Determination of ganglioside composition and structure in human brain hemangioma by chip-based nanoelectrospray ionization tandem mass spectrometry
| Autor: | Svjetlana Kalanj-Bognar, Alina Serb, Corina Flangea, Eugen Sisu, Zeljka Vukelic, Catalin Schiopu, Michael Przybylski, Florina Capitan, Alina D. Zamfir |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Adult
Male Spectrometry Mass Electrospray Ionization Glycan Tandem mass spectrometry Brain hemangioma Mass spectrometry Brain tumor biomarker Biochemistry Analytical Chemistry chemistry.chemical_compound Isomerism Tandem Mass Spectrometry Gangliosides Biomarkers Tumor Humans Nanotechnology Brain Hemangioma Cerebral Cortex Chromatography Ganglioside biology Brain Neoplasms Chemistry Brain Chip-based nanoelectrospray N-Acetylneuraminic Acid Frontal Lobe Sialic acid Case-Control Studies ddc:540 biology.protein Ion trap Hemangioma ganglioside composition hemangioma brain mass spectrometry automated chip-nanoelectrospray (nanoESI) high-capacity ion trap (HCT) and collision-induced dissociation (CID) N-Acetylneuraminic acid |
| Popis: | We report here on a preliminary investigation of ganglioside composition and structure in human hemangioma, a benign tumor in the frontal cortex (HFC) in comparison to normal frontal cortex (NFC) tissue using for the first time advanced mass spectrometric methods based on fully automated chip-nanoelectrospray (nanoESI) high-capacity ion trap (HCT) and collision-induced dissociation (CID). The high ionization efficiency, sensitivity and reproducibility provided by the chip-nanoESI approach allowed for a reliable MS-based ganglioside comparative assay. Unlike NFC, ganglioside mixture extracted from HFC was found dominated by species of short glycan chains exhibiting lower overall sialic acid content. In HFC, only GT1 (d18:1/20:0), and GT3 (d18:1/25:1) polysialylated species were detected. Interestingly, none of these trisialylated forms was detected in NFC, suggesting that such components might selectively be associated with HFC. Unlike the case of previously investigated high malignancy gliosarcoma, in HFC one modified O-Ac-GD2 and one modified O-Ac-GM4 gangliosides were observed. This aspect suggests that these O-acetylated structures could be associated with cerebral tumors having reduced malignancy grade. Fragmentation analysis by CID in MS(2) mode using as precursors the ions corresponding to GT1 (d18:1/20:0) and GD1 (d18:1/20:0) provided data corroborating for the first time the presence of the common GT1a and GT1b isomers and the incidence of unusual GT1c and GT1d glycoforms in brain hemangioma tumor. |
| Databáze: | OpenAIRE |
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