The perivascular niche regulates breast tumour dormancy.

The perivascular niche regulates breast tumour dormancy.
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DOI:
10.1038/ncb2767
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发表时间:
2013-07
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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在很大一部分乳腺癌患者中,远处转移在数年甚至数十年的潜伏期后出现。播散性肿瘤细胞(DTC)如何保持休眠状态,以及是什么“唤醒它们”,是肿瘤生物学中的基本问题。为了解决这些问题,我们在小鼠中利用转移测定来显示休眠的DTC驻留在肺、骨髓和脑的微血管系统上。然后,我们设计器官型微血管龛,以确定内皮细胞是否直接影响乳腺癌细胞(BCC)的生长。这些模型表明,内皮源性血小板反应蛋白-1诱导持续的BCC静止。这种抑制性信号在新生血管的萌芽中消失了;时间推移分析表明,新生血管不仅允许,而且加速了基底细胞癌的生长。我们在休眠模型和斑马鱼中证实了这一令人惊讶的结果,并将活性TGF-β1和骨膜蛋白鉴定为促肿瘤的内皮尖端细胞衍生因子。我们的工作表明,稳定的微血管构成了一个“休眠的生态位”,而萌芽的新血管火花微转移的产物。
In a significant fraction of breast cancer patients, distant metastases emerge after years or even decades of latency. How disseminated tumor cells (DTCs) are kept dormant, and what ‘wakes them up’, are fundamental problems in tumor biology. To address these questions, we utilized metastasis assays in mice to show that dormant DTCs reside upon microvasculature of lung, bone marrow and brain. We then engineered organotypic microvascular niches to determine whether endothelial cells directly influence breast cancer cell (BCC) growth. These models demonstrated that endothelial-derived thrombospondin-1 induces sustained BCC quiescence. This suppressive cue was lost in sprouting neovasculature; time-lapse analysis showed that sprouting vessels not only permit, but accelerate BCC outgrowth. We confirmed this surprising result in dormancy models and in zebrafish, and identified active TGF-β1 and periostin as tumor-promoting, endothelial tip cell-derived factors. Our work reveals that stable microvasculature constitutes a ‘dormant niche,’ whereas sprouting neovasculature sparks micrometastatic outgrowth.
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