Abstract
Phosphoinositide turnover is known to play an important role in intracellular free calcium homeostasis through the inositol trisphophate-mediated release of calcium from intracellular stores. We find that the other product of phosphoinositide turnover, 1,2-diacylglycerol, elicits an increase in intracellular free calcium in HL60 cells which is due, at least in part, to release of calcium from intracellular stores. This effect is specific for calcium, since intracellular sodium and potassium levels and cellular volume were unaffected. Concomitant with the intracellular calcium increase, we find an increase in cellular inositol trisphosphate levels, suggesting that the effect of diacylglycerol on calcium may be mediated by inositol trisphosphate. Diacylglycerols also stimulate calcium efflux. This stimulation is not simply due to the increase in intracellular calcium. These effects appear not to be mediated through stimulation of a phorbol ester-activatable protein kinase C (Ca2+/phospholipid-dependent enzyme) since phorbol esters do not elicit an increase in cytoplasmic free calcium or an increase in calcium efflux.
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