p53-mediated apoptotic signaling pathway

The p53-mediated apoptotic signaling pathway is a fundamental cellular mechanism responsible for inducing programmed cell death in response to various stressors, including DNA damage, hypoxia, and oncogenic signaling. Centered on the tumor suppressor protein p53, often termed the guardian of the genome, the pathway functions primarily through the transcriptional activation of pro-apoptotic members of the Bcl-2 family, such as BAX, PUMA, and NOXA, as well as the induction of death receptors like DR5. In over half of all human cancers, this pathway is compromised by mutations in the TP53 gene or by the overexpression of negative regulators like MDM2, which facilitates p53 degradation. Therapeutic interventions aim to reactivate this pathway to eliminate malignant cells, utilizing strategies such as MDM2-p53 interaction inhibitors or compounds that restore functional activity to mutant p53. However, the clinical application of these therapies is often limited by dose-limiting toxicities in normal tissues and the rapid evolution of resistance mechanisms within the tumor.

Other names

p53-regulated apoptotic pathwayp53 signaling pathwayp53-dependent apoptosisTP53-mediated apoptotic pathwayp53-mediated apoptotic signaling pathway

The pathway is targeted by inhibiting the MDM2-p53 interaction to stabilize wild-type p53, or by using small molecules to restore the functional conformation of mutant p53 proteins, thereby inducing apoptosis in cancer cells.