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Reduction of nitroxides and radioprotective ability in glioblastoma cells

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Abstract

Electron spin resonance (ESR) analyses were performed to clarify whether glioblastoma cells scavenge hydroxyl radicals (·OH) generated by x-ray irradiation. The rate of bioreduction of nitroxides by three human glioblastoma cells was also evaluated by the same technique and compared with their x-ray sensitivity. Aerated culture media containing 200 mM of 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) with or without U87MG cells were irradiated with x-rays at a dose of 20 Gy. ESR was measured immediately after each irradiation. Continuous changes of the ESR spectra of 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (Tempol) were analyzed in cell suspensions of TK1, U87MG, and A172 at a concentration of 1.0×107 cells/ml containing 5 μM Tempol. As a result, the signal of DMPO-OH in the U87MG cell suspension decayed faster than that in the control culture media without cells, and the rate of bioreduction of Tempol in each glioblastoma cell suspension was correlated with the x-ray sensitivity defined from the colony-forming assay in those cell lines. It was indicated that the resistance of glioblastoma cells to ionizing radiation could be closely related to their ability to scavenge radical species generated by ionizing radiation.

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Authors and Affiliations

  1. Department of Neurosurgery, Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Tennodai, 305-8575, Tsukuba, Ibaraki, Japan

    Takashi Moritake, Koji Tsuboi & Tadao Nose

  2. Redox Regulation Research Group, National Institute of Radiological Sciences, Chiba, Japan

    Kazunori Anzai & Toshihiko Ozawa

Authors
  1. Takashi Moritake
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  2. Koji Tsuboi
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  3. Kazunori Anzai
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  4. Toshihiko Ozawa
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  5. Tadao Nose
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Correspondence to Koji Tsuboi.

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Moritake, T., Tsuboi, K., Anzai, K. et al. Reduction of nitroxides and radioprotective ability in glioblastoma cells. Brain Tumor Pathol 20, 1–5 (2003). https://doi.org/10.1007/BF02478940

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  • DOI: https://doi.org/10.1007/BF02478940

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