Figure 4.
Pathways related to epithelial-mesenchymal transition.
Activation of the TGF-β pathway leads to EMT through the regulation of SMAD and other downstream effectors. The WNT/β-catenin pathway intersects with the SMAD-dependent pathway and contributes to EMT cooperatively. TGF-β: transforming growth factor-β; SMAD: mothers against decapentaplegic; WNT: Wingless; FZD: Frizzled; DVL: Dishevelled; LEF: lymphoid enhancer factor; ZEB: zinc-finger E-box-binding; MMP: matrix metalloproteinase; EMT: epithelial-mesenchymal transition.