STIMULATION OF LUNG SURFACTANT SECRETION BY ENDOTHELIN-1 FROM RAT ALVEOLAR TYPE-II CELLS

Endothelin-1 (ET-1), a potent vasoactive peptide released by endothelial cells, alters cytosolic Ca2+ and phosphoinositide metabolism in cells of myogenic and nonmyogenic origin. We evaluated the effect of ET-1 on surfactant phosphatidylcholine (PC) secretion from alveolar type II cells labeled with [methyl-H-3]choline. ET-1 stimulated the secretion of PC in a time- and dose-dependent manner. Binding of I-125- labeled ET-1 to type II cell membranes was saturable at similar to 1 nM and suggested the presence of a single type of receptor. The secretagogue effect of ET-1 was independently inhibited by nifedipine and nitrendipine, both L-type calcium channel blockers, and removal of extracellular calcium. ET-1 also increased cellular diacylglycerol content by similar to 50% within 30 s, which could not be attenuated by pretreatment with nifedipine, suggesting an early activation of protein kinase C that was independent of Ca2+ influx. Further, ET-1-stimulated PC secretion was also blocked by inhibitors of protein kinase C. Collectively, these results indicate that the binding of ET-1 to type II cells is coupled to the activation of protein kinase C, which increases calcium influx through L-type calcium channels, and results in increased secretion of lung surfactant. Since ET-1 is released from pulmonary micro- and macrovasculature endothelial cells in close proximity to type II cells, our findings support the novel concept that endothelial cells interact with alveolar type II cells in a paracrine fashion to regulate surfactant secretion.