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

Authorized Users Only
2009
Authors
Spasojević, Ivan
Mojović, Miloš
Blagojević, Duško
Spasić, Snežana
Jones, David
Nikolić-Kokić, Aleksandra
Spasić, Mihajlo
Article (Published version)
,
Elsevier
Metadata
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Abstract
The hydroxyl radical (radical dotOH) 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 radical dotOH 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 radical dotOH 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 radical dotOH, so that the effect of iron sequestration could be distinguished from direct radical dotOH radical scavenging. In the latter system, the rank order of radical dotOH scavenging activity was F16...BP > 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.

Keywords:
Fructose / Glucose / Hydroxyl radical / Mannitol / EPR spectroscopy / Haber–Weiss reaction
Source:
Carbohydrate Research, 2009, 344, 1, 80-84
Publisher:
  • Elsevier
Projects:
  • The Role of Redox-Active Substances in the Maintenance of Homeostasis (RS-143034)
  • Biofizička istraživanja membranskih procesa: interakcija membranskih receptora i kanala sa spoljašnjim faktorima i intracelularna regulacija (RS-143016)

DOI: 10.1016/j.carres.2008.09.025

ISSN: 0008-6215; 1873-426X

WoS: 000262596200011

Scopus: 2-s2.0-57749111966
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URI
https://cer.ihtm.bg.ac.rs/handle/123456789/3937
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