Enhanced Induction of Apoptosis by Combined Treatment of Human Carcinoma Cells with X Rays and Death Receptor Agonists
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概要
- 論文の詳細を見る
The death receptors Fas and DR5 are known to be expressed not only in immune cells but also in various tumor cells. The aim of the present study was to determine whether X irradiation enhanced induction of apoptosis in Tp53 wild type and Tp53-mutated tumor cell lines treated with agonists against these death receptors. We showed that 5 Gy of X irradiation significantly up-regulated the expression of death receptors Fas and DR5 on the plasma membrane in gastric cancer cell lines MKN45 and MKN28, lung cancer cell line A549, and prostate cancer cell line DU145, and that subsequent treatments with agonistic molecules for these death receptors, Fas antibody CH11 and TRAIL, increased the formation of active fragment p20 of caspase 3 followed by the induction of apoptosis. This death-receptor-mediated apoptosis was independent of Tp53 status since MKN28 and DU145 were Tp53-mutated. The post-irradiation treatment of the cells with N-acetyl-L-cysteine (NAC) abolished the up-regulation of the expression of Fas and DR5 on the plasma membrane. NAC also attenuated the increase in the formation of p20 and the induction of apoptosis by agonistic molecules. These results suggested that the increase in the induction of apoptosis by combined treatment with X irradiation and CH11 or TRAIL occurred through a change of the intracellular redox state independent of Tp53 status in human carcinoma cell lines.
- 日本放射線影響学会の論文
- 2005-03-25
著者
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浅沼 武敏
北海道大学大学院獣医学研究科環境獣医科学講座放射線学教室
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KUWABARA MIKINORI
Laboratory of Radiation Biology, Graduate School of Veterinary Medicine
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INANAMI Osamu
Laboratory of Radiation Biology, Department of Environmental Veterinary Sciences, Graduate School of
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Kuwabara Mikinori
弘前大学 保健学研究科放射線生命科学
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Kuwabara Mikinori
Laboratory Of Radiation Biology Graduate School Of Veterinary Medicine
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Kuwabara Mikinori
Laboratory Of Radiation Biology Department Of Environmental Veterinary Sciences Graduate School Of V
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Asanuma Taketoshi
Laboratory Of Radiation Biology Department Of Environmental Veterinary Sciences Graduate School Of V
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Asanuma Taketoshi
Laboratory Of Radiation Biology Department Of Environmental Veterinary Medicine Graduate School Of V
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Asanuma Taketoshi
Depertment Of Radiation Biology Faculty Of Veterinary Medicine Hokkaido University
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Inanami Osamu
Laboratory Of Radiation Biology Department Of Environmental Veterinary Medical Sciences Graduate Sch
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Inanami Osamu
Laboratory Of Radiation Biology Graduate School Of Veterinary Medicine Hokkaido University
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HAMASU Taku
Laboratory of Radiation Biology, Department of Environmental Veterinary Sciences, Graduate School of
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KUWABARA Mikinori
Labs. Radiat. Biol.
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Hamasu Taku
Laboratory Of Radiation Biology Department Of Environmental Veterinary Sciences Graduate School Of V
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Kuwabara M
Hokkaido Univ. Sapporo Jpn
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Kuwabara Mikinori
Lab. Radiat. Biol. Grad. Sch. Vet. Med. Hokkaido Univ.
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