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Negative regulation of Par-4 by oncogenic Ras is essential for cellular transformation.

Authors
  • Qiu, S G
  • Krishnan, S
  • el-Guendy, N
  • Rangnekar, V M
Type
Published Article
Journal
Oncogene
Publisher
Springer Nature
Publication Date
Nov 25, 1999
Volume
18
Issue
50
Pages
7115–7123
Identifiers
PMID: 10597313
Source
Medline
License
Unknown

Abstract

Oncogenic variants of the cellular Ras protein are often associated with different types of human cancers. However, the mechanisms by which oncogenic Ras induces transformation are not fully established. Expression of the transcriptional repressor Par-4 was down-regulated by oncogenic Ras via the Raf-MEK-ERK pathway. Restoration of Par-4 levels by abrogation of the Raf-MEK-ERK pathway with the MEK-inhibitor PD98059 or by ectopic Par-4, that acted to inhibit ERK expression and activation, was sufficient to suppress oncogenic Ras-induced transformation. These findings identify Par-4 as a novel target that has to be down-modulated by oncogenic Ras for successful transformation.

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