Oxygen concentration dependence of lipid peroxidation and lipid-derived radical generation: Application of profluorescent nitroxide switch

Fumiya Mito, Kana Kitagawa, Toshihide Yamasaki, Chisato Shirahama, Taketoshi Oishi, Yuko Ito, Mayumi Yamato, Ken Ichi Yamada

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Lipid-derived radicals and peroxides are involved in the pathogenesis of oxidative stress diseases and, although lipid peroxide production is a required reaction between a lipid radical and molecular oxygen, a useful lipid radical detection method has remained tentative. Also, the effect of oxygen concentration on lipid peroxide production must be considered because of the hypoxic conditions in cancer and ischemic regions. In this study, the focus was on nitroxide reactivity, which allows spin trapping with carbon-centred radicals via radicalradical reactions and fluorophore quenching through interactions with nitroxide's unpaired electron. Thus, the aim here was to demonstrate a useful detection method for lipid-derived radicals as well as to clarify the effects of oxygen concentration on lipid peroxide production using profluorescent nitroxide. This latter compound reacted with lipid-derived radicals in a manner inversely dependent on oxygen concentration, resulting in fluorescence due to alkoxyamine formation and, conversely, lipid peroxide concentrations decreased with lower oxygen in the reaction system. Furthermore, nitroxide inhibited lipid peroxide production and stopped oxygen consumption in the same solution. These results suggested that the novel application of profluorescent nitroxide could directly and sensitively detect lipid-derived radicals and that radical and peroxide production were dependent on oxygen concentration.

Original languageEnglish
Pages (from-to)1103-1110
Number of pages8
JournalFree Radical Research
Volume45
Issue number9
DOIs
Publication statusPublished - Sep 2011

All Science Journal Classification (ASJC) codes

  • Biochemistry

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