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Antioxidant Defenses: A Context-Specific Vulnerability of Cancer Cells
Jordan A Cockfield1, Zachary T Schafer2
1Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA.
Abstract:
Reactive oxygen species (ROS) are well known for their capacity to cause DNA damage, augment mutagenesis, and thereby promote oncogenic transformation. Similarly, agents that reduce ROS levels (antioxidants) are frequently thought to have anti-cancer properties given their propensity to minimize DNA damage and mutagenesis. However, numerous clinical studies focused on antioxidants suggest that this is a facile premise and that antioxidant capacity can be important for cancer cells in a similar fashion to normal cells. As a consequence of this realization, numerous laboratories have been motivated to investigate the biological underpinnings explaining how and when antioxidant activity can potentially be beneficial to cancer cells. Relatedly, it has become clear that the reliance of cancer cells on antioxidant activity in certain contexts represents a potential vulnerability that could be exploited for therapeutic gain. Here, we review some of the recent, exciting findings documenting how cancer cells utilized antioxidant activity and under what circumstances this activity could represent an opportunity for selective elimination of cancer cells.
Insights
Antioxidants, often thought to fight cancer, can also support cancer cell survival. Understanding this dual role is key to developing new cancer therapies that target cancer cells
Area of Science:
- Oncology
- Cell Biology
- Biochemistry
Background:
- Reactive oxygen species (ROS) are implicated in DNA damage, mutagenesis, and oncogenesis.
- Antioxidants are traditionally viewed as cancer-preventive due to their ROS-scavenging properties.
- Clinical studies reveal antioxidants can also benefit cancer cells, challenging simplistic anti-cancer roles.
Purpose of the Study:
- To review recent findings on how cancer cells utilize antioxidant activity.
- To explore circumstances where antioxidant activity in cancer cells presents a therapeutic vulnerability.
Main Methods:
- Literature review of recent scientific findings.
- Analysis of biological mechanisms underlying cancer cell antioxidant reliance.
Main Results:
- Cancer cells, like normal cells, can depend on antioxidant systems for survival.
- This reliance can be context-dependent, highlighting a potential therapeutic window.
- Specific conditions reveal antioxidant activity as a vulnerability exploitable for cancer elimination.
Conclusions:
- The role of antioxidants in cancer is complex, not solely protective.
- Targeting cancer cell antioxidant pathways offers a promising strategy for selective cancer therapy.
- Further research into cancer cell antioxidant dependencies can guide novel treatment development.
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