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J Biol Chem, Vol. 273, Issue 22, 13461-13468, May 29, 1998

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

Károly Liliomab, David J. Fischera, Tamás Virága, Guoping Sune, Duane D. Millere, Jih-Lie Tsengf, Dominic M. Desideriofgh, Michael C. Seideli, James R. Ericksonj, and Gábor Tigyia

From the Departments of a Physiology and Biophysics, and e Pharmaceutical Science, the f Charles B. Stout Neuroscience Mass Spectrometry Laboratory, the Departments of g Neurology and h Biochemistry, the University of Tennessee, Memphis, Tennessee 38163, i Matreya Inc., Pleasant Gap, Pennsylvania 16823, j LXR Biotechnology Inc., Richmond, California 94804, and the b Institute of Enzymology, Biological Research Center of the Hungarian Academy of Sciences, Karolina Street 29, Budapest 1113, Hungary

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 1H and 13C 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 µM 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.

Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.


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