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Role of Reactive Oxygen Species in Transforming Growth Factor-β1-inuduced Fibronectin Secretion and α-Smooth Muscle Actin Expression in Human Lung Fibroblasts  

Ha, Hunjoo (Hyonam Kidney Laboratory, Soon Chun Hyang University)
Yu, Mi-Ra (Hyonam Kidney Laboratory, Soon Chun Hyang University)
Uh, Soo-taek (Hyonam Kidney Laboratory, Soon Chun Hyang University)
Park, Choon Sik (Hyonam Kidney Laboratory, Soon Chun Hyang University)
Lee, Hi Bahl (Hyonam Kidney Laboratory, Soon Chun Hyang University)
Publication Information
Tuberculosis and Respiratory Diseases / v.58, no.3, 2005 , pp. 267-276 More about this Journal
Abstract
Background : The transforming growth $factor-{\beta}1$ ($TGF-{\beta}1$) plays a key role in lung fibrosis. However, the molecular mechanisms involved in $TGF-{\beta}1$-induced lung fibrosis are unclear. $TGF-{\beta}1$ is the key inducer of myofibroblast transdifferentiation via de novo synthesis of ${\alpha}-smooth$ muscle actin (${\alpha}-SMA$). Since $TGF-{\beta}1$ signals through reactive oxygen species (ROS) and ROS have been shown to induce accumulation of extracellular matrix (ECM) in various tissues, this study examined if ROS play a role in $TGF-{\beta}1$-induced fibronectin secretion and ${\alpha}-SMA$ expression in human lung fibroblasts, MRC-5 cells. Methods : Growth arrested and synchronized MRC-5 cells were stimulated with $TGF-{\beta}1$ (0.2-10 ng/ml) in the presence or absence of N-acetylcysteine (NAC) or diphenyleneiodonium (DPI) for up to 96 hours. Dichlorofluorescein (DCF)-sensitive cellular ROS were measured by FACScan and secreted fibronectin and cellular ${\alpha}-SMA$ by Western blot analysis. Results : $TGF-{\beta}1$ increased the level of fibronectin secretion and ${\alpha}-SMA$ expression in MRC-5 cells in a dosedependent manner. Both NAC (20 and 30 mM) and DPI (1 and $5{\mu}M$) significantly inhibited $TGF-{\beta}1$-induced fibronectin and ${\alpha}-SMA$ upregulation. The $TGF-{\beta}1$-induced cellular ROS level was also significantly reduced by NAC and DPI. Conclusions : The results suggest that NADPH oxidase-dependent ROS play an important role in $TGF-{\beta}1$-induced fibronectin secretion and ${\alpha}-SMA$ expression in MRC-5 cells, which leads to myofibroblast transdifferentiation and progressive lung fibrosis.
Keywords
Pulmonary fibrosis; Transforming growth factor-beta1; Reactive oxygen species; ${\alpha}$-Smooth muscle actin; Fibroblast; Myofibroblast; Fibronectin; N-acetylcysteine; Diphenyleneiodonium;
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