RAB5A对人肺腺癌细胞系侵袭转移作用的研究

目的：探讨RAB5A基因在人肺腺癌细胞系侵袭和转移中的作用。方法：采用体外重建基底膜侵袭实验和癌细胞粘附能力；癌细胞趋化性运动能力、癌细胞分泌明胶酶的能力及活性的测定，分析RAB5A正义真核表达载体转染后的AGZY83－a和反义RNA转染后的Anip973细胞的侵袭、转移能力的改变。结果：RAB5A正义表达载体PcDNA3.1-RAB5A转染的AGZY83－a重建基底膜侵袭能力明显增强，统计学意义显著（P＜0．0005），细胞趋化性运动能力显著增高（P＜0．0005），对基底膜成分的粘附能力增大（P＜0．05），以及明胶酶分泌及活性增强等一系列趋向Anip973的变化。PcDNA3-AntiRAB5A反义RNA表达载体对Anip973重建基底膜侵袭力明显下降（P＜0．0025），趋化性运动能力显著降低（P＜0．005），对基底膜成分粘附能力降低（P＜0．05），以及明胶酶分泌减少等一系列趋向AGZY83－a的变化。结论：RAB5A在肺腺癌侵袭轩移表型形成中发挥重要的作用。反义RNA可阻断RAB5A基因的翻译过程。

The effect of RAB5A gene over-expression on invasive and metastatic capabilities of human lung adenocarcinoma cell lines

Objective Over-expression of RAB5A gene has been proved to be associated with neoplasia metastasis. This study is to explore the effect of RAB5A gene on invasion and metastasis of human lung adenocarcinoma cell lines. Methods Constituted basement membrane invasion technique, adhesion capability of tumor cell assay, the chemotactic migration of tumor cells assay, and gelatinases SDS-PAGE analysis method were used to detect the changes of invasive and metastatic capability of Anip973 (with high metastatic capability) and its parent AGZY83-a cell lines (with low metastatic capability). Results After AGZY83-a cells were transfected by PcDNA3.1-RAB5A plasmid, its invasion was significantly increased (t=24.36, P<0.000 5); adhesion capability of cell was promoted (P<0.05); the chemotactic migration of cells was higher than that of the parent lines (t=14.18, P< 0.000 5); and the activity of gelatinases secreted from transfected AGZY83-a was enhanced. The invasion of the transfected Anip973 cells with PcDNA3-AntiRAB5A was lower (t= 16.510 4, P<0.002 5); adhesion capability of cell was decreased (P<0.05); the chemotactic migration of cells was lower than that of the parent lines (t=6.062, P<0.005); and the activity of gelatinases was obviously decreased. Conclusion This study in vitro indicates that over-expression of RAB5A genes plays an important role in tumor invasion and metastatic phenotype formation of human lung adenocarcinoma cells; and antisense RNA can interrupt the translation of RAB5A gene.