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High biological effectiveness depends on the direct action by heavy ions
https://repo.qst.go.jp/records/70946
https://repo.qst.go.jp/records/70946f4f57100-9ba1-4a60-998c-e0cd263bc14f
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2012-10-26 | |||||
| タイトル | ||||||
| タイトル | High biological effectiveness depends on the direct action by heavy ions | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Hirayama, Ryoichi
× Hirayama, Ryoichi× Matsumoto, Yoshitaka× Koda, Kana× Uzawa, Akiko× Noguchi, Miho× Kase, Yuki× Ito, Atsushi× Matsufuji, Naruhiro× Okayasu, Ryuichi× Furusawa, Yoshiya× 平山 亮一× 松本 孔貴× 幸田 華奈× 鵜澤 玲子× 伊藤 敦× 松藤 成弘× 岡安 隆一× 古澤 佳也 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The contribution of indirect action mediated by OH radicals in cell killing can be estimated from the experiment using an OH radical scavenger DMSO, which suppresses indirect action without affecting direct action. Exponentially growing Chinese hamster ovary cells under oxic and hypoxic conditions were exposed to X-rays and high-LET heavy ion radiations of 15 to 480 keV/micrometer in the presence or absence of DMSO, and their survival fractions were determined using a colony formation assay. The contribution of indirect action to cell killing decreased with increasing LET under both oxic and hypoxic conditions. The contributions under hypoxic condition were lower than that under oxic condition at each LET data point. The RBE and OER were determined at a survival level of 10%. The RBE values under both oxic and hypoxic conditions increased with LET, reached a peak at around 200 keV/micrometer, and then decreased with LET. The OER value started to decrease at around 50 keV/micrometer, and became below 2 at around 90 keV/micrometer, and then reached approximately 1 or slightly higher in the very high LET region. When the RBE and the OER were estimated separately for direct action (RBED and OERD) and indirect action (RBEI and OERI), the RBED under both conditions were larger than RBEI at 90-480 keV/micrometer. OERD was smaller than OERI at every LET data point. Thus, the direct action by heavy-ion beams gives a remarkably large RBE and small OER for cell killing in comparison to OH radical-mediated indirect action. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 39th Annual Meeting of the European Radiation Research Society | |||||
| 発表年月日 | ||||||
| 日付 | 2012-10-19 | |||||
| 日付タイプ | Issued | |||||
