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- W2107870025 abstract "Background. Lysosomal cathepsins B and D have been reported to play a role in various processes leading to progression of malignant disease. In ras-transformed MCF10A neoT cells both enzymes show similar vesicular distribution in perinuclear and peripheral cytoplasmic regions. Results. The co-localization of cathepsins B and D in some vesicles as defined by confocal microscopy supports their co-ordinate activity in the proteolytic cascade. On the other hand, we showed that stefin A, an endogenous intracellular inhibitor of cysteine proteases, did not co-localize with cathepsin B and is presumably not involved in regulation of its enzymatic activity within the vesicles. Intracellular localization of both enzymes was confined to similar vesicles as the fluorescent degradation products of DQ-collagen IV either in individual cells or cell spheroids. The capability of these two enzymes to degrade collagen and other components of extracellular matrix is further supported by the results of Matrigel invasion assay. We showed that specific intracellular (CA-074 Me) and extracellular (CA-074) inhibitors of cathepsin B and pepstatin A, an inhibitor of cathepsin D, significantly reduced invasion of MCF10A neoT cells. Our results also show that in contrast to some other studies the activation peptide of pro-cathepsin D exhibited no mitogenic effect on MCF10A neoT, MCF-7 or HEK-293 cells. Conclusion. We conclude that lysosomal cysteine proteases cathepsins B and D predominantly participate in degradation of extracellular matrix and facilitate invasion of tumour cells." @default.
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- W2107870025 date "2003-12-01" @default.
- W2107870025 modified "2023-09-26" @default.
- W2107870025 title "Cysteine and aspartic proteases cathepsins B and D determine the invasiveness of MCF10A neoT cells" @default.
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