Cell Death Dis:肺转移性乳腺癌干细胞被发现

2017-04-12 黄辛 中国科学报/

中科院上海生科院人口健康领域胡国宏研究组研究鉴定出了一个具有肺转移能力的乳腺癌干细胞亚群,并揭示其在乳腺癌转移中的作用机制。相关研究成果已在线发表于《细胞死亡与疾病》。



中科院上海生科院人口健康领域胡国宏研究组研究鉴定出了一个具有肺转移能力的乳腺癌干细胞亚群,并揭示其在乳腺癌转移中的作用机制。相关研究成果已在线发表于《细胞死亡与疾病》。

肿瘤干细胞是引起肿瘤发生、促进肿瘤发展、导致肿瘤转移的罪魁祸首。近几年,在胰腺癌结直肠癌中的研究表明,肿瘤干细胞具有异质性。然而,在乳腺癌中,肿瘤干细胞在转移能力上是否具有异质性仍旧不得而知。

科研人员发现一个表达 CD44v 剪切体的乳腺癌干细胞亚群具有显着更强的肺转移能力,在乳腺癌向肺组织的转移中起到重要作用。在这群具有强肺转能力的乳腺癌干细胞中,ESRP1 的表达水平较高,ESRP1 通过 mRNA 可变剪切调控使 CD44mRNA 前体的表达从 CD44s 向 CD44v 转变。

进一步研究表明,这些转移性乳腺癌干细胞膜上的 CD44v 可以与肺组织中的 OPN 相互作用,在 OPN 的刺激下增强肿瘤细胞的浸润能力,从而促进肿瘤细胞向肺转移。在乳腺癌临床样本中,ESRP1 和 CD44v 的高表达,而不是 CD44s 和总 CD44 的表达,与病人发生远端转移的不良预后正相关。

专家表示,这项研究在乳腺癌中验证了肿瘤干细胞的异质性,发现了一个表达 CD44v 的乳腺癌干细胞亚群具有强肺转移能力,并揭示了这群转移性肿瘤干细胞在肺转移中的作用机制,提示在乳腺癌的诊断、预后和治疗中,CD44v 和 ESRP1 是更有效的标志物和药物靶点。

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    2017-08-19 维他命
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