Cited by 368Cell death mechanisms and regulationCancer-related Molecular PathwaysMitochondrial Function and Pathology

p73 Induces apoptosis via PUMA transactivation and Bax mitochondrial translocation

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Melino, Gerry, Bernassola, Francesca, Ranalli, Marco, Yee, Karen, Zong, Wei Xing, Corazzari, Marco, Knight, Richard A., Green, Doug R. +2 more·2004·Journal of Biological Chemistry

Abstract

p73, an important developmental gene, shares a high sequence homology with p53 and induces both G(1) cell cycle arrest and apoptosis. However, the molecular mechanisms through which p73 induces apoptosis are unclear. We found that p73-induced apoptosis is mediated by PUMA (p53 up-regulated modulator of apoptosis) induction, which, in turn, causes Bax mitochondrial translocation and cytochrome c release. Overexpression of p73 isoforms promotes cell death and bax promoter transactivation in a time-dependent manner. However, the kinetics of apoptosis do not correlate with the increase of Bax protein levels. Instead, p73-induced mitochondrial translocation of Bax is kinetically compatible with the induction of cell death. p73 is localized in the nucleus and remains nuclear during the induction of cell death, indicating that the effect of p73 on Bax translocation is indirect. The ability of p73 to directly transactivate PUMA and the direct effect of PUMA on Bax conformation and mitochondrial relocalization suggest a molecular link between p73 and the mitochondrial apoptotic pathway. Our data therefore indicate that PUMA-mediated Bax mitochondrial translocation, rather than its direct transactivation, correlates with cell death. Finally, human DeltaNp73, an isoform lacking the amino-terminal transactivation domain, inhibits TAp73-induced as well as p53-induced apoptosis. The DeltaNp73 isoforms seem therefore to act as dominant negatives, repressing the PUMA/Bax system and, thus, finely tuning p73-induced apoptosis. Our findings demonstrate that p73 elicits apoptosis via the mitochondrial pathway using PUMA and Bax as mediators.

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Crossref · 10.1074/jbc.m307469200

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Authors
Melino, G., Bernassola, F., Ranalli, M., Yee, K., Zong, W. X., Corazzari, M., Knight, R. A., Green, D. R., Thompson, C., & Vousden, K. H.
Affiliations
  • University of Rome Tor Vergata (IT)
  • Cancer Research UK Scotland Institute (GB)
  • University of Pennsylvania (US)
  • Imperial College London (GB)
Corresponding author
Melino, Gerry
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2004-02
Volume
279
Issue
9
Pages
8076-8083
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2084708321
Cited by
368
References
45
Citations by year
2026: 2 · 2025: 6 · 2024: 5 · 2023: 9 · 2022: 7 · 2021: 9 · 2020: 6 · 2019: 10 · 2018: 10 · 2017: 17 · 2016: 13 · 2015: 14 · 2014: 18 · 2013: 31 · 2012: 22
FWCI
10.06
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • ENLIGHTEN (Jurnal Bimbingan dan Konseling Islam) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
p73, apoptosis, PUMA, Bax, mitochondrial translocation, cytochrome c release, mitochondrial apoptosis, p73 isoforms, ΔNp73, dominant negative regulation, transcriptional activation, p53 homolog
MeSH terms
Tumor Protein p73, Animals, Biological Transport, Cell Line, Cytosol, DNA-Binding Proteins, HeLa Cells, Humans, Kinetics, Luciferases, Mitochondria, Nuclear Proteins, Promoter Regions, Genetic, Proto-Oncogene Proteins, RNA Splicing, Transfection, Transcriptional Activation, Gene Expression, Genes, Tumor Suppressor, Tumor Suppressor Protein p53, Apoptosis, Mice, Knockout, Proto-Oncogene Proteins c-bcl-2, Protein Isoforms, Tumor Suppressor Proteins, Cytochromes c, Apoptosis Regulatory Proteins, bcl-2-Associated X Protein, Mice, DNA Fragmentation

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