Abstract
Purpose
To investigate the concentration and composition of N-glycans in plasma and vitreous samples obtained from patients with non-proliferative vitreoretinal diseases.
Methods
Plasma 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.
Results
Concentration 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 %).
Conclusions
The 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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Acknowledgments
This work was supported by JSPS KAKENHI Grant Number 24659754, 26670749 and 25462745, the Charitable Trust Fund for Ophthalmic Research in Commemoration of Santen Pharmaceutical's Founder (KN and AK), and “Development of Systems and Technology for Advanced Measurement and Analysis” by JST-SENTAN. The authors wish to thank Ikuyo Hirose, Shiho Yoshida, Erdal Tan Ishizuka, and Kazue Okada for their skillful technical assistance in this project.
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The authors declare that they have no conflicts of interest.
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Inafuku, S., Noda, K., Amano, M. et al. A comparison of N-glycan profiles in human plasma and vitreous fluid. Graefes Arch Clin Exp Ophthalmol 252, 1235–1243 (2014). https://doi.org/10.1007/s00417-014-2671-x
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DOI: https://doi.org/10.1007/s00417-014-2671-x