Programmed Cell Death Mechanisms in Cancer Systems

Programmed cell death encompasses several regulated pathways—apoptosis, necroptosis, pyroptosis, autophagy-related cell death and ferroptosis—that maintain tissue homeostasis and serve as intrinsic barriers to tumourigenesis. In cancer systems, dysregulation of these pathways underpins malignant transformation, tumour progression and therapeutic resistance. The intrinsic apoptotic cascade is governed by p53, BCL-2 family proteins and caspases, whereas the extrinsic route is initiated through death receptors. Necroptosis and pyroptosis elicit pro-inflammatory signals that shape the tumour microenvironment, offering novel immunotherapeutic opportunities. Autophagy regulates organelle turnover and stress adaptation, with context-dependent roles in either promoting survival under nutrient deprivation or facilitating cell death in response to anticancer agents. Emerging evidence also implicates ferroptosis—an iron-catalysed lipid peroxidation process—as a targetable vulnerability in resistant malignancies. Harnessing these intersecting death circuits informs precision oncology strategies and supports the development of combinatorial treatments that restore cell death programmes in cancer cells.

Research from Nature Portfolio

Recent studies have revealed that programmed cell death 5 (PDCD5) acts as a critical co-factor in p53-driven genotoxic stress responses by mediating dissociation and proteasomal degradation of histone deacetylase 3, thereby enhancing p53 acetylation and apoptotic induction. Complementary work has identified the serine/threonine phosphatase PPEF-1 as a negative regulator of PDCD5 stability; dephosphorylation of PDCD5 by PPEF-1 diminishes p53 activation and fosters chemoresistance in lung carcinoma models. These findings elucidate a dynamic regulatory axis governing apoptosis in cancer cells and pinpoint modulators that may be exploited to sensitise tumours to genotoxic therapies.

Programmed Cell Death Mechanisms in Cancer Systems publication trend

The graph below shows the total number of articles in programmed cell death mechanisms in cancer systems across all publications each year (not limited to Nature Index journals).

Technical terms

Apoptosis: Programmed cell death involving caspase activation, chromatin condensation and membrane blebbing.

Necroptosis: Regulated necrotic death mediated by RIPK1/RIPK3 signalling and MLKL activation.

Pyroptosis: Inflammatory cell death executed by gasdermin pore formation upon inflammasome activation.

Autophagy: Lysosome-dependent degradation of cellular components for homeostatic renewal or cell death.

Ferroptosis: Iron-dependent lipid peroxidation-driven cell death distinct from apoptosis.

PDCD5: A proapoptotic protein that modulates p53 activity and histone deacetylase interactions.

PPEF-1: A serine/threonine phosphatase that regulates PDCD5 stability and apoptotic signalling.

Ubiquitin–proteasome system: A pathway for selective protein degradation via ubiquitin tagging and proteasomal proteolysis.

References

1. Programmed cell death 5 mediates HDAC3 decay to promote genotoxic stress response. Nature Communications (2015).
2. Protein serine/threonine phosphatase PPEF-1 suppresses genotoxic stress response via dephosphorylation of PDCD5. Scientific Reports (2017).
3. PDCD5 transfection increases cisplatin sensitivity and decreases invasion in hepatic cancer cells. Oncology Letters (2014).
4. Cellular Uptake of Exogenous Human PDCD5 Protein*. Journal of Biological Chemistry (2006).