Neutrophil-derived elastase induces TGF-β1 secretion in human airway smooth muscle via NF-κB pathway

Kang Yun Lee, Shu Chuan Ho, Horng Chyuan Lin, Shu Min Lin, Chien Ying Liu, Chien Da Huang, Chun Hua Wang, Kian Fan Chung, Han Pin Kuo

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Neutrophils are infiltrated in airways of individuals with more severe and chronic asthma, with uncertain significance. Airway smooth muscle (ASM), apart from its contractile properties, is critically involved in the pathogenesis of asthma by producing inflammatory mediators. In the present study, we investigated the impact of neutrophil-derived elastase (NE) on ASM in terms of TGF-β1 release, and we explored the underlying mechanisms. Primary ASM cells were serum starved for 24 h before stimulation with NE (0.01-0.5 μg/ml). TGF-β1 in supernatant was determined by ELISA and mRNA quantified by real-time RT-QPCR. NF-κB nuclear translocation and activation was examined by Western blotting and κB-2 dEGFP reporter gene assay. Association of IL-1 receptor-associated kinase (IRAK) with MyD88 was studied by co-immunoprecipitation and Toll-like receptor 4 (TLR4) determined by FACS scan and Western blotting. We demonstrated that NE enhanced TGF-β1 release in a time-dependent manner. This induction was inhibited by actinomycin D (5 mM), cycloheximide (5 mM), and NF-κB inhibitors, including pyrrolidine dithiocarbamate (PDTC, 1 mM), aspirin (2.5 mM), and sodium salyicylate (2.5 mM). Stimulation with NE was rapidly followed by association of IRAK with MyD88, phosphorylation of IκBα, and nuclear translocation of p65 with increased transactivation activity. We also found that TLR4 levels were reduced upon NE treatment. These data suggest that NE upregulates TGF-β1 gene expression and release via My88/IRAK/NF-κB pathway, possibly through activation of TLR4, and shed light on a potential role of neutrophils in the pathogenesis of asthma.

Original languageEnglish
Pages (from-to)407-414
Number of pages8
JournalAmerican Journal of Respiratory Cell and Molecular Biology
Volume35
Issue number4
DOIs
Publication statusPublished - Oct 2006
Externally publishedYes

Fingerprint

Leukocyte Elastase
Pancreatic Elastase
Smooth Muscle
Muscle
Interleukin-1 Receptor-Associated Kinases
Toll-Like Receptor 4
Asthma
Neutrophils
Western Blotting
Chemical activation
Phosphorylation
Dactinomycin
Cycloheximide
Reporter Genes
Immunoprecipitation
Gene expression
Transcriptional Activation
Aspirin
Smooth Muscle Myocytes
Assays

Keywords

  • Airway smooth muscle
  • Elastase
  • NF-κB; TGF-β1
  • Toll-like receptor 4

ASJC Scopus subject areas

  • Cell Biology
  • Pulmonary and Respiratory Medicine
  • Molecular Biology

Cite this

Neutrophil-derived elastase induces TGF-β1 secretion in human airway smooth muscle via NF-κB pathway. / Lee, Kang Yun; Ho, Shu Chuan; Lin, Horng Chyuan; Lin, Shu Min; Liu, Chien Ying; Huang, Chien Da; Wang, Chun Hua; Chung, Kian Fan; Kuo, Han Pin.

In: American Journal of Respiratory Cell and Molecular Biology, Vol. 35, No. 4, 10.2006, p. 407-414.

Research output: Contribution to journalArticle

Lee, Kang Yun ; Ho, Shu Chuan ; Lin, Horng Chyuan ; Lin, Shu Min ; Liu, Chien Ying ; Huang, Chien Da ; Wang, Chun Hua ; Chung, Kian Fan ; Kuo, Han Pin. / Neutrophil-derived elastase induces TGF-β1 secretion in human airway smooth muscle via NF-κB pathway. In: American Journal of Respiratory Cell and Molecular Biology. 2006 ; Vol. 35, No. 4. pp. 407-414.
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AU - Ho, Shu Chuan

AU - Lin, Horng Chyuan

AU - Lin, Shu Min

AU - Liu, Chien Ying

AU - Huang, Chien Da

AU - Wang, Chun Hua

AU - Chung, Kian Fan

AU - Kuo, Han Pin

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AB - Neutrophils are infiltrated in airways of individuals with more severe and chronic asthma, with uncertain significance. Airway smooth muscle (ASM), apart from its contractile properties, is critically involved in the pathogenesis of asthma by producing inflammatory mediators. In the present study, we investigated the impact of neutrophil-derived elastase (NE) on ASM in terms of TGF-β1 release, and we explored the underlying mechanisms. Primary ASM cells were serum starved for 24 h before stimulation with NE (0.01-0.5 μg/ml). TGF-β1 in supernatant was determined by ELISA and mRNA quantified by real-time RT-QPCR. NF-κB nuclear translocation and activation was examined by Western blotting and κB-2 dEGFP reporter gene assay. Association of IL-1 receptor-associated kinase (IRAK) with MyD88 was studied by co-immunoprecipitation and Toll-like receptor 4 (TLR4) determined by FACS scan and Western blotting. We demonstrated that NE enhanced TGF-β1 release in a time-dependent manner. This induction was inhibited by actinomycin D (5 mM), cycloheximide (5 mM), and NF-κB inhibitors, including pyrrolidine dithiocarbamate (PDTC, 1 mM), aspirin (2.5 mM), and sodium salyicylate (2.5 mM). Stimulation with NE was rapidly followed by association of IRAK with MyD88, phosphorylation of IκBα, and nuclear translocation of p65 with increased transactivation activity. We also found that TLR4 levels were reduced upon NE treatment. These data suggest that NE upregulates TGF-β1 gene expression and release via My88/IRAK/NF-κB pathway, possibly through activation of TLR4, and shed light on a potential role of neutrophils in the pathogenesis of asthma.

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