Cancer Cell:重磅!三阴性乳腺癌根源现世!这个基因是罪魁祸首!

2018-09-04 Ruthy,Zoe 转化医学网

目前,科学家仍对三阴性乳腺癌(triple negative breast cancer, TNBC)束手无策,其预后极差、死亡率极高,传统疗法收效甚微,是乳腺癌中恶性程度最高的亚型之一。在多方疗法尝试受阻后,研究人员转而试图探寻TNBC发病根源,进而在根源上阻断肿瘤的发生。近日,美国Salk实验室的Geoffrey Wahl教授等人在著名学术期刊《Cancer Cell》发表的一篇文章描述了TN


导  读

目前,科学家仍对三阴性乳腺癌(triple negative breast cancer, TNBC)束手无策,其预后极差、死亡率极高,传统疗法收效甚微,是乳腺癌中恶性程度最高的亚型之一。在多方疗法尝试受阻后,研究人员转而试图探寻TNBC发病根源,进而在根源上阻断肿瘤的发生。近日,美国Salk实验室的Geoffrey Wahl教授等人在著名学术期刊《Cancer Cell》发表的一篇文章描述了TNBC的根源性病因!他们指出TNBC应归咎于SOX10基因的高表达!因此,SOX10有望成为该肿瘤的治疗靶点!

其实,过往早有研究指出SOX10与乳腺癌的发病有关,可以作为诊断标记物。但是,这些结论多流于统计层面,SOX10在乳腺癌发病中的作用始终扑朔迷离,更遑论其对TNBC的意义。

有数据显示,SOX10在TNBC中的阳性率高达69%,远远高于其他乳腺癌亚型,也就是说,TNBC中SOX10的表达具有特殊性,因此,Geoffrey Wahl教授等人猜测SOX10或许是导致乳腺癌具备致命特性的关键驱动因素。

SOX10在TNBC中高表达

我们知道,TNBC是指雌激素受体(ER)、孕激素受体(PR)和人表皮生长因子受体2(Her-2)均为阴性的一种乳腺癌,目前对三阴性乳腺癌治疗手段比较单一,主要依靠化疗,内分泌治疗和分子靶向治疗均无效,而且容易复发和转移。

为什么TNBC的恶性程度如此之强呢?这就要怪责TNBC的超强异质性了。肿瘤异质性越强,自然越容易耐药、转移,治疗效果自然不尽如人意。所以,找寻TNBC的发病根源问题,其实就是破解TNBC异质性的成因,而SOX10高表达对TNBC的异质性的形成功不可没。

SOX10高表达使细胞“返祖”与去分化

胚胎发育过程中,细胞会逐渐关闭一些基因的表达,确保细胞分化成不同的组织、器官。而细胞发生癌变后,经过多次分裂增殖,其子细胞会打开一些已被关闭的基因表达通路,使细胞去分化,恢复细胞的分化潜能,从而使肿瘤的生长速度、侵袭能力、对药物的敏感性、预后等各方面产生差异。

研究人员发现,在TNBC中,正是SOX10早已被关闭的表达通路被重启,SOX10高表达,导致细胞“返祖”,才极大地增强了TNBC细胞的生长速度、侵袭能力,并引发多药耐药属性,使TNBC“脱颖而出”,肆意生长,造成患者极差预后和极高死亡率。

染色质状态与SOX10通路关系

SOX10表达通路是怎样重启的呢?简单说来,正常情况下,SOX10所在的DNA应该被染色质包裹,形成稳定的染色体,不再表达,而细胞癌变并多次分裂增殖后,维持SOX10稳定的系统崩解,DNA外的染色质解体,露出了SOX10,而且这段基因变得极具“亲和力”,基因表达所需的原料如mRNA等都快速在该基因附近聚集,实现了该基因的高表达。

而且,SOX10的表达产物还可以进入其他肿瘤细胞,“解放”其他DNA并与之结合,启动肿瘤细胞的其他发育进程。也就是说,SOX10表达重启意味着大量被关闭的基因表达重启,肿瘤自然获得异质性,高侵袭性和转移性、耐药性也随之而来。

更有意思的是,研究人员发现,一旦关闭了SOX10表达通路,即使细胞编程后癌变,依旧不具备侵袭性和耐药性。而且,SOX10表达水平越高,肿瘤细胞的“野性”就越强,另外,SOX10蛋白与其他DNA的结合能力也决定了肿瘤异质性的高低。所以,SOX10高表达是TNBC发病的真正根由,想要掐断病源,就不容忽视SOX10。

当然,阻断SOX10的策略仍需要进一步开发,并且必须进行安全性测试,以确定它们是否会影响正常的细胞功能。然而,这项研究提出了治疗TNBC 的新途径,这对广大TNBC患者来说是绝处逢生,希望早一日成功应用于临床,拯救更多TNBC,更多家庭。

原始出处:

Christopher Dravis,et al.Epigenetic and Transcriptomic Profiling of Mammary Gland Development and Tumor Models Disclose Regulators of Cell State Plasticity.Cancer Cell.Published:August 30, 2018DOI:https://doi.org/10.1016/j.ccell.2018.08.001

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    2019-05-23 维他命
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    2018-09-11 1235d9a8m36(暂无昵称)

    学习了

    0

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    2018-09-06 xlysu
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    2018-09-06 xxxx1054
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    2018-09-05 kafei

    学习了谢谢

    0

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    2018-09-04 lietome15

    好文,值得点赞!认真学习,应用于实践!谢谢分享给广大同好!

    0

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转移性三阴性乳腺癌侵袭性强,往往预后较差。tnAcity试验评估了蛋白结合型紫杉醇联合卡铂(nab-P/C),蛋白结合型紫杉醇联合吉西他滨(nab-P/G)和吉西他滨联合卡铂(G/C)作为一线疗法治疗转移性三阴性乳腺癌患者的安全性和有效性。

依地福新可防止乳腺癌细胞在大脑中的激活

近日,研究人员使用计算机模型证明现有的用于白血病患者治疗的药物依地福新,依地福新可以阻断转移到大脑的三阴性乳腺癌细胞的激活。

PNAS:TDP43可以作为三阴性乳腺癌治疗的潜在靶标

三阴性乳腺癌(TNBC)是一类恶性程度较高的乳腺癌分型。相对于其他类型的乳腺癌,三阴性乳腺癌表现出转移率高、细胞增殖快和预后差等特征。目前缺乏三阴型乳腺癌的成功靶向药物。

Signal Transduct Target Ther:靶向MUC1-C可抑制三阴性乳腺癌中的BCL2A1

B细胞淋巴瘤2相关蛋白A1(BCL2A1)是抗细胞凋亡蛋白BCL-2家族的成员,是导致抗癌药物治疗抗性的主要因素,但是目前还没有针对BCL2A1的药物。MUC1-C癌蛋白在三阴性乳腺癌(TNBCs)细胞中异常表达,诱导上皮-间质转化(EMT)并促进抗癌药物抗性。本研究表明,在TNBCs细胞中靶向MUC1-C可导致BCL2A1表达的下调。结果显示,MUC1-C通过NF-κBp65介导的机制激活BCL