JBC:中国医学科学院解析抑癌miRNA

2013-10-09 佚名 生物通

来自中国医学科学院的研究人员在新研究中证实,miRNA-200b通过影响Pin1的表达控制了失巢凋亡(anoikis),且miRNA-200b的表达受到两个ETS家族成员PEA3和ELK-1的调控。这些研究发现在线发表在9月26日的《生物化学杂志》(JBC)上   【原文下载】 论文的通讯作者是中国医学科学院北京协和医学院的刘志华(Zhihua Liu)博士。其回国前曾在美国

来自中国医学科学院的研究人员在新研究中证实,miRNA-200b通过影响Pin1的表达控制了失巢凋亡(anoikis),且miRNA-200b的表达受到两个ETS家族成员PEA3和ELK-1的调控。这些研究发现在线发表在9月26日的《生物化学杂志》(JBC)上   【原文下载】

论文的通讯作者是中国医学科学院北京协和医学院的刘志华(Zhihua Liu)博士。其回国前曾在美国哈佛大学从事生物医学和计算生物学方面的研究工作,目前主要研究方向是计算生物学和系统生物学。

转移是恶性肿瘤最重要的一个特征。转移的基本步骤包括局部侵袭、进入血管(或淋巴管)、在循环中生存、渗出血管(淋巴管)、移植到新位点,及定植。在癌细胞离开原发肿瘤后,它们必须以一种“流离”(homeless)状态生存。这要求它们具备抗失巢凋亡的能力,而这种能力的调控涉及到多个信号机制。

MicroRNAs (miRNAs)是一类长度为19-23个核苷酸(nt)的非编码小RNA分子,可以通过与靶mRNA的3‘非翻译区(3’UTR)相互作用来调控基因的转录后表达。近年来的研究已揭示了各种各样与癌症转移相关的miRNAs。其中,miRNA-200s家族通过沉默E-cadherin的转录抑制子ZEB1/2来调节上皮间质转化(EMT)过程,由此影响了癌症转移。miRNA-200s下调减少了E-cadherin的表达,导致癌细胞容易脱离原发肿瘤,从而使癌细胞处于一种流离状态。这些癌细胞必须随后获得抗失巢凋亡的能力。

miRNA-200s包括有5个成员:miRNA-200a、miRNA-141、miRNA-200b、miRNA-200c和miRNA-429,根据它们的功能可被分为两个亚家族。近期的而一些研究揭示了miRNA-200s家族在失巢凋亡中起重要的作用,第一次证实miRNA-200c通过TrkB介导了失巢凋亡。但对于miRNA-200s家族其他成员是否也参与了失巢凋亡还不是清楚。

在这篇文章中,研究人员证实miRNA-200b通过直接靶向Pin1 mRNA的3‘UTR,在转录水平上调控了Pin1的表达。他们发现在转录过程中miRNA-200b下调可促进癌细胞生存。研究人员证实MCF-7细胞系处于游离状态导致了miRNA-200b表达下降。他们还发现在淋巴结转移过程中人类乳腺癌中的miRNA-200b表达也下调,这与Pin1的表达呈显著负相关。

他们还证实,两个EST家族成员PEA3和ELK-1调控了miRNA-200b的表达。PEA3可促进miRNA-200b表达,ELK-1则是miRNA-200b的转录抑制子。此外,miRNA-200b还通过Pin-1-pERK信号通路调控了PEA3和ELK-1的活性,由此形成了自我调控反馈环路。

新研究确定了miRNA-200b对失巢凋亡的调控作用及分子机制,并揭示了在转移过程中它自身的表达调控机制。

原文检索

Zhang X, Zhang B, Gao J, Wang X, Liu Z.Regulation of the miRNA-200b by transcriptional regulators PEA3 and ELK-1 affects expression of Pin1 to control anoikis.J Biol Chem. 2013 Sep 26.  【原文下载】

 

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    2013-11-28 hongbochen
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    2014-08-07 smallant2002
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    2014-03-02 lily1616
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    2013-10-11 Homburg

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