目的:探讨长链非编码RNA (long noncoding RNA,lncRNA)BX357664在肾癌组织中的表达并研究其对Caki-1和Caki-2细胞上皮间质转化过程的影响.方法:以前期芯片检测结果经标准化分析确认在肾癌组织中表达明显低于癌旁正常组织的IncRNA BX357664为目标,采用逆转录-聚合酶链反应(qRT-PCR)检测其在24对肾癌组织和Caki-1以及Caki-2细胞中的表达情况;lncRNA BX357664慢病毒载体感染Caki-1和Caki-2细胞后,Transwell迁移和侵袭实验分别检测细胞迁移和侵袭能力的改变;Western blot检测Caki-1和Caki-2细胞处理组和对照组中上皮间质转化相关蛋白的表达情况.结果:lncRNA BX357664在24对肾癌组织和Caki-1、Caki-2细胞中表达水平降低(P＜ 0.05);lncRNA BX357664慢病毒过表达载体感染Caki-1和Caki-2细胞后能够显著抑制细胞迁移(P＜0.01)和侵袭能力(P＜0.01),显著改变上皮间质转化相关蛋白的表达,抑制上皮间质转化的进程(P＜0.05).结论:lncRNA BX357664在肾癌中显著低表达,在Caki-1和Caki-2细胞中上调lncRNA BX357664能够通过抑制上皮间质转化过程,从而抑制肿瘤细胞的转移和侵袭.“,”Objective:To investigate the expression of lncRNA BX357664 in human renal cell carcinoma (RCC) and its function in epithelial-to-mesenchymal transition (EMT) in Caki-1 and Caki-2 RCC cells.Methods:Downregulated LncRNA BX357664 was confirmed in RCC tumor tissues by previous lncRNA microarray.Real-time PCR was performed to analyze the expression of lncRNA BX357664 in 24 pairs of human RCC samples, Caki-1 and Caki-2 cells, respectively.Transwell migration and invasion assays were performed to detect the ability of migration and invasion in transfected Caki-1 and Caki-2 cells, respectively.Western blotting assay was carried out to identify the relative proteins in EMT process which affected RCC metastasis by lncRNA BX357664.Results:LncRNA BX357664 was downregulated in 24 pairs of RCC samples, Caki-1 and Caki-2 RCC cells, respectively(both P ＜ 0.05).Overexpression of lncRNA BX357664 suppressed migration (P ＜ 0.01) and invasion (P ＜ 0.01) by inhibiting EMT in Caki-1 and Caki-2 cells.The expressions of EMT related proteins were significantly changed, and the process of EMT was inhibited(P ＜ 0.05).Conclusion:LncRNA BX357664 was downregulated in RCC and could inhibit the ability of migration and invasion in Caki-1 and Caki-2 cells by blocking EMT.