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• W1560135361 abstract "The aspartic protease cathepsin D (CD) is a key mediator of induced-apoptosis and its proteolytic activity has been generally involved in this event. During apoptosis, CD is translocated to the cytosol. Since CD is one of the lysosomal enzymes that requires a more acidic pH to be proteolytically-active relative to the cysteine lysosomal enzymes such as cathepsin-B and cathepsin-L, it is therefore open to question whether cytosolic CD might be able to cleave substrate(s) implicated in the apoptotic cascade. Here, we have investigated the role of (wild-type) wt CD and its proteolytically inactive counterpart overexpressed by 3Y1-Ad12 cancer cells during chemotherapeutic-induced cytotoxicity and apoptosis, as well as the relevance of CD catalytic function. We demonstrate that wt or mutated catalytically inactive CD strongly enhances chemo-sensitivity and apoptotic response to etoposide. Both wt and mutated inactive CD are translocated to the cytosol, increasing the release of cytochrome c, the activation of caspases-9 and caspases-3 and the induction of a caspase-dependent apoptosis. In addition, pretreatment of cells with the aspartic protease inhibitor, pepstatin A, does not prevent apoptosis. Interestingly, therefore, the stimulatory effect of CD on cell death is independent of its catalytic activity. Overall, our results imply that cytosolic CD stimulates apoptotic pathways by interacting with a member of the apoptotic machinery rather than by cleaving specific substrate(s)." @default.
• W1560135361 created "2016-06-24" @default.
• W1560135361 creator A5036595403 @default.
• W1560135361 creator A5073892977 @default.
• W1560135361 date "2008-01-01" @default.
• W1560135361 modified "2023-10-13" @default.
• W1560135361 title "Cathepsin D Overexpressed by Cancer Cells Can Enhance Apoptosis-dependent Chemo-sensitivity Independently of Its Catalytic Activity" @default.
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• W1560135361 doi "https://doi.org/10.1007/978-0-387-69080-3_44" @default.
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