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Reaching the point-of-no-return: The cornerstone of glioblastoma treatment?
Montse Alemany1,2, Jordi Bruna2, Victor J Yuste1
1Cell Death, Senescence and Survival Group, Departament de Bioquímica i Biologia Molecular and Institut de Neurociències, Facultat de Medicina, Universitat Autònoma de Barcelona, Campus de Bellaterra, Bellaterra, Spain.
Abstract:
The activation of cellular death programs does not necessarily predetermine an inevitable outcome. Identifying the precise moment when a cell irreversibly transitions from life to death presents a significant challenge in its assessment and measurement. In this review, we explore the critical alterations in cellular structures that have been proposed as the point-of-no-return. Using glioblastoma as a model-one of the most aggressive and lethal tumor types with a remarkable ability to evade cell death-we highlight the challenge of reaching the point-of-no-return. Glioblastoma cells often exhibit impaired function of the apoptotic endonuclease, DFF40/CAD/CPAN, leading to incomplete apoptosis and genomic instability. The sublethal activation of DFF40/CAD/CPAN not only allows tumor cells to survive but can also drive more aggressive phenotypes and enhance therapeutic resistance. We underscore the need to reassess glioblastoma treatment strategies from broad cytotoxic approaches to more targeted therapies that exploit specific vulnerabilities within regulated cell death (RCD) pathways.
Insights
Determining the exact point of irreversible cell death is challenging. In glioblastoma, impaired DFF40/CAD/CPAN function leads to incomplete apoptosis, driving tumor aggressiveness and resistance.
Area of Science:
- Oncology
- Cell Biology
- Molecular Biology
Background:
- Cellular death programs are complex and their outcomes not always predetermined.
- Identifying the irreversible transition point from life to death (point-of-no-return) is a significant challenge.
- Glioblastoma, an aggressive cancer, exhibits a remarkable ability to evade cell death mechanisms.
Purpose of the Study:
- To explore critical cellular alterations proposed as the point-of-no-return.
- To use glioblastoma as a model to highlight challenges in reaching this irreversible cell death point.
- To underscore the need for revised glioblastoma treatment strategies.
Main Methods:
- Review of cellular structural alterations associated with the point-of-no-return.
- Analysis of glioblastoma cell death evasion mechanisms.
- Investigation of the role of DFF40/CAD/CPAN in glioblastoma apoptosis and genomic instability.
Main Results:
- Glioblastoma cells often display impaired DFF40/CAD/CPAN function, resulting in incomplete apoptosis.
- Sublethal activation of DFF40/CAD/CPAN contributes to tumor cell survival and genomic instability.
- Impaired DFF40/CAD/CPAN activity can promote more aggressive tumor phenotypes and therapeutic resistance.
Conclusions:
- Targeting the point-of-no-return in glioblastoma requires understanding sublethal DFF40/CAD/CPAN activation.
- Revised treatment strategies should move beyond broad cytotoxicity towards exploiting regulated cell death (RCD) pathway vulnerabilities.
- Targeted therapies are needed to overcome glioblastoma's resistance and aggressive nature by addressing specific RCD pathway defects.
