RhoC基因对肝癌细胞促血管生长因子表达的影响

目的:观察RhoC基因对肝癌HepG2细胞表达促血管生长因子（VEGF，bFGF）的影响。 方法:将pcDNA3.1-RhoC重组质粒和空载体pcDNA3.1转染HepG2细胞，用RT-PCR及免疫组化检测HepG2细胞的RhoC mRNA及RhoC蛋白表达情况;RT-PCR及免疫组化检测HepG2细胞VEGF和bFGFmRNA及蛋白的表达。将转染pcDNA3.1-RhoC重组质粒和空载体pcDNA3.1的HepG2细胞接种裸鼠，观察肿瘤的成瘤率。结果:与转染空载体pcDNA3.1的HepG2细胞相比，转染pcDNA3.1-RhoC重组质粒的细胞表达RhoC mRNA及RhoC 蛋白增强，其表达VEGF和bFGFmRNA及蛋白明显增强（P＜0.01）;重组质粒转染组成瘤率高于空载体组。结论:RhoC表达可促进HepG2细胞表达血管内皮生成因子。RhoC可促进肝癌细胞分泌促血管生长因子，可能是促进肝癌侵袭、转移的机制之一。

The influence of RhoC on the expression of angiogenic factors in HCC cells

Objective To study the influence of pcDNA3.1-RhoC on the expression of endogenous angiogenic factors in HCC cells.Methods The reconstructed plasmid pcDNA3.1-RhoC was transfected into HepG2 cells, and expression of VEGF and bFGF was detected with the RT-PCR and immunohistochemical stain. HepG2 cells transfected with pcDNA3.1-RhoC or pcDNA3.1 were implanted into nude mice to observe the tumor occurrence rate.Results HepG2 cells transfected with pcDNA3.1/RhoC showed higher expression of RhoC . The expression of RhoC enhanced the expression of VEGF and bFGF(P<0.01).The tumor occurrence rate in nude mice implanted with HepG2 cells transfected with pcDNA3.1-RhoC(20 %) was higher than those implanted with HepG2 cells transfected with pcDNA3.1 (0 %).Conclusions The expression of RhoC efficiently enhances the expression of VEGF and bFGF;RhoC can promote the expression of angiogenic factors in HCC cell, and it may be one of the mechanisms of RhoC for enhancement of invasion and metastasis of HCC.