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Sphingosine (d16:1) is an atypical sphingolipid formed by a series of enzymatic steps beginning with the condensation of myristoyl-CoA and serine via serine palmitoyltransferase long-chain base subunit 3 (SPTLC3), an SPT subunit that prefers myristoyl-CoA over palmitoyl-CoA.1,2 Sphingosine d16:1 is present in its free form at low levels in human plasma and as the sphingoid base in a variety of plasma sphingolipid species, including sphingosine-1-phosphate, ceramides, and sphingomyelins, as well as brain cerebrosides, at lower levels compared with the typical d18:1 (Item No. 10007907) sphingoid base.3,4,5,6 Sphingosine (d16:1) inhibits PKC in a mixed micelle activity assay.7 It reduces the production of superoxide induced by phorbol 12-myristate 13-acetate (PMA; Item No. 10008014) in isolated human neutrophils and reduces the growth of CHO cells (IC50s = 1 and 3.2 µM, respectively). Plasma levels of sphingolipids containing sphingosine (d16:1) are associated with dietary intake of saturated fatty acids and protein in ethnic Chinese individuals.3 Plasma levels of sphingolipids containing sphingosine (d16:1) are decreased in patients with type 2 diabetes.8
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1. The SPTLC3 subunit of serine palmitoyltransferase generates short chain sphingoid bases. The Journal of Biological Chemisty 284(39), 26322-26330 (2009).
2. Biological effects of naturally occurring sphingolipids, uncommon variants, and their analogs. Neuromolecular Med. 18(3), 396-414 (2016).
3. Dietary fat and protein intake in relation to plasma sphingolipids as determined by a large-
4. Sphingolipid profiling of human plasma and FPLC-
5. Lipidomics reveals a remarkable diversity of lipids in human plasma. J. Lipid Res. 51(11), 3299-3305 (2010).
6. Sphingolipid long chain bases. Lipids 5(11), 878-891 (1970).
7. Structural requirements for long-
8. Plasma deoxysphingolipids: a novel class of biomarkers for the metabolic syndrome? Diabetologia 55(2), 421-431 (2012).