miR-126 and miR-126* repress recruitment of mesenchymal stem cells and inflammatory monocytes to inhibit breast cancer metastasis.

miR-126 and miR-126* repress recruitment of mesenchymal stem cells and inflammatory monocytes to inhibit breast cancer metastasis.
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DOI:
10.1038/ncb2690
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发表时间:
2013-03
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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肿瘤间质是癌症进展过程中的积极参与者。基质细胞通过多种机制促进肿瘤进展和转移,包括增强肿瘤侵袭力和血管生成,以及抑制免疫监视。我们在此报告,miR-126/miR-126*,一种来源于单一前体的microRNA对,在小鼠异种移植模型中独立抑制间充质干细胞和炎性单核细胞向肿瘤间质中的顺序募集,以抑制乳腺肿瘤细胞的肺转移。miR-126/miR-126* 直接抑制基质细胞衍生因子-1 α(Sdf-1α)的表达,并以Sdf-1α依赖的方式间接抑制癌细胞趋化因子(C-C基序)配体2(Ccl 2)的表达。miR-126/miR-126* 表达在癌细胞中通过其宿主基因Egfl 7的启动子甲基化下调。这些发现确定了这种microRNA对如何改变原发性肿瘤微环境的组成以促进乳腺癌转移,并证明了miR-126/126* 下调与乳腺癌患者无转移生存率差之间的相关性。
The tumour stroma is an active participant during cancer progression. Stromal cells promote tumour progression and metastasis through multiple mechanisms including enhancing tumour invasiveness and angiogenesis, and suppressing immune surveillance. We report here that miR-126/miR-126*, a microRNA pair derived from a single precursor, independently suppress the sequential recruitment of mesenchymal stem cells and inflammatory monocytes into the tumour stroma to inhibit lung metastasis by breast tumour cells in a mouse xenograft model. miR-126/miR-126* directly inhibit stromal cell-derived factor-1 alpha (Sdf-1α) expression, and indirectly suppress the expression of chemokine (C–C motif) ligand 2 (Ccl2) by cancer cells in an Sdf-1α-dependent manner. miR-126/miR-126* expression is downregulated in cancer cells by promoter methylation of their host gene Egfl7. These findings determine how this microRNA pair alters the composition of the primary tumour microenvironment to favour breast cancer metastasis, and demonstrate a correlation between miR-126/126* downregulation and poor metastasis-free survival of breast cancer patients.
癌症刺激的间充质干细胞通过前列腺素 E2 信号传导创建癌干细胞生态位。
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