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Programmed cell death and the proteasome

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Abstract

A characteristic feature of apoptotic cell death is the activation of a cascade of cytoplasmic proteases that results in the cleavage of a limited number of target proteins. A central role in these proteolytic events has been assigned to members of the capase family. However, the use of low molecular weight proteasomal inhibitors has also demonstrated that protein degradation or processing by the ubiquitin-proteasome system of the cell has a decisive impact on cell survival and death as well, depending on the cell type and/or the proliferative status of the cells studied. Treatment of proliferating cells with proteasome inhibitors leads to cell death, potentially involving an internal signalling conflict between accumulating levels of the cdk inhibitor p27Kip1 and c-myc. In contrast, in terminally differentiated cells the same compounds have the opposite effect of blocking apoptosis, possibly by preventing proteasome-mediated degradation of a capase inhibitor. In this review the role of proteasome-mediated proteolysis in the dying cell is discussed and apparently conflicting results are integrated into a working hypothesis which functionally locates the proteasome upstream of capase3-like enzymes.

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Drexler, H.C.A. Programmed cell death and the proteasome. Apoptosis 3, 1–7 (1998). https://doi.org/10.1023/A:1009604900979

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  • DOI: https://doi.org/10.1023/A:1009604900979

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