p75 Induces Apoptosis via PUMA Transactivation and Bax Mitochondrial Translocation

Gerry Melino, Francesca Bernassola, Marco Ranalli, Karen Yee, Wei-Xing Zong, Marco Corazzari, Richard A. Knight, Doug R. Green, Craig Thompson, Karen H. Vousden

Research output: Contribution to journalArticle

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Abstract

p73, an important developmental gene, shares a high sequence homology with p53 and induces both G1 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 ANp73, an isoform lacking the amino-terminal transactivation domain, inhibits TAp73-induced as well as p53-induced apoptosis. The ANp73 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.

Original languageEnglish (US)
Pages (from-to)8076-8083
Number of pages8
JournalJournal of Biological Chemistry
Volume279
Issue number9
DOIs
StatePublished - Feb 27 2004
Externally publishedYes

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Modulators
Transcriptional Activation
Apoptosis
Cell death
Cell Death
Protein Isoforms
G1 Phase Cell Cycle Checkpoints
Developmental Genes
bcl-2-Associated X Protein
Sequence Homology
Cytochromes c
Conformations
Tuning
Genes
Cells
Kinetics

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Biochemistry
  • Cell Biology

Cite this

Melino, G., Bernassola, F., Ranalli, M., Yee, K., Zong, W-X., Corazzari, M., ... Vousden, K. H. (2004). p75 Induces Apoptosis via PUMA Transactivation and Bax Mitochondrial Translocation. Journal of Biological Chemistry, 279(9), 8076-8083. https://doi.org/10.1074/jbc.M307469200
Melino, Gerry ; Bernassola, Francesca ; Ranalli, Marco ; Yee, Karen ; Zong, Wei-Xing ; Corazzari, Marco ; Knight, Richard A. ; Green, Doug R. ; Thompson, Craig ; Vousden, Karen H. / p75 Induces Apoptosis via PUMA Transactivation and Bax Mitochondrial Translocation. In: Journal of Biological Chemistry. 2004 ; Vol. 279, No. 9. pp. 8076-8083.
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abstract = "p73, an important developmental gene, shares a high sequence homology with p53 and induces both G1 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 ANp73, an isoform lacking the amino-terminal transactivation domain, inhibits TAp73-induced as well as p53-induced apoptosis. The ANp73 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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Melino, G, Bernassola, F, Ranalli, M, Yee, K, Zong, W-X, Corazzari, M, Knight, RA, Green, DR, Thompson, C & Vousden, KH 2004, 'p75 Induces Apoptosis via PUMA Transactivation and Bax Mitochondrial Translocation', Journal of Biological Chemistry, vol. 279, no. 9, pp. 8076-8083. https://doi.org/10.1074/jbc.M307469200

p75 Induces Apoptosis via PUMA Transactivation and Bax Mitochondrial Translocation. / Melino, Gerry; Bernassola, Francesca; Ranalli, Marco; Yee, Karen; Zong, Wei-Xing; Corazzari, Marco; Knight, Richard A.; Green, Doug R.; Thompson, Craig; Vousden, Karen H.

In: Journal of Biological Chemistry, Vol. 279, No. 9, 27.02.2004, p. 8076-8083.

Research output: Contribution to journalArticle

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T1 - p75 Induces Apoptosis via PUMA Transactivation and Bax Mitochondrial Translocation

AU - Melino, Gerry

AU - Bernassola, Francesca

AU - Ranalli, Marco

AU - Yee, Karen

AU - Zong, Wei-Xing

AU - Corazzari, Marco

AU - Knight, Richard A.

AU - Green, Doug R.

AU - Thompson, Craig

AU - Vousden, Karen H.

PY - 2004/2/27

Y1 - 2004/2/27

N2 - p73, an important developmental gene, shares a high sequence homology with p53 and induces both G1 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 ANp73, an isoform lacking the amino-terminal transactivation domain, inhibits TAp73-induced as well as p53-induced apoptosis. The ANp73 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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