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We investigated the mechanism whereby cell contact injury stimulates the α-smooth muscle actin (SMA) promoter, a key process for epithelial–mesenchymal transition (EMT) during organ fibrosis. Contact disruption by low-Ca 2+ medium (LCM) activated Rac, PAK and p38 MAPK, and triggered the nuclear accumulation of myocardin-related transcription factor (MRTF), an inducer of the SMA promoter. Dominant...
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