Phosphoramidon inhibits the intracellular conversion of big endothelin-1 to endothelin-1 in cultured endothelial cells |
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| Authors: | T Sawamura Y Kasuya Y Matsushita N Suzuki O Shinmi N Kishi Y Sugita M Yanagisawa K Goto T Masaki |
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| Affiliation: | Department of Biochemistry, University of Tsukuba, Ibaraki, Japan. |
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| Abstract: | Effects of various protease inhibitors on the conversion of big endothelin (ET)-1 to ET-1 in cultured endothelial cells were analyzed. A metal protease inhibitor, phosphoramidon, decreases the amount of ET-1 and increase that of big ET-1 released. This effect is dose-dependent and not nonspecific. When the contents of ET-1 and big ET-1 in the cells after culturing in the medium with or without phosphoramidon were measured, the ratio of ET-1: big ET-1 in the cells was 3.3 : 1 and phosphoramidon inverted the ratio in the cells to 1 : 3.5. These data strongly suggest that a phosphoramidon-sensitive protease converts big ET-1 to mature ET-1 intracellularly. |
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