Cited by 260Cancer-related Molecular PathwaysHeat shock proteins researchCell death mechanisms and regulation

Mdm4 and Mdm2 cooperate to inhibit p53 activity in proliferating and quiescent cells in vivo

Open access
Francoz, Sarah, Froment, Pascal, Bogaerts, Sven, De Clercq, Sarah, Maetens, Marion, Doumont, Gilles, Bellefroid, Eric, Marine, Jean-Christophe·2006·Proceedings of the National Academy of Sciences

Abstract

The Mdm2 and Mdm4 oncoproteins are key negative regulators of the p53 tumor suppressor. However, their physiological contributions to the regulation of p53 stability and activity remain highly controversial. Here, we combined a p53 knock-in allele, in which p53 is silenced by a transcriptional stop element flanked by loxP sites, with the mdm2 - and mdm4 -null alleles. This approach allows Cre-mediated conditional p53 expression in tissues in vivo and cells in vitro lacking Mdm2, Mdm4, or both. Using this strategy, we show that Mdm2 and Mdm4 are essential in a nonredundant manner for preventing p53 activity in the same cell type, irrespective of the proliferation/differentiation status of the cells. Although Mdm2 prevents accumulation of the p53 protein, Mdm4 contributes to the overall inhibition of p53 activity independent of Mdm2. We propose a model in which Mdm2 is critical for the regulation of p53 levels and Mdm4 is critical for the fine-tuning of p53 transcriptional activity, both proteins acting synergistically to keep p53 in check.

Integrity signals

Registry

Crossref · 10.1073/pnas.0508476103

Cites

34 of 34 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

We couldn’t retrieve this paper’s full text, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Mdm4 directly interacts with p53 to disrupt its DNA-binding and transcriptional activation.

    “Further, Mdm4 directly interacts with p53 to disrupts its DNA-binding and transcriptional activation (Francoz et al., 2006; Wei et al., 2016).”

    From USP7 Is a Master Regulator of Genome Stability (2020) · cites this paper as Francoz et al., 2006

  • Mdm2 and Mdmx contribute to p53 regulation to different extents in different tissues in vivo.

    “Mdm2 and Mdmx seem to contribute to p53 regulation to different extents in different tissues in vivo (Table 1; [32–40]).”

    From The p53 orchestra: Mdm2 and Mdmx set the tone (2010) · cites this paper as [33]

  • In some tissues and cell types, such as the central nervous system and proliferative intestinal cells, there is a requirement for both Mdm2 and Mdmx.

    “Clearly in some tissues and cell types [such as the central nervous system (CNS) and proliferative intestinal cells], there is a requirement for both Mdm2 and Mdmx.”

    From The p53 orchestra: Mdm2 and Mdmx set the tone (2010) · cites this paper as [33]

  • In smooth muscle cells, loss of Mdmx has no phenotype.

    “However, in other cases, such as smooth muscle cells, loss of Mdmx has no phenotype.”

    From The p53 orchestra: Mdm2 and Mdmx set the tone (2010) · cites this paper as [33]

  • Proliferating cells are more sensitive than resting cells to MDM2 and MDMX depletion.

    “Proliferating cells are more sensitive than resting cells to MDM2 and MDMX depletion24.”

    From MDM2, MDMX and p53 in oncogenesis and cancer therapy (2013) · cites this paper as [24]

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Francoz, S., Froment, P., Bogaerts, S., De Clercq, S., Maetens, M., Doumont, G., Bellefroid, E., & Marine, J.-C.
Affiliations
  • Université Libre de Bruxelles (BE)
  • Vlaams Instituut voor Biotechnologie (BE)
  • Laboratory for Molecular Cancer Biology, Flanders Interuniversity Institute for Biotechnology, University of Ghent, B-9052 Ghent, Belgium; and
Venue
Proceedings of the National Academy of Sciences
Published
2006-02-21
Volume
103
Issue
9
Pages
3232-3237
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1994169350
Cited by
260
References
34
Citations by year
2026: 4 · 2025: 7 · 2024: 10 · 2023: 11 · 2022: 9 · 2021: 11 · 2020: 7 · 2019: 7 · 2018: 9 · 2017: 14 · 2016: 14 · 2015: 6 · 2014: 16 · 2013: 16 · 2012: 21
FWCI
11.65
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, other-oa)
  • Ghent University Academic Bibliography (Ghent University) (submittedVersion)
  • Dépôt institutionnel de l'Université libre de Bruxelles (Université Libre de Bruxelles) (submittedVersion)
Funders
  • Massachusetts Institute of Technology
  • European Commission
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
MDM2, MDM4, p53, p53 regulation, p53 stabilization, p53 transcriptional activity, knockout mice, cell proliferation, quiescent cells, tumor suppressor
MeSH terms
Animals, Fibroblasts, Neurons, Proto-Oncogene Proteins, Stem Cells, Tumor Suppressor Protein p53, Mice, Knockout, Gene Expression Regulation, Developmental, Ubiquitin-Protein Ligases, Cell Proliferation, Mice, Proto-Oncogene Proteins c-mdm2

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review