Cancer Res. 1998 Oct 15;58(20):4531-6.

p53-mediated repression of nuclear factor-kappaB RelA via the transcriptional integrator p300.

Ravi R, Mookerjee B, van Hensbergen Y, Bedi GC, Giordano A, El-Deiry WS, Fuchs EJ, Bedi A.

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Johns Hopkins Oncology Center, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287-8967, USA.

Abstract

The p53 tumor suppressor gene plays an instrumental role in transcriptional regulation of target genes involved in cellular stress responses. p53-dependent transactivation and transrepression require its interaction with p300/CBP, a coactivator that also interacts with the RelA subunit of nuclear factor-kappaB. We find that p53 inhibits RelA-dependent transactivation without altering RelA expression or inducible kappaB-DNA binding. p53-mediated repression of RelA is relieved by p300 overexpression and the increased RelA activity conferred by p53-deficiency is counteracted by either transactivation domain-deficient p300 fragments that bind RelA or a transdominant mutant of IkappaB alpha. Our results suggest that p53 can regulate diverse kappaB-dependent cellular responses.

PMID:: 9788595; [PubMed - indexed for MEDLINE]

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p53-mediated repression of nuclear factor-kappaB RelA via the transcriptional integrator p300.

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