Microfilament regulatory protein MENA increases activity of RhoA and promotes metastasis of hepatocellular carcinoma

Mammalian enabled (MENA), usually known as a direct regulator of microfilament polymerization and bundling, promotes metastasis in various cancers. Here we focus on the role of MENA in hepatocellular carcinoma (HCC) metastasis and the relevant mechanism from the view of RhoA activity regulation. By HCC tissue microarray analysis, we found that MENA expression was positively associated with satellite lesions (P<0.01) and vascular invasion (P<0.01). Cases with membrane reinforcement of MENA staining in HCC tissues had significantly higher rates of early recurrence in the intermediate MENA expression group. Knockdown of MENA significantly suppressed HCC cell migration and invasion in vitro, as well as their intrahepatic and distant metastasis in vivo. Knockdown of MENA also decreased filopodia and stress fibers in SMMC-7721 cells. Furthermore, a decrease of RhoA activity was detected by a pull-down assay in SMMC-7721-shMENA cells. The ROCK inhibitor, Y-27632, suppressed migration of both MENA knockdown SMMC-7721 cells and control cells, but diminished their difference. Thus, our findings suggest that MENA promotes HCC cell motility by activating RhoA.     

探讨三种对比剂在MRU检查中的应用

目的探讨三种对比剂在泌尿系水成像(MRurography,MRU)检查前作为胃肠道准备的对比剂的效果性价比。材料和方法采用GESigna1.5T磁共振扫描仪对542例分别服用BaSO4、Gd-DTPA、枸橼酸铁铵三种对比剂做胃肠道准备后进行MRU检查。结果全部病例均能显示MRU的整个图像,服用造影剂后产生胃肠道伪影的病例数明显减少。结论由此可见在做MRU检查前作好胃肠道的准备是很重要的。且钆苯酸葡胺的性价比在三者中最优,采用5‰钆苯酸葡胺作为MRU检查前的胃肠道准备对比剂,是较为理想的。