Gastroenterology:肝癌MUC15水平下降与患者生存期缩短相关

2013-12-24 佚名 环球医学

来自第二军医大学附属东方肝胆外科医院的研究人员证实,MUC5抑制了EGFR二聚化及PI3K-AKT信号,且与患者的侵袭性肝癌相关。这一研究发现发表在12月的国际胃肠病学杂志上。 中国工程院院士王红阳(Hong-yang Wang)教授和第二军医大学的周伟平(Weiping Zhou)教授是这篇论文的共同通讯作者。王红阳院士长期从事恶性肿瘤的基础与临床研究,对肿瘤发生发

来自第二军医大学附属东方肝胆外科医院的研究人员证实,MUC5抑制了EGFR二聚化及PI3K-AKT信号,且与患者的侵袭性肝癌相关。这一研究发现发表在12月的国际胃肠病学杂志上。

中国工程院院士王红阳(Hong-yang Wang)教授和第二军医大学的周伟平(Weiping Zhou)教授是这篇论文的共同通讯作者。王红阳院士长期从事恶性肿瘤的基础与临床研究,对肿瘤发生发展的分子病理机制和细胞信号转导有重要建树。迄今在Cancer Cell、Nature等有影响的主流期刊发表论文100多篇。周伟平教授擅长肝脏良恶性肿瘤疾病的手术治疗,尤其是临近大血管的肿瘤切除。

MUC15是一种在结肠直肠腺癌形成过程的异常表达的蛋白,且有研究报道它可以阻止人类胎盘滋养层侵袭,但目前对于MUC15在肝细胞癌(HCC)发病机制中所起的作用却并不清楚。

在这篇文章中,研究人员对从313名患者处收集的肝癌样本和匹配的非肿瘤肝组织(对照)进行了分析。这313名患者自2006年1月到2009年9月在上海接受了肝切除术。采用免疫组化、定量RT-PCR和免疫印迹分析等方法确定了mRNAs和蛋白质的水平。

分析结果揭示,相比对照组织,更大比例的肝癌样本MUC15的mRNA和蛋白质水平降低。MUC15水平下降的肿瘤更有可能具有侵袭性特征,例如高水平α-fetoprotein、血管侵袭性及不良分化等。且肿瘤MUC15水平降低的患者具有更短的总生存时间,且疾病复发时间也更短。在两种肝癌细胞系中稳定表达MUC15可在体外抑制它们增殖和侵袭特性,并减小它们在小鼠体内形成转移瘤的能力。

机制研究表明,MUC15通过PI3K- v-akt鼠胸腺瘤病毒原癌基因同系物信号,减少了基质金属蛋白酶MMP2和MMP7的转录,并促进了MMP2组织抑制物的表达。MUC15与EGFR之间的物理互作导致了EGFR在早期内体中再定位及降解,是失活PI3K- v-akt鼠胸腺瘤病毒原癌基因同系物信号的必要条件。

这些研究结果表明了,在肝癌中MUC15水平降低与患者生存期缩短以及疾病复发时间缩短有关。在肝癌细胞中表达MUC15可以通过抑制EGFR二聚化以及通过v-akt鼠胸腺瘤病毒原癌基因同系物来降低PI3K信号,在体外及小鼠中减少细胞的侵袭行为。

原文出处:

Wang RY, Chen L, Chen HY, Hu L, Li L, Sun HY, Jiang F, Zhao J, Liu GM, Tang J, Chen CY, Yang YC, Chang YX, Liu H, Zhang J, Yang Y, Huang G, Shen F, Wu MC, Zhou WP, Wang HY.MUC15 Inhibits Dimerization of EGFR and PI3K-AKT Signaling and Is Associated With Aggressive Hepatocellular Carcinomas in Patients.Gastroenterology. 2013 Dec;145(6):1436-1448.e12. doi: 10.1053/j.gastro.2013.08.009.

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    2014-03-14 许安
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