LncRNA CCAT1 contributes to the growth and invasion of gastric cancer via targeting miR-219-1.

Gastric cancer (GC) is one of the most malignant tumors that seriously threaten to human health. Increased reports indicated that long non-coding RNAs (lncRNAs) were associated with GC. This study aims to investigate the regulatory role of colon cancer associated transcript-1 (CCAT1) in GC. The results exhibited that CCAT1 was higher expressed in 57 GC tissue samples than in 57 paired adjacent normal tissue samples. The expression of CCAT1 was also increased in GC cell lines (MKN45, Hs746T and SGC-7901) compared with gastric epithelial cell line GES-1. Besides, decreased cell proliferation with increased cell apoptosis were detected in SGC-7902 cells transfected with CCAT1 shRNA. At the same time, lower cell invasion ability was measured in SCG-7901 cells transfected with CCAT1-shRNA. In addition, miR-219-1 was predicted and convinced a direct target of CCAT1. The expression of miR-219-1 was declined in GC tissues and GC cell lines. Further studies demonstrated that the roles of CCAT1 on cell proliferation, apoptosis and invasion were inhibited by miR-219-1. At last, the in vivo experiment indicated that tumor growth of GC was suppressed through knockdown of CCAT1. In conclusion, these results suggested that CAT1 promotes the tumorigenesis and progression of GC by negative-regulating miR-219-1. This article is protected by copyright. All rights reserved. This article is protected by copyright. All rights reserved.