Sphingosine-1-phosphate, a metabolite of sphingosine, increases phosphatidic acid levels by phospholipase D activation - PubMed (original) (raw)
. 1992 Nov 15;267(32):23122-8.
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- PMID: 1429659
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Sphingosine-1-phosphate, a metabolite of sphingosine, increases phosphatidic acid levels by phospholipase D activation
N N Desai et al. J Biol Chem. 1992.
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Abstract
Sphingosine and sphingosine-1-phosphate, metabolites of membrane sphingolipids, have recently been shown to stimulate release of calcium from internal sources and to increase proliferation of quiescent Swiss 3T3 fibroblasts (Zhang, H., Desai, N. N., Olivera, A., Seki, T., Brooker, G., and Spiegel, S. (1991) J. Cell Biol. 114, 155-167). The present study demonstrates that mitogenic concentrations of sphingosine induce early increases in sphingosine-1-phosphate levels which precede the increase in the potent mitogen, phosphatidic acid. Sphingosine-1-phosphate itself induces a more rapid increase in phosphatidic acid, thus suggesting that it may mediate the effects of sphingosine on phosphatidic acid accumulation. The concentration dependence for the formation of phosphatidic acid induced by sphingosine-1-phosphate correlates with its effect on DNA synthesis. Similar to sphingosine, sphingosine-1-phosphate also stimulates the activity of phospholipase D, although a significant effect is observed at a much lower concentration. However, in contrast to previous reports with sphingosine, sphingosine-1-phosphate does not inhibit the phosphatidic acid phosphohydrolase activity in cell homogenates. Thus, in addition to its effect on mobilization of calcium, sphingosine-1-phosphate can increase the level of phosphatidic acid, most likely via activation of phospholipase D. We suggest that sphingosine-1-phosphate mediates the effect of sphingosine on phosphatidic acid accumulation in Swiss 3T3 fibroblasts and may regulate cellular proliferation by affecting multiple transmembrane signaling pathways.
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