4.8 Article

MALDI TIMS IMS of Disialoganglioside Isomers?GD1a and GD1b in Murine Brain Tissue

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ANALYTICAL CHEMISTRY
卷 95, 期 2, 页码 1176-1183

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AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.2c03939

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Gangliosides are diverse acidic glycosphingolipids with distinct biological roles. Matrix-assisted laser desorption/ionization imaging mass spectrometry (MALDI IMS) can be used for spatial analysis of gangliosides directly from tissue sections. The integration of trapped ion mobility spectrometry with MALDI IMS enables the analysis of isomeric lipid structures in situ. Gas-phase separation and identification of disialoganglioside isomers GD1a and GD1b, with different sialic acid residue positions, were demonstrated in multiple samples, including tissue sections.
Gangliosides are acidic glycosphingolipids, containing ceramide moieties and oligosaccharide chains with one or more sialic acid residue(s) and are highly diverse isomeric structures with distinct biological roles. Matrix-assisted laser desorption/ionization imaging mass spectrometry (MALDI IMS) enables the untargeted spatial analysis of gangliosides, among other biomolecules, directly from tissue sections. Integrating trapped ion mobility spectrometry with MALDI IMS allows for the analysis of isomeric lipid structures in situ. Here, we demonstrate the gas-phase separation and identification of disialoganglioside isomers GD1a and GD1b that differ in the position of a sialic acid residue, in multiple samples, including a standard mixture of both isomers, a biological extract, and directly from thin tissue sections. The unique spatial distributions of GD1a/b (d36:1) and GD1a/b (d38:1) isomers were determined in rat hippocampus and spinal cord tissue sections, demonstrating the ability to structurally characterize and spatially map gangliosides based on both the carbohydrate chain and ceramide moieties.

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