Cited by 68Cancer-related Molecular PathwaysCell death mechanisms and regulationDevelopmental Biology and Gene Regulation

Brn-3a Transcription Factor Blocks p53-mediated Activation of Proapoptotic Target Genes Noxa and Bax in Vitro and in Vivo to Determine Cell Fate

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Hudson, Chantelle D., Morris, Peter J., Latchman, David S., Budhram-Mahadeo, Vishwanie S.·2005·Journal of Biological Chemistry

Abstract

The Brn-3a POU transcription factor is associated with survival and the differentiation of sensory neuronal cells during development. Brn-3a mediates its effects either by the direct regulation of target genes or indirectly upon interaction with proteins such as p53. Brn-3a differentially regulates p53-mediated gene expression and modifies its effect on cell fate. Here we show that, like Bax, Brn-3a antagonizes p53-mediated transcription of another proapoptotic target, Noxa, significantly reducing transactivation of the Noxa promoter by p53. This effect requires the p53 binding site, and electrophoretic mobility shift assay studies suggest that Brn-3a is associated with p53 when it is bound to its site in the Noxa promoter. The wild type but not the mutant promoter can be immunoprecipitated with Brn-3a in chromatin immunoprecipitation assays. Thus, Brn-3a may act by preventing the recruitment of cofactors required for p53 to transactivate this promoter. The co-expression of Brn-3a and p53 results in decreased endogenous Noxa protein in the neuronal cell line, ND7, suggesting a direct functional effect of this interaction. Moreover, there is a significant elevation of both proapoptotic Bax and Noxa proteins in sensory neuronal tissue taken from Brn-3a-/- embryos during development, compared with wild type controls. Striking changes occurred at embryonic day 14.5, a time that precedes a significant loss of specific neurons in the mutant embryos, but not at embryonic day 16.5 when Brn-3a-expressing cells are already lost by apoptosis. Therefore, the lack of antagonism by Brn-3a on activation of proapoptotic p53 target genes may contribute to the increased apoptosis seen in the Brn-3a-/- embryos. These results support a crucial role for Brn-3a in determining the pathway taken by p53 when co-expressed during development and thus in controlling the fate of these cells.

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  • Several proapoptotic BCL-2 family members, including BAX, BBC3 (PUMA) and PMAIP1 (NOXA), are activated by p53.

    “Several proapoptotic BCL-2 family members, including BAX,41, 42, 43 BBC3 (PUMA)181 and PMAIP1 (NOXA),182 are activated by p53.”

    From Census and evaluation of p53 target genes (2017) · cites this paper as [182]

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  1. Gerrero, M. R., McEvilly, R. J., Turner, E., Lin, C. R., O'Connell, S., Jenne, K. J., Hobbs, M. V., and Rosenfeld, M. G. (1993) Proc. Natl. Acad. Sci.
  2. Xiang, M., Gan, L., Zhou, L., Klein, W. H., and Nathans, J. (1996) Proc. Natl. Acad. Sci. U. S. A. 93, 11950 -11955
  3. Gorman C. M. (1985) in DNA Cloning: A Practical Approach (Glover, D. M., ed) pp. 143-190, IRL Press, Oxford

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Authors
Hudson, C. D., Morris, P. J., Latchman, D. S., & Budhram-Mahadeo, V. S.
Affiliations
University College London (GB)
Corresponding author
Budhram-Mahadeo, Vishwanie S.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2005-03
Volume
280
Issue
12
Pages
11851-11858
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2089642386
Cited by
68
References
37
Citations by year
2025: 1 · 2024: 2 · 2023: 2 · 2022: 1 · 2021: 4 · 2020: 6 · 2019: 4 · 2018: 2 · 2017: 3 · 2016: 2 · 2015: 3 · 2014: 4 · 2013: 3 · 2012: 4
FWCI
1.28
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
  • Great Ormond Street Hospital Charity
  • Terry Fox Foundation
  • Directorate for Biological Sciences
  • Biotechnology and Biological Sciences Research Council
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
Keywords
Brn3a, POU transcription factors, p53, Noxa, Bax, apoptosis, sensory neurons, neuronal differentiation, transcriptional repression, p53 binding sites, cell fate determination
MeSH terms
Animals, Binding Sites, Cell Line, DNA, DNA-Binding Proteins, Gene Expression Regulation, Neurons, Promoter Regions, Genetic, Transcription Factors, Tumor Suppressor Protein p53, Apoptosis, Proto-Oncogene Proteins c-bcl-2, Chromatin Immunoprecipitation, Transcription Factor Brn-3, Transcription Factor Brn-3A, bcl-2-Associated X Protein, Mice

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