Identification of a novel growth factor-like lipid, 1-O-cis-alk-1′-enyl-2-lyso-sn-glycero-3-phosphate (alkenyl-GP) that is present in commercial sphingolipid preparations

被引:42
作者
Liliom, K
Fischer, DJ
Virág, T
Sun, GP
Miller, DD
Tseng, JL
Desiderio, DM
Seidel, MC
Erickson, JR
Tigyi, G
机构
[1] Univ Tennessee, Coll Med, Dept Physiol & Biophys, Memphis, TN 38163 USA
[2] Univ Tennessee, Dept Pharmaceut Sci, Memphis, TN 38163 USA
[3] Univ Tennessee, Charles B Stout Neurosci Mass Spectrometry Lab, Memphis, TN 38163 USA
[4] Univ Tennessee, Dept Neurol, Memphis, TN 38163 USA
[5] Univ Tennessee, Dept Biochem, Memphis, TN 38163 USA
[6] Matreya Inc, Pleasant Gap, PA 16823 USA
[7] LXR Biotechnol Inc, Richmond, CA 94804 USA
[8] Hungarian Acad Sci, Biol Res Ctr, Inst Enzymol, H-1113 Budapest, Hungary
关键词
D O I
10.1074/jbc.273.22.13461
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Lysophosphatidic acid, a member of the acidic phospholipid autacoid (APA) family of lipid mediators, elicits diverse cellular effects that range from mitogenesis to the prevention of programmed cell death. Sphingosine 1-phosphate and sphingosylphosphorylcholine have also been proposed to be ligands of the APA receptors, However, key observations that provide the foundation of this hypothesis have not been universally reproducible, leading to a controversy in the field. We provide evidence that 1-O-cis-alk-1'-enyl-2-lyso-sn-glycero-3-phosphate (alkenyl-GP) is present in some commercial sphingolipid preparations and is responsible for many of their APA-like effects, which were previously attributed to sphingosylphosphorylcholine. Alkenyl-GP was generated by acidic and basic methanolysis from ethanolamine lysoplasmalogen, which was present in the sphingomyelin fraction that is used to manufacture sphingosylphosphorylcholine. We present the structural identification of alkenyl-GP, using H-1 and C-13 NMR, Fourier transform infrared spectrometry, and mass spectrometry. Alkenyl-GP was a potent activator of the mitogen-activated protein kinases ERK1/2 and elicited a mitogenic response in Swiss 3T3 fibroblasts. In contrast, sphingosylphosphorylcholine at a concentration of 10 mu M was only a weak mitogen and only weakly activated the extracellular signal-regulated protein kinases, Alkenyl-GP has recently been detected as an injury-induced component in the anterior chamber of the eye (Liliom, K., Guan, Z., Tseng, H., Desiderio, D. M., Tigyi, G., and Watsky, M. (1998) Am. J, Physiol. 274, C1065-C1074), indicating that this lipid is a naturally occurring member of the APA mediator family.
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收藏
页码:13461 / 13468
页数:8
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