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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
Novel isatin-derived molecules activate p53 via interference with Mdm2 to promote apoptosis
Olga Fedorova1, Alexandra Daks1, Varvara Petrova2
1a Gene Expression Programme , Institute of Cytology , Saint-Petersburg , Russia.
Abstract:
The p53 protein is a key tumor suppressor in mammals. In response to various forms of genotoxic stress p53 stimulates expression of genes whose products induce cell cycle arrest and/or apoptosis. An E3-ubiquitin ligase, Mdm2 (mouse-double-minute 2) and its human ortholog Hdm2, physically interact with the amino-terminus of p53 to mediate its ubiquitin-mediated degradation via the proteasome. Thus, pharmacological inhibition of the p53-Mdm2 interaction leads to overall stabilization of p53 and stimulation of its anti-tumorigenic activity. In this study we characterize the biological effects of a novel class of non-genotoxic isatin Schiff and Mannich base derivatives (ISMBDs) that stabilize p53 on the protein level. The likely mechanism behind their positive effect on p53 is mediated via the competitive interaction with Mdm2. Importantly, unlike Nutlin, these compounds selectively promoted p53-mediated cell death. These novel pharmacological activators of p53 can serve as valuable molecular tools for probing p53-positive tumors and set up the stage for development of new anti-cancer drugs.
Insights
Novel isatin derivatives stabilize the tumor suppressor p53 (protein 53) by inhibiting Mdm2, enhancing its anti-cancer activity. These compounds selectively promote cancer cell death, offering new therapeutic potential.
Area of Science:
- Oncology
- Molecular Biology
- Pharmacology
Background:
- The p53 protein is a crucial tumor suppressor in mammals.
- Mdm2 (mouse-double-minute 2) targets p53 for degradation, limiting its anti-cancer functions.
- Inhibiting the p53-Mdm2 interaction stabilizes p53 and enhances its tumor-suppressing activity.
Purpose of the Study:
- To investigate the biological effects of novel isatin Schiff and Mannich base derivatives (ISMBDs).
- To determine if ISMBDs can stabilize p53 protein levels.
- To explore the potential of ISMBDs as anti-cancer agents.
Main Methods:
- Characterization of the biological effects of ISMBDs.
- Assessment of p53 protein stabilization.
- Investigation of the mechanism of action, focusing on Mdm2 interaction.
- Evaluation of selective cancer cell death induction.
Main Results:
- ISMBDs were found to stabilize p53 protein levels.
- The mechanism likely involves competitive inhibition of the p53-Mdm2 interaction.
- Unlike Nutlin, these compounds selectively induced p53-mediated cell death in cancer cells.
- ISMBDs demonstrated potential as pharmacological activators of p53.
Conclusions:
- Novel non-genotoxic ISMBDs effectively stabilize p53 protein.
- These compounds offer a new strategy for targeting p53-positive tumors.
- ISMBDs represent promising candidates for the development of novel anti-cancer therapeutics.
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