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Journal Article
Research Support, Non-U.S. Gov't
Rho activation is required for transforming growth factor-beta-induced epithelial-mesenchymal transition in lens epithelial cells.
Cell Biology International 2007 October
Lens epithelial cells undergo epithelial-mesenchymal transition (EMT) after injury as in cataract extraction, leading to fibrosis of the lens capsule. We have recently shown that TGF-beta-induced EMT in lens epithelial cells depends on PI3 kinase/Akt signal pathway. In this report, we suggest Smad3 is necessary for TGF-beta-induced EMT by showing that the expression of dominant-negative Smad3 blocks the expression of alpha-smooth muscle actin (alpha-SMA) and morphological changes. We also show that TGF-beta induces a biphasic change in Rho activity, and that Y27632, a selective inhibitor of Rho effector ROCK, inhibits TGF-beta-induced EMT in vitro and in vivo. We finally show that Smad3 activation and Rho signal activation is independent each other. All of these findings suggest that Rho/ROCK activation together with Smad3 is necessary for TGF-beta-induced EMT in lens epithelial cells.
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