Objective To explore the effects and mechanism of long non-coding RNA HLA complex group 18 (HCG18)on human ovarian cancer cell SKOV3 and its cisplatin resistance cell line SKOV3/DDP. Methods RT-PCR was used to detect the expression levels of HCG18 and miR-449 in SKOV3 and SKOV3/DDP cells. Cells were transfected with HCG18 siRNA and treated with DDP (12.5 μg/ml). After 48 h, we evaluated cell viability using the MTT assay, examined cell apoptosis and cell cycle through flow cytometry, and confirmed targeting binding of HCG18, miR-449, and Wnt1 with luciferase reporter assay. Results Compared with the human normal ovarian epithelial cell line NOEC, the HCG18 level was significantly increased (P<0.05), and the miR-449 level was significantly decreased in SKOV3 (P<0.05). Compared with the transfection control group, in the DDP-treated cells (both SKOV3 and SKOV3/DDP), we observed significantly reduced cell viability, enhanced cell apoptosis, and cell cycle G2/M phase arrest (P<0.05). Transfection of MiR-449 inhibitor partly reversed the effects of HCG18 siRNA on cell viability, cell apoptosis, and cell cycle in both SKOV3 and SKOV3/DDP cells (P<0.05). The luciferase reporter results showed that HCG18 could bind to the 3'-UTR of miR-449, and miR-449 could bind to the 3'-UTR of Wnt1. Transfection of HCG18 siRNA significantly increased the levels of miR-449 (P<0.05). Transfection of HCG18 siRNA or miR-449 mimic significantly decreased the mRNA levels of Wnt1(P<0.05). Conclusions HCG18 knockdown could inhibit cell viability, promote cell apoptosis and cell cycle G2/M phase arrest through miR-449/Wnt1 signaling pathway, and thus promote cisplatin sensitivity of human ovarian cancer cells.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |