Reduction of molecular oxygen by redox active thiols: comparison of glutathione, N-acetylcysteine, cysteine, and homocysteine

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  • Nyui Minako
    Quantitative RedOx Sensing Group, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology
  • Shoji Yoshimi
    Quantitative RedOx Sensing Group, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology
  • Ueno Megumi
    Quantitative RedOx Sensing Group, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology
  • Nakanishi Ikuo
    Quantitative RedOx Sensing Group, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology Quantum-state Controlled MRI Group, Institute for Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology
  • Matsumoto Ken-ichiro
    Quantitative RedOx Sensing Group, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology Quantum-state Controlled MRI Group, Institute for Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology

書誌事項

タイトル別名
  • Reduction of molecular oxygen by redox active thiols: comparison of glutathione, <i>N</i>-acetylcysteine, cysteine, and homocysteine
公開日
2019
資源種別
journal article
DOI
  • 10.3164/jcbn.19-25
公開者
一般社団法人　日本酸化ストレス学会

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説明

<p>The reaction properties of the thiol compounds, cysteine (Cys), N-acetyl-l-cysteine (NAC), the reduced form glutathione (GSH), and homocysteine (HCS) were compared. The main purpose of this study was to find a thiol-based anti-oxidant suitable for biological experiments and to provide clear reasoning for its selection. The availability of thiol compounds to generate superoxide by reducing molecular oxygen (O2) at a hyperthermal temperature was discussed. An oxidative atmosphere, i.e., superoxide generation by the hypoxanthine-xanthine oxidase reaction, hydroxyl radical generation by X-ray irradiation, or direct one-electron oxidation by ferricyanide, was prepared in a reaction mixture containing 0.1 mM TEMPOL and 1 mM test compound, and the EPR signal decay of TEMPOL was observed. A reaction mixture containing 0.1 mM TEMPOL and 1 mM thiol compound was incubated at 44°C, and the EPR signal decay of TEMPOL was observed. Thiols could function as H-donors to the oxoammonium cation and produce the hydroxylamine form of TEMPOL in an oxidative atmosphere. Thiols could also irreversibly react with the oxoammonium cation. GSH and Cys could reduce O2 to form superoxide/hydroperoxyl radical at hyperthermal temperatures, but HCS and NAC could not reduce O2. GSH and Cys may cause reductive stress, whereas NAC is a simple tractable antioxidant.</p>

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