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A role for oxygen radicals as second messengers.
1Laboratorium für Molekulare Biologie der Ludwig-Maximilians-Universität, München, Genzentrum, Am Klopferspitz, D-8033 Martinsried, FRG.
Trends in Cell Biology
|August 1, 1991
Summary
Cells release oxygen radicals upon stimulation, which activate the transcription factor NF-kappa B. These radicals act as second messengers in pathways involving cytokines like tumor necrosis factor (TNF) and interleukin-1 (IL-1).
Area of Science:
- Cellular biology
- Biochemistry
- Immunology
Background:
- Cells produce oxygen radicals, which play roles in cellular signaling.
- Cytokines like tumor necrosis factor (TNF) and interleukin-1 (IL-1) are key immune modulators.
- Nuclear factor kappa B (NF-kappa B) is a crucial transcription factor involved in immune responses.
Purpose of the Study:
- To investigate the role of oxygen radicals as second messengers in cellular signaling.
- To explore the mechanism by which TNF and IL-1 activate NF-kappa B.
- To determine if oxygen radicals mediate the effects of certain stimuli on NF-kappa B activation.
Main Methods:
- Stimulation of various cell types with TNF, IL-1, and phorbol esters.
- Monitoring oxygen radical production and release.
- Assessing the activation of NF-kappa B.
- Using radical scavenging agents and oxidant stress to modulate responses.
Main Results:
- Small, non-toxic amounts of oxygen radicals are released by cells upon stimulation with TNF, IL-1, and phorbol esters.
- These stimuli activate cytoplasmic NF-kappa B by releasing an inhibitory protein subunit.
- Radical scavenging agents inhibit NF-kappa B activation.
- Mild oxidant stress mimics the activation of NF-kappa B.
Conclusions:
- Oxygen radicals function as second messengers for stimuli such as TNF and IL-1.
- This mechanism is involved in at least one regulatory pathway for NF-kappa B activation.
- Oxygen radicals are integral to the cellular response to specific immune and inflammatory signals.