siRNA-mediated knockdown of Pdcd4 expression causes upregulation of p21(Waf1/Cip1) expression.

Abstract:

:The transformation suppressor gene, programmed cell death gene 4 (Pdcd4), inhibits tumor-promoter-mediated transformation of mouse keratinocytes and has been implicated as a tumor suppressor gene in the development of human cancer. The Pdcd4 protein interacts with translation initiation factors eIF4A and eIF4G and binds to RNA, suggesting that it might be involved in regulating protein translation or other aspects of RNA metabolism. To study the function of Pdcd4 in more detail, we have downregulated Pdcd4 expression in HeLa cells by stable expression of shRNA. We have found that diminished Pdcd4 expression leads to increased expression of p21(Waf1/Cip1) and several other p53-regulated genes. Reporter gene studies demonstrate that Pdcd4 interferes with the activation of p53-responsive promoters genes by p53. Pdcd4 knockdown cells show decreased apoptosis and increased survival after UV irradiation. Taken together, our observations suggest a model in which low Pdcd4 expression after DNA damage favors the survival of cells, which would be eliminated by apoptosis under normal levels of Pdcd4 expression. Our results provide the first evidence that Pdcd4 is important role in the DNA-damage response and suggest that low levels of Pdcd4 expression observed in certain tumor cells contribute to tumorigenesis by affecting the fate of DNA-damaged cells.

journal_name

Oncogene

journal_title

Oncogene

authors

Bitomsky N,Wethkamp N,Marikkannu R,Klempnauer KH

doi

10.1038/onc.2008.115

subject

Has Abstract

pub_date

2008-08-14 00:00:00

pages

4820-9

issue

35

eissn

0950-9232

issn

1476-5594

pii

onc2008115

journal_volume

27

pub_type

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