Gastroenterology:MiR-212靶向调控MnSOD的表达促进结直肠癌转移

2013-09-05 佚名 丁香园

众所周知,影响microRNA分子的功能与肿瘤发生发展密切相关。miR-212是由一个非蛋白编码基因的内含子转录而来的。研究报道miR-212在多种肿瘤中存在表达下调。 中山大学孙逸仙肿瘤研究中心华南肿瘤学国家重点实验室Xiangqi Meng等人探究了miR-212在结直肠癌发生发展过程中的可能机制。

众所周知,影响microRNA分子的功能与肿瘤发生发展密切相关。miR-212是由一个非蛋白编码基因的内含子转录而来的。研究报道miR-212在多种肿瘤中存在表达下调。

中山大学孙逸仙肿瘤研究中心华南肿瘤学国家重点实验室Xiangqi Meng等人探究了miR-212在结直肠癌发生发展过程中的可能机制。【原文阅读】

作者采用实时定量PCR的方法检测了miR-212在不同结直肠癌细胞株和180对结肠癌组织及其配对癌旁正常组织中的表达。在结直肠癌细胞株中过表达和敲除miR-212的表达,在体外实验中检测其功能。利用在HCT116细胞株中过表达miR-212后,研究该细胞株在裸鼠成瘤中的作用以及其影响侵袭转移的能力。

体内实验结果表明,过表达miR-212可以抑制结直肠癌细胞侵袭转移,并减少肝内和肺转移的形成。进一步鉴定发现MnSOD(锰超氧化物歧化酶)的信使RNA是miR-212直接调控靶基因。蛋白水平在结直肠癌组织样本中观察到miR-212的表达与MinSOD的表达成负相关。

MnSOD在结肠癌细胞中是参与下调上皮标志物表达而上调间质标志物表达的酶类,也就是说MnSOD可促进上皮间质转化。而过表达miR-212可以下调MnSOD的表达而阻断上皮间质化的进程。杂合性缺失和启动子区高甲基化是导致结肠癌中miR-212下调的原因。miR-212表达下调的结肠癌侵袭性表型程度越高,miR-212低表达结肠癌患者的无病生存时间也越短(P = .0045; overall survival, P = .0015)。

该项研究表明miR-212通过遗传学及表观遗传学的因素在结直肠癌患者肿瘤组织中表达下调。miR-212可能通过靶向调节MnSOD的mRNA的活性来影响其表达,达到预防肿瘤进展的作用。miR-212表达下调具有成为结直肠癌患者预后标志物的潜质。miR-212和MnSOD也有可能成为肿瘤的治疗靶点。

原文阅读

Meng X, Wu J, Pan C, Wang H, Ying X, Zhou Y, Yu H, Zuo Y, Pan Z, Liu RY, Huang W.Genetic and Epigenetic Down-regulation of MicroRNA-212 Promotes Colorectal Tumor Metastasis via Dysregulation of MnSOD.Gastroenterology. 2013 Aug;145(2):426-436.e6. doi: 10.1053/j.gastro.2013.04.004. 

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    2014-01-22 许安
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    2013-10-21 smallant2002
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