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Home Search Quick Search Advanced Fulltext Browse Collections Persons My eDoc Session History Login Name: Password: Documentation Help Support Wiki Direct access to document ID:	Institute: MPI für Herz- und Lungenforschung (W. G. Kerckhoff Institut)     Collection: Publikationen des W. G. Kerckhoff-Instituts     Display Documents ID: 474520.0, MPI für Herz- und Lungenforschung (W. G. Kerckhoff Institut) / Publikationen des W. G. Kerckhoff-Instituts SNAI transcription factors mediate epithelial-mesenchymal transition in lung fibrosis Authors: Jayachandran, A.; Konigshoff, M.; Yu, H.; Rupniewska, E.; Hecker, M.; Klepetko, W.; Seeger, W.; Eickelberg, O. Date of Publication (YYYY-MM-DD): 2009 Title of Journal: Thorax Volume: 64 Issue / Number: 12 Start Page: 1053 End Page: 61 Audience: Not Specified Abstract / Description: BACKGROUND: Idiopathic pulmonary fibrosis (IPF) is a fatal interstitial lung disease characterised by accumulation of activated (myo)fibroblasts and excessive extracellular matrix deposition. The enhanced accumulation of (myo)fibroblasts may be attributed, in part, to the process of transforming growth factor beta1 (TGFbeta1)-induced epithelial-mesenchymal transition (EMT), the phenotypic switching of epithelial to fibroblast-like cells. Although alveolar epithelial type II (ATII) cells have been shown to undergo EMT, the precise mediators and mechanisms remain to be resolved. The objective of this study is to investigate the role of SNAI transcription factors in the process of EMT and in IPF. METHODS: Using quantitative reverse transcription-PCR (RT-PCR), immunofluorescence, immunohistochemistry, western blotting, as well as gain- and loss-of-function studies and functional assays, the role of SNAI1 and SNAI2 in TGFbeta1-induced EMT in ATII cells in vitro was assessed; and the expression of SNAI transcription factors was analysed in experimental and human IPF in vivo. RESULTS: TGFbeta1 treatment increased the expression and nuclear accumulation of SNAI1 and SNAI2, in concert with induction of EMT in ATII cells. SNAI overexpression was sufficient to induce EMT, and small interfering RNA (siRNA)-mediated SNAI depletion attenuated TGFbeta1-induced ATII cell migration and EMT. SNAI expression was elevated in experimental and human IPF and localised to hyperplastic ATII cells in vivo. CONCLUSIONS: The results demonstrate that TGFbeta1-induced EMT in ATII cells is essentially controlled by the expression and nuclear translocation of SNAI transcription factors. Increased SNAI1 and SNAI2 expression in experimental and human IPF in vivo suggests that SNAI-mediated EMT may contribute to the fibroblast pool in idiopathic pulmonary fibrosis. Free Keywords: Adult; Animals; Cell Differentiation/drug effects/physiology; Cell Line; Cell Movement/drug effects; Cells, Cultured; Disease Models, Animal; Epithelial Cells/drug effects/*pathology; Extracellular Matrix Proteins/pharmacology; Female; Gene Silencing; Humans; Male; Mesenchymal Stem Cells/drug effects/*pathology; Mice; Mice, Inbred C57BL; Middle Aged; Pulmonary Fibrosis/metabolism/*pathology/physiopathology; RNA, Small Interfering/genetics; Reverse Transcriptase Polymerase Chain Reaction/methods; Transcription Factors/metabolism/*physiology; Transforming Growth Factor beta/pharmacology External Publication Status: published Document Type: Article Communicated by: N. N. Affiliations: MPI für physiologische und klinische Forschung External Affiliations: Department of Medicine, University of Giessen Lung Center, University of Giessen, Giessen, Germany. Identifiers: ISSN:1468-3296 (Electronic) 0040-6376 (Linking) URL:http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=.. The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.