Abstract
Effects of human urine-derived endogenous digitalis-like factor (EDLF) and ouabain on endothelin (ET) secretion were examined in cultured endothelial cells. ET was secreted in a linear fashion over 5 hours from bovine pulmonary artery endothelium into serum-free medium. EDLF stimulated ET secretion in a dose-dependent manner. In contrast, ouabain did not affect ET secretion at the concentration of 10(-9)-10(-5) M. These results indicate that human urine-derived EDLF is distinct from plant-derived ouabain and act as a stimulator of ET secretion by endothelial cells.
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