[Long non-coding RNA LOC101927476 inhibits invasion, migration, and proliferation of ovarian cancer cell lines]

Objective: To investigate the expression of long non-coding RNA LOC101927476 (LncRNA LOC101927476) in ovarian cancer and its effect on the biological characteristics of ovarian cancer. Methods: Patients with ovarian cancer who underwent surgery in Cancer Hospital of Chinese Academy of Medical Sciences from 2018 to 2019 were selected. The expressions of LOC101927476 in ovarian cancer cells 3AO, OVCA429, TOV21G, A2780, SKOV3, as well as 22 primary tumor tissues and their matched metastatic tumor tissues were detected by real-time quantitative polymerase chain reaction (RT-PCR). Ovarian cancer transcriptome sequencing data from the TCGA database was used to verify the expressions of LOC101927476 and GATA4. 3AO and OVCA429 cells were infected with lentivirus plasmid containing OE-LOC101927476 and single guide RNA (sg-RNA) targeting LOC101927476, respectively. The effects of LOC101927476 on migration and invasion were detected by Transwell and wound healing assay. The effect of LOC101927476 on cell proliferation was detected by cell counting kit-8 (CCK-8) assay. Results: RT-PCR assay showed that 20 out of 22 patients had significantly lower expression of LOC101927476 in their metastatic tumors compared with primary tumors. Transwell assay showed that overexpression of LOC101927476 significantly inhibited the invasion and migration capacities of 3AO cells. The numbers of invading and migrating 3AO cells infected with OE-LOC101927476 lentivirus were (357±63) and (699±65), respectively, lower than (661±95) and (1 024±76) in OE-EV group (P<0.050). In contrast, the numbers of invading and migrating OVCA429 cells with LOC101927476 knockdown were (512±72) and (472±40), respectively, higher than (309±13) and (363±27) in sg-Control group (P<0.050). Wound healing assay results showed that after 48 hours, the percentage of scratch healing of 3AO cells in OE-LOC101927476 group was (10.86±0.63)%, significantly lower than (57.38±4.42)% of OE-EV group (P=0.009). After 24 hours, the percentage of scratch healing of OCVA429 cells in sg-LOC101927476 group was (59.98±1.34)%, significantly higher than (23.15±2.03)% of sg-Control group (P=0.004). CCK-8 assays showed that the OD value of 3AO cells in OE-LOC101927476 group was (2.07±0.08), significantly lower than (2.29±0.04) of OE-EV group (P=0.009). The OD value of OVCA429 cells in sg-LOC101927476 group was (2.13±0.03), significantly higher than (1.93±0.03) of sg-Control group (P=0.001). The relative expression of GATA4 in OE-LOC101927476 group was (1.86±0.25), significantly higher than 1.00 of OE-EV group (P=0.001). In patients with high expression of LncRNA LOC101927476, the expression level of GATA4 was (2.93±0.35), which was higher than (0.29±0.06) of LOC101927476 low expression group (P=0.001). Conclusion: LncRNA LOC101927476 can inhibit the invasion, migration and proliferation of ovarian cancer cells.