Neutrophil elastase induces IL-8 synthesis by lung epithelial cells via the mitogen-activated protein kinase pathway

Hao Cheng Chen, Horng Chyuan Lin, Chien Ying Liu, Chun Hua Wang, Tritium Hwang, Tzu Ting Huang, Chien-Huang Lin, Han Pin Kuo

Research output: Contribution to journalArticle

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Abstract

The sequestration of neutrophils in the lung and the release of proinflammatory mediators, including neutrophil elastase, are responsible for sepsis-induced microvascular permeability and alveolar epithelial cell damage. To assess the underlying mechanism, human neutrophil elastase (0.01-0.5 μg/ml) was added to cultured A549 epithelial cells in the presence or absence of inhibitors. IL-8 was analyzed by ELISA or by RT-PCR to measure the IL-8 synthesis capacity. Mitogen-activated protein kinase (MAPK) activity was detected by Western blot analysis. Neutrophil elastase dose-dependently increased IL-8 release from cultured A549 epithelial cells. Pretreatment with a specific elastase inhibitor, elastase inhibitor II (at 0.5, 5, and 50 μg/ml), dose-dependently inhibited neutrophil elastase-induced IL-8 release. The activities of MAPK, p38, and extracellular signal-regulated kinase (ERK) were upregulated by neutrophil elastase. Nuclear transcriptional factor-kappa B (NF-κB) and activator protein 1 (AP-1) were also activated. These responses were significantly inhibited by elastase inhibitor II. A specific inhibitor of p38 MAPK (SB203580) and an NF-κB inhibitor (pyrrolidine dithiocarbamate), but not an ERK inhibitor (PD 98059), significantly inhibited neutrophil elastase-induced IL-8 release and mRNA expression. The specific tyrosine kinase inhibitor, genistein, and the protein kinase C (PKC) inhibitor, Ro 31-8220, also inhibited IL-8 release and mRNA expression as well as p38 and NF-κB activation. There was no significant effect by the protein kinase A inhibitor, H-89, on neutrophil elastase-induced IL-8 synthesis or p38 MAPK activation. Our results indicate that neutrophil elastase activates p38 MAPK which upregulates NF-κB and AP-1 activities, thus inducing IL-8 mRNA expression and protein synthesis. Tyrosine kinase and PKC are implicated in neutrophil elastase activation of the MAPK pathway.

Original languageEnglish
Pages (from-to)49-58
Number of pages10
JournalJournal of Biomedical Science
Volume11
Issue number1
DOIs
Publication statusPublished - 2004

Fingerprint

Leukocyte Elastase
Mitogen-Activated Protein Kinases
Interleukin-8
Epithelial Cells
Lung
p38 Mitogen-Activated Protein Kinases
Pancreatic Elastase
Chemical activation
Extracellular Signal-Regulated MAP Kinases
Transcription Factor AP-1
Protein Kinase Inhibitors
Protein-Tyrosine Kinases
Messenger RNA
Protein Kinase C
Cultured Cells
Alveolar Epithelial Cells
Neutrophil Activation
Protein C Inhibitor
NF-kappa B
Genistein

Keywords

  • Alveolar epithelial cells
  • Elastase
  • IL-8
  • Mitogen-activated protein kinase

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Neutrophil elastase induces IL-8 synthesis by lung epithelial cells via the mitogen-activated protein kinase pathway. / Chen, Hao Cheng; Lin, Horng Chyuan; Liu, Chien Ying; Wang, Chun Hua; Hwang, Tritium; Huang, Tzu Ting; Lin, Chien-Huang; Kuo, Han Pin.

In: Journal of Biomedical Science, Vol. 11, No. 1, 2004, p. 49-58.

Research output: Contribution to journalArticle

Chen, Hao Cheng ; Lin, Horng Chyuan ; Liu, Chien Ying ; Wang, Chun Hua ; Hwang, Tritium ; Huang, Tzu Ting ; Lin, Chien-Huang ; Kuo, Han Pin. / Neutrophil elastase induces IL-8 synthesis by lung epithelial cells via the mitogen-activated protein kinase pathway. In: Journal of Biomedical Science. 2004 ; Vol. 11, No. 1. pp. 49-58.
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AB - The sequestration of neutrophils in the lung and the release of proinflammatory mediators, including neutrophil elastase, are responsible for sepsis-induced microvascular permeability and alveolar epithelial cell damage. To assess the underlying mechanism, human neutrophil elastase (0.01-0.5 μg/ml) was added to cultured A549 epithelial cells in the presence or absence of inhibitors. IL-8 was analyzed by ELISA or by RT-PCR to measure the IL-8 synthesis capacity. Mitogen-activated protein kinase (MAPK) activity was detected by Western blot analysis. Neutrophil elastase dose-dependently increased IL-8 release from cultured A549 epithelial cells. Pretreatment with a specific elastase inhibitor, elastase inhibitor II (at 0.5, 5, and 50 μg/ml), dose-dependently inhibited neutrophil elastase-induced IL-8 release. The activities of MAPK, p38, and extracellular signal-regulated kinase (ERK) were upregulated by neutrophil elastase. Nuclear transcriptional factor-kappa B (NF-κB) and activator protein 1 (AP-1) were also activated. These responses were significantly inhibited by elastase inhibitor II. A specific inhibitor of p38 MAPK (SB203580) and an NF-κB inhibitor (pyrrolidine dithiocarbamate), but not an ERK inhibitor (PD 98059), significantly inhibited neutrophil elastase-induced IL-8 release and mRNA expression. The specific tyrosine kinase inhibitor, genistein, and the protein kinase C (PKC) inhibitor, Ro 31-8220, also inhibited IL-8 release and mRNA expression as well as p38 and NF-κB activation. There was no significant effect by the protein kinase A inhibitor, H-89, on neutrophil elastase-induced IL-8 synthesis or p38 MAPK activation. Our results indicate that neutrophil elastase activates p38 MAPK which upregulates NF-κB and AP-1 activities, thus inducing IL-8 mRNA expression and protein synthesis. Tyrosine kinase and PKC are implicated in neutrophil elastase activation of the MAPK pathway.

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