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Sphingosine 1-phosphate phosphatase 2 is induced during inflammatory responses.

Mechtcheriakova, Diana, Wlachos, Alexander, Sobanov, Jury, Kopp, Tamara, Reuschel, Roland, Bornancin, Frederic, Cai, Richard, Zemann, Barbara, Urtz, Nicole, Stingl, Georg, Zlabinger, Gerhard, Woisetschlaeger, Maximilian, Baumruker, Thomas and Billich, Andreas (2007) Sphingosine 1-phosphate phosphatase 2 is induced during inflammatory responses. Cellular Signalling, 19 (4). pp. 748-760. ISSN 0898-6568


Sphingosine 1-phosphate (S1P) levels in cells and, consequently, its bioactivity as a signalling molecule are controlled by the action of enzymes responsible for its synthesis and degradation. In the present report, we examined alterations in expression patterns of enzymes involved in S1P-metabolism (sphingosine kinases including their splice variants, sphingosine 1-phosphate phosphatases, and sphingosine 1-phosphate lyase) under certain inflammatory conditions. We found that sphingosine kinase type 1 (SPHK1) mRNA could be triggered in a cell type-specific manner; individual SPHK1 splice variants were induced with similar kinetics. Remarkably, expression and activity of S1P phosphatase 2 (SPP2) was found to be highly upregulated by inflammatory stimuli in a variety of cells (e.g., neutrophils, endothelial cells). Bandshift analysis using oligonucleotides spanning predicted NFkappaB sites within the SPP2 promoter and silencing of NFkappaB/RelA via RelA-directed siRNA demonstrated that SPP2 is an NFkappaB-dependent gene. Silencing of SPP2 expression in endothelial cells, in turn, led to a marked reduction of TNF-alpha-induced IL-1beta mRNA and protein and to a partial reduction of induced IL-8, suggesting a pro-inflammatory role of SPP2. Notably, up-regulation of SPP2 was detected in samples of lesional skin of patients with psoriasis, an inflammatory skin disease. This study provides detailed insights into the regulation of SPP2 gene expression and suggests that SPP2 might be a novel player in pro-inflammatory signalling.

Item Type: Article
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Additional Information: author can archive post-print (ie final draft post-refereeing); Publisher's version/PDF cannot be used
Keywords: Sphingolipids; Sphingosine kinase; Sphingosine 1-phosphate phosphatase; Transcriptional regulation; Inflammation; NFkappaB
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Date Deposited: 14 Dec 2009 13:57
Last Modified: 31 Jan 2013 01:13


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