and phospho-EGFR were blocked by anti-HSP70 antibody.

CONCLUSIONS:

Our study clarified that increased expression of HSP70 is closely related to COPD disease severity and smoking status. Extracellular HSP70 regulated chemokine productions and EGFR phosphorylation and plays an important role in the CSE-induced inflammatory and innate immunity responses in bronchial epithelia cells.

• Authors: Jiajia Dong, Lingli Guo, Zenglin Liao, Mingke Zhang, Mingzhou Zhang, Tao Wang, Lei Chen, Dan Xu, Yulin Feng, Fuqiang Wen
• Journal: International immunopharmacology (Int Immunopharmacol) Vol. 17 Issue 3 Pg. 885-93 (Nov 2013) ISSN: 1878-1705 [Electronic] Netherlands
• PMID: 24095952 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2013 Elsevier B.V. All rights reserved.

Chemical References

• HSP70 Heat-Shock Proteins
• Interleukin-8
• Smoke

Topics

• Aged
• Cell Line
• Female
• HSP70 Heat-Shock Proteins (genetics, metabolism)
• Humans
• Interleukin-8 (genetics, metabolism)
• Lung (metabolism, pathology)
• Male
• Middle Aged
• Pulmonary Disease, Chronic Obstructive (genetics, metabolism, pathology)
• Smoke
• Nicotiana