LncRNA-TCONS_00026907 is involved in the progression and prognosis of cervical cancer through inhibiting miR-143-5p

Our previous long noncoding RNA (lncRNA) microarray revealed that lncRNA-TCONS_00026907 is aberrantly expressed between cervical cancer tissues and adjacent tissues. This study aims to explore the potential role of TCONS_00026907 in the development of cervical cancer. The expression levels of TCONS_00026907 in cervical cancer tissues and adjacent tissues from 83 patients of cervical cancer were detected by quantitative real-time polymerase chain reaction and the survival rate was analyzed. In vitro, HeLa and SiHa cells were transfected with small hairpin RNA (shRNA)-TCONS_00026907, then cell proliferation, cycle distribution, apoptosis, migration and invasion were measured. To confirm TCONS_00026907 regulates expression of ELK1 through inhibiting miR-143-5p, overexpression of miR-143-5p and silencing of ELK1 were, respectively, performed in HeLa and SiHa cells. Results showed that TCONS_00026907 level was significantly higher in cervical cancer tissues compared to noncancerous tissues and the survival rate was lower in the high expression group. Silencing of TCONS_00026907, overexpression of miR-143-5p and silencing of ELK1 inhibited cervical cell cycle, proliferation, migration, and invasion, but promoted apoptosis, respectively. Furthermore, silencing of TCONS_00026907 suppressed the growth of cervical tumors and altered the expression of ELK1, p-ELK1, C-fos, Cyclin D1 and Bcl-2 in vivo. Our study identifies TCONS_00026907 as a potent proto-oncogene and indicates that TCONS_00026907/miR143-5p/ELK1 regulatory pathway plays an important role in cervical cancer.