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New UCI-led study reveals computation-guided approach to suppressing cancer tumor growth

Headshot of Peter Kaiser
UCI School of Medicine
Peter Kaiser, UCI School of Medicine, Department of Biological Chemistry and Chao Family Comprehensive Cancer Center.

Research holds promise for the development of pharmacological therapies

Irvine, CA – Aug. 10, 2022 – A new study, led by researchers from the University of California, Irvine and the University of California, San Diego, reveals a new computation-guided approach to identify small molecules that can restore aspects of wild-type p53 tumor suppression function to mutated p53, which play an important role in many human cancers. This approach was successful both in vitro and in vivo. This strategy can increase chemical diversity of p53 corrector molecules for clinical development.

 The tumor suppressor p53 is one of the most powerful mechanisms organisms use to protect themselves from cancer. Elephants have multiple copies of the p53 gene and rarely get cancer. Humans have only one copy and it is the most mutated gene found in human cancer. Diverse therapeutic approaches are actively pursued to target this pathway.

“Interestingly, a large fraction of p53 alterations are missense mutations, where the genetic code of the p53 is altered in a way that produces a different amino acid than it would normally,” explained Peter Kaiser, PhD, professor and chair of the Department of Biological Chemistry at the UCI School of Medicine.  “This results in abundance of mutant p53 protein levels in tumors that are, in principle, amenable to a corrector drug approach.”

Published in Cell Chemical Biology, the study identified small drug-like compounds that act through a well-defined mode of action; do not require covalent attachment, induction of redox imbalance, or metal binding; and have selective anti-cancer activities on tumors with p53 missense mutations. This research provides a framework for p53 reactivation compound discovery that can help to increase chemical diversity and improve pharmacological properties necessary for translation of pharmaceutical p53 mutant reactivation to the clinic.

“This study successfully demonstrates the feasibility and efficacy of pharmaceutical reactivation of mutant p53,” said Kaiser. “These findings are encouraging given the large number of cancer patients with p53 mutations that could benefit from such drugs.”

This study involved the application of an ensemble-based virtual screening approach, developed in the laboratory of Rommie Amaro, professor and endowed chair in the Department of Chemistry and Biochemistry at UC San Diego, which has the potential to identify compounds with increased cancer killing potential and with a broad spectrum of activity across a panel of p53 mutants. The researchers showed that their compounds bind mutant p53 and change mutant p53 conformation to wild type-like structures. This restores p53 DNA binding activity to activate the p53 transcriptional response, which in turn prevents tumor progression in mouse models selectively for tumors with a p53 missense mutation.

Challenges remain to define exact mechanisms and develop highly active corrector drugs for mutated p53 and future experiments are needed to optimize pharmacological properties to progress towards clinical therapeutics.

The study was supported by the National Institutes of Health and the Department of Defense. 

About the UCI School of Medicine: Each year, the UCI School of Medicine educates more than 400 medical students, and nearly 150 doctoral and master’s students. More than 700 residents and fellows are trained at UCI Medical Center and affiliated institutions. The School of Medicine offers an MD; a dual MD/PhD medical scientist training program; and PhDs and master’s degrees in anatomy and neurobiology, biomedical sciences, genetic counseling, epidemiology, environmental health sciences, pathology, pharmacology, physiology and biophysics, and translational sciences. Medical students also may pursue an MD/MBA, an MD/master’s in public health, or an MD/master’s degree through one of three mission-based programs: the Health Education to Advance Leaders in Integrative Medicine (HEAL-IM), the Leadership Education to Advance Diversity-African, Black and Caribbean (LEAD-ABC), and the Program in Medical Education for the Latino Community (PRIME-LC). The UCI School of Medicine is accredited by the Liaison Committee on Medical Accreditation and ranks among the top 50 nationwide for research. For more information, visit som.uci.edu.

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