RESUMEN
Objective To detect the expression levels of miR-7-5p and POLE4 in non-small cell lung cancer cells and their effect on cells proliferation, migration and invasion. Methods qRT-PCR was used to detect the relative expression levels of miR-7-5p and POLE4 mRNA in NSCLC tissues, adjacent tissues, tumor cells and human normal bronchial epithelial cells. Luciferase reporter gene was used for analyzing of the targeting relation between POLE4 and miR-7-5p in NSCLC cells. si-NC and si-POLE4 were transfected into SPC-A-1 cells as the si-NC group and si-POLE4 group, and the control group was set at the same time. MTT method, scratch test and Transwell test were used to detect cell proliferation, migration and invasion. Results The expression levels of miR-7-5p in NSCLC tissues and cells were reduced, and the expression levels of POLE4 were increased. miR-7-5p could target to combine with POLE4. After 72 hours of culture, the OD value in si-POLE4 group was significantly lower than those in the control group and si-NC group (P < 0.05). The migration rate and the number of transmembrane cells in the si-POLE4 group cultured for 48 hours were lower than those in the control group and the si-NC group (P < 0.05). Conclusion miR-7-5p may inhibit the proliferation, migration and invasion of non-small cell lung cancer cells by targeting POLE4.
RESUMEN
Objective MicroRNAs are differentially expressed in colorectal cancer tumor tissues and adjacent normal tissues, which play an important role in the development of colorectal cancer. This study aims to investigate the expression of microRNA-7-5p in colorectal cancer patients and its influence on the proliferation and apoptosis of colon cancer cell CaCo2. Methods The high-throughput microarray was used to screen differentially expressed microRNAs, and real-time quantitative PCR (RT-PCR) was used to detect the expression of microRNA-7-5p in 10 cases of colorectal cancer patients and corresponding adjacent normal tissues. Western blot was performed to detect the expression of intestinal trefoil factor (TFF3) in different tissues and CaCo2 cells after transfection with microRNA-7-5p. The expression of TFF3 in different tissues and CaCo2 cells transfected with microRNA-7-5p was detected. TUNEL combined with flow cytometry was used to detect the apoptosis of CaCo2 cells after transfection. The CCK-8 assay was used to detect the proliferation of CaCo2 cells after transfection. Results The relative expression of MicroRNA-7-5p in colorectal cancer tissue was 0.409 ± 0.095, which was significantly lower than that of normal tissue adjacent to cancer (1.000 ± 0.014), and the difference was statistically significant (P <0.01). The relative expression of TFF3 in colorectal cancer tissues was significantly higher than that in normal adjacent tissues (P <0.01). The relative expression of TFF3 in CaCo2 cells decreased in the overexpressed microRNA-7-5p of the control group (0.729 ± 0.041). The proliferation ability (0.930 ± 0.007) was significantly lower in the blank control group (0.990 ± 0.005) (P <0.01), and it could increase the proportion of early apoptotic cells (50.700 ± 0.989) and late apoptotic cells (40.525 ± 0.515). Conclusion MicroRNA-7-5p is lowly expressed in colorectal cancer and is associated with the occurrence and development of colorectal cancer. Up-regulated microRNA-7-5p inhibits the proliferation of colon cancer cell CaCo2 and promotes its apoptosis.