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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
Pharmacologic activation of wild-type p53 by nutlin therapy in childhood cancer
Tom Van Maerken1, Ali Rihani1, Alan Van Goethem1
1Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium.
Abstract:
A peculiar feature of several types of childhood cancer is that loss-of-function mutations of the TP53 (p53) tumor suppressor gene are uncommon, in contrast to many adult tumors. As p53 needs to be inactivated in order for tumor cells to survive and thrive, pediatric tumors typically make use of other mechanisms to keep p53 in check. One of the critical negative regulators of p53 is the MDM2 oncoprotein. Many anticancer drug development efforts in the past decade have therefore been devoted to the discovery and optimization of small molecules that selectively disrupt the interaction between MDM2 and p53, which could provide, in principle, a potent means to restore p53 function in tumor cells with wild-type p53. The nutlins are the class of selective inhibitors of the p53-MDM2 interaction that are currently most advanced in their clinical development. We review here the preclinical data that support the potential therapeutic use of nutlin drugs in the treatment of various pediatric tumors, including neuroblastoma, retinoblastoma, osteosarcoma, Ewing's sarcoma, rhabdomyosarcoma, medulloblastoma, and childhood acute lymphoblastic leukemia.
Insights
Pediatric tumors often avoid TP53 (p53) mutations by inhibiting p53 activity. Nutlin drugs, which block the p53-MDM2 interaction, show promise for treating various childhood cancers by restoring p53 function.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- Childhood cancers rarely exhibit TP53 (p53) tumor suppressor gene mutations, unlike many adult tumors.
- Pediatric tumors employ alternative mechanisms to inactivate p53, crucial for tumor cell survival.
- The MDM2 oncoprotein is a key negative regulator of p53 activity.
Purpose of the Study:
- To review preclinical data on nutlin drugs as potential therapeutics for pediatric cancers.
- To highlight the role of MDM2-p53 interaction inhibitors in restoring wild-type p53 function.
Main Methods:
- Review of preclinical studies on nutlin drugs.
- Analysis of nutlin's efficacy in various pediatric tumor models.
Main Results:
- Nutlin drugs selectively inhibit the p53-MDM2 interaction.
- Preclinical data support the therapeutic potential of nutlins in diverse pediatric malignancies.
- Nutlins offer a strategy to reactivate p53 in tumors with wild-type p53.
Conclusions:
- Nutlin drugs represent a promising therapeutic strategy for pediatric cancers.
- Targeting the p53-MDM2 interaction with nutlins could restore tumor suppressor function.
- Further investigation into nutlin drugs for neuroblastoma, retinoblastoma, and other pediatric tumors is warranted.
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