氨酸蛋白酶B介导辐射诱导的旁观者效应
Yu Peng1, Man Zhang1, Lingjun Zheng2,3
1School of Life Sciences &Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Tsinghua University, Beijing 100084, China.
Nature
|July 21, 2017
概括
研究人员发现一种分泌的蛋白质CPR-4是C. elegans中第一个辐射诱导的旁观者效应 (RIBE) 因素. 这一发现有助于人们对辐射的理解.
科学领域:
- 分子生物学
- 辐射生物学
- 遗传学
背景情况:
- 辐射诱导的旁观者效应 (RIBE) 涉及细胞间信号传递,辐射细胞影响未辐射细胞,导致基因组不稳定性和细胞命运的改变.
- 尽管对辐射安全和治疗有影响,但影响RIBE的分子因素及其机制仍然很大程度上未知.
- 了解RIBEs对于开发放射性保护策略和优化放射治疗效果至关重要.
研究的目的:
- 在模型生物体中识别辐射诱导旁观者效应 (RIBE) 的分子因素.
- 阐明RIBE因子对非辐射细胞和组织的影响的机制.
- 研究特定基因和信号通路在调节RIBE因子活动中的作用.
主要方法:
- 用Caenorhabditis elegans作为一个模型系统来研究辐射诱导的旁观者效应.
- 使用生物化学测定和条件介质实验来确定分泌的RIBE因子.
- 使用遗传方法研究了特定基因 (例如CPR-4,CEP-1,DAF-2) 的参与及其调节作用.
主要成果:
- 确定了囊蛋白酶CPR-4,一种甲素B同类物,作为第一个线虫RIBE因子.
- 已经证明受辐射动物分泌的CPR-4可以抑制细胞死亡,并增加未受辐射受体的胚胎死亡率.
- 显示CPR-4在未经辐射的组织中调节远端应激反应,其活性由CEP-1和DAF-2信号调节.
结论:
- CPR-4是C. elegans中辐射诱导的旁观者效应的关键分泌因子.
- 这项研究揭示了一种涉及CPR-4,CEP-1和DAF-2的细胞间辐射信号传递的新机制.
- 这项工作为RIBE机制提供了关键的见解,为确定额外的因素和治疗目标铺平了道路.
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