Relevance of the capacity of phosphorylated fructose to scavenge the hydroxyl radical.

Published

Journal Article

The hydroxyl radical (*OH) has detrimental biological activity due to its very high reactivity. Our experiments were designed to determine the effects of equimolar concentrations of glucose, fructose and mannitol and three phosphorylated forms of fructose (fructose-1-phosphate (F1P); fructose-6-phosphate (F6P); and fructose-1,6-bis(phosphate) (F16BP)) on *OH radical production via the Fenton reaction. EPR spectroscopy using spin-trap DEPMPO was applied to detect radical production. We found that the percentage inhibition of *OH radical formation decreased in the order F16BP>F1P>F6P>fructose>mannitol=glucose. As ketoses can sequester redox-active iron thus preventing the Fenton reaction, the Haber-Weiss-like system was also employed to generate *OH, so that the effect of iron sequestration could be distinguished from direct *OH radical scavenging. In the latter system, the rank order of *OH scavenging activity was F16BP>F1P>F6P>fructose=mannitol=glucose. Our results clearly demonstrate that intracellular phosphorylated forms of fructose have more scavenging properties than fructose or glucose, leading us to conclude that the acute administration of fructose could overcome the body's reaction to exogenous antioxidants during appropriate therapy in certain pathophysiological conditions related to oxidative stress, such as sepsis, neurodegenerative diseases, atherosclerosis, malignancy, and some complications of pregnancy.

Full Text

Cited Authors

  • Spasojević, I; Mojović, M; Blagojević, D; Spasić, SD; Jones, DR; Nikolić-Kokić, A; Spasić, MB

Published Date

  • January 2009

Published In

Volume / Issue

  • 344 / 1

Start / End Page

  • 80 - 84

PubMed ID

  • 18947823

Pubmed Central ID

  • 18947823

Electronic International Standard Serial Number (EISSN)

  • 1873-426X

International Standard Serial Number (ISSN)

  • 0008-6215

Digital Object Identifier (DOI)

  • 10.1016/j.carres.2008.09.025

Language

  • eng