Reactivity of Redox Sensitive Paramagnetic Nitroxyl Contrast Agents with Reactive Oxygen Species

Overview

Journal J Clin Biochem Nutr

Specialty Biochemistry

Date 2019 Feb 2

PMID 30705507

Citations 2

Authors

Minako Nyui

Ikuo Nakanishi

Kazunori Anzai

Toshihiko Ozawa

Ken-Ichiro Matsumoto

Affiliations

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Abstract

The reactivity of nitroxyl free radicals, 4-hydroxyl-2,2,6,6-tetramethylpiperidine--oxyl (TEMPOL) and 3-carbamoyl-2,2,5,5-tetramethylpyrrolidine--oxyl (CmP), with reactive oxygen species (ROS) were compared as typical 6-membered and 5-membered ring nitroxyl compounds, respectively. The reactivity of the hydroxylamine forms of both these nitroxyl radicals (TEMPOL-H and CmP-H) was also assessed. Two free radical species of ROS, hydroxyl radical (OH) and superoxide (O ), were subjected to a competing reaction. OH was generated by UV irradiation from an aqueous HO solution (HO-UV system), and O was generated by a reaction between hypoxanthine and xanthine oxidase (HX-XO system). OH and O generated by the HO-UV and HX-XO systems, respectively, were measured by electron paramagnetic resonance (EPR) spin-trapping, and the amount of spin adducts generated by each system was adjusted to be equal. The time courses of the one-electron oxidation of TEMPOL, CmP, TEMPOL-H, and CmP-H in each ROS generation system were compared. A greater amount of TEMPOL was oxidized in the HX-XO system compared with the HO-UV system, whereas the reverse was observed for CmP. Although the hydroxylamine forms of the tested nitroxyl radicals were oxidized evenly in the HO-UV and HX-XO systems, the amount of oxidized CmP-H was approximately 3 times greater compared with TEMPOL-H.

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