ArticleGraefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie2014
A comparison of N-glycan profiles in human plasma and vitreous fluid.
Article in Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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9 authors.
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Abstract
purposeTo investigate the concentration and composition of N-glycans in plasma and vitreous samples obtained from patients with non-proliferative vitreoretinal diseases.
methodsPlasma and vitreous samples were collected from 11 patients with idiopathic macular hole (MH) and 9 patients with epiretinal membrane (ERM). The samples were pretreated for enzymatic cleaving, and subsequently glycans released from proteins were captured on BlotGlyco H beads. Sialic acids were methyl-esterified. Processed glycans were tagged with aminooxy-functionalized peptide reagent (aoWR) and released from the beads, followed by detection by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). The concentration and composition of N-glycans in the samples were assessed.
resultsConcentration of N-glycans in vitreous samples (132 ± 29 pmol/100 μg protein) was significantly lower compared with those in plasma samples (714 ± 29 pmol/100 μg protein, p < 0.001). Predominant N-glycan in both plasma (39.7 ± 1.1 %) and vitreous fluid (37.2 ± 3.1 %) was identical, and the composition was presumed as [(Hex)2(HexNAc)2(NeuAc)2+ (Man)3(GlcNAc)2]. By contrast, the second-ranked N-glycan in vitreous samples (15.6 ± 1.5 %) was the seventh in plasma (2.3 ± 0.2 %).
conclusionsThe current data provide useful information on N-glycan profile in the vitreous fluid, which is distinct from that in the plasma.
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