Platelets promote tumour metastasis via interaction between TLR4 and tumour cell-released high-mobility group box1 protein

Platelets promote tumour metastasis via interaction between TLR4 and tumour cell-released high-mobility group box1 protein
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血小板通过TLR4与肿瘤细胞释放的高迁移率group box1蛋白之间的相互作用促进肿瘤转移

DOI:
10.1038/ncomms6256
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发表时间:
2014-10
影响因子:
16.6
通讯作者:
Wang Hong-Yang
Wang Hong-Yang
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Yu Le-Xing;Yan Lei;Yang Wen;Wu Fu-Quan;Ling Yan;Chen Shu-Zhen;Tang Liang;Tan Ye-Xiong;Cao Dan;Wu Meng-Chao;Yan He-Xin;Wang Hong-Yang

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越来越多的证据表明,肿瘤细胞表达TLR 4促进肿瘤进展,但目前尚不清楚TLR 4是否参与转移。在此,我们发现TLR 4缺乏可显著减少实验性肺转移而不影响原发肿瘤的生长。小鼠骨髓移植实验和抗血小板药物的应用表明,血小板表面TLR 4在肿瘤转移中起重要作用。TLR 4是体外血小板-肿瘤细胞相互作用的关键。此外,高迁移率族蛋白1(HMGB 1)中和作用以TLR 4依赖的方式减弱体外血小板-肿瘤细胞相互作用和体内转移,表明肿瘤细胞释放的HMGB 1是与血小板上的TLR 4相互作用并介导血小板-肿瘤细胞相互作用的关键因子,从而促进转移。这些发现证明了血小板促进肿瘤细胞转移的机制,并建议TLR 4及其内源性配体HMGB 1作为抗转移治疗的靶点。
Increasing evidence suggests that TLR4 expression by tumour cells promotes tumour progression, but it is unclear whether TLR4 is involved in metastasis. Here we show thatTLR4deficiency significantly diminishes experimental lung metastasis without affecting primary tumour growth. Bone marrow transplantation experiment and application of antiplatelet agents in mice demonstrate that TLR4 on platelets plays an important role in metastasis. TLR4 is critical for platelet–tumour cell interactionin vitro. Furthermore, high-mobility group box1 (HMGB1) neutralization attenuates platelet–tumour cell interactionin vitroand metastasisin vivoin a TLR4-dependent manner, indicating that tumour cell-released HMGB1 is the key factor that interacts with TLR4 on platelets and mediates platelet–tumour cell interaction, which promotes metastasis. These findings demonstrate a mechanism by which platelets promote tumour cell metastasis and suggest TLR4, and its endogenous ligand HMGB1 as targets for antimetastatic therapies.
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