Exosomes from BM-MSCs increase the population of CSCs via transfer of miR-142-3p.

Exosomes from BM-MSCs increase the population of CSCs via transfer of miR-142-3p.
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来自 BM-MSC 的外泌体通过 miR-142-3p 的转移增加 CSC 的数量

DOI:
10.1038/s41416-018-0254-z
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发表时间:
2018-09
影响因子:
8.8
通讯作者:
Li F
Li F
中科院分区:
医学1区
文献类型:
--
作者:
Li H;Li F

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背景骨髓源性间充质干细胞/基质细胞(BM-MSC)是祖细胞,可迁移至肿瘤并参与肿瘤微环境。 BM-MSC 通过释放细胞因子或外泌体在肿瘤过程中发挥重要作用;然而,BM-MSC如何影响结肠癌细胞中CSC的干性仍知之甚少。方法我们从BM-MSC中分离出外泌体,并使用这些外泌体治疗结肠癌细胞(HCT-116、HT-29和SW-480)。我们通过细胞表面标记物(CD133 和 Lgr5)和功能测定(如化疗耐药、集落形成、细胞粘附、侵袭和肿瘤形成测定)比较了结肠 CSC 的干性特征。我们进行了 microRNA 阵列来研究结肠癌细胞、BM-MSC 和共培养细胞之间外泌体 microRNA 表达的差异,并对基因靶标进行功能和分子分析。结果在这项研究中,我们发现 BM-MSC 衍生的外泌体含有不同的 microRNA,包括 miR-142-3p,这反过来又增加了结肠癌细胞中 CSC 的数量。从 BM-MSC 衍生的外泌体中去除 miR-142-3p 明显减少了结肠 CSC 的数量。从机制上讲,Numb被发现是miR-142-3p的靶基因,miR-142-3p通过下调Numb促进Notch信号通路。结论我们的研究结果表明BM-MSC衍生的外泌体通过miR-142-3p促进结肠癌干细胞样特征。
BackgroundBone marrow-derived mesenchymal stem/stromal cells (BM-MSCs) are progenitor cells shown to migrate to the tumour and participate in the tumour microenvironment. BM-MSCs play important roles in tumour processes through the release of cytokines or exosomes; however, how BM-MSCs influence the stemness of CSCs in colon cancer cells remains poorly understood.MethodsWe isolated exosomes from BM-MSCs and used these exosomes to treat colon cancer cells (HCT-116, HT-29 and SW-480). We compared stemness traits of colon CSCs by cell surface marker (CD133 and Lgr5) and functional assays, such as chemoresistance, colony formation, cell adhesion, invasion and tumour-formation assay. We performed a microRNA array to investigate the differences in exosomal microRNA expression between colon cancer cells, BM-MSCs and co-cultured cells and performed functional and molecular analysis of the gene targets.ResultsIn this study, we found that BM-MSC-derived exosomes contained distinct microRNAs, including miR-142-3p, which in turn increased the population of CSCs in colon cancer cells. Depriving miR-142-3p from BM-MSC-derived exosomes clearly decreased the population of colon CSCs. Mechanistically, Numb was found to be the target gene of miR-142-3p, and miR-142-3p promoted the Notch signalling pathway by downregulating Numb.ConclusionsOur findings indicate that BM-MSC-derived exosomes promote colon cancer stem cell-like traits via miR-142-3p.
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