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Gallbladder carcinoma (GBC), the most common malignant tumour of the bile duct, is highly aggressive and has a poor prognosis. MicroRNA-30a-5p (miR-30a-5p) is an important tumour suppressor that participates in many aspects of carcinogenesis and cancer development. However, the role of miR-30a-5p in GBC development remains to be determined, as do the mechanisms underlying its effects in GBC. Using samples collected from 42 subjects with gallbladder carcinoma (GBC), we showed decreased miR-30a-5p expression in the primary lesions vs. non-tumour adjacent tissues (NATs). Decreased miR-30a-5p was associated with shorter disease-free survival (DFS) and overall survival (OS). Inhibiting miR-30a-5p expression in 2 representative GBC cell lines (GBC-SD and NOZ) increased cell proliferation, migration, invasiveness, as well as β-catenin nuclear translocation, vice versa. In nude mice, NOZ cells transfected with miR-30a-5p mimics grew slower (vs. miR-NC) upon subcutaneous inoculation, and had lower rate of hepatic metastasis upon spleen inoculation. Dual luciferase assay confirmed that E2F transcription factor 7 (E2F7) was a direct target of miR-30a-5p and antagonized the effects induced by miR-30a-5p downregulation in GBC cells. MiR-30a-5p attenuates the EMT and metastasis in GBC cells by targeting E2F7, suggesting miR-30a-5p is a tumour suppressor that may serve as a novel potential prognostic biomarker or molecular therapeutic target for GBC.

MicroRNA-30a-5p inhibits gallbladder cancer cell proliferation, migration and metastasis by targeting E2F7