Activation of p53 by the MDM2 inhibitor RG7112 impairs thrombopoiesis
Open accessAbstract
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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Iancu-Rubin et al. evaluated the impact of the nutlin3-derivative RG7112 on thrombopoiesis because this has been a dose-limiting toxicity in clinical trials.
“Iancu-Rubin et al. evaluated the impact of the nutlin3-derivative RG7112 on thrombopoiesis because this has been a dose-limiting toxicity in clinical trials.18”
From Combination therapy in a xenograft model of glioblastoma: Enhancement of the antitumor activity of temozolomide by an MDM2 antagonist (2017) · cites this paper as [18]
Administration of RG7112 for 10 days decreased platelet production in rats and monkeys, but the effects were reversible.
“Administration of RG7112 for 10 days decreased platelet production in rats and monkeys, but the effects were reversible.”
From Combination therapy in a xenograft model of glioblastoma: Enhancement of the antitumor activity of temozolomide by an MDM2 antagonist (2017) · cites this paper as [18]
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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
- bronze
- doi.org
- Licence
- 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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