DNA Repair:重离子辐射诱导增殖性细胞死亡研究新进展

2018-03-15 佚名 合肥物质科学研究院

增殖性细胞死亡(细胞克隆死亡)是辐射放疗诱导肿瘤干细胞死亡的一种重要方式。当前重离子辐射已成为一种先进有效的癌症治疗方法,与传统的γ和X射线不同,重离子入射径迹上的能量沉积和径迹结构是不均一的,这导致重离子辐射有独特的生物学效应-射程分布。已有研究中,重离子诱导增殖性细胞死亡-射程分布实验均在细胞实验体系上进行,未发现活体水平实验证据。

增殖性细胞死亡(细胞克隆死亡)是辐射放疗诱导肿瘤干细胞死亡的一种重要方式。当前重离子辐射已成为一种先进有效的癌症治疗方法,与传统的γ和X射线不同,重离子入射径迹上的能量沉积和径迹结构是不均一的,这导致重离子辐射有独特的生物学效应-射程分布。已有研究中,重离子诱导增殖性细胞死亡-射程分布实验均在细胞实验体系上进行,未发现活体水平实验证据。

近期,中国科学院合肥物质科学研究院技术生物与农业工程研究所卞坡课题组、中科院近代物理研究所研究员周利斌合作,利用模式动物线虫个体小和阴门细胞具有辐射诱导增殖性死亡的特性,设计出连续降能实验装置,成功在活体水平演示了碳离子辐射诱导增殖性细胞死亡的射程分布。研究结果表明,碳离子辐射诱导线虫增殖性细胞死亡的射程分布与物理布拉格分布并不一致,且生物峰位置随辐射剂量增加前移,这个前移主要来自线虫阴门前体细胞所特有的“命运替换”属性。进一步研究DNA损伤反应在重离子诱导细胞增殖性死亡中的角色发现,DNA损伤检验点未参与细胞增殖性死亡诱导,下游同源重组修复机制起关键性作用。这些独特的辐射反应特性,为进一步深入理解重离子与细胞作用提供了新研究思路。

相关研究成果发表在辐射领域期刊DNA Repair上。该研究得到了国家自然科学基金委、中科院青年创新促进会的资助。

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    2018-03-20 大爰

    学习了谢谢分享!!

    0

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    2018-03-17 jiyangfei
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    2018-03-17 gwc384
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    2018-03-15 衣带渐宽

    学习

    0

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    2018-03-15 衣带渐宽

    学习

    0

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