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Updated: Jun 26, 2026

Testing Targeted Therapies in Cancer using Structural DNA Alteration Analysis and Patient-Derived Xenografts
Published on: July 25, 2020
Targeting Mdm2 and Mdmx in cancer therapy: better living through medicinal chemistry?
1Gene Expression Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
Abstract:
Genomic and proteomic profiling of human tumor samples and tumor-derived cell lines are essential for the realization of personalized therapy in oncology. Identification of the changes required for tumor initiation or maintenance will likely provide new targets for small-molecule and biological therapeutics. For example, inactivation of the p53 tumor suppressor pathway occurs in most human cancers. Although this can be due to frank p53 gene mutation, almost half of all cancers retain the wild-type p53 allele, indicating that the pathway is disabled by other means. Alternate mechanisms include deletion or epigenetic inactivation of the p53-positive regulator arf, methylation of the p53 promoter, or elevated expression of the p53 regulators Mdm2 and Mdmx. This review discusses current models of p53 regulation by Mdm2 and Mdmx and presents the rationale for design of future Mdmx-specific therapeutics based on our knowledge of its structure and biological functions.
Insights
Personalized cancer therapy relies on understanding tumor genetics. This review explores p53 pathway dysregulation by Mdm2 and Mdmx, highlighting Mdmx as a target for new cancer therapeutics.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Genomic and proteomic profiling of tumors is crucial for personalized cancer therapy.
- The p53 tumor suppressor pathway is frequently inactivated in human cancers.
- Inactivation can occur despite wild-type p53, through mechanisms like Mdm2 and Mdmx regulation.
Purpose of the Study:
- To review current models of p53 regulation by Mdm2 and Mdmx.
- To present the rationale for developing Mdmx-specific therapeutics.
- To identify new therapeutic targets in oncology.
Main Methods:
- Literature review of p53 pathway regulation.
- Analysis of Mdm2 and Mdmx roles in cancer.
- Examination of Mdmx structure and function.
Main Results:
- p53 pathway inactivation is a hallmark of cancer.
- Mdm2 and Mdmx are key regulators of p53.
- Mdmx presents a promising target for novel therapeutics.
Conclusions:
- Understanding p53 regulation by Mdm2 and Mdmx is vital for cancer treatment.
- Targeting Mdmx offers a potential strategy for developing new anti-cancer drugs.
- Further research into Mdmx structure and function can guide therapeutic design.
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