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p53 activators and inhibitors act on the tumor suppressor p53, a transcription factor activated by cellular stress. In unstressed cells the ubiquitin ligase mouse double minute 2 (MDM2) keeps p53 levels low by promoting its degradation. RG7112 blocks the p53-MDM2 interaction, and SJ 172550 targets the related protein mouse double minute 4 (MDM4, also called MDMX). RITA binds p53 itself, while tenovin-1 and tenovin-6 raise cellular p53 levels. Tenovin-6 also inhibits the deacetylases sirtuin 1 and sirtuin 2 (SIRT1, SIRT2). Pifithrin-α hydrobromide works the other way, inhibiting p53-dependent transcription in cells exposed to genotoxic stress. Further compounds directed at MDM2 are listed in the neighboring MDM2 category.
MIRA-1 restores wild-type conformation, function and DNA binding activity to mutant p53. Induces p53 transcriptional transactivation of p21, MDM2 and PUMA.
PK7242 is a potent inducer of mutant p53 reactivation, specifically targeting the p53-Y220C variant in cancer cells. This compound promotes growth inhibition, triggers cell-cycle arrest, and initiates apoptosis in tumor cells harboring the Y220C mutation. PK7242 is a valuable tool for investigating therapeutic strategies aimed at targeting p53 deficiencies in cancer research.
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