Abstract:
:The long-term cellular response to DNA damage is controlled by the tumor suppressor p53. It results in cell-cycle arrest followed by DNA repair and, depending on the degree of damage inflicted, premature senescence or apoptotic cell death. Here we show that in normal diploid fibroblasts the ubiquitin ligase anaphase-promoting complex or cyclosome (APC/C)-Cdh1 becomes prematurely activated in G2 as part of the sustained long-term but not the rapid short-term response to genotoxic stress and results in the degradation of numerous APC/C substrates. Using HCT116 somatic knockout cells we show that mechanistically premature APC/C activation depends on p53 and its transcriptional target p21 that mediates the signal through downregulation of the APC/C inhibitor Emi1. Cdc14B is dispensable in this setting but might function redundantly. Our data suggest an unexpected role for the APC/C in executing a part of the p53-dependent DNA damage response that leads to premature senescence.
journal_name
Oncogenejournal_title
Oncogeneauthors
Wiebusch L,Hagemeier Cdoi
10.1038/onc.2010.99subject
Has Abstractpub_date
2010-06-17 00:00:00pages
3477-89issue
24eissn
0950-9232issn
1476-5594pii
onc201099journal_volume
29pub_type
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