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The effect of platelet-activating factor (PAF) on polyphosphoinositide metabolism and 45Ca2+ efflux was examined in a vascular smooth muscle cell line (A7r5). PAF stimulated a rapid but transient production of inositol trisphosphate and inositol bisphosphate which, in the presence of lithium, resulted in an accumulation of inositol monophosphate. In addition, PAF induced a rapid efflux of 45Ca2+ from preloaded cells, an effect which was concentration-dependent. These data suggest that PAF mobilizes intracellular Ca2+ via the production of inositol trisphosphate.
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Doyle et al. (1986) studied this question.
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