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Anti-nitrotyrosine antibodies for immunohistochemistry
1Department of Anesthesiology and The UAB Center for Free Radical Biology, The University of Alabama at Birmingham, Birmingham, AL.
Methods in Molecular Medicine
|February 23, 2011
Summary
Nitrotyrosine is a key marker indicating the presence of peroxynitrite, a reactive nitrogen species. Its formation in vivo is primarily driven by the reaction between nitric oxide and superoxide, not nitric oxide alone.
Area of Science:
- Biochemistry
- Molecular Biology
- Physiology
Background:
- Nitrotyrosine is a significant biomarker for reactive nitrogen species (RNS) formation in vivo.
- Elevated nitric oxide (NO) production in pathological conditions does not directly cause tyrosine nitration.
- NO reacts rapidly with superoxide (O(2)(-)) to generate peroxynitrite (ONOO(-)), a potent oxidizing agent.
Purpose of the Study:
- To elucidate the primary mechanism of nitrotyrosine formation in biological systems.
- To investigate the role of peroxynitrite in the nitration of tyrosine residues in proteins.
Main Methods:
- The study focuses on the chemical reactions and biological conditions relevant to RNS formation.
- Analysis of tyrosine nitration products under varying biological conditions.
Main Results:
- Peroxynitrite (ONOO(-)) is the principal agent responsible for nitrating tyrosine residues on proteins.
- Nitration occurs predominantly at the 3-position of tyrosine following peroxynitrite attack.
- While other minor pathways exist, peroxynitrite represents the most efficient mechanism for tyrosine nitration in vivo.
Conclusions:
- Peroxynitrite is the major in vivo source of nitrotyrosine.
- Understanding this pathway is crucial for interpreting nitrotyrosine as a marker in various physiological and pathological states.
