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Discussion of some 'knowns' and some 'unknowns' about the tumour suppressor p53
Elizabeth Lieschke1,2, Zilu Wang1,2, Gemma L Kelly1,2
1The Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia.
Abstract:
Activation of the tumour suppressor p53 upon cellular stress can induce a number of different cellular processes. The diverse actions of these processes are critical for the protective function of p53 in preventing the development of cancer. However, it is still not fully understood which process(es) activated by p53 is/are critical for tumour suppression and how this might differ depending on the type of cells undergoing neoplastic transformation and the nature of the drivers of oncogenesis. Moreover, it is not clear why upon activation of p53 some cells undergo cell cycle arrest and senescence whereas others die by apoptosis. Here we discuss some of the cellular processes that are crucial for p53-mediated tumour suppression and the factors that could impact cell fate upon p53 activation. Finally, we describe therapies aimed either at activating wild-type p53 or at changing the behaviour of mutant p53 to unleash tumour growth suppressive processes for therapeutic benefit in malignant disease.
Insights
The tumor suppressor p53 activates cellular processes to prevent cancer. Understanding which processes are key and why cells respond differently (arrest, senescence, or apoptosis) is crucial for developing targeted cancer therapies.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- The tumor suppressor p53 plays a critical role in preventing cancer by initiating various cellular responses to stress.
- The precise mechanisms by which p53-mediated processes suppress tumors and the factors influencing cell fate (apoptosis vs. cell cycle arrest) remain incompletely understood.
- Variations in cellular transformation drivers and cell types may influence p53's tumor suppressive functions.
Purpose of the Study:
- To elucidate the critical cellular processes driven by p53 essential for tumor suppression.
- To investigate the factors determining cell fate decisions, such as apoptosis or senescence, following p53 activation.
- To review therapeutic strategies targeting wild-type or mutant p53 for cancer treatment.
Main Methods:
- This study is a review and discussion of existing research.
- It synthesizes findings on p53-mediated cellular processes and their role in tumor suppression.
- It analyzes factors influencing cell fate and therapeutic interventions.
Main Results:
- p53 activation triggers diverse cellular processes vital for cancer prevention.
- Cellular context and oncogenic drivers influence which p53-activated pathways are critical for tumor suppression.
- The decision between cell cycle arrest, senescence, or apoptosis upon p53 activation is complex and context-dependent.
Conclusions:
- Identifying the specific p53-dependent processes crucial for tumor suppression in different cancers is key.
- Understanding the determinants of cell fate following p53 activation can guide therapeutic strategies.
- Targeting p53, either by activating wild-type or modifying mutant forms, holds promise for effective cancer therapies.