AIM: To investigate the inhibition of the recombinant human endostatin adenavirus(Ad-Es)on the experimental choroidal neovascularization(CNV)models by intravitreous injection.

METHODS: Experimental CNV models were induced by semiconductor laser in 30 male Brown Norway(BN)rats and randomly divided into 3 groups with 10 rats in each group. At 21d after photocoagulation, the single administration group were given intravitreous injection with Ad-Es 0.01mL; the repeated administration group were given intravitreous injection with Ad-Es 0.01mL and a repeated injection 7d later; the saline control group were given intravitreous injection with saline 0.01mL. At 7d after final administration, the leakage of fundus fluorescein angiography(FFA)was observed. Various CNV areas were measured by using laser confocal microscopy of choroidal flatmount method. Pathology and ultrastructure were observed with light microscopy, the expressions of CD105 were measured by immunohistochemistry.

RESULTS: The leakage of CNV of the administration group abviously decreased as compared with those in the saline group, the leakage of repeated administration group decreased compared with that of single administration group(P<0.05). Laser confocal microscope quantitative CNV analysis showed that CNV area of the administration group was significantly smaller than that of control group, the area of repeated administration group was smaller than that of single administration group(P<0.05). Under the light microscope, the vascular endothelial cell number and quantity of the administration group were significantly lower than that of the control group, the cell number of repeated administration group was lower than that of single administration group. CD105 expression of the administration group was significantly weaker than that in the saline group; the expression of repeated administration group was weaker than that of single administration group.

CONCLUSION: Ad-Es can effectively inhibit semiconductor laser induced CNV in BN rats, and the inhibition effect of repeated administration group is better than that of single administration group. It may be a useful new method in the treatment of CNV.