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Keiichi Aomatsu, Tokuzo Arao, Koji Sugioka, Kazuko Matsumoto, Daisuke Tamura, Kanae Kudo, Hiroyasu Kaneda, Kaoru Tanaka, Yoshihiko Fujita, Yoshikazu Shimomura, Kazuto Nishio; TGF-β Induces Sustained Upregulation of SNAI1 and SNAI2 through Smad and Non-Smad Pathways in a Human Corneal Epithelial Cell Line. Invest. Ophthalmol. Vis. Sci. 2011;52(5):2437-2443. doi: 10.1167/iovs.10-5635.
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The aim of this study was to investigate the expression changes of epithelial mesenchymal transition (EMT)-related molecules induced by TGF-β signaling in a human corneal epithelial cell line (HCECs).
The cellular response to TGF-β was evaluated by immunoblotting, quantitative real-time RT-PCR, and immunofluorescence microscopy in HCECs.
TGF-β significantly increased mRNA expression of SNAI1, SNAI2, VIM, and FN1, but not TWIST1 through Smad and non-Smad pathways in HCECs. Protein expression of a mesenchymal marker N-cadherin was dose-dependently increased and that of an epithelial marker of E-cadherin was decreased by TGF-β. TGF-β, but not EGF, mediated the EMT-like morphologic changes. Both TGF-β and EGF were capable of upregulating SNAI1 and SNAI2 by about two-fold within a short response time. However, a detailed time course analysis revealed drastically different expression patterns, with TGF-β mediating a sustained upregulation of SNAI1 and SNAI2 for at least for 6 days and EGF allowing a return to the baseline expression values after 8 ∼ 12 h. These data indicate that TGF-β, but not EGF, induces sustained upregulation of SNAI1 and SNAI2 in HCECs.
TGF-β induces sustained upregulation of SNAI1 and SNAI2 through Smad and non-Smad pathways, EMT-like morphologic changes, downregulation of E-cadherin, and upregulation of N-cadherin in HCECs. The authors' findings provide insight into the TGF-β signaling and the temporal expression patterns of EMT-inducible transcription factors in HCECs.
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