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Sphingosine 1-phosphate lyase deficiency disrupts lipid homeostasis in liver.
J Biol Chem 2010; 285(14):10880-9JB

Abstract

The cleavage of sphingoid base phosphates by sphingosine-1-phosphate (S1P) lyase to produce phosphoethanolamine and a fatty aldehyde is the final degradative step in the sphingolipid metabolic pathway. We have studied mice with an inactive S1P lyase gene and have found that, in addition to the expected increase of sphingoid base phosphates, other sphingolipids (including sphingosine, ceramide, and sphingomyelin) were substantially elevated in the serum and/or liver of these mice. This latter increase is consistent with a reutilization of the sphingosine backbone for sphingolipid synthesis due to its inability to exit the sphingolipid metabolic pathway. Furthermore, the S1P lyase deficiency resulted in changes in the levels of serum and liver lipids not directly within the sphingolipid pathway, including phospholipids, triacyglycerol, diacylglycerol, and cholesterol. Even though lipids in serum and lipid storage were elevated in liver, adiposity was reduced in the S1P lyase-deficient mice. Microarray analysis of lipid metabolism genes in liver showed that the S1P lyase deficiency caused widespread changes in their expression pattern, with a significant increase in the expression of PPARgamma, a master transcriptional regulator of lipid metabolism. However, the mRNA expression of the genes encoding the sphingosine kinases and S1P phosphatases, which directly control the levels of S1P, were not significantly changed in liver of the S1P lyase-deficient mice. These results demonstrate that S1P lyase is a key regulator of the levels of multiple sphingolipid substrates and reveal functional links between the sphingolipid metabolic pathway and other lipid metabolic pathways that may be mediated by shared lipid substrates and changes in gene expression programs. The disturbance of lipid homeostasis by altered sphingolipid levels may be relevant to metabolic diseases.

Authors+Show Affiliations

Genetics of Development and Disease Branch, NHLBI, National Institutes of Health, Bethesda, Maryland 20892, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural
Research Support, N.I.H., Intramural

Language

eng

PubMed ID

20097939

Citation

Bektas, Meryem, et al. "Sphingosine 1-phosphate Lyase Deficiency Disrupts Lipid Homeostasis in Liver." The Journal of Biological Chemistry, vol. 285, no. 14, 2010, pp. 10880-9.
Bektas M, Allende ML, Lee BG, et al. Sphingosine 1-phosphate lyase deficiency disrupts lipid homeostasis in liver. J Biol Chem. 2010;285(14):10880-9.
Bektas, M., Allende, M. L., Lee, B. G., Chen, W., Amar, M. J., Remaley, A. T., ... Proia, R. L. (2010). Sphingosine 1-phosphate lyase deficiency disrupts lipid homeostasis in liver. The Journal of Biological Chemistry, 285(14), pp. 10880-9. doi:10.1074/jbc.M109.081489.
Bektas M, et al. Sphingosine 1-phosphate Lyase Deficiency Disrupts Lipid Homeostasis in Liver. J Biol Chem. 2010 Apr 2;285(14):10880-9. PubMed PMID: 20097939.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sphingosine 1-phosphate lyase deficiency disrupts lipid homeostasis in liver. AU - Bektas,Meryem, AU - Allende,Maria Laura, AU - Lee,Bridgin G, AU - Chen,Weiping, AU - Amar,Marcelo J, AU - Remaley,Alan T, AU - Saba,Julie D, AU - Proia,Richard L, Y1 - 2010/01/24/ PY - 2010/1/26/entrez PY - 2010/1/26/pubmed PY - 2010/5/15/medline SP - 10880 EP - 9 JF - The Journal of biological chemistry JO - J. Biol. Chem. VL - 285 IS - 14 N2 - The cleavage of sphingoid base phosphates by sphingosine-1-phosphate (S1P) lyase to produce phosphoethanolamine and a fatty aldehyde is the final degradative step in the sphingolipid metabolic pathway. We have studied mice with an inactive S1P lyase gene and have found that, in addition to the expected increase of sphingoid base phosphates, other sphingolipids (including sphingosine, ceramide, and sphingomyelin) were substantially elevated in the serum and/or liver of these mice. This latter increase is consistent with a reutilization of the sphingosine backbone for sphingolipid synthesis due to its inability to exit the sphingolipid metabolic pathway. Furthermore, the S1P lyase deficiency resulted in changes in the levels of serum and liver lipids not directly within the sphingolipid pathway, including phospholipids, triacyglycerol, diacylglycerol, and cholesterol. Even though lipids in serum and lipid storage were elevated in liver, adiposity was reduced in the S1P lyase-deficient mice. Microarray analysis of lipid metabolism genes in liver showed that the S1P lyase deficiency caused widespread changes in their expression pattern, with a significant increase in the expression of PPARgamma, a master transcriptional regulator of lipid metabolism. However, the mRNA expression of the genes encoding the sphingosine kinases and S1P phosphatases, which directly control the levels of S1P, were not significantly changed in liver of the S1P lyase-deficient mice. These results demonstrate that S1P lyase is a key regulator of the levels of multiple sphingolipid substrates and reveal functional links between the sphingolipid metabolic pathway and other lipid metabolic pathways that may be mediated by shared lipid substrates and changes in gene expression programs. The disturbance of lipid homeostasis by altered sphingolipid levels may be relevant to metabolic diseases. SN - 1083-351X UR - https://www.unboundmedicine.com/medline/citation/20097939/Sphingosine_1_phosphate_lyase_deficiency_disrupts_lipid_homeostasis_in_liver_ L2 - http://www.jbc.org/cgi/pmidlookup?view=long&pmid=20097939 DB - PRIME DP - Unbound Medicine ER -