Structural elucidation and monokine-inducing activity of two biologically active zwitterionic glycosphingolipids derived from the porcine parasitic nematode Ascaris suum.

The Journal of Biological Chemistry
Günter LochnitRudolf Geyer

Abstract

The isolated neutral glycosphingolipid fraction from the pig parasitic nematode, Ascaris suum, was fractionated by silica gel chromatography to yield a neutral and a zwitterionic glycosphingolipid fraction, the latter of which mainly contained two zwitterionic glycosphingolipids termed components A and C. Preliminary chemical characterization with hydrofluoric acid treatment and immunochemical characterization with a phosphocholine-specific monoclonal antibody indicated that both components contained phosphodiester substitutions: phosphocholine for component A, and phosphocholine and phosphoethanolamine for component C. Both components were biologically active in inducing human peripheral blood mononuclear cells to release the inflammatory monokines tumor necrosis factor alpha, interleukin 1, and interleukin 6. Component A was the more bioactive molecule, and its biological activity was abolished on removal of the phosphocholine substituent by hydrofluoric acid. The glycosphingolipid components were structurally analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, liquid secondary ion mass spectrometry, methylation analysis, 1H NMR spectroscopy, exoglycosidase cleavage, and ceramide analysis...Continue Reading

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Citations

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