کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1886162 1533527 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Radiosensitization by fullerene-C60 dissolved in squalene on human malignant melanoma through lipid peroxidation and enhanced mitochondrial membrane potential
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
پیش نمایش صفحه اول مقاله
Radiosensitization by fullerene-C60 dissolved in squalene on human malignant melanoma through lipid peroxidation and enhanced mitochondrial membrane potential
چکیده انگلیسی


• We examined fullerene-C60 dissolved in squalene (C60/Sqe) as a potential radiosensitizer.
• C60/Sqe exhibited radiosensitization under X-ray irradiation on melanoma cells.
• C60/Sqe obviously augmented mitochondrial potential on melanoma cells than Sqe.
• C60/Sqe exhibited lipid peroxidation more markedly by 1.2-fold than Sqe alone.
• Radiosensitization of C60/Sqe can be attributed to oxidative stress mediated by C60.

We examined fullerene-C60 dissolved in squalene (C60/Sqe) for the ability to potentiate the radiosensitization under X-ray irradiation on human malignant melanoma HMV-II cells, which were treated with C60/Sqe and thereafter irradiated with X-ray. The cell proliferation for C60/Sqe was inhibited more markedly than for Sqe alone. Meanwhile, cell proliferation was almost unaltered for C60/squalane (Sqa) or Sqa, a hydrogenated form of Sqe, as compared to no-additive control. Thus radiosensitization of C60/Sqe is attributed to peroxidation of unsaturated bonds of squalene by X-ray-excited C60 in contrast to squalane. The fluorescence images of HMV-II cells stained with Rhodamine123, an indicator for mitochondrial membrane potential, were monitored for 6 h after X-ray irradiation. C60/Sqe obviously exhibited more augmented fluorescence intensity on perinuclear region of HMV-II cells than Sqe alone. TBARS assay showed that the lipid peroxidation level as malondialdehyde-equivalent increased by combination of C60/Sqe and X-ray dose-dependently on X-ray doses. C60/Sqe exhibited lipid peroxidation more markedly by 1.2-fold than Sqe alone. Thus the level of lipid peroxidation of squalene was sufficiently higher in C60/Sqe than in Sqe in the absence of C60 under X-ray irradiation, suggesting the combination of C60/Sqe and X-ray irradiation induced radiosensitization on HMV-II cells by peroxidation of absorbed Sqe in mitochondrial membrane via oxidative stress mediated by fullerene-C60.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Radiation Physics and Chemistry - Volume 97, April 2014, Pages 134–141
نویسندگان
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