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When intracellular free Ca2+ concentration [( Ca2+]i) was monitored in fura2-loaded Swiss 3T3 cells, endothelin increased [Ca2+]i in a dose-dependent manner; after the addition of endothelin, an initial transient peak was observed immediately and was followed by a sustained increase in [Ca2+]i lasting at least 5 min. 45Ca2+ efflux and influx experiments in endothelin-stimulated Swiss 3T3 cells revealed that the change in [Ca2+]i could be explained by a dual mechanism; an initial transient peak induced mainly by the release of Ca2+ from intracellular stores and the sustained increase by an influx of extracellular Ca2+. Cellular generation of inositol 1,4,5-trisphosphate and cyclic AMP were not induced by endothelin, suggesting that other cellular mediators with the capacity to release Ca2+ from intracellular stores play a significant role in the signal transduction pathway of endothelin in Swiss 3T3 cells.
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