title: Analysis of neutral glycosphingolipids from Trypanosoma brucei.
abstract: Neutral glycosphingolipids (GSLs) were isolated from Trypanosoma brucei and analyzed by thin-layer chromatography (TLC), TLC/secondary ion mass spectrometry (TLC/SIMS), and liposome immune lysis assay (LILA). Three species of neutral GSLs, designated as N-1, -2, and -3 were separated on TLC. N-1 GSL migrated very close to glucosylceramide (GlcCer) and N-2 GSL showed the same mobility as lactosylceramide (LacCer). On the other hand, the mobility of N-3 GSL on the TLC plate was slower than globotetraosylceramide (Gb4). In order to characterize the molecular species of neutral GSLs from T. brucei, N-1, -2 and -3 GSLs were analyzed by TLC/SIMS. The TLC/SIMS analysis of N-1 of the parasites revealed a series of (M-H)- ions from m/z 698 to 825 representing the molecular mass range of ceramide monohexoside (CMH) (GlcCer or galactosylceramide). On the other hand, the TLC/SIMS spectra of N-2 GSL revealed a series of (M-H)- ions from m/z 944-987 indicating the molecular mass range of LacCer. In the TLC/SIMS analysis of N-3 GSL, however, the characteristic molecular ions that can elucidate the structure of N-3 GSL were not obtained. In order to confirm the results obtained from TLC/SIMS, N-1, -2, and -3, GSLs were tested by LILA with specific antibodies against GlcCer, LacCer, and Gb4, respectively. N-1 GSL had reactivity to anti-GlcCer antibody and N-2 GSL reacted with the antibody against LacCer. However, N-3 GSL was not recognized by anti-Gb4 antibody. Using anti-GlcCer and anti-LacCer antibodies, furthermore, we studied the expression of GlcCer and LacCer in T. brucei parasites. Both GlcCer and LacCer were detected on the cell surface of T. brucei.
authors.affiliation: Laboratory of Veterinary Immunology, Division of Veterinary Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.
authors.forename: Akiko
authors.initials: A
authors.lastname: Uemura
authors.forename: Shinobu
authors.initials: S
authors.lastname: Watarai
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Kushi
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kasama
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Ohnishi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kodama
mesh_terms: D000818:Animals; D002855:Chromatography, Thin Layer / Q000379:methods / Q000662:veterinary; D006028:Glycosphingolipids / Q000032:analysis* / Q000302:isolation & purification; D007106:Immune Sera / Q000276:immunology; D008970:Molecular Weight; D020383:Neutral Glycosphingolipids / Q000032:analysis / Q000302:isolation & purification; D018629:Spectrometry, Mass, Secondary Ion / Q000379:methods / Q000662:veterinary; D014346:Trypanosoma brucei brucei / Q000737:chemistry* / Q000276:immunology*
chemical_list: D006028:Glycosphingolipids; D007106:Immune Sera; D020383:Neutral Glycosphingolipids