Inhibition of chymase reduces vascular proliferation in dog grafted veins

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Abstract
We investigated the effect of a chymase inhibitor Suc‐Val‐Pro‐PheP(OPh)2 on the proliferation of the grafted vein in dog. By 28 days after the operation, the mean intimal area of the grafted vein in the placebo group was 3.24±0.32 mm2. The intimal area of the grafted vein in the chymase inhibitor‐treated group was reduced to 63.9%. In the placebo group, the activities of chymase and angiotensin‐converting enzyme in grafted vein were significantly increased 15‐ and 2‐fold, respectively. In the chymase inhibitor‐treated group, chymase activity in the grafted veins was decreased significantly. These findings suggest that inhibition of chymase appears useful for preventing vascular proliferation.