Apolipoprotein A1 Inhibits TGF-β1-Induced Epithelial-to-Mesenchymal Transition of Alveolar Epithelial Cells
- Abstract
- Background: Idiopathic pulmonary fibrosis (IPP) is a progressive and lethal lung disease characterized by the accumulation of excessive fibroblasts and myofibroblasts in the extracellular matrix. The transforming growth factor beta 1 (TGF-beta 1)-induced epithelial-to-mesenchymal transition (EMT) is thought to be a possible source of fibroblasts/myofibroblasts in IPF lungs. We have previously reported that apolipoprotein A1 (ApoA1) has anti-fibrotic activity in experimental lung fibrosis. In this study, we deteimine whether ApoA1 modulates TGF-beta 1-induced EMT in experimental lung fibrosis and clarify its mechanism of action. Methods: The A549 alveolar epithelial cell line was treated with TGE-beta 1 with or without ApoAl. Morphological changes and expression of EN/If-related markers, including E-cadherin, N-cadherin, and alpha-smooth muscle actin were evaluated. Expressions of Salad and non-Smad mediators and TGF-beta 1 receptor type I (T beta RI) and type 2 (T beta RII) were measured. The silica-induced lung fibrosis model was established using ApoA1 overexpressing transgenic mice. Results: TGF-beta 1-treated A549 cells were changed to the mesenchymal morphology with less E-cadherin and more N-cadherin expression. The addition of ApoA1 inhibited the TGF-beta 1-induced change of the EMT phenotype. ApoA1 inhibited the TGF-beta 1-induced increase in the phosphorvlation of Smad2 and 3 as well as that of ERK and p38 mitogen-activated protein kinase mediators. In addition, ApoA1 reduced the TGF-beta 1-induced increase in T beta RI and T beta RII expression. In a mouse model of silica-induced lung fibrosis, ApoA1 overexpression reduced the silica-mediated effects, which were increased N-cadherin and decreased E-cadherin expression in the alveolar epithelium. Conclusion: Our data demonstrate that ApoA1 inhibits TGFT-beta 1-induced EMT in experimental lung fibrosis.
- All Author(s)
- A. R. Baek
; J. M. Lee
; H. J. Seo
; J. S. Park
; J. H. Lee
; S. W. Park
; A. S. Jang
; D. J. Kim
; E. S. Koh
; S. T. Uh
; Y. H. Kim
; C. S. Park
- Issued Date
- 2016
- Type
- Article
- Keyword
- Apolipoprotein A-1; Transforming Growth Factor Beta1; Epithelial-Mesenchymal Transition; Pulmonary Fibrosis
- Publisher
- 대한결핵및호흡기학회
The Korean Academy of Tuberculosis and Respiratory Diseases
- ISSN
- 0378-0066
; 1738-3536
; 2005-6184
- Citation Title
- Tuberculosis and respiratory diseases
- Citation Volume
- 79
- Citation Number
- 3
- Citation Start Page
- 143
- Citation End Page
- 152
- Language(ISO)
- eng
- DOI
- 10.4046/trd.2016.79.3.143
- URI
- http://schca-ir.schmc.ac.kr/handle/2022.oak/1933
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