Objective: This study was designed to investigate the effect of long non-coding RNA (lncRNA) OIP5-AS1 on cell migration and invasion of gallbladder cancer (GBC) and its specific mechanism.
Methods: The expressions of lncRNA OIP5-AS1 and miR-143-3p  in GBC cell lines (GBC-SD, SGC996 and NOZ) and gallbladder epithelial cells (HGBE cells) were measured by qRT-PCR. After loss- and gain-of-function experiments for OIP5-AS1 and miR-143-3p  in GBC-SD cells, CCK-8 was applied to examine cell viability, cell scratch assay to measure cell migration, and transwell chamber to inspect cell invasion capacity. The interaction between OIP5-AS1 and miR-143-3p  was predicted by StarBase. Then, luciferase reporter gene assay and RNA pull-down were used to verify the targeting relationship between miR-143-3p  and OIP5-AS1.
Results: OIP5-AS1 was highly expressed and miR-143-3p  was downregulated in GBC cell lines, when compared with HGBE cells. Overexpression of OIP5-AS1 or downregulation of miR-143-3p  facilitated GBC-SD cell invasion, proliferation and migration, while different expression patterns were found in GBC-SD cells in response to OIP5-AS1 suppression or miR-143-3p  overexpression. OIP5-AS1 negatively mediated miR-143-3p . MiR-143-3p  upregulation partially reversed the inhibitory effect of OIP5-AS1 knockdown on GBC-SD cell activities.
Conclusion: LncRNA OIP5-AS1 accelerates the progression of GBC by suppressing miR-143-3p.
Keywords: OIP5-AS1, miR-143-3p , gallbladder cancer, proliferation, migration, invasion