Circular RNA Circrna_0072387 Promotes Hepatoblastoma Progression by Regulating Hsa-Mir-490/Histone Deacetylase 2 Axis

Circular RNAs have been reported to be associated with the occurrence and progress of various cancers. However, its biological roles in hepatoblastoma (HB) remain undefined. This study intended to explain a possible mechanism of hsa_circ_0072387 (circ72387) in hepatoblastoma progression. The expression of circ72387, hsa-miR-490 (miR490) and histone deacetylase 2 (HDAC2) in HB tissues and cell lines (HepG2/Huh6) were determined by quantitative realtime polymerase chain reaction (qPCR) or Western blot. Cell Counting Kit-8 (CCK-8) and colony formation assay were used to detect the proliferation of HB cell lines. The interaction between miR490 with circ72387 was predicted by CircInteractome and was verified by Dual-Luciferase reporter assay while the interaction between miR490 with HDAC2 was predicted by Targetscan and was verified by western blotting assay. Results showed that circ72387 was upregulated in both HB tissues and cells, and miR490 was downregulated in HB cells. Furthermore, the silence of circ72387 suppressed the proliferation of hepatoblastoma cells. Circ72387 promoted the proliferation of HB cells through competitively binding to HDAC2 against miR490 acting as a Sponge of miR490 in HB. Circ72387 played an essential role in HB development through the circ72387-miR490-HDAC2 regulatory axis, which may pave the way for potential diagnostic markers and therapeutic targets research in HB.