LncRNA TPTEP1 inhibits the migration and invasion of gastric cancer cells through miR-548d-3p/KLF9/PER1 axis

Background: Despite the development of many methods and new therapeutic agents, the survival and prognosis of patients with gastric cancer are still poor. The role of TPTEP1 in gastric cancer has not been reported. Methods: Wound healing assay and transwell assay analysis TPTEP1/miR-548d-3p/KLF9/PER1 effect on migration and invasiveness of gastric cells. Western blot and RT-qPCR certificate TPTEP1/miR-548d-3p/KLF9/ PER1transcription and expression of migration and invasion related genes. Luciferase assay was used to deter-mine the adsorption of miR-548d-3p by TPTEP1 sponge, the targeting of miR-548d-3p to KLF9, and the binding of KLF9 to the promoter of PER1. immunohistochemical assay and H & E staining prove the function of TPTEP1 and miR-548d-3p in nude mice model of gastric cancer. Results: TPTEP1 inhibited its expression by sponge adsorption of miR-548d-3p. miR-548d-3p targets KLF9 3'UTR to inhibit its expression, and KLF9 binds to the PER1 promoter to promote its expression.TPTEP1/KLF9/PER1 inhibits gastric cancer cell migration and invasion, and miR-548d-3p does the opposite. Conclusions: Our data suggest that TPTEP1 affects gastric cancer progression by regulating the miR-548d-3p/ KLF9/PER1 axis. Targeting this pathway may provide new therapeutic opportunities for gastric cancer.