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NOX Activation by Subunit Interaction and Underlying Mechanisms in Disease
Radhika Rastogi1, Xiaokun Geng2, Fengwu Li3
1Department of Neurosurgery, Wayne State University School of Medicine Detroit, MI, USA.
Frontiers in Cellular Neuroscience
|January 26, 2017
Summary
Nicotinamide adenine dinucleotide phosphate (NADPH) oxidase (NOX) enzyme activation involves crucial subunit interactions, particularly p47-phox with p22-phox. Targeting these interactions offers a promising strategy for developing novel NOX inhibitors.
Area of Science:
- Biochemistry and Molecular Biology
- Cellular Signaling and Oxidative Stress
- Neuroscience and Disease Pathogenesis
Background:
- Nicotinamide adenine dinucleotide phosphate (NADPH) oxidase (NOX) enzymes generate superoxide and reactive oxygen species (ROS), impacting cellular signaling and immune responses.
- Dysregulated NOX activity contributes to oxidative stress and pathogenesis in various diseases, notably stroke, traumatic brain injury (TBI), and neurodegenerative disorders.
- NOX inhibitors are explored as therapeutics, but a deeper understanding of NOX complex assembly and activation is needed for targeted drug development.
Purpose of the Study:
- To review the subunit interactions within the NOX complex, focusing on the activation mechanism.
- To highlight the critical role of p47-phox in NOX assembly and translocation of cytosolic subunits.
- To discuss the potential of targeting NOX subunit interactions, specifically p47-phox and p22-phox, for novel therapeutic strategies.
Main Methods:
- Review of existing literature on NOX enzyme structure, function, and regulation.
- Analysis of subunit interactions, including phosphorylation-dependent mechanisms involving protein kinase C (PKC).
- Focus on the p47-phox and p22-phox interaction as a key step in NOX activation.
Main Results:
- The NOX complex comprises distinct cytosolic (p47-phox, p67-phox, p40-phox, Rac) and membrane (gp91-phox, p22-phox) subunits.
- p47-phox is essential for NOX activation, mediating the translocation and anchoring of cytosolic subunits to the membrane via interaction with p22-phox.
- Phosphorylation events, particularly involving PKC, regulate the interaction between p47-phox and p22-phox, influencing NOX assembly and function.
Conclusions:
- Understanding the intricate subunit interactions of the NOX complex, especially the p47-phox/p22-phox interface, is crucial for deciphering its role in disease.
- Targeting the assembly and activation process of NOX, by inhibiting specific subunit interactions, represents a promising avenue for developing more specific NOX inhibitors.
- Further investigation into these interactions could lead to the development of novel therapeutic agents, such as apocynin analogs, for diseases associated with oxidative stress.
Keywords:
NAPDH oxidaseNOX inhibitorsPKCTBIischemia/reperfusionneurodegenerative diseasereactive oxygen speciesstrokeMore Related Videos
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