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Hydrogen peroxide as a cell-survival signaling molecule
Gillian Groeger1, Claire Quiney, Thomas G Cotter
1Cell Development and Disease Laboratory, Biochemistry Department, Biosciences Institute, University College Cork , Cork, Ireland.
Antioxidants & Redox Signaling
|June 30, 2009
Summary
Hydrogen peroxide (H2O2), a reactive oxygen species (ROS), acts as a survival molecule by regulating intracellular signaling. Understanding H2O2 production and its effects on pathways like kinase signaling and transcription factors aids therapeutic development.
Area of Science:
- Cellular biology
- Biochemistry
- Molecular signaling
Background:
- Reactive oxygen species (ROS) were traditionally viewed as damaging molecules.
- Emerging evidence highlights ROS, particularly hydrogen peroxide (H2O2), as crucial intracellular second messengers.
- H2O2 plays a significant role in regulating cellular survival pathways.
Purpose of the Study:
- To review the role of H2O2 as a survival molecule.
- To investigate the production of H2O2 by the NADPH oxidase (Nox) family.
- To delineate the intracellular pathways modulated by H2O2 for prosurvival functions.
Main Methods:
- Review of literature on H2O2 production by Nox enzymes and their regulation.
- Analysis of signaling pathways regulated by H2O2, focusing on kinase-driven pathways.
- Examination of H2O2's effects on phosphatases, transcription factors (p53, NF-kappaB, AP-1), and prodeath proteins (caspases).
Main Results:
- NADPH oxidase (Nox) proteins are key producers of H2O2 in response to stress, mediating prosurvival.
- H2O2 regulates survival pathways through cysteine oxidation of phosphatases.
- H2O2 influences transcription factors and can directly inhibit prodeath proteins like caspases.
Conclusions:
- H2O2 is a critical prosurvival molecule, not solely a damaging agent.
- Understanding H2O2 generation and its molecular targets is vital for therapeutic strategies.
- Targeting H2O2-mediated pathways offers potential for precise therapeutic interventions.
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