Regulation of Bradykinin-Stimulated Cation Entry Into Endothelial Cells by tyrosine Kinase

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In endothelial cells, bradykinin stimulates the release of intracellular Ca^<2+>, which is followed by the entry of extracellular Ca^<2+> into the cells. However, the mechanism underlying this Ca^<2+> entry is not well understood. To investigate the possible implication of tyrosine kinases in bradykinin-mediated Ca^<2+> signaling in endothelial cells, cultured porcine aortic endothelial cells were loaded with fura-2/AM, and Mn^<2+> influx into the cells was determined by the quenching of fluorescence intensity of fura-2 at 360 nm excitation. The tyrosine kinase inhibitors genistein and herbimycin A attenuated not only Ca^<2+> influx but also Mn^<2+> influx from the extracellular space without affecting the release of Ca^<2+> from internal stores in bradykinin-treated cells. In contrast to tyrosine kinase inhibitors, the tyrosine phosphatase inhibitor vanadate stimulated Ca^<2+> influx as well as Mn^<2+> influx. On the other hand, both an inactive analog of genistein, daidzein, and an inhibitor of diacylglycerol (DAG) kinase, ethylene glycol dioctanoate, were without effect on [Ca^<2+>]_i following the stimulation of agonist. These findings suggest that tyrosine kinase is involved in the regulation of cation influx in endothelial cells.
社団法人日本循環器学会の論文
1997-11-20