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Reactive oxygen species as double-edged swords in cellular processes: low-dose cell signaling versus high-dose
1Laboratory of Environmental Carcinogenesis and Mutagenesis, National Institute of Environmental Health Sciences (NIEHS), Research Triangle Park, North Carolina 27709, USA. martin9@niehs.nih.gov
Abstract:
ROS are diverse and abundant in biological systems. While excessive ROS production clearly damages DNA, low levels of ROS affect cell signaling particularly at the level of redox modulation. Moreover, the specific contributions of ROS to apoptosis and mitogenesis in maintenance of cell number homeostasis remains to be elucidated. ROS dose is a critical parameter in determining the ultimate cellular response; however the shape of the dose response curve is unpredictable. When cells are stimulated with ROS, cell-signaling cascades are activated. It appears that the cellular redox potential is an important determinant of cell function and interruption of redox balance may adversely affect cell function. As a result, compounds such as antioxidants may intercept critical ROS signaling molecules and both protect cells and foster pathogenesis. As a result, further study is needed to unravel the role of ROS in redox regulation and the potential outcome of antioxidant administration on cellular responses.
Insights
Reactive oxygen species (ROS) play a dual role in cells, impacting cell signaling at low levels and DNA damage at high levels. Understanding ROS effects is crucial for predicting antioxidant impacts.
Area of Science:
- Cellular biology
- Biochemistry
- Molecular biology
Background:
- Reactive oxygen species (ROS) are integral to biological systems.
- While excessive ROS cause DNA damage, low levels modulate cell signaling.
- The precise roles of ROS in apoptosis and mitogenesis are not fully understood.
Purpose of the Study:
- To investigate the dose-dependent effects of ROS on cellular responses.
- To elucidate the contribution of ROS to cell number homeostasis.
- To understand the implications of ROS signaling in cellular functions.
Main Methods:
- Cellular stimulation with varying doses of ROS.
- Analysis of cell signaling cascades.
- Assessment of redox potential and balance.
Main Results:
- ROS dose critically influences cellular outcomes, but dose-response curves are unpredictable.
- Cell signaling cascades are activated upon ROS stimulation.
- Redox potential is a key determinant of cell function.
Conclusions:
- ROS exhibit complex roles in cellular processes, influencing signaling and homeostasis.
- Antioxidants may have dual effects, offering protection or promoting pathogenesis.
- Further research is essential to clarify ROS functions and antioxidant impacts.