ABSTRACT
Objective: To investigate the changes of expressions of the related genes in the triple-negative breast cancer (TNBC) MDA-MB-231 cells after knockout of Rab7a gene, and to elucidate the roles of Rab7a-related genes in TNBC. Methods: The breast cancer ZR-75-30, MCF-7, T-47D, MDA-MB-231 and HCC-1937 cells in the logarithmic phase were selected. The expression levels of Rab7a protein in the breast cancer ZR-75-30, MCF-7, T-47D, MDA-MB-231, and HCC-1937 cells were detected by Western blotting method. The Rab7a gene in the MDA-MB-231 cells was knockout with lentivirus and the cells were divided into negative control group and Rab7a knockout group. According to the four different knockout Rab7a sequences, the Rab7a knockout group was divided into KD1 group, KD2 group, KD3 group and KD4 group. The knockout efficiencies of Rab7a gene in the MDA-MB-231 cells in various groups were detected by qPCR method, the differential genes in the highest knockout efficiency group (KD2 group) and negative control group were detected by full gene expression microarray, and the interaction between Rab7a gene and other genes was analyzed by integrated pathway analysis (IPA) software. Results: The Rab7a protein was expressed in the TNBC MDA-MB-231 cells. Compared with negative control group, the knockout efficiency of Rab7a gene in the MDA-MB-231 cells in KD2 group was the highest (P