Inhibition of long non-coding RNA TUG1 on gastric cancer cell transference and invasion through regulating and controlling the expression of miR-144/c-Met axis

ABSTRACT

Objective To discuss the expression of long noncoding RNA TUG1 (lncRNA-TUG1) in gastric carcinoma (GC) and its effects on the transferring and invading capacity of gastric carcinoma cells. Methods Forty cases of carcinoma tissue and para-carcinoma tissue were selected from GC patients who underwent surgical removal in Zhejiang Provincial Hospital of Chinese Traditional Medicine and Wenzhou Central Hospital from January, 2013 to December, 2014; the expressing level of lncRNA-TUG1 in GC and para-C tissues was detected by applying the qRT-PCR technique. The correlation between lncRNA-TUG1 expression and patients' clinical data was classified and analyzed. SGC-7901 cells were transfected using lncRNA-TUG1 specific siRNA. Changes of the transferring and invading capacity of siRNA-transfected SGC-7901 cells were scratch-tested and transwell-detected. qRT-PCR was applied to detect the expression level of microRNA-144 after lncRNA-TUG1 was silenced. Changes of c-Met mRNA and protein expressions was detected by qRT-PCR and western-blot test. Results The expression level of lncRNA-TUG1 in GC tissue was significant higher than that in para-C tissue (P < 0.05) and the high expression level of lncRNA-TUG1 in GC tissue was significantly correlated with tumor lymph nodes metastasis and advance TNM phasing (P < 0.05). The transferring and invading capacity of SGC-7901 cells was highly inhibited after being transfected by lncRNA-TUG1 specific siRNA (P < 0.05). The results of qRT-PCR and western-blot proved that the expression of microRNA-144 was significantly boosted and the expression level of c-Met mRNA and protein was inhibited after lncRNA-TUG1 was silenced (P < 0.05). Conclusions lncRNA-TUG1 shows an up-regulated expression in GC tissue and that bears a correlation with clinicopathological features of malignant tumor. lncRNA-TUG1 can promote the transferring and invading capacity of GC by inhibiting the pathway of microRNA-144/c-Met.