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p53 and its homologues, p63 and p73, induce a replicative senescence through inactivation of NF-Y transcription factor.

Authors :
Jung MS
Yun J
Chae HD
Kim JM
Kim SC
Choi TS
Shin DY
Source :
Oncogene [Oncogene] 2001 Sep 13; Vol. 20 (41), pp. 5818-25.
Publication Year :
2001

Abstract

Recent studies have identified two p53 homologues, p63 and p73. They activate p53-responsive promoters and induce apoptosis when overexpressed in certain human tumors. Here, we report that p63, like p53 and p73, induces replicative senescence when expressed in a tetracycline-regulated manner in EJ cells lacking a functional p53. In addition to transcription activation of p53-responsive genes, we found that p63 and p73 repress transcription of the cdk1 and cyclin B genes, both of which are irreversibly repressed in senescent human fibroblast. In transient transfection assay, p63 and p73 repress the cdk1 promoter regardless of the presence of a dominant negative mutant form of p53. Furthermore, we found that DNA binding activity of NF-Y transcription factor, which is essential for transcription of the cdk1 and cyclin B genes and inactivated in senescent fibroblast, is significantly decreased by expression of either of p53, p63, or p73. Since NF-Y binds to many promoters besides the cdk1 and cyclin B promoters, inactivation of NF-Y by p53 family genes may be a general mechanism for transcription repression in replicative senescence.

Details

Language :
English
ISSN :
0950-9232
Volume :
20
Issue :
41
Database :
MEDLINE
Journal :
Oncogene
Publication Type :
Academic Journal
Accession number :
11593387
Full Text :
https://doi.org/10.1038/sj.onc.1204748