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Signaling by the respiratory burst in macrophages
1Department of Environmental Health Sciences, School of Public Health, University of Alabama at Birmingham, 35294, USA. hforman@uab.edu
IUBMB Life
|January 5, 2002
Summary
Reactive oxygen species (ROS) act as signaling molecules in cells, influencing processes like gene expression. Antioxidant enzymes and thiol chemistry are key to this redox signaling, potentially shifting the role of the macrophage respiratory burst.
Area of Science:
- Cellular Biology
- Biochemistry
- Immunology
Background:
- Macrophages and phagocytic cells generate reactive oxygen species (ROS) via NADPH oxidase during phagocytosis or stimulation.
- ROS production is increasingly recognized in various cell types and linked to physiological responses.
Purpose of the Study:
- To review the role of ROS as signaling molecules.
- To explore the mechanisms and implications of ROS in cellular signaling pathways.
Main Methods:
- Literature review of studies on NADPH oxidase, ROS production, and signal transduction.
- Analysis of the roles of specific ROS, antioxidant enzymes, and thiol chemistry in redox signaling.
Main Results:
- Hydrogen peroxide and superoxide, not hydroxyl radical, function as crucial second messengers in signaling.
- Antioxidant enzymes are involved in the deactivation phase of signal transduction.
- Thiol chemistry plays a critical role in the intricate processes of redox signaling.
Conclusions:
- The primary function of the respiratory burst in macrophages may be redox signaling, rather than solely microbicidal activity.
- ROS are integral to a wide array of physiological responses, including cell proliferation, gene expression, and apoptosis.