The effect of endostatin evaluated in an experimental animal model of collagen-induced arthritis

OBJECTIVE: To investigate the arthritis-inhibiting effect of endostatin, a potent angiogenesis inhibitor, on type II collagen-induced arthritis (CIA). METHODS: In an experimental system of prophylactic administration, endostatin was administered once daily at 1 mg/kg/day or 10 mg/kg/day for 2 weeks from before the onset of arthritis. In the experimental system of therapeutic administration, mice with an arthritis score of 1 to 3 were administered endostatin once daily at 10 mg/kg. In the experimental system of continuous administration, endostatin was administered using an osmotic pump capable of continuously administering a calculated dose of 1 mg/kg/day for 2 weeks. RESULTS: Arthritis scores were lower in a dose-dependent manner in the prophylactic administration group than in the control group. Arthritis scores were lower in the therapeutic administration group than in the control group. Compared with the once-daily dosage regimen, the administration of endostatin by an osmotic pump achieved a similar arthritis-inhibiting effect at one-tenth of the dose. CONCLUSION: Both prophylactic and therapeutic administration of endostatin inhibited type II CIA in mice. The administration method using an osmotic pump is useful.