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Cysteine cathepsins B and X promote epithelial-mesenchymal transition of tumor cells
Mitrović, Ana ; Pečar Fonović, Urša ; Kos, Janko, 1959-
Cathepsins B and X are lysosomal cysteine carboxypeptidases suggested as having a redundant role in cancer. They are involved in a number of processes leading to tumor progression but their role in ...the epithelial-mesenchymal transition (EMT) remains unknown. We have investigated the contribution of both cathepsins B and X in EMT using tumor cell lines differing in their expression of epithelial and mesenchymal markers and cell morphology. Higher levels of both cathepsins are shown to promote EMT and are associated with the mesenchymal-like cell phenotype. Moreover, simultaneous knockdown of the two peptidases triggers a reverse, mesenchymal to epithelial transition. Of the two cathepsins, cathepsin B appears to be the stronger promotor of EMT. Furthermore, we evaluated the involvement of cathepsin B and X in the transforming growth factor-beta1 (TGF-beta1) signaling pathway, one of the key signaling mechanisms triggering EMT in cancer. In MCF-7 cells the expression of cathepsin B was shown to depend on their activation with TGF-beta1 while, for cathepsin X, a TGF-beta1 independent mechanism of induction during EMT is indicated. EMT is thus shown to be another mechanism linking cathepsins B and X with tumor progression. With silencing of their expression or inhibition of enzymatic activity, the tumor cells could be reverted to less aggressive epithelial-like phenotype.
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