Mechanism of FGF7 gene silencing in regulating viability, apoptosis, invasion of retinoblastoma cell line HXO-Rb44 and angiogenesis.

OBJECTIVE: To explore the mechanism of fibroblast growth factor 7 (FGF7) gene silencing in regulating viability, apoptosis, invasion of retinoblastoma (RB) cell line HXO-Rb44 and angiogenesis. MATERIALS AND METHODS: Human normal retinal vascular endothelial cells ACBRI-181 was set as the normal group. The cultured RB cell lines HXO-Rb44 were divided into three groups: the blank group (without plasmid transfection), negative control group (transfection of FGF7 plasmid), and the si-FGF7 group (transfection of FGF7 siRNA plasmid). Quantitative Real Time-Polymerase Chain Reaction and Western blot were used to measure the mRNA and protein expression of B-cell lymphoma 2 (Bcl-2), Bcl-2-associated X protein (Bax), vascular endothelial growth factor (VEGF), basic fibroblast growth factor (bFGF), angiopoietin-2 (Ang-2), and proliferating cell nuclear antigen (PCNA) in each group. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, transwell invasion assay, and flow cytometry were used, respectively, to assess cell viability, invasive capability, and cell apoptosis in each group. RESULTS: The mRNA and protein expression of FGF7, Bcl-2, VEGF, bFGF, Ang-2, and PCNA were significantly decreased, and the mRNA and protein expression of Bax were significantly increased in the si-FGF7 group than in the blank group (all p<0.05). Compared with the blank group, the si-FGF7 group had significantly decreased cells invasive capability, cell viability at 48 h and 72 h and proliferation, and significantly increased apoptosis rate (all p<0.05). CONCLUSIONS: FGF7 gene silencing can inhibit the viability and invasion of RB cells and the expression of angiogenesis-related factors and can promote RB apoptosis.