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Human umbilical-vein endothelial cells (HUVECs) were cultured, and their inositol phosphate formation and Ca2+ mobilization in response to thrombin and histamine were studied. Evidence from measurement of intracellular Ca2+ in the absence of extracellular Ca2+ established that the two agonists were both acting on a single cell population, and suggested that a Ca2+-influx component was stimulated which was dependent on receptor-occupancy. After 30 s of stimulation in the presence of 10 mM-LiCl, the effects of 20 microM-histamine and 1 unit of thrombin/ml on formation of inositol phosphates were additive, but at 5 min they were not. HUVECs labelled with myo-[3H]inositol for 72 h synthesized radiolabelled inositol pentakis- and hexakis-phosphate. The predominant isomers of inositol mono-, bis- and tris-phosphates whose formation was stimulated were the 4-phosphate, the 1,4-bisphosphate and the 1,3,4-trisphosphate.

Inositol phosphate production and Ca2+ mobilization in human umbilical-vein endothelial cells stimulated by thrombin and histamine