p53-dependent induction of apoptosis by proteasome inhibitors

被引:446
作者
Lopes, UG
Erhardt, P
Yao, RJ
Cooper, GM
机构
[1] HARVARD UNIV,SCH MED,DANA FARBER CANC INST,BOSTON,MA 02115
[2] HARVARD UNIV,SCH MED,DEPT PATHOL,BOSTON,MA 02115
关键词
D O I
10.1074/jbc.272.20.12893
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Proteolysis by the ubiquitin/proteasome pathway controls the intracellular levels of a number of proteins that regulate cell proliferation and cell cycle progression, To determine whether this pathway of protein turnover was also linked to apoptosis, we treated Rat-1 and PC12 cells with specific proteasome inhibitors. The peptide aldehydes PSI and MG115, which specifically inhibit the chymotrypsin-like activity of the proteasome, induced apoptosis of both cell types, In contrast, apoptosis was not induced by inhibitors of lysosomal proteases or by an alcohol analog of PSI. The tumor suppressor p53 rapidly accumulated in cells treated with proteasome inhibitors, as did the p53-inducible gene products p21 and Mdm-2. In addition, apoptosis induced by proteasome inhibitors was inhibited by expression of dominant-negative p53, whereas overexpression of wild-type p53 was sufficient to induce apoptosis of Rat-1 cells in transient transfection assays. Although other molecules may also be involved, these results suggest that stabilization and accumulation of p53 plays a key role in apoptosis induced by proteasome inhibitors.
引用
收藏
页码:12893 / 12896
页数:4
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