Impact of endostatin on bFGF-induced proliferation, migration, and matrix metalloproteinase-2 expression/secretion of bovine choroidal endothelial cells

Purpose: To investigate the potential role of endostatin, an endogenous angiogenesis inhibitor, in the prevention of choroidal angiogenesis-related disorders. Methods: Bovine choroidal endothelial cells (CEC) were cultured and treated with basic fibroblast growth factor ( bFGF) alone or combined with endostatin at concentrations ranging from 0.1 to 10 mu g/ml. The proliferation and migration of CECs were evaluated by using 3,(4,5-dimethylthiazol-2-yl)-2,5diphenyl tetrazolium bromide (MTT) colorimetric assay and modified Boyden chamber assay, respectively. For evaluating expression and secretion of matrix metalloproteinase-2 ( MMP-2), CEC-conditioned media were subjected to zymography and/or Western blot analysis, and the cells were used for semiquantitative reverse transcription polymerase chain reaction (RT-PCR) analysis. Results: Endostatin did not inhibit bFGF-induced or nonstimulated CEC proliferation ( p > 0.05). The bFGF-induced migration was significantly inhibited by endostatin at concentrations of 1 and 10 mu g/ml ( p < 0.05). The bFGF-upregulated expression of mRNA in CECs and the secretion of MMP-2 protein of CECs were both suppressed by endostatin. Conclusions: Inhibitory effect of endostatin on expression and secretion of MMP-2 and cell migration, but not on proliferation of CECs, could respond to its therapeutic action for choroidal neovascularization-dependent disorders.