Cited by 90Platelet Disorders and TreatmentsCancer-related Molecular PathwaysComplement system in diseases

Activation of p53 by the MDM2 inhibitor RG7112 impairs thrombopoiesis

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Iancu-Rubin, Camelia, Mosoyan, Goar, Glenn, Kelli, Gordon, Ronald E., Nichols, Gwen L., Hoffman, Ronald·2014·Experimental Hematology

Abstract

The tumor suppressor p53 is thought to play a role in megakaryocyte (MK) development. To assess the influence of the p53 regulatory pathway further, we studied the effect of RG7112, a small molecule MDM2 antagonist that activates p53 by preventing its interaction with MDM2, on normal megakaryocytopoiesis and platelet production. This drug has been previously been evaluated in clinical trials of cancer patients where thrombocytopenia was one of the major dose-limiting toxicities. In this study, we demonstrated that administration of RG7112 in vivo in rats and monkeys results in thrombocytopenia. In addition, we identified two distinct mechanisms by which RG7112-mediated activation of p53 affected human megakaryocytopoiesis and platelet production in vitro. RG7112 promoted apoptosis of MK progenitor cells, resulting in a reduction of their numbers and RG7112 affected mature MK by blocking DNA synthesis during endomitosis and impairing platelet production. Together, the disruption of these events provides an explanation for RG7112-induced thrombocytopenia and insight into the role of the p53-MDM2 auto-regulatory loop in normal megakaryocytopoiesis.

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Crossref · 10.1016/j.exphem.2013.11.012

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Authors
Iancu-Rubin, C., Mosoyan, G., Glenn, K., Gordon, R. E., Nichols, G. L., & Hoffman, R.
Affiliations
  • Tisch Cancer Institute (US)
  • F. Hoffmann-La Roche AG (CH)
  • Icahn School of Medicine at Mount Sinai (US)
Venue
Experimental Hematology
Publisher
Elsevier BV
Published
2014-02
Volume
42
Issue
2
Pages
137-145.e5
ISSN
0301-472X (ISSN-L)
OpenAlex
W1993964347
Cited by
90
References
33
Citations by year
2026: 5 · 2025: 9 · 2024: 9 · 2023: 8 · 2022: 7 · 2021: 4 · 2020: 9 · 2019: 5 · 2018: 5 · 2017: 7 · 2016: 10 · 2015: 9 · 2014: 3
FWCI
5.50
Type
journal article
Language
en
Open access
Locations
  • Experimental Hematology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • F. Hoffmann-La Roche
  • National Cancer Institute (P01CA108671)
Topics
  • Health Sciences › Medicine › Hematology › Platelet Disorders and Treatments
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
Keywords
RG7112, p53 activation, MDM2 inhibitors, megakaryopoiesis, thrombocytopenia, megakaryocyte apoptosis, endomitosis, drug-induced thrombocytopenia
MeSH terms
Animals, Antineoplastic Agents, Female, Humans, Male, Platelet Count, Tumor Suppressor Protein p53, Thrombopoiesis, Imidazolines, Mice, Proto-Oncogene Proteins c-mdm2

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