DNA damage-mediated induction of a chemoresistant niche.

DNA damage-mediated induction of a chemoresistant niche.
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DOI:
10.1016/j.cell.2010.09.043
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发表时间:
2010-10-29
期刊:
影响因子:
64.5
通讯作者:
Hemann MT
Hemann MT
中科院分区:
生物学1区
文献类型:
--
作者:
Gilbert LA;Hemann MT

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虽然已知许多细胞内在过程在化疗反应中起决定性作用,但对肿瘤微环境对治疗结果的影响知之甚少。在这里,我们使用一个完善的伯基特淋巴瘤小鼠模型显示,旁分泌因子在肿瘤微环境调节淋巴瘤细胞的生存遗传毒性化疗后管理。具体而言,IL-6和Timp-1响应于DNA损伤而在胸腺中释放,从而产生“化学抗性小生境”,其促进最小残余肿瘤负荷的存活并充当最终肿瘤复发的储库。值得注意的是,IL-6在基因毒性应激后以p38依赖性方式从胸腺内皮细胞中急性释放,并且这种急性分泌反应在肿瘤相关基质细胞中逐渐诱导衰老之前。因此,传统化疗可以诱导肿瘤消退,同时引发应激反应,保护选定解剖位置的肿瘤细胞亚群免受药物作用。
While numerous cell-intrinsic processes are known to play decisive roles in chemotherapeutic response, relatively little is known about the impact of the tumor microenvironment on therapeutic outcome. Here, we use a well-established mouse model of Burkitt's lymphoma to show that paracrine factors in the tumor microenvironment modulate lymphoma cell survival following the administration of genotoxic chemotherapy. Specifically, IL-6 and Timp-1 are released in the thymus in response to DNA damage, creating a “chemo-resistant niche” that promotes the survival of a minimal residual tumor burden and serves as a reservoir for eventual tumor relapse. Notably, IL-6 is released acutely from thymic endothelial cells in a p38-dependent manner following genotoxic stress, and this acute secretory response precedes the gradual induction of senescence in tumor-associated stromal cells. Thus, conventional chemotherapies can induce tumor regression while simultaneously eliciting stress responses that protect subsets of tumor cells in select anatomical locations from drug action.
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