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Protection against peroxynitrite.
G E Arteel1, K Briviba, H Sies
1Institut für Physiologische Chemie I, Heinrich-Heine-Universität Düsseldorf, Germany.
FEBS Letters
|March 27, 1999
Summary
Biological defense against peroxynitrite, a reactive nitrogen species, involves preventing its formation, intercepting it with compounds like ebselen, or repairing damage. This protects tissues during inflammation.
Area of Science:
- Biochemistry
- Cellular Biology
- Toxicology
Background:
- Peroxynitrite is a reactive nitrogen species formed in vivo from superoxide and nitric oxide.
- It mediates oxidation, nitration, and nitrosation, causing cellular dysfunction, toxicity, and altered signaling.
- Protecting tissues from peroxynitrite is crucial, particularly during inflammatory responses.
Purpose of the Study:
- To review the biological mechanisms for protection against peroxynitrite.
- To categorize protective strategies into prevention, interception, and repair.
- To highlight key molecules and pathways involved in peroxynitrite defense.
Main Methods:
- Literature review of biological protection mechanisms against peroxynitrite.
- Analysis of chemical reactions and protective roles of specific compounds.
- Categorization of protective strategies based on their mode of action.
Main Results:
- Biological protection against peroxynitrite is achieved through three main strategies: prevention, interception, and repair.
- Prevention involves controlling the precursors, nitric oxide and superoxide.
- Interception utilizes compounds like organoselenium, metalloporphyrins, and peroxidases (e.g., glutathione peroxidase, myeloperoxidase) that react rapidly with peroxynitrite.
- Ebselen and glutathione peroxidase act catalytically, while metalloporphyrins are supported by glutathione or ascorbate.
- Repair mechanisms remove damaged products and restore biomolecules.
Conclusions:
- Effective defense against peroxynitrite damage is essential for tissue protection, especially during inflammation.
- Interception strategies employing specific compounds offer direct protection by neutralizing peroxynitrite.
- A multi-faceted approach combining prevention, interception, and repair ensures cellular and tissue integrity against peroxynitrite-mediated damage.