Cell Cycle. 2004 Feb;3(2):111-3.

Deregulated repression of c-Jun provides a potential link to its role in tumorigenesis.

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Institute of Toxicology, University of Mainz, Mainz, Germany.

Abstract

The transcription factor c-Jun cooperates with oncogenic alleles of ras in malignant transformation. Constitutively active Ras causes, via activation of mitogen activated protein kinases, phosphorylation of c-Jun which is essential for subsequent target gene activation and tumorigenesis. Studying the mechanisms controlling c-Jun activity we found that its transcription activation function is actively repressed by a presumably multimeric repressor complex that includes histone deacetylase 3 as a critical subunit. Suppression of c-Jun is relieved by MAP kinase-mediated phosphorylation and/or titration of inhibitor components. The viral tumorigenic counterpart of c-Jun, v-Jun, escapes this inhibition, suggesting deregulated transcriptional activity of c-Jun as a relevant cause for carcinogenesis.

PMID:: 14712066; [PubMed - indexed for MEDLINE]

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Landes Bioscience

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Deregulated repression of c-Jun provides a potential link to its role in tumorigenesis.

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