Analysis of mammalian sphingolipids by liquid chromatography tandem mass spectrometry (LC-MS/MS) and tissue imaging mass spectrometry (TIMS)

MC Sullards, Y Liu, Y Chen, AH Merrill Jr - Biochimica et Biophysica Acta …, 2011 - Elsevier
MC Sullards, Y Liu, Y Chen, AH Merrill Jr
Biochimica et Biophysica Acta (BBA)-Molecular and Cell Biology of Lipids, 2011Elsevier
Sphingolipids are a highly diverse category of molecules that serve not only as components
of biological structures but also as regulators of numerous cell functions. Because so many
of the structural features of sphingolipids give rise to their biological activity, there is a need
for comprehensive or “sphingolipidomic” methods for identification and quantitation of as
many individual subspecies as possible. This review defines sphingolipids as a class, briefly
discusses classical methods for their analysis, and focuses primarily on liquid …
Sphingolipids are a highly diverse category of molecules that serve not only as components of biological structures but also as regulators of numerous cell functions. Because so many of the structural features of sphingolipids give rise to their biological activity, there is a need for comprehensive or “sphingolipidomic” methods for identification and quantitation of as many individual subspecies as possible. This review defines sphingolipids as a class, briefly discusses classical methods for their analysis, and focuses primarily on liquid chromatography tandem mass spectrometry (LC-MS/MS) and tissue imaging mass spectrometry (TIMS). Recently, a set of evolving and expanding methods have been developed and rigorously validated for the extraction, identification, separation, and quantitation of sphingolipids by LC-MS/MS. Quantitation of these biomolecules is made possible via the use of an internal standard cocktail. The compounds that can be readily analyzed are free long-chain (sphingoid) bases, sphingoid base 1-phosphates, and more complex species such as ceramides, ceramide 1-phosphates, sphingomyelins, mono- and di-hexosylceramides, sulfatides, and novel compounds such as the 1-deoxy- and 1-(deoxymethyl)-sphingoid bases and their N-acyl-derivatives. These methods can be altered slightly to separate and quantitate isomeric species such as glucosyl/galactosylceramide. Because these techniques require the extraction of sphingolipids from their native environment, any information regarding their localization in histological slices is lost. Therefore, this review also describes methods for TIMS. This technique has been shown to be a powerful tool to determine the localization of individual molecular species of sphingolipids directly from tissue slices. This article is part of a Special Issue entitled Lipodomics and Imaging Mass Spectrometry.
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