Bovine adrenocortical cells from the zona fasciculata/reticularis were isolated and their phosphoinositides labelled to a steady state with [3H]inositol in primary culture. Experiments performed on these cells in the presence of Li+ have shown that, over a period of 60min, angiotensin II (AII; 10−7m) stimulated a linear increase in [3H] inositol phosphates that was sustained through the utilization of two hormone-sensitive subpools of prelabelled lipid (30% and 45% respectively), and a rapid resynthesis of [3H]phosphoinositide into one of these pools using cytosolic [3H]inositol. The 30% pool was used immediately on stimulation, and was sustained at a steady-state size of 10–15% during the first 30 min of stimulation through rapid resynthesis using cytosolic [3H]inositol. Only after 30min, when the cytosolic [3H]inositol was depleted and resynthesis could no longer occur, did the additional 45% pool start to supply further substrate to the phospholipase C, thereby further sustaining the generation of [3H]inositol phosphates. Once this pool was depleted however (by approximately 60min), [3H]inositol phosphate generation finally ceased. These findings establish the differential use of two metabolically distinct hormone-sensitive pools of phosphoinositide following AII stimulation in bovine adrenocortical cells, events which are dependent upon the availability of cytosolic inositol for phosphoinositide resynthesis.
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