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. 1996 Oct 15;15(20):5504–5512.

Pivotal role of a DEVD-sensitive step in etoposide-induced and Fas-mediated apoptotic pathways.

L Dubrez 1, I Savoy 1, A Hamman 1, E Solary 1
PMCID: PMC452295  PMID: 8896444

Abstract

We investigated the role of proteases in the pathway that leads from specific DNA damage induced by etoposide (VP-16), a topoisomerase II inhibitor, to apoptotic DNA fragmentation in the U937 human leukemic cell line. In a reconstituted cell-free system, Triton-soluble extracts from VP-16-treated cells induced internucleosomal DNA fragmentation in nuclei from untreated cells. This effect was inhibited by the tetrapeptide Ac-DEVD-CHO, a competitive inhibitor of the interleukin-1 beta-converting enzyme (ICE)-related protease CPP32, but was not influenced by Ac-YVAD-CHO and Ac-YVAD-CMK, two specific inhibitors of ICE. The three tetrapeptides inhibited Fas-mediated apoptotic DNA fragmentation in the cell-free system. Internucleosomal DNA fragmentation, triggered by either VP-16 or an anti-Fas antibody, was associated with proteolytic cleavage of the poly(ADP-ribose)polymerase (PARP), a decrease in the level of 32 kDa CPP32 proenzyme and the appearance of the CPP32 p17 active subunit. Conversely, the expression of Ich-1L, another ICE-like protease, remained stable in apoptotic U937 cells. Several cysteine and serine protease inhibitors prevented apoptotic DNA fragmentation by acting either upstream or downstream of the DEVD-sensitive protease(s) activation and PARP cleavage. We conclude that a DEVD-sensitive step, which could involve CPP32, plays a central role in the proteolytic pathway that mediates apoptotic DNA fragmentation in VP-16-treated leukemic cells at the crossing with Fas-mediated pathway.

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