Li Y, Teneberg S, Thapa P, Bendelac A, Levery SB, Zhou D. Sensitive detection of isoglobo and globo series tetraglycosylceramides in human thymus by ion trap mass spectrometry.
Glycobiology 2007;
18:158-65. [PMID:
18056651 DOI:
10.1093/glycob/cwm129]
[Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Glycosphingolipids serve as ligands for receptors involved in signal transduction and immune recognition, as exemplified by isoglobotrihexosylceramide, an antigenic ligand for T cell receptors. Mechanistic studies on the regulation of isoglobotrihexosylceramide require biochemical measurement of its lysosomal precursor, isoglobotetraglycosylceramide. It remains a challenge to distinguish between complex tetraglycosylceramide glycosphingolipid isomers with the same sugar components but diverse internal linkages. Here we established a simple and sensitive method to separate globo- and isoglobotetraglycosylceramide by MS5 ion trap mass spectrometry, and report the identification of isoglobotetraglycosylceramide in a CHO cell line transfected by iGb3 synthase, as well as in human thymus.
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