Nat Cell Biol:新型蛋白ASPP2可控制上皮细胞可塑性且抑制癌症转移

2014-11-03 佚名 生物谷

近日,来自牛津大学的科学家通过研究,揭示了控制机体上皮细胞形状和运动状态发生转变的关键机制,相关研究刊登于国际杂志Nature Cell Biology上;文章中研究者表示,名为ASPP2的肿瘤抑制蛋白的功能就好比是一种分子开关,其可以控制并且逆转机体上皮细胞的形状及运动状态的改变,这对于解释一系列生化现象,比如伤口愈合、胚胎发育及癌症转移都非常关键。 研究者Xin Lu表示,目前我们尽力去

近日,来自牛津大学的科学家通过研究,揭示了控制机体上皮细胞形状和运动状态发生转变的关键机制,相关研究刊登于国际杂志Nature Cell Biology上;文章中研究者表示,名为ASPP2的肿瘤抑制蛋白的功能就好比是一种分子开关,其可以控制并且逆转机体上皮细胞的形状及运动状态的改变,这对于解释一系列生化现象,比如伤口愈合、胚胎发育及癌症转移都非常关键。

研究者Xin Lu表示,目前我们尽力去鉴别出控制控制上皮细胞可塑性的分子开关,这样的可塑性是癌症的标志,为了发生转移,癌细胞会疏松自身的结构,不断摆动脱离母体肿瘤组织,进而在机体其它组织器官部位“安家”,上述的过程就称为上皮细胞向间充质细胞的转分化过程及间质细胞向上皮细胞的转化过程(EMT及MET)。

研究者发现,在肾小管的发育过程中ASPP2蛋白会促使MET过程的发生,从而过滤掉机体血液中的废弃物,而当ASPP2蛋白缺失时会促进EMT过程的发生,尤其是在表达常见癌症基因RAS细胞中,EMT过程尤为明显,从而就会引发癌症发生转移。随后研究人员对小鼠模型进行试验发现,当小鼠机体中乳腺癌细胞表达较低水平的ASPP2时,其就会大量转移至大脑细胞中,如果这些乳腺癌细胞表达较足量的ASPP2,其转移的能力就会明显下降。

对从病人机体分离的肝脏及乳腺肿瘤组织进行分析,研究者发现,癌症中ASPP2表达的欠缺和病人较低的生存率直接相关;蛋白ASPP2可以通过和E-钙粘蛋白及β-连环蛋白的关联来控制MET和EMT过程。最后研究者Lu表示,近些年来我们已经对驱动EMT的过程研究地非常多了,但是对于MET过程的发生却知之甚少,而MET过程对于机体的健康及癌症的转移又至关重要,而本文的最大亮点就是我们鉴别出了MET的诱导子及守护者,这对于后期开发治疗癌症的新型靶向疗法提供了新的研究思路和依据。

原始出处:

Wang Y1, Bu F2, Royer C1, Serres S3, Larkin JR3, Soto MS3, Sibson NR3, Salter V1, Fritzsche F4, Turnquist C1, Koch S1, Zak J1, Zhong S1, Wu G5, Liang A5, Olofsen PA1, Moch H6, Hancock DC7, Downward J7, Goldin RD8, Zhao J2, Tong X2, Guo Y2, Lu X1.ASPP2 controls epithelial plasticity and inhibits metastasis through β-catenin-dependent regulation of ZEB1.Nat Cell Biol. 2014 Nov;16(11):1092-104. doi: 10.1038/ncb3050. Epub 2014 Oct 26.

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    2015-10-16 liye789132251
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    2014-12-15 维他命
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    2015-07-06 sunylz
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    2014-11-05 makuansheng

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细胞的细胞膜是细胞与外界环境交换信息的一个信号界面,这一结构由脂质和蛋白组成,后者包含有跨膜蛋白和脂质蛋白,通过共价键进一步修饰,添加糖能形成糖蛋白。癌细胞比健康细胞糖蛋白的水平更高,如mucin-1,个别糖蛋白还可以传递环境信号,直接促进恶性肿瘤发生。糖蛋白也能相互组织,形成糖萼(glycocalyx)。近期在这一方面,来自康奈尔大学的研究人员发现了这种包被在细胞膜上的蛋白的物理特征是如何调控细

Cell:揪出癌症盔甲的薄弱环节

来自约翰霍普金斯大学的细胞生物学家们发现了一种独特的乳腺癌细胞类型,证实其导致了癌症侵袭到周围组织中。由于侵袭是致命的癌症转移过程的第一步,研究人员说他们或许已经找到了癌症盔甲的薄弱环节以及有可能的治疗新靶点。他们的研究结果在线发表在12月12日的《细胞》(Cell)杂志上。 约翰霍普金斯大学医学院细胞生物学助理教授Andrew Ewald博士说:“转移是乳腺癌患者面

PNAS:绘制癌转移的发展史

肿瘤能够通过转移扩散到机体的其他部分,但人们对这一过程并不十分了解。此前,研究者们一直难以确定转移发生在原发瘤发育的什么阶段,或者特定转移瘤是否直接来自于原发瘤。现在,科学家们开发了一个简单的新方法,能够快速分析患者体内多个肿瘤位点之间的进化关系,为制定合适的治疗方案提供宝贵信息。 “构建患者体内所有肿瘤的‘家谱’,不仅可以帮助我们确定肿瘤之间的差异,还有助于了解肿瘤的发展史,”文章的通讯作

抗疟疾药物氯奎宁或可有效抑制癌症的侵袭转移

近日,来自法兰德斯大学联办生物技术研究院的研究人员在对实验动物进行研究时发现,抗疟疾药物氯奎宁或具有明显的抗癌效应,截至目前,研究者们推测氯喹可以增加癌细胞对化疗的敏感性。研究者表示,氯奎宁同样可以使得肿瘤组织的异常血管正常化,结果从一方面来讲会增加癌细胞的屏障功能,进而阻断癌细胞的扩散和转移;从另一方面将则会增强肿瘤的灌注,使得其对化疗作用更为敏感。 氯奎宁是一种常见的用于治疗疟疾及