Linked Life Data

10683250

Source:http://linkedlifedata.com/resource/pubmed/id/10683250

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pubmed-article:10683250pubmed:abstractTextSphingosine-1-phosphate (SPP) acts as a first messenger in immortalized human airway epithelial cells (CFNPE9o(-)), possibly interacting with an Edg family receptor. Expression of the SPP receptors Edg-1 and Edg-3, as well as a low level of Edg-5/H218, was detected in these cells, in agreement with their ability to specifically bind SPP. The related lipids, lysophosphatidic acid and sphingosylphosphorylcholine, were unable to displace SPP from its high affinity binding sites, suggesting that the biological responses to these different lysolipids are mediated by distinct receptors. SPP markedly inhibited forskolin-stimulated cAMP accumulation in a dose-dependent manner and caused a remarkable elevation of intracellular calcium, both effects being sensitive to pertussis toxin treatment. Most importantly, SPP stimulated phosphatidic acid formation, which was maximal after 2 min and decreased within 8-10 min. In the presence of butan-1-ol, suppression of SPP-induced phosphatidic acid formation and production of phosphatidylbutanol were found, clearly indicating activation of phospholipase D (PLD). This finding was also confirmed by analysis of the fatty acid composition of phosphatidic acid, showing an increase in the monounsaturated oleic acid only. The decrease of phosphatidic acid level after 8-10 min incubation with SPP was accompanied by a parallel increase of diacylglycerol production, which was abolished in the presence of butan-1-ol. This result indicates that activation of phospholipase D is followed by stimulation of phosphatidate phosphohydrolase activity. Phosphatidic acid formation was insensitive to protein kinase C inhibitors and almost completely inhibited by pertussis toxin treatment, suggesting that SPP activates phospholipase D via a G(i/o) protein-coupled receptor.lld:pubmed
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pubmed-article:10683250pubmed:copyrightInfoCopyright 2000 Academic Press.lld:pubmed
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pubmed-article:10683250pubmed:articleTitleSphingosine-1-phosphate activates phospholipase D in human airway epithelial cells via a G protein-coupled receptor.lld:pubmed
pubmed-article:10683250pubmed:affiliationDipart. di Biologia Ev.Sp., Università di Bologna, Bologna, Italy.lld:pubmed
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pubmed-article:10683250pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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