Kinetic studies on the inhibitions of mast cell chymase by natural serine protease inhibitors: indications for potential biological functions of these inhibitors |
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Authors: | N Fukusen Y Kato H Kido N Katunuma |
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Affiliation: | Department of Enzyme Chemistry, School of Medicine, University of Tokushima, Japan. |
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Abstract: | We have found that degranulation from mast cells is specifically inhibited by the inhibitors of chymase (10). Among the natural serine protease inhibitors tested, Bowman-Birk soybean protease inhibitor, Eglin C, and human alpha 1-antichymotrypsin inhibited chymase more strongly than did chymostatin, Kunitz soybean protease inhibitor, and phosphatidylserine. Of the inhibitors tested, Bowman-Birk soybean protease inhibitor was the strongest inhibitor of chymase, its Ki value being 13.2 X 10(-9) M. Kinetic studies showed that these inhibitors were all noncompetitive inhibitors of chymase. Bowman-Birk and Kunitz soybean protease inhibitors inhibited both chymotrypsin-type and trypsin-type serine proteases but Eglin C specifically inhibited chymotrypsin-type proteases. |
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