Cited by 89Cancer-related Molecular PathwaysCell death mechanisms and regulationHeat shock proteins research

Dose and Schedule Determine Distinct Molecular Mechanisms Underlying the Efficacy of the p53–MDM2 Inhibitor HDM201

Jeay, Sébastien, Ferretti, Stéphane, Holzer, Philipp, Fuchs, Jeanette, Chapeau, Emilie A., Wartmann, Markus, Sterker, Dario, Romanet, Vincent +19 more·2018·Cancer Research

Published version of a preprint

Abstract

Activation of p53 by inhibitors of the p53–MDM2 interaction is being pursued as a therapeutic strategy in p53 wild-type cancers. Here, we report distinct mechanisms by which the novel, potent, and selective inhibitor of the p53–MDM2 interaction HDM201 elicits therapeutic efficacy when applied at various doses and schedules. Continuous exposure of HDM201 led to induction of p21 and delayed accumulation of apoptotic cells. By comparison, high-dose pulses of HDM201 were associated with marked induction of PUMA and a rapid onset of apoptosis. shRNA screens identified PUMA as a mediator of the p53 response specifically in the pulsed regimen. Consistent with this, the single high-dose HDM201 regimen resulted in rapid and marked induction of PUMA expression and apoptosis together with downregulation of Bcl-xL in vivo. Knockdown of Bcl-xL was identified as the top sensitizer to HDM201 in vitro, and Bcl-xL was enriched in relapsing tumors from mice treated with intermittent high doses of HDM201. These findings define a regimen-dependent mechanism by which disruption of MDM2–p53 elicits therapeutic efficacy when given with infrequent dosing. In an ongoing HDM201 trial, the observed exposure–response relationship indicates that the molecular mechanism elicited by pulse dosing is likely reproducible in patients. These data support the clinical comparison of daily and intermittent regimens of p53–MDM2 inhibitors. Significance: Pulsed high doses versus sustained low doses of the p53-MDM2 inhibitor HDM201 elicit a proapoptotic response from wild-type p53 cancer cells, offering guidance to current clinical trials with this and other drugs that exploit the activity of p53. Cancer Res; 78(21); 6257–67. ©2018 AACR.

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Crossref · 10.1158/0008-5472.can-18-0338

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Authors
Jeay, S., Ferretti, S., Holzer, P., Fuchs, J., Chapeau, E. A., Wartmann, M., Sterker, D., Romanet, V., Murakami, M., Kerr, G., Durand, E. Y., Gaulis, S., Cortes-Cros, M., Ruetz, S., Stachyra, T.-M., Kallen, J., Furet, P., Würthner, J., Guerreiro, N., Halilovic, E., Jullion, A., Kauffmann, A., Kuriakose, E., Wiesmann, M., Jensen, M. R., Hofmann, F., & Sellers, W. R.
Affiliations
  • Novartis (Switzerland) (CH)
  • 1Disease Area Oncology, Novartis Institutes for BioMedical Research, Basel, Switzerland.
  • Novartis Institutes for BioMedical Research (CH)
  • 7Oncology Global Development, Basel, Switzerland.
  • 8Translational Clinical Oncology, Novartis Institutes for BioMedical Research, East Hanover, New Jersey.
  • 9Disease Area Oncology, Novartis Institutes for BioMedical Research, Cambridge, Massachusetts.
Corresponding author
  • Ferretti, Stéphane
  • Hofmann, Francesco
Venue
Cancer Research
Published
2018-11-01
Volume
78
Issue
21
Pages
6257-6267
ISSN
  • 0008-5472 (ISSN-L)
  • 1538-7445
OpenAlex
W2888012200
Cited by
87
References
50
Citations by year
2026: 4 · 2025: 9 · 2024: 15 · 2023: 13 · 2022: 13 · 2021: 16 · 2020: 6 · 2019: 11
FWCI
3.19
Type
journal article
Language
en
Open access
closed
Locations
  • Cancer Research (publishedVersion)
  • PubMed (publishedVersion)
  • DORA PSI (Paul Scherrer Institute) (submittedVersion)
Funders
Novartis
Topics
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
Keywords
p53 activation, dosing regimen, p21, PUMA, Bcl-xL, apoptosis, exposure-response relationship, shRNA screen, relapsed cancer
MeSH terms
Animals, Antineoplastic Agents, Drug Screening Assays, Antitumor, Humans, Imidazoles, Neoplasm Transplantation, Neoplasms, Pyrimidines, Pyrroles, Time Factors, Tumor Suppressor Protein p53, Apoptosis, Area Under Curve, Maximum Tolerated Dose, RNA, Small Interfering, Cell Line, Tumor, Cyclin-Dependent Kinase Inhibitor p21, bcl-X Protein, Mice, Proto-Oncogene Proteins c-mdm2, Kaplan-Meier Estimate

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