In previous studies, we have demonstrated that RhoA⁄B-dependent signal-ing regulates TGFb-induced rapid actin reorganization in Swiss 3T3 fibro-blasts. Here we report that TGFbregulates long-term actin remodeling by increasing the steady-state mRNA levels of the RhoBgene in mouse Swiss 3T3 fibroblasts and human hepatoma HepG2 cells.