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Recent studies revealed that several Long noncoding RNAs (LncRNAs) are associated with progression of gastric cancer (GC), while the functional role and molecular mechanism of many GC-associated lncRNAs remain undetermined. The tumor suppressor-gene retinoblastoma gene (RB1) was decreased in several human cancers including gastric cancer (GC). In this study, we investigated whether Linc00441 was involved in the suppression of RB1. Our findings showed that the up-regulated Linc00441 was inversely correlated with RB1 expression in human GC tumor samples. The gain- and loss-of-function investigation revealed that Linc00441 could promote the proliferation of GC cells. Furthermore, RNA pull down and RIP assays demonstrated that Linc00441 could recruit DNMT1 to the RB1 promoter and suppressed RB1 expression in GC cells. In conclusion, our findings revealed that Linc00441 played crucial role in GC progression and suggested that Linc00441 was potentially an effective target for GC therapy in the future.

Linc00441 interacts with DNMT1 to regulate RB1 gene methylation and expression in gastric cancer