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Mutant p53 initiates a feedback loop that involves Egr-1/EGF receptor/ERK in prostate cancer cells.

Abstract：

:Early growth response-1 (Egr-1) is overexpressed in human prostate tumors and contributes to cancer progression. On the other hand, mutation of p53 is associated with advanced prostate cancer, as well as with metastasis and hormone independence. This study shows that in prostate cell lines in culture, Egr-1 overexpression correlated with an alteration of p53 activity because of the expression of SV40 large T-antigen or because of a mutation in the TP53 gene. In cells containing altered p53 activity, Egr-1 expression was abolished by pharmacological inhibition or RNAi silencing of p53. Although forced expression of wild-type p53 was not sufficient to trigger Egr-1 transcription, four different mutants of p53 were shown to induce Egr-1. Direct binding of p53 to the EGR1 promoter could not be detected. Instead, Egr-1 transcription was driven by the ERK1/2 pathway, as it was abrogated by specific inhibitors of MEK. Egr-1 increased the transcription of HB-EGF (epidermal growth factor), amphiregulin and epiregulin, resulting in autocrine activation of the EGF receptor (EGFR) and downstream MEK/ERK cascade. Thus, mutant p53 initiates a feedback loop that involves ERK1/2-mediated transactivation of Egr-1, which in turn increases the secretion of EGFR ligands and stimulates the EGFR signaling pathway. Finally, p53 may further regulate this feedback loop by altering the level of EGFR expression.

journal_name

Oncogene

journal_title

Oncogene

authors

Sauer L,Gitenay D,Vo C,Baron VT

doi

10.1038/onc.2010.24

subject

Has Abstract

pub_date

2010-05-06 00:00:00

pages

2628-37

issue

18

eissn

0950-9232

issn

1476-5594

pii

onc201024

journal_volume

29

pub_type

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