Format

Send to

Choose Destination
Oncogene. 2008 May 29;27(24):3489-93. doi: 10.1038/sj.onc.1211004. Epub 2008 Jan 14.

PU.1 binding to the p53 family of tumor suppressors impairs their transcriptional activity.

Author information

1
Experimental Oncology/Hematology, Department of Clinical Research, University of Bern, Bern, Switzerland.

Abstract

The transcription factor PU.1 is essential for terminal myeloid differentiation, B- and T-cell development, erythropoiesis and hematopoietic stem cell maintenance. PU.1 functions as oncogene in Friend virus-induced erythroleukemia and as tumor suppressor in acute myeloid leukemias. Moreover, Friend virus-induced erythroleukemia requires maintenance of PU.1 expression and the disruption of p53 function greatly accelerates disease progression. It has been hypothesized that p53-mediated expression of the p21(Cip1) cell cycle inhibitor during differentiation of pre-erythroleukemia cells promotes selection against p53 function. In addition to the blockage of erythroblast differentiation provided by increased levels of PU.1, we propose that PU.1 alters p53 function. We demonstrate that PU.1 reduces the transcriptional activity of the p53 tumor suppressor family and thus inhibits activation of genes important for cell cycle regulation and apoptosis. Inhibition is mediated through binding of PU.1 to the DNA-binding and/or oligomerization domains of p53/p73 proteins. Lastly, knocking down endogenous PU.1 in p53 wild-type REH B-cell precursor leukemia cells leads to increased expression of the p53 target p21(Cip1).

PMID:
18193090
DOI:
10.1038/sj.onc.1211004
[Indexed for MEDLINE]

Publication types, MeSH terms, Substances, Grant support

Supplemental Content

Full text links

Icon for Nature Publishing Group
Loading ...
Support Center