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Antioxidant properties of aminoguanidine
Author(s) -
CourderotMasuyer Carol,
Dalloz Florence,
Maupoil Véronique,
Rochette Luc
Publication year - 1999
Publication title -
fundamental and clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 73
eISSN - 1472-8206
pISSN - 0767-3981
DOI - 10.1111/j.1472-8206.1999.tb00358.x
Subject(s) - chemistry , trolox , hydroxyl radical , antioxidant , free radical theory of aging , radical , oxygen radical absorbance capacity , free radical scavenger , glycation , scavenger , hydrochloride , biochemistry , photochemistry , antioxidant capacity , receptor
— It is well known that aminoguanidine (AG) can diminish advanced glycosylation of proteins, which might be beneficial in preventing chronic diabetic complications. Recent reports suggested an inter‐relationship between glycosylation of protein and free radical damage. In the present study, we examined the free radical scavenging properties of AG. Electron paramagnetic resonance using the spin‐trap 5,5‐dimethyl‐1‐pyrroline N‐oxide (DMPO) was performed to determine the superoxide and hydroxyl radical scavenging abilities of AG. These experiments revealed that AG was an effective hydroxyl radical scavenger even though it expressed a direct inhibitory effect on the xanthine oxidase activity at high concentrations (AG ≥ 5 mM). In the second part of the study, allophycocyanin was used as an indicator of free radical mediated protein damage. In the assay, 2,2′‐azobis(2‐amidinopropane) hydrochloride (AAPH) was used as a peroxyl radical generator, and the loss of allophycocyanin fluorescence was monitored. The antioxidant effect of AG was expressed in oxygen‐radical absorbing capacity (ORAC), where one ORAC unit equals the net protection produced by 1 μM Trolox (a water soluble analogue of vitamin E) as a control standard. AG exhibited a significant dose‐dependent effect against free radical damage. These radical scavenging properties of AG may contribute to protective effects during glycation and explain the prevention of diabetic complications.