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Updated: Apr 21, 2026

Nitropeptide Profiling and Identification Illustrated by Angiotensin II

Nitropeptide Profiling and Identification Illustrated by Angiotensin II

Published on: June 16, 2019

Nitroxides prevent protein glycoxidation in vitro.

I Sadowska-Bartosz¹, S Galiniak, J Skolimowski

¹Department of Biochemistry and Cell Biology, University of Rzeszów , Rzeszów , Poland.

Free Radical Research

|November 4, 2014

Summary

This summary is machine-generated.

Nitroxides, including TEMPO, show promise in preventing protein damage from sugar reactions (glycoxidation). Some compounds protected against glucose and fructose-induced damage, suggesting potential therapeutic applications.

Keywords:

albumin fructose glucose glycoxidation nitroxides ribose

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Area of Science:

Biochemistry
Free Radical Chemistry
Protein Chemistry

Background:

Glycoxidation, a process involving sugar-protein reactions, contributes to oxidative stress and various pathologies.
Advanced glycation end products (AGEs) are markers of glycoxidation and are implicated in diseases like diabetes and aging.
Nitroxides are stable free radicals with antioxidant properties.

Purpose of the Study:

To investigate the potential of various nitroxides in preventing glycoxidation of bovine serum albumin (BSA).
To evaluate the protective effects of different nitroxides against glycoxidation induced by glucose, fructose, and ribose.
To understand the role of free radical reactions in the glycoxidation process.

Main Methods:

Incubation of bovine serum albumin with monosaccharides (glucose, fructose, ribose) in the presence of seven different nitroxides.
Assessment of protein modifications using fluorimetric parameters (AGEs, dityrosine, N'-formylkynurenine, kynurenine).
Quantification of AGEs using enzyme-linked immunosorbent assay (ELISA).
Electron spin resonance (ESR) spectroscopy to monitor nitroxide stability during glycoxidation.

Main Results:

(2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO), 4-carboxy-TEMPO, and 4-hydroxy-TEMPO demonstrated significant protection against glucose- and fructose-induced BSA glycoxidation.
3-carbamoyl-PROXYL showed no protection and enhanced glycoxidation, while 4-amino-TEMPO offered limited protection against ribose-induced glycoxidation.
Loss of nitroxide ESR signal during glycoxidation indicated the involvement of free radical reactions.

Conclusions:

Nitroxides, particularly TEMPO derivatives, can effectively inhibit protein glycoxidation induced by common monosaccharides.
The findings suggest that nitroxides hold potential as therapeutic agents for mitigating glycoxidation-related damage.
Free radical scavenging by nitroxides is a key mechanism in preventing glycoxidation.