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Updated: Mar 1, 2026
Production and Detection of Reactive Oxygen Species ROS in Cancers
Published on: November 21, 2011
Paradoxical roles of dual oxidases in cancer biology
Andrew C Little1, Arvis Sulovari2, Karamatullah Danyal3
1Department of Pathology and Laboratory Medicine, Robert Larner, M.D. College of Medicine, University of Vermont, Burlington, VT 05405, United States; Cellular, Molecular, and Biomedical Sciences Graduate Program, University of Vermont, Burlington, VT 05405, United States.
Abstract:
Dysregulated oxidative metabolism is a well-recognized aspect of cancer biology, and many therapeutic strategies are based on targeting cancers by altering cellular redox pathways. The NADPH oxidases (NOXes) present an important enzymatic source of biological oxidants, and the expression and activation of several NOX isoforms are frequently dysregulated in many cancers. Cell-based studies have demonstrated a role for several NOX isozymes in controlling cell proliferation and/or cell migration, further supporting a potential contributing role for NOX in promoting cancer. While various NOX isoforms are often upregulated in cancers, paradoxical recent findings indicate that dual oxidases (DUOXes), normally prominently expressed in epithelial lineages, are frequently suppressed in epithelial-derived cancers by epigenetic mechanisms, although the functional relevance of such DUOX silencing has remained unclear. This review will briefly summarize our current understanding regarding the importance of reactive oxygen species (ROS) and NOXes in cancer biology, and focus on recent observations indicating the unique and seemingly opposing roles of DUOX enzymes in cancer biology. We will discuss current knowledge regarding the functional properties of DUOX, and recent studies highlighting mechanistic consequences of DUOX1 loss in lung cancer, and its consequences for tumor invasiveness and current anticancer therapy. Finally, we will also discuss potentially unique roles for the DUOX maturation factors. Overall, a better understanding of mechanisms that regulate DUOX and the functional consequences of DUOX silencing in cancer may offer valuable new diagnostic insights and novel therapeutic opportunities.
Insights
Dual oxidases (DUOXes) are suppressed in epithelial cancers, unlike other NADPH oxidases (NOXes). Understanding DUOX silencing in cancer offers new therapeutic and diagnostic opportunities for targeting tumor invasiveness.
Area of Science:
- Oncology
- Cell Biology
- Biochemistry
Background:
- Dysregulated oxidative metabolism and reactive oxygen species (ROS) are hallmarks of cancer.
- NADPH oxidases (NOXes) are key enzymatic sources of ROS, with several isoforms implicated in cancer progression.
- Dual oxidases (DUOXes), typically expressed in epithelial cells, are paradoxically suppressed in epithelial cancers via epigenetic mechanisms.
Purpose of the Study:
- To review the role of ROS and NOX enzymes in cancer.
- To focus on the unique and opposing roles of DUOX enzymes in cancer biology.
- To explore the functional consequences of DUOX silencing, particularly DUOX1 loss, in lung cancer.
Main Methods:
- Literature review of current understanding of ROS and NOX in cancer.
- Analysis of recent findings on DUOX expression and function in epithelial cancers.
- Examination of mechanistic studies on DUOX1 loss in lung cancer models.
Main Results:
- While most NOX isoforms are upregulated in cancer, DUOXes are frequently downregulated in epithelial tumors.
- DUOX silencing is linked to epigenetic alterations and its functional relevance was previously unclear.
- DUOX1 loss in lung cancer is associated with increased tumor invasiveness.
Conclusions:
- DUOX enzymes play unique, potentially opposing roles in cancer compared to other NOX isoforms.
- Understanding the regulation and functional impact of DUOX silencing is crucial for cancer research.
- Investigating DUOX mechanisms may reveal novel diagnostic markers and therapeutic targets for epithelial cancers.
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