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We examined the effects of KD3-671 (2-propyl-8-oxo-1-[(2'-(H-tetrazole-5-yl)biphenyl-4-yl)methyl]-4,5,6,7-tetrahydrocycloheptimidazole), an angiotensin II type1 receptor antagonist, on an experimental rat model of mesangioproliferative glomerulonephritis, anti-Thy-1 nephritis. Anti-Thy-1 nephritis was induced by intravenous injection of 300 microg/kg of anti-Thy-1.1 monoclonal antibody into rats. KD3-671 (3, 10, 30 mg/kg per day) or enalapril (30 mg/kg per day), an angiotensin II converting enzyme inhibitor, was given p.o. once daily from the day before the antibody injection (the 1st day) to the 15th day after. KD3-671 significantly inhibited an increase in the number of total and proliferating cell nuclear antigen-positive cells and the deposition of alpha-smooth muscle actin and fibronectin in the glomeruli of nephritic rats, but enalapril (30 mg/kg per day) suppressed only the number of total cells and the deposition of alpha-smooth muscle actin in the glomeruli. Moreover, to elucidate the effect of KD3-671 on matrix deposition in the glomeruli, we measured the production of fibronectin in isolated glomeruli obtained from anti-Thy-1 nephritic rats. The glomeruli in anti-Thy-1 nephritic rats produced more fibronectin than that in control rats. KD3-671 (10(-8), 10(-7), 10(-6) M) dose-dependently attenuated fibronectin production in isolated nephritic glomeruli. These findings suggest that KD3-671 may be an effective agent for the treatment of mesangioproliferative glomerulonephritis.

Effects of KD3-671, an Angiotensin II Type 1 Receptor Antagonist, on Anti-Thy-1 Nephritis in Rats