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• W1582592433 abstract "Sphingosine is a positive regulator of cell growth in Swiss 3T3 fibroblasts (Zhang, H., Buckley, N. E., Gibson, K., and Spiegel, S. (1990) J. Biol. Chem. 265, 76-81). The present study investigated the stereospecificity of sphingosine-induced cell proliferation and its mitogenic signal transduction mechanisms. D-(+)-erythro Stereoisomers (cis and trans) stimulated DNA synthesis, whereas neither L-(-)-threo-sphingosine (cis or trans) nor DL-threo-dihydrosphingosine had any effect. Previously, we have shown that sphingosine-1-phosphate may mediate the mitogenic effect of sphingosine (Zhang, H., Desai, N. N., Olivera, A., Seki, T., Brooker, G., and Spiegel, S. (1991) J. Cell Biol. 114, 155-167). However, no major differences were found in the formation of D-(+)-erythro- and L-(-)-threo- sphingosine-1-phosphate derived from the respective sphingosine isomers in intact cells. Thus, the stereospecificity of the response to sphingosine may reside at the level of specific intracellular targets for sphingosine-1-phosphate. Sphingosine-1-phosphate triggers dual signal transduction pathways of activation of phospholipase D leading to increases in the levels of phosphatidic acid and mobilization of calcium from internal stores. Both D-(+)-erythro- and L-(-)-threo-sphingosine isomers induced similar increases in phosphatidic acid concomitant with identical decreases in phosphatidylcholine levels. In contrast, only the D-(+)-erythro-stereoisomers (cis and trans) were effective in releasing calcium from intracellular stores. Our results suggest that the formation of phosphatidic acid is not sufficient to mediate sphingosine-stimulated DNA synthesis. However, the stereospecificity of the sphingosine-induced mobilization of calcium from internal stores seems to correlate with the induction of DNA synthesis by sphingosine stereoisomers." @default.
• W1582592433 created "2016-06-24" @default.
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• W1582592433 date "1994-07-01" @default.
• W1582592433 modified "2023-10-16" @default.
• W1582592433 title "Stereospecificity of sphingosine-induced intracellular calcium mobilization and cellular proliferation." @default.
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• W1582592433 doi "https://doi.org/10.1016/s0021-9258(17)32398-0" @default.
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